aboutsummaryrefslogtreecommitdiff
path: root/src/interp/i-syscmd.boot
blob: c738fda37bb803d4810810dfec960c6f9aa48818 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
-- Copyright (c) 1991-2002, The Numerical ALgorithms Group Ltd.
-- All rights reserved.
-- Copyright (C) 2007-2008, Gabriel Dos Reis.
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions are
-- met:
--
--     - Redistributions of source code must retain the above copyright
--       notice, this list of conditions and the following disclaimer.
--
--     - Redistributions in binary form must reproduce the above copyright
--       notice, this list of conditions and the following disclaimer in
--       the documentation and/or other materials provided with the
--       distribution.
--
--     - Neither the name of The Numerical ALgorithms Group Ltd. nor the
--       names of its contributors may be used to endorse or promote products
--       derived from this software without specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-- IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
-- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
-- OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


import '"i-object"
)package "BOOT"

--% Utility Variable Initializations

$cacheAlist := nil
$compileRecurrence := true
$errorReportLevel := 'warning
$sourceFileTypes := '(INPUT SPAD BOOT LISP LISP370 META)

$existingFiles := MAKE_-HASHTABLE "UEQUAL"

$SYSCOMMANDS := [CAR x for x in $systemCommands]

UNDERBAR == '"__"

$NonNullStream ==
  '"NonNullStream"

$NullStream ==
  '"NullStream"

$whatOptions := '( _
    operations _
    categories _
    domains _
    packages _
    commands _
    synonyms _
    things _
    )

$clearOptions := '( _
  modes _
  operations _
  properties _
  types _
  values  _
  )

$displayOptions := '( _
  abbreviations _
  all _
  macros _
  modes _
  names _
  operations  _
  properties _
  types _
  values _
  )

$countAssoc := '( (cache countCache) )

$localExposureDataDefault :=
  VECTOR(["basic", "categories"], [], [])

$localExposureData := 
  COPY_-SEQ $localExposureDataDefault


--% Top level system command

$options := nil

initializeSystemCommands() ==
  l := $systemCommands
  $SYSCOMMANDS := NIL
  while l repeat
    $SYSCOMMANDS := CONS(CAAR l, $SYSCOMMANDS)
    l := CDR l
  $SYSCOMMANDS := NREVERSE $SYSCOMMANDS

systemCommand [[op,:argl],:options] ==
  $options: local:= options
  $e:local := $CategoryFrame
  fun := selectOptionLC(op,$SYSCOMMANDS,'commandError)
  argl and (argl.0 = '_?) and fun ^= 'synonym =>
    helpSpad2Cmd [fun]
  fun := selectOption(fun,commandsForUserLevel $systemCommands,
    'commandUserLevelError)
  FUNCALL(fun, argl)

commandsForUserLevel l == --[a for [a,:b] in l | satisfiesUserLevel(a)]
  c := nil
  for [a,:b] in l repeat
    satisfiesUserLevel b => c := [a,:c]
  reverse c

synonymsForUserLevel l ==
  -- l is a list of synonyms, and this returns a sublist of applicable
  -- synonyms at the current user level.
  $UserLevel = 'development => l
  nl := NIL
  for syn in reverse l repeat
    cmd := STRING2ID_-N(CDR syn,1)
    null selectOptionLC(cmd,commandsForUserLevel
      $systemCommands,NIL) => nil
    nl := [syn,:nl]
  nl

satisfiesUserLevel x ==
  x          = 'interpreter => true
  $UserLevel = 'interpreter => false
  x          = 'compiler    => true
  $UserLevel = 'compiler    => false
  true

unAbbreviateKeyword x ==
  x' :=selectOptionLC(x,$SYSCOMMANDS,'commandErrorIfAmbiguous)
  if not x' then
    x' := 'system
    SETQ(LINE, CONCAT('")system ", SUBSTRING(LINE, 1, #LINE-1)))
    $currentLine := LINE
  selectOption(x',commandsForUserLevel $systemCommands,
    'commandUserLevelError)

hasOption(al,opt) ==
  optPname:= PNAME opt
  found := NIL
  for pair in al while not found repeat
    stringPrefix?(PNAME CAR pair,optPname) => found := pair
  found

selectOptionLC(x,l,errorFunction) ==
  selectOption(DOWNCASE object2Identifier x,l,errorFunction)

selectOption(x,l,errorFunction) ==
  member(x,l) => x                   --exact spellings are always OK
  null IDENTP x =>
    errorFunction => FUNCALL(errorFunction,x,u)
    nil
  u := [y for y in l | stringPrefix?(PNAME x,PNAME y)]
  u is [y] => y
  errorFunction => FUNCALL(errorFunction,x,u)
  nil

terminateSystemCommand() == TERSYSCOMMAND()

commandUserLevelError(x,u) == userLevelErrorMessage("command",x,u)

optionUserLevelError(x,u) == userLevelErrorMessage("option",x,u)

userLevelErrorMessage(kind,x,u) ==
  null u =>
    sayKeyedMsg("S2IZ0007",[$UserLevel,kind])
    terminateSystemCommand()
  commandAmbiguityError(kind,x,u)

commandError(x,u) == commandErrorMessage("command",x,u)

optionError(x,u) == commandErrorMessage("option",x,u)

commandErrorIfAmbiguous(x, u) ==
  null u => nil
  SETQ($OLDLINE, LINE)
  commandAmbiguityError("command", x, u)

commandErrorMessage(kind,x,u) ==
  SETQ ($OLDLINE,LINE)
  null u =>
    sayKeyedMsg("S2IZ0008",[kind,x])
    terminateSystemCommand()
  commandAmbiguityError(kind,x,u)

commandAmbiguityError(kind,x,u) ==
  sayKeyedMsg("S2IZ0009",[kind,x])
  for a in u repeat sayMSG ['"     ",:bright a]
  terminateSystemCommand()

--% Utility for access to original command line

getSystemCommandLine() ==
  p := STRPOS('")",$currentLine,0,NIL)
  line := if p then SUBSTRING($currentLine,p,NIL) else $currentLine
  maxIndex:= MAXINDEX line
  for i in 0..maxIndex while (line.i^=" ") repeat index:= i
  if index=maxIndex then line := '""
  else line := SUBSTRING(line,index+2,nil)
  line

------------ start of commands ------------------------------------------

--% )abbreviations

abbreviations l == abbreviationsSpad2Cmd l

abbreviationsSpad2Cmd l ==
  null l => helpSpad2Cmd '(abbreviations)
  abopts := '(query domain category package remove)

  quiet := nil
  for [opt] in $options repeat
    opt := selectOptionLC(opt,'(quiet),'optionError)
    opt = 'quiet => quiet := true

  l is [opt,:al] =>
    key := opOf CAR al
    type := selectOptionLC(opt,abopts,'optionError)
    type is 'query =>
      null al => listConstructorAbbreviations()
      constructor := abbreviation?(key) => abbQuery(constructor)
      abbQuery(key)
    type is 'remove =>
      DELDATABASE(key,'ABBREVIATION)
    ODDP SIZE al => sayKeyedMsg("S2IZ0002",[type])
    repeat
      null al => return 'fromLoop
      [a,b,:al] := al
      mkUserConstructorAbbreviation(b,a,type)
      SETDATABASE(b,'ABBREVIATION,a)
      SETDATABASE(b,'CONSTRUCTORKIND,type)
    null quiet =>
      sayKeyedMsg("S2IZ0001",[a,type,opOf b])
      nil
  nil

listConstructorAbbreviations() ==
  x := UPCASE queryUserKeyedMsg("S2IZ0056",NIL)
  MEMQ(STRING2ID_-N(x,1),'(Y YES)) =>
    whatSpad2Cmd '(categories)
    whatSpad2Cmd '(domains)
    whatSpad2Cmd '(packages)
  sayKeyedMsg("S2IZ0057",NIL)

--% )cd

cd args ==
  dir := TRUENAME STRING(car args or '"")
)if %hasFeature KEYWORD::SBCL
  SB_-POSIX::CHDIR NAMESTRING dir
)elseif %hasFeature KEYWORD::GCL
  SYSTEM::CHDIR NAMESTRING dir
)else
  internalError '"don't know how to chdir in this Lisp"
)endif
  SETF(_*DEFAULT_-PATHNAME_-DEFAULTS_*, ensureTrailingSlash NAMESTRING dir)
  sayKeyedMsg("S2IZ0070", [NAMESTRING _*DEFAULT_-PATHNAME_-DEFAULTS_*]) 


--% )clear

clear l == clearSpad2Cmd l

clearSpad2Cmd l ==
  -- new version which changes the environment and updates history
  $clearExcept: local := nil
  if $options then $clearExcept :=
    "and"/[selectOptionLC(opt,'(except),'optionError) =
             'except for [opt,:.] in $options]
  null l =>
    optList:= "append"/[['%l,'"       ",x] for x in $clearOptions]
    sayKeyedMsg("S2IZ0010",[optList])
  arg := selectOptionLC(first l,'(all completely scaches),NIL)
  arg = 'all          => clearCmdAll()
  arg = 'completely   => clearCmdCompletely()
  arg = 'scaches      => clearCmdSortedCaches()
  $clearExcept => clearCmdExcept(l)
  clearCmdParts(l)
  updateCurrentInterpreterFrame()

clearCmdSortedCaches() ==
  $lookupDefaults: local := false
  for [.,.,:domain] in HGET($ConstructorCache,'SortedCache) repeat
    pair := compiledLookupCheck('clearCache,[$Void],domain)
    SPADCALL pair

clearCmdCompletely() ==
  clearCmdAll()
  $localExposureData := COPY_-SEQ $localExposureDataDefault
  -- $functionTable := NIL
  sayKeyedMsg("S2IZ0013",NIL)
  clearClams()
  clearConstructorCaches()
  $existingFiles := MAKE_-HASHTABLE 'UEQUAL
  sayKeyedMsg("S2IZ0014",NIL)
  RECLAIM()
  sayKeyedMsg("S2IZ0015",NIL)
  NIL

clearCmdAll() ==
  clearCmdSortedCaches()
  ------undo special variables------
  $frameRecord := nil
  $previousBindings := nil
  $variableNumberAlist := nil
  untraceMapSubNames _/TRACENAMES
  $InteractiveFrame := LIST LIST NIL
  resetInCoreHist()
  if $useInternalHistoryTable
    then $internalHistoryTable := NIL
    else deleteFile histFileName()
  $IOindex := 1
  updateCurrentInterpreterFrame()
  $currentLine := '")clear all"    --restored 3/94; needed for undo (RDJ)
  clearMacroTable()
  if $frameMessages then sayKeyedMsg("S2IZ0011",[$interpreterFrameName])
  else sayKeyedMsg("S2IZ0012",NIL)

clearCmdExcept(l is [opt,:vl]) ==
  --clears elements of vl of all options EXCEPT opt
  for option in $clearOptions |
    ^stringPrefix?(object2String opt,object2String option)
      repeat clearCmdParts [option,:vl]

clearCmdParts(l is [opt,:vl]) ==
  -- clears the bindings indicated by opt of all variables in vl

  option:= selectOptionLC(opt,$clearOptions,'optionError)
  option:= INTERN PNAME option

  -- the option can be plural but the key in the alist is sometimes
  -- singular

  option :=
    option = 'types =>  'mode
    option = 'modes =>  'mode
    option = 'values => 'value
    option

  null vl => sayKeyedMsg("S2IZ0055",NIL)
  pmacs := getParserMacroNames()
  imacs := getInterpMacroNames()
  if vl='(all) then
    vl := ASSOCLEFT CAAR $InteractiveFrame
    vl := REMDUP(append(vl, pmacs))
  $e : local := $InteractiveFrame
  for x in vl repeat
    clearDependencies(x,true)
    if option='properties and x in pmacs then clearParserMacro(x)
    if option='properties and x in imacs and ^(x in pmacs) then
        sayMessage ['"   You cannot clear the definition of the system-defined macro ",
            fixObjectForPrinting x,"."]
    p1 := assoc(x,CAAR $InteractiveFrame) =>
      option='properties =>
        if isMap x then
          (lm := get(x,'localModemap,$InteractiveFrame)) =>
            PAIRP lm => untraceMapSubNames [CADAR lm]
          NIL
        for p2 in CDR p1 repeat
          prop:= CAR p2
          recordOldValue(x,prop,CDR p2)
          recordNewValue(x,prop,NIL)
        SETF(CAAR $InteractiveFrame,deleteAssoc(x,CAAR $InteractiveFrame))
      p2:= assoc(option,CDR p1) =>
        recordOldValue(x,option,CDR p2)
        recordNewValue(x,option,NIL)
        RPLACD(p2,NIL)
  nil

--% )close

queryClients () ==
  -- Returns the number of active scratchpad clients
  sockSendInt($SessionManager, $QueryClients)
  sockGetInt $SessionManager


close args ==
  $saturn => 
    sayErrorly('"Obsolete system command", _
      ['" The )close  system command is obsolete in this version of AXIOM.",
       '" Please use Close from the File menu instead."])
  quiet:local:= false
  null $SpadServer =>
    throwKeyedMsg('"S2IZ0071", [])
  numClients := queryClients()
  numClients > 1 =>
    sockSendInt($SessionManager, $CloseClient)
    sockSendInt($SessionManager, $currentFrameNum)
    closeInterpreterFrame(NIL)
  for [opt,:.] in $options repeat
    fullopt := selectOptionLC(opt, '(quiet), 'optionError)
    fullopt = 'quiet   =>
           quiet:=true
  quiet =>
    sockSendInt($SessionManager, $CloseClient)
    sockSendInt($SessionManager, $currentFrameNum)
    closeInterpreterFrame(NIL)
  x := UPCASE queryUserKeyedMsg('"S2IZ0072", nil)
  MEMQ(STRING2ID_-N(x,1), '(YES Y)) =>
    BYE()
  nil

--% )constructor

constructor args ==
  sayMessage '"   Not implemented yet."
  NIL

--% )compiler

compiler args ==
    $newConlist: local := nil    --reset by compDefineLisplib and astran
    null args and null $options and null _/EDITFILE => helpSpad2Cmd '(compiler)
    if null args then args := [_/EDITFILE]

    -- first see if the user has explicitly specified the compiler
    -- to use.

    optlist := '(new old translate constructor)
    haveNew := nil
    haveOld := nil
    for opt in $options while ^(haveNew and haveOld) repeat
        [optname,:optargs] := opt
        fullopt := selectOptionLC(optname,optlist,nil)
        fullopt = 'new => haveNew := true
        fullopt = 'translate => haveOld := true
        fullopt = 'constructor => haveOld := true
        fullopt = 'old => haveOld := true

    haveNew and haveOld => throwKeyedMsg("S2IZ0081", nil)

    af  := pathname args
    aft := pathnameType af
-- Whats this for? MCD/PAB 21-9-95
--    if haveNew and (null(aft) or (aft = '"")) then
--        af := pathname [af, '"as"]
--        aft = '"as"
--    if haveOld and (null(aft) or (aft = '"")) then
--        af := pathname [af, '"spad"]
--        aft = '"spad"

    haveNew or (aft = '"as")   =>
        not (af1 := $FINDFILE (af, '(as))) =>
            throwKeyedMsg("S2IL0003",[NAMESTRING af])
        compileAsharpCmd [af1]
    haveOld or (aft = '"spad") =>
        not (af1 := $FINDFILE (af, '(spad))) =>
            throwKeyedMsg("S2IL0003",[NAMESTRING af])
        compileSpad2Cmd  [af1]
    aft = '"lsp"   =>
        not (af1 := $FINDFILE (af, '(lsp))) =>
            throwKeyedMsg("S2IL0003",[NAMESTRING af])
        compileAsharpLispCmd [af1]
    aft = '"NRLIB"  =>
        not (af1 := $FINDFILE (af, '(NRLIB))) =>
            throwKeyedMsg("S2IL0003",[NAMESTRING af])
        compileSpadLispCmd [af1]
    aft = '"ao"   =>
        not (af1 := $FINDFILE (af, '(ao))) =>
            throwKeyedMsg("S2IL0003",[NAMESTRING af])
        compileAsharpCmd [af1]
    aft = '"al"   =>    -- archive library of .ao files
        not (af1 := $FINDFILE (af, '(al))) =>
            throwKeyedMsg("S2IL0003",[NAMESTRING af])
        compileAsharpArchiveCmd [af1]

    -- see if we something with the appropriate file extension
    -- lying around

    af1 := $FINDFILE (af, '(as spad ao asy))

    af1 and pathnameType(af1) = '"as"   => compileAsharpCmd [af1]
    af1 and pathnameType(af1) = '"ao"  => compileAsharpCmd [af1]
    af1 and pathnameType(af1) = '"spad" => compileSpad2Cmd  [af1]
    af1 and pathnameType(af1) = '"asy"  => compileAsharpArchiveCmd [af1]

    -- maybe /EDITFILE has some stuff that can help us
    ef := pathname _/EDITFILE
    ef := mergePathnames(af,ef)

    ef = af => throwKeyedMsg("S2IZ0039", nil)
    af := ef

    pathnameType(af) = '"as"   => compileAsharpCmd args
    pathnameType(af) = '"ao"  => compileAsharpCmd args
    pathnameType(af) = '"spad" => compileSpad2Cmd  args

    -- see if we something with the appropriate file extension
    -- lying around
    af1 := $FINDFILE (af, '(as spad ao asy))

    af1 and pathnameType(af1) = '"as"   => compileAsharpCmd [af1]
    af1 and pathnameType(af1) = '"ao"  => compileAsharpCmd [af1]
    af1 and pathnameType(af1) = '"spad" => compileSpad2Cmd  [af1]
    af1 and pathnameType(af1) = '"asy"  => compileAsharpArchiveCmd [af1]

    throwKeyedMsg("S2IZ0039", nil)

compileAsharpCmd args ==
    compileAsharpCmd1 args
    terminateSystemCommand()
    spadPrompt()

compileAsharpCmd1 args ==
    -- Assume we entered from the "compiler" function, so args ^= nil
    -- and is a file with file extension .as or .ao

    path := pathname args
    pathType := pathnameType path
    (pathType ^= '"as") and (pathType ^= '"ao") => throwKeyedMsg("S2IZ0083", nil)
    ^PROBE_-FILE path => throwKeyedMsg("S2IL0003",[namestring args])

    SETQ(_/EDITFILE, path)
    updateSourceFiles path

    optList :=  '( _
      new _
      old _
      translate _
      onlyargs _
      moreargs _
      quiet _
      nolispcompile _
      noquiet _
      library _
      nolibrary _
        )

    beQuiet := false         -- be verbose here
    doLibrary  := true       -- so a )library after compilation
    doCompileLisp := true    -- do compile generated lisp code

    moreArgs := NIL
    onlyArgs := NIL

    for opt in $options repeat
        [optname,:optargs] := opt
        fullopt := selectOptionLC(optname,optList,nil)

        fullopt = 'new       => nil
        fullopt = 'old       => error "Internal error: compileAsharpCmd got )old"
        fullopt = 'translate => error "Internal error: compileAsharpCmd got )translate"

        fullopt = 'quiet     => beQuiet := true
        fullopt = 'noquiet   => beQuiet := false

        fullopt = 'nolispcompile   => doCompileLisp := false

        fullopt = 'moreargs  => moreArgs := optargs
        fullopt = 'onlyargs  => onlyArgs := optargs

        fullopt = 'library   => doLibrary  := true
        fullopt = 'nolibrary => doLibrary  := false

        throwKeyedMsg("S2IZ0036",[STRCONC('")",object2String optname)])

    tempArgs :=
        pathType = '"ao" =>
            -- want to strip out -Fao
            (p := STRPOS('"-Fao", $asharpCmdlineFlags, 0, NIL)) =>
                p = 0 => SUBSTRING($asharpCmdlineFlags, 5, NIL)
                STRCONC(SUBSTRING($asharpCmdlineFlags, 0, p), '" ",
                    SUBSTRING($asharpCmdlineFlags, p+5, NIL))
            $asharpCmdlineFlags
        $asharpCmdlineFlags

    asharpArgs :=
        onlyArgs =>
            s := ""
            for a in onlyArgs repeat
                s := STRCONC(s, '" ", object2String a)
            s
        moreArgs =>
            s := tempArgs
            for a in moreArgs repeat
                s := STRCONC(s, '" ", object2String a)
            s
        tempArgs

    if ^beQuiet then sayKeyedMsg("S2IZ0038A",[namestring args, asharpArgs])

    command :=
     STRCONC(STRCONC(GETENV('"ALDORROOT"),'"/bin/"),_
               "aldor ", asharpArgs, '" ", namestring args)
    rc := OBEY command

    if (rc = 0) and doCompileLisp then
        lsp := fnameMake('".", pathnameName args, '"lsp")
        if fnameReadable?(lsp) then
            if ^beQuiet then sayKeyedMsg("S2IZ0089", [namestring lsp])
            compileFileQuietly(lsp)
        else
            sayKeyedMsg("S2IL0003", [namestring lsp])

    if rc = 0 and doLibrary then
        -- do we need to worry about where the compilation output went?
        if ^beQuiet then sayKeyedMsg("S2IZ0090", [ pathnameName path ])
        withAsharpCmd [ pathnameName path ]
    else if ^beQuiet then
        sayKeyedMsg("S2IZ0084", nil)

    extendLocalLibdb $newConlist

compileAsharpArchiveCmd args ==
    -- Assume we entered from the "compiler" function, so args ^= nil
    -- and is a file with file extension .al. We also assume that
    -- the name is fully qualified.

    path := pathname args
    ^PROBE_-FILE path => throwKeyedMsg("S2IL0003",[namestring args])

    -- here is the plan:
    --   1. extract the file name and try to make a directory based
    --      on that name.
    --   2. cd to that directory and ar x the .al file
    --   3. for each .ao file that shows up, compile it
    --   4. delete the generated .ao files

    -- First try to make the directory in the current directory

    dir  := fnameMake('".", pathnameName path, '"axldir")
    exists := PROBE_-FILE dir
    isDir := directoryp namestring dir
    exists and isDir ^= 1=>
        throwKeyedMsg("S2IL0027",[namestring dir, namestring args])

    if isDir ^= 1 then
        cmd  := STRCONC('"mkdir ", namestring dir)
        rc   := OBEY cmd
        rc ^= 0 => throwKeyedMsg("S2IL0027",[namestring dir, namestring args])

    curDir := $CURRENT_-DIRECTORY

    -- cd to that directory and try to unarchive the .al file

    cd [ object2Identifier namestring dir ]

    cmd := STRCONC( '"ar x ", namestring path )
    rc := OBEY cmd
    rc ^= 0 =>
        cd [ object2Identifier namestring curDir ]
        throwKeyedMsg("S2IL0028",[namestring dir, namestring args])

    -- Look for .ao files

    asos := DIRECTORY '"*.ao"
    null asos =>
        cd [ object2Identifier namestring curDir ]
        throwKeyedMsg("S2IL0029",[namestring dir, namestring args])

    -- Compile the .ao files

    for aso in asos repeat
        compileAsharpCmd1 [ namestring aso ]

    -- Reset the current directory

    cd [ object2Identifier namestring curDir ]

    terminateSystemCommand()
    spadPrompt()

compileAsharpLispCmd args ==
    -- Assume we entered from the "compiler" function, so args ^= nil
    -- and is a file with file extension .lsp

    path := pathname args
    ^PROBE_-FILE path => throwKeyedMsg("S2IL0003",[namestring args])

    optList :=  '( _
      quiet _
      noquiet _
      library _
      nolibrary _
        )

    beQuiet := false         -- be verbose here
    doLibrary  := true       -- so a )library after compilation

    for opt in $options repeat
        [optname,:optargs] := opt
        fullopt := selectOptionLC(optname,optList,nil)

        fullopt = 'quiet     => beQuiet := true
        fullopt = 'noquiet   => beQuiet := false

        fullopt = 'library   => doLibrary  := true
        fullopt = 'nolibrary => doLibrary  := false

        throwKeyedMsg("S2IZ0036",[STRCONC('")",object2String optname)])

    lsp := fnameMake(pathnameDirectory path, pathnameName path, pathnameType path)
    if fnameReadable?(lsp) then
        if ^beQuiet then sayKeyedMsg("S2IZ0089", [namestring lsp])
        compileFileQuietly(lsp)
    else
        sayKeyedMsg("S2IL0003", [namestring lsp])

    if doLibrary then
        -- do we need to worry about where the compilation output went?
        if ^beQuiet then sayKeyedMsg("S2IZ0090", [ pathnameName path ])
        withAsharpCmd [ pathnameName path ]
    else if ^beQuiet then
        sayKeyedMsg("S2IZ0084", nil)
    terminateSystemCommand()
    spadPrompt()

compileSpadLispCmd args ==
    -- Assume we entered from the "compiler" function, so args ^= nil
    -- and is a file with file extension .NRLIB

    path := pathname fnameMake(first args, '"code", '"lsp")
    ^PROBE_-FILE path => throwKeyedMsg("S2IL0003",[namestring args])

    optList :=  '( _
      quiet _
      noquiet _
      library _
      nolibrary _
        )

    beQuiet := false         -- be verbose here
    doLibrary  := true       -- so a )library after compilation

    for opt in $options repeat
        [optname,:optargs] := opt
        fullopt := selectOptionLC(optname,optList,nil)

        fullopt = 'quiet     => beQuiet := true
        fullopt = 'noquiet   => beQuiet := false

        fullopt = 'library   => doLibrary  := true
        fullopt = 'nolibrary => doLibrary  := false

        throwKeyedMsg("S2IZ0036",[STRCONC('")",object2String optname)])

    lsp := fnameMake(pathnameDirectory path, pathnameName path, pathnameType path)
    if fnameReadable?(lsp) then
        if ^beQuiet then sayKeyedMsg("S2IZ0089", [namestring lsp])
        --compileFileQuietly(lsp)
        RECOMPILE_-LIB_-FILE_-IF_-NECESSARY lsp
    else
        sayKeyedMsg("S2IL0003", [namestring lsp])

    if doLibrary then
        -- do we need to worry about where the compilation output went?
        if ^beQuiet then sayKeyedMsg("S2IZ0090", [ pathnameName path ])
        LOCALDATABASE([ pathnameName first args ],[])
    else if ^beQuiet then
        sayKeyedMsg("S2IZ0084", nil)
    terminateSystemCommand()
    spadPrompt()

withAsharpCmd args ==
    $options: local := nil
    LOCALDATABASE(args, $options)

--% )copyright -- display copyright notice

summary l ==
 OBEY STRCONC ('"cat ", systemRootDirectory(),'"/lib/summary")

copyright () ==
 OBEY STRCONC ('"cat ", systemRootDirectory(),'"/lib/copyright")

--% )credits -- display credit list

CREDITS := '(
  "An alphabetical listing of contributors to AXIOM (to October, 2006):"
  "Cyril Alberga          Roy Adler              Christian Aistleitner"
  "Richard Anderson       George Andrews"
  "Henry Baker            Stephen Balzac         Yurij Baransky"
  "David R. Barton        Gerald Baumgartner     Gilbert Baumslag"
  "Fred Blair             Vladimir Bondarenko    Mark Botch"
  "Alexandre Bouyer       Peter A. Broadbery     Martin Brock"
  "Manuel Bronstein       Florian Bundschuh      Luanne Burns"
  "William Burge"
  "Quentin Carpent        Robert Caviness        Bruce Char"
  "Cheekai Chin           David V. Chudnovsky    Gregory V. Chudnovsky"
  "Josh Cohen             Christophe Conil       Don Coppersmith"
  "George Corliss         Robert Corless         Gary Cornell"
  "Meino Cramer           Claire Di Crescenzo"
  "Timothy Daly Sr.       Timothy Daly Jr.       James H. Davenport"
  "Jean Della Dora        Gabriel Dos Reis       Michael Dewar"
  "Claire DiCrescendo     Sam Dooley             Lionel Ducos"
  "Martin Dunstan         Brian Dupee            Dominique Duval"
  "Robert Edwards         Heow Eide-Goodman      Lars Erickson"
  "Richard Fateman        Bertfried Fauser       Stuart Feldman"
  "Brian Ford             Albrecht Fortenbacher  George Frances"
  "Constantine Frangos    Timothy Freeman        Korrinn Fu"
  "Marc Gaetano           Rudiger Gebauer        Kathy Gerber"
  "Patricia Gianni        Holger Gollan          Teresa Gomez-Diaz"
  "Laureano Gonzalez-Vega Stephen Gortler        Johannes Grabmeier"
  "Matt Grayson           James Griesmer         Vladimir Grinberg"
  "Oswald Gschnitzer      Jocelyn Guidry"
  "Steve Hague            Vilya Harvey           Satoshi Hamaguchi"
  "Martin Hassner         Waldek Hebisch         Ralf Hemmecke"
  "Henderson              Antoine Hersen"
  "Pietro Iglio"
  "Richard Jenks"
  "Kai Kaminski           Grant Keady            Tony Kennedy"
  "Paul Kosinski          Klaus Kusche           Bernhard Kutzler"
  "Larry Lambe            Frederic Lehobey       Michel Levaud"
  "Howard Levy            Rudiger Loos           Michael Lucks"
  "Richard Luczak"
  "Camm Maguire           Bob McElrath           Michael McGettrick"
  "Ian Meikle             David Mentre           Victor S. Miller"
  "Gerard Milmeister      Mohammed Mobarak       H. Michael Moeller"
  "Michael Monagan        Marc Moreno-Maza       Scott Morrison"
  "Mark Murray"
  "William Naylor         C. Andrew Neff         John Nelder"
  "Godfrey Nolan          Arthur Norman          Jinzhong Niu"
  "Michael O'Connor       Kostas Oikonomou"
  "Julian A. Padget       Bill Page              Susan Pelzel"
  "Michel Petitot         Didier Pinchon         Jose Alfredo Portes"
  "Claude Quitte"
  "Norman Ramsey          Michael Richardson     Renaud Rioboo"
  "Jean Rivlin            Nicolas Robidoux       Simon Robinson"
  "Michael Rothstein      Martin Rubey"
  "Philip Santas          Alfred Scheerhorn      William Schelter"
  "Gerhard Schneider      Martin Schoenert       Marshall Schor"
  "Frithjof Schulze       Fritz Schwarz          Nick Simicich"
  "William Sit            Elena Smirnova         Jonathan Steinbach"
  "Christine Sundaresan   Robert Sutor           Moss E. Sweedler"
  "Eugene Surowitz"
  "James Thatcher         Balbir Thomas          Mike Thomas"
  "Dylan Thurston         Barry Trager           Themos T. Tsikas"
  "Gregory Vanuxem"
  "Bernhard Wall          Stephen Watt           Jaap Weel"
  "Juergen Weiss          M. Weller              Mark Wegman"
  "James Wen              Thorsten Werther       Michael Wester"
  "John M. Wiley          Berhard Will           Clifton J. Williamson"
  "Stephen Wilson         Shmuel Winograd        Robert Wisbauer"
  "Sandra Wityak          Waldemar Wiwianka      Knut Wolf"
  "Clifford Yapp          David Yun"
  "Richard Zippel         Evelyn Zoernack        Bruno Zuercher"
  "Dan Zwillinger"
 )

credits() ==
 for i in CREDITS repeat
  PRINC(i)
  TERPRI()

--% )display

display l == displaySpad2Cmd l

displaySpad2Cmd l ==
  $e: local := $EmptyEnvironment
  l is [opt,:vl] and opt ^= "?" =>
    option := selectOptionLC(opt,$displayOptions,'optionError) =>

      -- the option may be given in the plural but the property in
      -- the alist is sometimes singular

      option :=
        option = 'all   =>
            l := ['properties]
            'properties
        (option = 'modes) or (option = 'types) =>
            l := ['type, :vl]
            'type
        option = 'values =>
            l := ['value, :vl]
            'value
        option

      option = 'abbreviations =>
        null vl => listConstructorAbbreviations()
        for v in vl repeat abbQuery(opOf v)

      option = 'operations =>     displayOperations vl
      option = 'macros =>         displayMacros vl
      option = 'names =>          displayWorkspaceNames()
      displayProperties(option,l)
  optList:= [:['%l,'"        ",x] for x in $displayOptions]
  msg := [:bright '"  )display",'"keyword arguments are",
    :bright optList,'%l,'"   or abbreviations thereof."]
  sayMessage msg

displayMacros names ==
  imacs := getInterpMacroNames()
  pmacs := getParserMacroNames()
  macros :=
     null names => APPEND (imacs, pmacs)
     names
  macros := REMDUP macros

  null macros => sayBrightly '"   There are no OpenAxiom macros."

  -- first do user defined ones

  first := true
  for macro in macros repeat
    macro in pmacs =>
        if first then
            sayBrightly ['%l,'"User-defined macros:"]
            first := NIL
        displayParserMacro macro
    macro in imacs => 'iterate
    sayBrightly (["   ",'%b, macro, '%d, " is not a known OpenAxiom macro."])

  -- now system ones

  first := true
  for macro in macros repeat
    macro in imacs =>
        macro in pmacs => 'iterate
        if first then
            sayBrightly ['%l,'"System-defined macros:"]
            first := NIL
        displayMacro macro
    macro in pmacs => 'iterate
  NIL

getParserMacroNames() ==
  REMDUP [CAR mac for mac in getParserMacros()]

clearParserMacro(macro) ==
  -- first see if it is one
  not IFCDR assoc(macro, $pfMacros) => NIL
  $pfMacros := REMALIST($pfMacros, macro)

displayMacro name ==
  m := isInterpMacro name
  null m =>
    sayBrightly ['"  ",:bright name,'"is not an interpreter macro."]
  -- $op is needed in the output routines.
  $op : local := STRCONC('"macro ",object2String name)
  [args,:body] := m
  args :=
    null args => nil
    null rest args => first args
    ['Tuple,:args]
  mathprint ['MAP,[args,:body]]

displayWorkspaceNames() ==
  imacs := getInterpMacroNames()
  pmacs := getParserMacroNames()
  sayMessage '"Names of User-Defined Objects in the Workspace:"
  names := MSORT append(getWorkspaceNames(),pmacs)
  if null names
    then sayBrightly "   * None *"
    else sayAsManyPerLineAsPossible [object2String x for x in names]
  imacs := SETDIFFERENCE(imacs,pmacs)
  if imacs then
    sayMessage '"Names of System-Defined Objects in the Workspace:"
    sayAsManyPerLineAsPossible [object2String x for x in imacs]


getWorkspaceNames() ==
  NMSORT [n for [n,:.] in CAAR $InteractiveFrame |
    (n ^= "--macros--" and n^= "--flags--")]

displayOperations l ==
  null l =>
    x := UPCASE queryUserKeyedMsg("S2IZ0058",NIL)
    if MEMQ(STRING2ID_-N(x,1),'(Y YES))
      then for op in allOperations() repeat reportOpSymbol op
      else sayKeyedMsg("S2IZ0059",NIL)
    nil
  for op in l repeat reportOpSymbol op

interpFunctionDepAlists() ==
  $e : local := $InteractiveFrame
  deps := getFlag "$dependencies"
  $dependentAlist := [[NIL,:NIL]]
  $dependeeAlist := [[NIL,:NIL]]
  for [dependee,dependent] in deps repeat
    $dependentAlist := PUTALIST($dependentAlist,dependee,
      CONS(dependent,GETALIST($dependentAlist,dependee)))
    $dependeeAlist  := PUTALIST($dependeeAlist,dependent,
      CONS(dependee,GETALIST($dependeeAlist,dependent)))

fixObjectForPrinting(v) ==
    v' := object2Identifier v
    EQ(v',"%") => '"\%"
    v' in $msgdbPrims => STRCONC('"\",PNAME v')
    v

displayProperties(option,l) ==
  $dependentAlist : local
  $dependeeAlist  : local
  [opt,:vl]:= (l or ['properties])
  imacs := getInterpMacroNames()
  pmacs := getParserMacroNames()
  macros := REMDUP append(imacs, pmacs)
  if vl is ['all] or null vl then
    vl := MSORT append(getWorkspaceNames(),macros)
  if $frameMessages then sayKeyedMsg("S2IZ0065",[$interpreterFrameName])
  null vl =>
    null $frameMessages => sayKeyedMsg("S2IZ0066",NIL)
    sayKeyedMsg("S2IZ0067",[$interpreterFrameName])
  interpFunctionDepAlists()
  for v in vl repeat
    isInternalMapName(v) => 'iterate
    pl := getIProplist(v)
    option = 'flags =>     getAndSay(v,"flags")
    option = 'value =>     displayValue(v,getI(v,'value),nil)
    option = 'condition => displayCondition(v,getI(v,"condition"),nil)
    option = 'mode =>      displayMode(v,getI(v,'mode),nil)
    option = 'type =>      displayType(v,getI(v,'value),nil)
    option = 'properties =>
      v = "--flags--" => nil
      pl is [['cacheInfo,:.],:.] => nil
      v1 := fixObjectForPrinting(v)
      sayMSG ['"Properties of",:bright prefix2String v1,'":"]
      null pl =>
        v in pmacs =>
            sayMSG '"   This is a user-defined macro."
            displayParserMacro v
        isInterpMacro v =>
            sayMSG '"   This is a system-defined macro."
            displayMacro v
        sayMSG '"   none"
      propsSeen:= nil
      for [prop,:val] in pl | ^MEMQ(prop,propsSeen) and val repeat
        prop in '(alias generatedCode IS_-GENSYM mapBody localVars) =>
          nil
        prop = 'condition =>
          displayCondition(prop,val,true)
        prop = 'recursive =>
          sayMSG '"   This is recursive."
        prop = 'isInterpreterFunction =>
          sayMSG '"   This is an interpreter function."
          sayFunctionDeps v where
            sayFunctionDeps x ==
              if dependents := GETALIST($dependentAlist,x) then
                null rest dependents =>
                  sayMSG ['"   The following function or rule ",
                    '"depends on this:",:bright first dependents]
                sayMSG
                  '"   The following functions or rules depend on this:"
                msg := ["%b",'"     "]
                for y in dependents repeat msg := ['" ",y,:msg]
                sayMSG [:nreverse msg,"%d"]
              if dependees := GETALIST($dependeeAlist,x) then
                null rest dependees =>
                  sayMSG ['"   This depends on the following function ",
                    '"or rule:",:bright first dependees]
                sayMSG
                  '"   This depends on the following functions or rules:"
                msg := ["%b",'"     "]
                for y in dependees repeat msg := ['" ",y,:msg]
                sayMSG [:nreverse msg,"%d"]
        prop = 'isInterpreterRule =>
          sayMSG '"   This is an interpreter rule."
          sayFunctionDeps v
        prop = 'localModemap =>
          displayModemap(v,val,true)
        prop = 'mode =>
          displayMode(prop,val,true)
        prop = 'value =>
          val => displayValue(v,val,true)
        sayMSG ['"   ",prop,'":  ",val]
        propsSeen:= [prop,:propsSeen]
    sayKeyedMsg("S2IZ0068",[option])
  terminateSystemCommand()

displayModemap(v,val,giveVariableIfNil) ==
  for mm in val repeat g(v,mm,giveVariableIfNil) where
    g(v,mm,giveVariableIfNil) ==
      [[local,:signature],fn,:.]:= mm
      local='interpOnly => nil
      varPart:= (giveVariableIfNil => nil; ['" of",:bright v])
      prefix:= ["   Compiled function type",:varPart,": "]
      sayBrightly concat(prefix,formatSignature signature)

displayMode(v,mode,giveVariableIfNil) ==
  null mode => nil
  varPart:= (giveVariableIfNil => nil; [" of",:bright fixObjectForPrinting v])
  sayBrightly concat("   Declared type or mode",
    varPart,":   ",prefix2String mode)

displayCondition(v,condition,giveVariableIfNil) ==
  varPart:= (giveVariableIfNil => nil; [" of",:bright v])
  condPart:= condition or 'true
  sayBrightly concat("   condition",varPart,":  ",pred2English condPart)

getAndSay(v,prop) ==
  val:= getI(v,prop) => sayMSG ["    ",val,'%l]
  sayMSG ["    none",'%l]

displayType($op,u,omitVariableNameIfTrue) ==
  null u =>
    sayMSG ['"   Type of value of ",
        fixObjectForPrinting PNAME $op,'":  (none)"]
  type := prefix2String objMode(u)
  if ATOM type then type := [type]
  sayMSG concat ['"   Type of value of ",fixObjectForPrinting PNAME $op,'": ",:type]
  NIL

displayValue($op,u,omitVariableNameIfTrue) ==
  null u => sayMSG ["   Value of ",fixObjectForPrinting PNAME $op,'":  (none)"]
  expr := objValUnwrap(u)
  expr is [op,:.] and (op = 'MAP) or objMode(u) = $EmptyMode =>
    displayRule($op,expr)
  label:=
    omitVariableNameIfTrue =>
        rhs := '"):  "
        '"Value (has type "
    rhs := '":  "
    STRCONC('"Value of ", PNAME $op,'": ")
  labmode := prefix2String objMode(u)
  if ATOM labmode then labmode := [labmode]
  GETDATABASE(expr,'CONSTRUCTORKIND) = 'domain =>
    sayMSG concat('"   ",label,labmode,rhs,form2String expr)
  mathprint ['CONCAT,label,:labmode,rhs,
    outputFormat(expr,objMode(u))]
  NIL

--% )edit

edit l == editSpad2Cmd l

editSpad2Cmd l ==
  l:= 
    null l => _/EDITFILE
    CAR l
  l := pathname l
  oldDir := pathnameDirectory l
  fileTypes :=
    pathnameType l => [pathnameType l]
    $UserLevel = 'interpreter => '("input" "INPUT" "spad" "SPAD")
    $UserLevel = 'compiler    => '("input" "INPUT" "spad" "SPAD")
    '("input" "INPUT" "spad" "SPAD" "boot" "BOOT" "lisp" "LISP" "meta" "META")
  ll := 
       oldDir = '"" => pathname $FINDFILE (pathnameName l, fileTypes)
       l
  l := pathname ll
  SETQ(_/EDITFILE,l)
  rc := editFile l
  updateSourceFiles l
  rc

--% )help

help l == helpSpad2Cmd l

helpSpad2Cmd args ==
  -- try to use new stuff first
  if newHelpSpad2Cmd(args) then return nil

  sayKeyedMsg("S2IZ0025",[args])
  nil

newHelpSpad2Cmd args ==
  if null args then args := ["?"]
  # args > 1 =>
    sayKeyedMsg("S2IZ0026",NIL)
    true
  sarg := PNAME first args
  if sarg = '"?" then args := ['help]
  else if sarg = '"%" then args := ['history]
       else if sarg = '"%%" then args := ['history]
  arg := selectOptionLC(first args,$SYSCOMMANDS,nil)
  if null arg then arg := first args
  if arg = 'compiler then arg := 'compile

  -- see if new help file exists

  narg := PNAME arg
  null (helpFile := MAKE_-INPUT_-FILENAME [narg,'HELPSPAD,'_*]) => NIL

  $useFullScreenHelp =>
    OBEY STRCONC('"$AXIOM/lib/SPADEDIT ",namestring helpFile)
    true

  filestream := MAKE_-INSTREAM(helpFile)
  repeat
    line := read_-line(filestream,false)
    NULL line =>
      SHUT filestream
      return true
    SAY line
  true

--%
--% )frame
--%

$frameRecord  := nil  --Initial setting for frame record
$previousBindings := nil

frame l == frameSpad2Cmd l

frameName(frame) == CAR frame

frameNames() == [frameName f for f in $interpreterFrameRing]

frameEnvironment fname ==
  -- extracts the environment portion of a frame
  -- if fname is not a valid frame name then the empty environment
  -- is returned
  fname = frameName first $interpreterFrameRing => $InteractiveFrame
  ifr := rest $interpreterFrameRing
  e := LIST LIST NIL
  while ifr repeat
    [f,:ifr] := ifr
    if fname = frameName f   then
      e := CADR f
      ifr := NIL
  e

frameSpad2Cmd args ==
  frameArgs := '(drop import last names new next)
  $options => throwKeyedMsg("S2IZ0016",['")frame"])
  null(args) => helpSpad2Cmd ['frame]
  arg  := selectOptionLC(first args,frameArgs,'optionError)
  args := rest args
  if args is [a] then args := a
  if ATOM args then args := object2Identifier args
  arg = 'drop  =>
    args and PAIRP(args) => throwKeyedMsg("S2IZ0017",[args])
    closeInterpreterFrame(args)
  arg = "import" =>  importFromFrame args
  arg = "last"  =>   previousInterpreterFrame()
  arg = "names" =>   displayFrameNames()
  arg = "new"   =>
    args and PAIRP(args) => throwKeyedMsg("S2IZ0017",[args])
    addNewInterpreterFrame(args)
  arg = "next"  =>   nextInterpreterFrame()

  NIL

addNewInterpreterFrame(name) ==
  null name => throwKeyedMsg("S2IZ0018",NIL)
  updateCurrentInterpreterFrame()
  -- see if we already have one by that name
  for f in $interpreterFrameRing repeat
    name = frameName(f) => throwKeyedMsg("S2IZ0019",[name])
  initHistList()
  $interpreterFrameRing := CONS(emptyInterpreterFrame(name),
    $interpreterFrameRing)
  updateFromCurrentInterpreterFrame()
  _$ERASE histFileName()

emptyInterpreterFrame(name) ==
  LIST(name,                            -- frame name
       LIST LIST NIL,                   -- environment
       1,                               -- $IOindex
       $HiFiAccess,                     -- $HiFiAccess
       $HistList,                       -- $HistList
       $HistListLen,                    -- $HistListLen
       $HistListAct,                    -- $HistListAct
       $HistRecord,                     -- $HistRecord
       NIL,                             -- $internalHistoryTable
       COPY_-SEQ $localExposureDataDefault        -- $localExposureData
      )

closeInterpreterFrame(name) ==
  -- if name = NIL then it means the current frame
  null rest $interpreterFrameRing =>
    name and (name ^= $interpreterFrameName) =>
      throwKeyedMsg("S2IZ0020",[$interpreterFrameName])
    throwKeyedMsg("S2IZ0021",NIL)
  if null name then $interpreterFrameRing := rest $interpreterFrameRing
  else   -- find the frame
    found := nil
    ifr := NIL
    for f in $interpreterFrameRing repeat
      found or (name ^= frameName(f)) => ifr := CONS(f,ifr)
      found := true
    not found => throwKeyedMsg("S2IZ0022",[name])
    _$ERASE makeHistFileName(name)
    $interpreterFrameRing := nreverse ifr
  updateFromCurrentInterpreterFrame()

previousInterpreterFrame() ==
  updateCurrentInterpreterFrame()
  null rest $interpreterFrameRing => NIL  -- nothing to do
  [:b,l] := $interpreterFrameRing
  $interpreterFrameRing := NCONC2([l],b)
  updateFromCurrentInterpreterFrame()

nextInterpreterFrame() ==
  updateCurrentInterpreterFrame()
  null rest $interpreterFrameRing => NIL  -- nothing to do
  $interpreterFrameRing :=
    NCONC2(rest $interpreterFrameRing,[first $interpreterFrameRing])
  updateFromCurrentInterpreterFrame()


createCurrentInterpreterFrame() ==
  LIST($interpreterFrameName,           -- frame name
       $InteractiveFrame,               -- environment
       $IOindex,                        -- $IOindex
       $HiFiAccess,                     -- $HiFiAccess
       $HistList,                       -- $HistList
       $HistListLen,                    -- $HistListLen
       $HistListAct,                    -- $HistListAct
       $HistRecord,                     -- $HistRecord
       $internalHistoryTable,           -- $internalHistoryTable
       $localExposureData               -- $localExposureData
      )


updateFromCurrentInterpreterFrame() ==
  [$interpreterFrameName,          _
   $InteractiveFrame,              _
   $IOindex,                       _
   $HiFiAccess,                    _
   $HistList,                      _
   $HistListLen,                   _
   $HistListAct,                   _
   $HistRecord,                    _
   $internalHistoryTable,          _
   $localExposureData              _
   ] := first $interpreterFrameRing
  if $frameMessages then
    sayMessage ['"   Current interpreter frame is called",:bright
      $interpreterFrameName]
  NIL


updateCurrentInterpreterFrame() ==
  RPLACA($interpreterFrameRing,createCurrentInterpreterFrame())
  updateFromCurrentInterpreterFrame()
  NIL

initializeInterpreterFrameRing() ==
  $interpreterFrameName := 'initial
  $interpreterFrameRing := [emptyInterpreterFrame($interpreterFrameName)]
  updateFromCurrentInterpreterFrame()
  NIL


changeToNamedInterpreterFrame(name) ==
  updateCurrentInterpreterFrame()
  frame := findFrameInRing(name)
  null frame => NIL
  $interpreterFrameRing := [frame,:NREMOVE($interpreterFrameRing, frame)]
  updateFromCurrentInterpreterFrame()

makeInitialModemapFrame() == COPY $InitialModemapFrame

findFrameInRing(name) ==
  val := NIL
  for frame in $interpreterFrameRing repeat
    CAR frame = name =>
      val := frame
      return frame
  val

displayFrameNames() ==
  fs := "append"/[ ['%l,'"     ",:bright frameName f] for f in
    $interpreterFrameRing]
  sayKeyedMsg("S2IZ0024",[fs])

importFromFrame args ==
  -- args should have the form [frameName,:varNames]
  if args and atom args then args := [args]
  null args => throwKeyedMsg("S2IZ0073",NIL)
  [fname,:args] := args
  not member(fname,frameNames()) =>
    throwKeyedMsg("S2IZ0074",[fname])
  fname = frameName first $interpreterFrameRing =>
    throwKeyedMsg("S2IZ0075",NIL)
  fenv := frameEnvironment fname
  null args =>
    x := UPCASE queryUserKeyedMsg("S2IZ0076",[fname])
    MEMQ(STRING2ID_-N(x,1),'(Y YES)) =>
      vars := NIL
      for [v,:props] in CAAR fenv repeat
        v = "--macros" =>
          for [m,:.] in props repeat vars := cons(m,vars)
        vars := cons(v,vars)
      importFromFrame [fname,:vars]
    sayKeyedMsg("S2IZ0077",[fname])
  for v in args repeat
    plist := GETALIST(CAAR fenv,v)
    plist =>
      -- remove anything with the same name in the current frame
      clearCmdParts ['propert,v]
      for [prop,:val] in plist repeat
        putHist(v,prop,val,$InteractiveFrame)
    (m := get("--macros--",v,fenv)) =>
      putHist("--macros--",v,m,$InteractiveFrame)
    sayKeyedMsg("S2IZ0079",[v,fname])
  sayKeyedMsg("S2IZ0078",[fname])



--% )history

++ vm/370 filename type component
$historyFileType := 'axh

++ vm/370 filename name component
$oldHistoryFileName := 'last
$internalHistoryTable := NIL

++ t means keep history in core
$useInternalHistoryTable := true

++ vm/370 filename disk component
$historyDirectory := "A"

++ true means turn on history mechanism
$HiFiAccess := true

history l ==
  l or null $options => sayKeyedMsg("S2IH0006",NIL) 
  historySpad2Cmd()


makeHistFileName(fname) ==
  makePathname(fname,$historyFileType,$historyDirectory)

oldHistFileName() ==
  makeHistFileName($oldHistoryFileName)

histFileName() ==
  makeHistFileName($interpreterFrameName)


histInputFileName(fn) ==
  null fn =>
    makePathname($interpreterFrameName,'INPUT,$historyDirectory)
  makePathname(fn,'INPUT,$historyDirectory)


initHist() ==
  $useInternalHistoryTable => initHistList()
  oldFile := oldHistFileName()
  newFile := histFileName()
  -- see if history directory is writable
  histFileErase oldFile
  if MAKE_-INPUT_-FILENAME newFile then $REPLACE(oldFile,newFile)
  $HiFiAccess:= true
  initHistList()

initHistList() ==
  -- creates $HistList as a circular list of length $HistListLen
  -- and $HistRecord
  $HistListLen:= 20
  $HistList:= LIST NIL
  li:= $HistList
  for i in 1..$HistListLen repeat li:= CONS(NIL,li)
  RPLACD($HistList,li)
  $HistListAct:= 0
  $HistRecord:= NIL

historySpad2Cmd() ==
  -- history is a system command which can call resetInCoreHist
  -- and changeHistListLen, and restore last session
  histOptions:=
    '(on off yes no change reset restore write save show file memory)
  opts:= [ [selectOptionLC(opt,histOptions,'optionError),:optargs]
    for [opt,:optargs] in $options]
  for [opt,:optargs] in opts repeat
    opt in '(on yes) =>
      $HiFiAccess => sayKeyedMsg("S2IH0007",NIL) 
      $IOindex = 1 =>       -- haven't done anything yet
        $HiFiAccess:= true
        initHistList()
        sayKeyedMsg("S2IH0008",NIL) 
      x := UPCASE queryUserKeyedMsg("S2IH0009",NIL) 
      MEMQ(STRING2ID_-N(x,1),'(Y YES)) =>
        histFileErase histFileName()
        $HiFiAccess:= true
        $options := nil
        clearSpad2Cmd '(all)
        sayKeyedMsg("S2IH0008",NIL)
        initHistList()
      sayKeyedMsg("S2IH0010",NIL)
    opt in '(off no) =>
      null $HiFiAccess => sayKeyedMsg("S2IH0011",NIL)
      $HiFiAccess:= false
      disableHist()
      sayKeyedMsg("S2IH0012",NIL)
    opt = 'file    => setHistoryCore NIL
    opt = 'memory  => setHistoryCore true
    opt = 'reset   => resetInCoreHist()
    opt = 'save    => saveHistory optargs
    opt = 'show    => showHistory optargs
    opt = 'change  => changeHistListLen first optargs
    opt = 'restore => restoreHistory optargs
    opt = 'write   => writeInputLines(optargs,1)
  'done


setHistoryCore inCore ==
  inCore = $useInternalHistoryTable =>
    sayKeyedMsg((inCore => "S2IH0030"; "S2IH0029"),NIL) 
  not $HiFiAccess =>
    $useInternalHistoryTable := inCore
    inCore => sayKeyedMsg("S2IH0032",NIL)
    sayKeyedMsg("S2IH0031",NIL)
  inCore =>
    $internalHistoryTable := NIL
    if $IOindex ^= 0 then
      -- actually put something in there
      l := LENGTH RKEYIDS histFileName()
      for i in 1..l repeat
        vec:= UNWIND_-PROTECT(readHiFi(i),disableHist())
        $internalHistoryTable := CONS([i,:vec],$internalHistoryTable)
      histFileErase histFileName()
    $useInternalHistoryTable := true
    sayKeyedMsg("S2IH0032",NIL)
  $HiFiAccess:= false
  histFileErase histFileName()
  str := RDEFIOSTREAM ['(MODE . OUTPUT),['FILE,:histFileName()]]
  for [n,:rec] in reverse $internalHistoryTable repeat
    SPADRWRITE(object2Identifier n,rec,str)
  RSHUT str
  $HiFiAccess:= true
  $internalHistoryTable := NIL
  $useInternalHistoryTable := NIL
  sayKeyedMsg("S2IH0031",NIL)


writeInputLines(fn,initial) == 
  -- writes all input lines into file histInputFileName()
  not $HiFiAccess => sayKeyedMsg("S2IH0013",NIL) -- history not on
  null fn =>
    throwKeyedMsg("S2IH0038", nil)          -- missing file name
  maxn := 72
  breakChars := [" ","+"]
  for i in initial..$IOindex - 1 repeat
    vecl := CAR readHiFi i
    if STRINGP vecl then vecl := [vecl]
    for vec in vecl repeat
      n := SIZE vec
      while n > maxn repeat
        -- search backwards for a blank
        done := nil
        for j in 1..maxn while ^done repeat
          k := 1 + maxn - j
          MEMQ(vec.k,breakChars) =>
            svec := STRCONC(SUBSTRING(vec,0,k+1),UNDERBAR)
            lineList := [svec,:lineList]
            done := true
            vec := SUBSTRING(vec,k+1,NIL)
            n := SIZE vec
        -- in case we can't find a breaking point
        if ^done then n := 0
      lineList := [vec,:lineList]
  file := histInputFileName(fn)
  histFileErase file
  inp:= DEFIOSTREAM(['(MODE . OUTPUT),['FILE,:file]],255,0)
  for x in removeUndoLines NREVERSE lineList repeat WRITE_-LINE(x,inp)
  -- see file "undo" for definition of removeUndoLines
  if fn ^= 'redo then sayKeyedMsg("S2IH0014",[namestring file])
  SHUT inp
  NIL


resetInCoreHist() ==
  -- removes all pointers from $HistList
  $HistListAct:= 0
  for i in 1..$HistListLen repeat
    $HistList:= CDR $HistList
    RPLACA($HistList,NIL)

changeHistListLen(n) ==
  -- changes the length of $HistList.  n must be nonnegative
  NULL INTEGERP n => sayKeyedMsg("S2IH0015",[n]) 
  dif:= n-$HistListLen
  $HistListLen:= n
  l:= CDR $HistList
  if dif > 0 then
    for i in 1..dif repeat l:= CONS(NIL,l)
  if dif < 0 then
    for i in 1..-dif repeat l:= CDR l
    if $HistListAct > n then $HistListAct:= n
  RPLACD($HistList,l)
  'done

updateHist() ==
  -- updates the history file and calls updateInCoreHist
  null $IOindex => nil
  startTimingProcess 'history
  updateInCoreHist()
  if $HiFiAccess then
    UNWIND_-PROTECT(writeHiFi(),disableHist())
    $HistRecord:= NIL
  $IOindex:= $IOindex+1
  updateCurrentInterpreterFrame()
  $mkTestInputStack := nil
  $currentLine := nil
  stopTimingProcess 'history

updateInCoreHist() ==
  -- updates $HistList and $IOindex
  $HistList:= CDR($HistList)
  RPLACA($HistList,NIL)
  if $HistListAct < $HistListLen then $HistListAct:= $HistListAct+1

putHist(x,prop,val,e) ==
  -- records new value to $HistRecord and old value to $HistList
  -- then put is called with e
  if not (x='%) then recordOldValue(x,prop,get(x,prop,e))
  if $HiFiAccess then recordNewValue(x,prop,val)
  putIntSymTab(x,prop,val,e)

histFileErase file ==
  --OBEY STRCONC('"rm -rf ", file)
  PROBE_-FILE(file) and DELETE_-FILE(file)



recordNewValue(x,prop,val) ==
  startTimingProcess 'history
  recordNewValue0(x,prop,val)
  stopTimingProcess 'history

recordNewValue0(x,prop,val) ==
  -- writes (prop . val) into $HistRecord
  -- updateHist writes this stuff out into the history file
  p1:= ASSQ(x,$HistRecord) =>
    p2:= ASSQ(prop,CDR p1) =>
      RPLACD(p2,val)
    RPLACD(p1,CONS(CONS(prop,val),CDR p1))
  p:= CONS(x,list CONS(prop,val))
  $HistRecord:= CONS(p,$HistRecord)

recordOldValue(x,prop,val) ==
  startTimingProcess 'history
  recordOldValue0(x,prop,val)
  stopTimingProcess 'history

recordOldValue0(x,prop,val) ==
  -- writes (prop . val) into $HistList
  p1:= ASSQ(x,CAR $HistList) =>
    not ASSQ(prop,CDR p1) =>
      RPLACD(p1,CONS(CONS(prop,val),CDR p1))
  p:= CONS(x,list CONS(prop,val))
  RPLACA($HistList,CONS(p,CAR $HistList))

undoInCore(n) ==
  -- undoes the last n>0 steps using $HistList
  -- resets $InteractiveFrame
  li:= $HistList
  for i in n..$HistListLen repeat li:= CDR li
  undoChanges(li)
  n:= $IOindex-n-1
  n>0 and
    $HiFiAccess =>
      vec:= CDR UNWIND_-PROTECT(readHiFi(n),disableHist())
      val:= ( p:= ASSQ('%,vec) ) and ( p1:= ASSQ('value,CDR p) ) and
        CDR p1
    sayKeyedMsg("S2IH0019",[n])
  $InteractiveFrame:= putHist('%,'value,val,$InteractiveFrame)
  updateHist()

undoChanges(li) ==
  -- undoes all changes of list 'li'
  if not CDR li = $HistList then undoChanges CDR li
  for p1 in CAR li repeat
    x:= CAR p1
    for p2 in CDR p1 repeat
      putHist(x,CAR p2,CDR p2,$InteractiveFrame)

undoFromFile(n) ==
  -- makes a clear and redoes all the assignments until step n
  for [x,:varl] in CAAR $InteractiveFrame repeat
    for p in varl repeat
      [prop,:val]:= p
      val =>
        if not (x='%) then recordOldValue(x,prop,val)
        if $HiFiAccess then recordNewValue(x,prop,val)
        RPLACD(p,NIL)
  for i in 1..n repeat
    vec:= UNWIND_-PROTECT(CDR readHiFi(i),disableHist())
    for p1 in vec repeat
      x:= CAR p1
      for p2 in CDR p1 repeat
        $InteractiveFrame:= putHist(x,CAR p2,CDR p2,$InteractiveFrame)
  val:= ( p:= ASSQ('%,vec) ) and ( p1:= ASSQ('value,CDR p) ) and CDR p1
  $InteractiveFrame:= putHist('%,'value,val,$InteractiveFrame)
  updateHist()

saveHistory(fn) ==
  $seen: local := MAKE_-HASHTABLE 'EQ
  not $HiFiAccess => sayKeyedMsg("S2IH0016",NIL)
  not $useInternalHistoryTable and
    null MAKE_-INPUT_-FILENAME histFileName() => sayKeyedMsg("S2IH0022",NIL)
  null fn => 
    throwKeyedMsg("S2IH0037", nil)
  savefile := makeHistFileName(fn)
  inputfile := histInputFileName(fn)
  writeInputLines(fn,1)
  histFileErase savefile
 
  if $useInternalHistoryTable
    then
      saveStr := RDEFIOSTREAM ['(MODE . OUTPUT),['FILE,:savefile]]
      for [n,:rec] in reverse $internalHistoryTable repeat
        val := SPADRWRITE0(object2Identifier n,rec,saveStr)
        val = 'writifyFailed =>
          sayKeyedMsg("S2IH0035", [n, inputfile]) -- unable to save step
      RSHUT saveStr
  sayKeyedMsg("S2IH0018",[namestring(savefile)])  -- saved hist file named
  nil

restoreHistory(fn) ==
  -- uses fn $historyFileType to recover an old session
  -- if fn = NIL, then use $oldHistoryFileName
  if null fn then fn' := $oldHistoryFileName
  else if fn is [fn'] and IDENTP(fn') then fn' := fn'
       else throwKeyedMsg("S2IH0023",[fn'])
  restfile := makeHistFileName(fn')
  null MAKE_-INPUT_-FILENAME restfile =>
    sayKeyedMsg("S2IH0024",[namestring(restfile)]) -- no history file
 
  -- if clear is changed to be undoable, this should be a reset-clear
  $options: local := nil
  clearSpad2Cmd '(all)
 
  curfile := histFileName()
  histFileErase curfile
  _$FCOPY(restfile,curfile)
 
  l:= LENGTH RKEYIDS curfile
  $HiFiAccess:= true
  oldInternal := $useInternalHistoryTable
  $useInternalHistoryTable := NIL
  if oldInternal then $internalHistoryTable := NIL
  for i in 1..l repeat
    vec:= UNWIND_-PROTECT(readHiFi(i),disableHist())
    if oldInternal then $internalHistoryTable :=
      CONS([i,:vec],$internalHistoryTable)
    LINE:= CAR vec
    for p1 in CDR vec repeat
      x:= CAR p1
      for p2 in CDR p1 repeat
        $InteractiveFrame:= putHist(x,CAR p2,CDR p2,$InteractiveFrame)
    updateInCoreHist()
  $e := $InteractiveFrame
  for [a,:.] in CAAR $InteractiveFrame repeat
    get(a,'localModemap,$InteractiveFrame) =>
      rempropI(a,'localModemap)
      rempropI(a,'localVars)
      rempropI(a,'mapBody)
  $IOindex:= l+1
  $useInternalHistoryTable := oldInternal
  sayKeyedMsg("S2IH0025",[namestring(restfile)]) 
  clearCmdSortedCaches()
  nil


-- the following used to be the show command when that was used to
-- show history.
showHistory(arg) ==
  -- arg can be of form
  --    NIL          show at most last 20 input lines
  --    (n)          show at most last n input lines
  --    (lit)        where lit is an abbreviation for 'input or 'both
  --                 if 'input, same as NIL
  --                 if 'both, show last 5 input and outputs
  --    (n lit)      show last n input lines + last n output lines
  --                 if lit expands to 'both
  $evalTimePrint: local:= 0
  $printTimeSum: local:= 0
  -- ugh!!! these are needed for timedEvaluateStream
  -- displays the last n steps, default n=20
  not $HiFiAccess => sayKeyedMsg("S2IH0026",['show])
  showInputOrBoth := 'input
  n := 20
  nset := nil
  if arg then
    arg1 := CAR arg
    if INTEGERP arg1 then
      n := arg1
      nset := true
      KDR arg => arg1 := CADR arg
      arg1 := NIL
    arg1 =>
      arg2 := selectOptionLC(arg1,'(input both),nil)
      if arg2
        then ((showInputOrBoth := arg2) = 'both) and (null nset) => n:= 5
        else sayMSG
          concat('"  ",bright arg1,'"is an invalid argument.")
  if n >= $IOindex then n:= $IOindex-1
  mini:= $IOindex-n
  maxi:= $IOindex-1
  showInputOrBoth = 'both =>
    UNWIND_-PROTECT(showInOut(mini,maxi),setIOindex(maxi+1))
  showInput(mini,maxi)

setIOindex(n) ==
  -- set $IOindex to n
  $IOindex:= n

showInput(mini,maxi) ==
  -- displays all input lines from mini to maxi
  for ind in mini..maxi repeat
    vec:= UNWIND_-PROTECT(readHiFi(ind),disableHist())
    if ind<10 then TAB 2 else if ind<100 then TAB 1
    l := CAR vec
    STRINGP l =>
      sayMSG ['"   [",ind,'"] ",CAR vec]
    sayMSG ['"   [",ind,'"] " ]
    for ln in l repeat
      sayMSG ['"      ", ln]

showInOut(mini,maxi) ==
  -- displays all steps from mini to maxi
  for ind in mini..maxi repeat
    vec:= UNWIND_-PROTECT(readHiFi(ind),disableHist())
    sayMSG [CAR vec]
    Alist:= ASSQ('%,CDR vec) =>
      triple:= CDR ASSQ('value,CDR Alist)
      $IOindex:= ind
      spadPrint(objValUnwrap triple,objMode triple)

fetchOutput(n) ==
  -- result is the output of step n
  (n = -1) and (val := getI("%",'value)) => val
  $HiFiAccess =>
    n:=
      n < 0 => $IOindex+n
      n
    n >= $IOindex => throwKeyedMsg("S2IH0001",[n])
    n < 1        => throwKeyedMsg("S2IH0002",[n])
    vec:= UNWIND_-PROTECT(readHiFi(n),disableHist())
    Alist:= ASSQ('%,CDR vec) =>
      val:= CDR ASSQ('value,CDR Alist) => val
      throwKeyedMsg("S2IH0003",[n])
    throwKeyedMsg("S2IH0003",[n])
  throwKeyedMsg("S2IH0004",NIL)

readHiFi(n) ==
  -- reads the file using index n
  if $useInternalHistoryTable
  then
    pair := assoc(n,$internalHistoryTable)
    ATOM pair => keyedSystemError("S2IH0034",NIL)
    vec := QCDR pair
  else
    HiFi:= RDEFIOSTREAM ['(MODE . INPUT),['FILE,:histFileName()]]
    vec:= SPADRREAD(object2Identifier n,HiFi)
    RSHUT HiFi
  vec

writeHiFi() ==
  -- writes the information of the current step out to history file
  if $useInternalHistoryTable
  then
    $internalHistoryTable := CONS([$IOindex,$currentLine,:$HistRecord],
      $internalHistoryTable)
  else
    HiFi:= RDEFIOSTREAM ['(MODE . OUTPUT),['FILE,:histFileName()]]
    SPADRWRITE(object2Identifier $IOindex, CONS($currentLine,$HistRecord),HiFi)
    RSHUT HiFi

disableHist() ==
  -- disables the history mechanism if an error occurred in the protected
  -- piece of code
  not $HiFiAccess => histFileErase histFileName()
  NIL

writeHistModesAndValues() ==
  for [a,:.] in CAAR $InteractiveFrame repeat
    x := get(a,'value,$InteractiveFrame) =>
      putHist(a,'value,x,$InteractiveFrame)
    x := get(a,'mode,$InteractiveFrame) =>
      putHist(a,'mode,x,$InteractiveFrame)
  NIL

SPADRREAD(vec, stream) ==
    dewritify rread(vec, stream, nil)

--% Lisplib output transformations
--  Some types of objects cannot be saved by LISP/VM in lisplibs.
--  These functions transform an object to a writable form and back.
--  SMW
SPADRWRITE(vec, item, stream) ==
  val := SPADRWRITE0(vec, item, stream) 
  val = 'writifyFailed =>
    throwKeyedMsg("S2IH0036", nil) -- cannot save value to file
  item

SPADRWRITE0(vec, item, stream) ==
    val := safeWritify item
    val = 'writifyFailed => val
    rwrite(vec, val, stream)
    item

safeWritify ob ==
  CATCH('writifyTag,  writify ob)

writify ob ==
    not ScanOrPairVec(function(unwritable?), ob) => ob
    $seen:     local := MAKE_-HASHTABLE 'EQ
    $writifyComplained: local := false
 
    writifyInner ob where
        writifyInner ob ==
            null ob                => nil
            (e := HGET($seen, ob)) => e
 
            PAIRP ob =>
                qcar := QCAR ob
                qcdr := QCDR ob
                (name := spadClosure? ob) =>
                   d := writifyInner QCDR ob
                   nob := ['WRITIFIED_!_!, 'SPADCLOSURE, d, name]
                   HPUT($seen, ob, nob)
                   HPUT($seen, nob, nob)
                   nob
                (ob is ['LAMBDA_-CLOSURE, ., ., x, :.]) and x =>
                  THROW('writifyTag, 'writifyFailed)
                nob := CONS(qcar, qcdr)
                HPUT($seen, ob, nob)
                HPUT($seen, nob, nob)
                qcar := writifyInner qcar
                qcdr := writifyInner qcdr
                QRPLACA(nob, qcar)
                QRPLACD(nob, qcdr)
                nob
            VECP ob =>
                isDomainOrPackage ob =>
                    d := mkEvalable devaluate ob
                    nob := ['WRITIFIED_!_!, 'DEVALUATED, writifyInner d]
                    HPUT($seen, ob, nob)
                    HPUT($seen, nob, nob)
                    nob
                n   := QVMAXINDEX ob
                nob := MAKE_-VEC(n+1)
                HPUT($seen, ob, nob)
                HPUT($seen, nob, nob)
                for i in 0..n repeat
                    QSETVELT(nob, i, writifyInner QVELT(ob,i))
                nob
            ob = 'WRITIFIED_!_! =>
                ['WRITIFIED_!_!, 'SELF]
            -- In CCL constructors are also compiled functions, so we 
            -- need this line:
            constructor? ob => ob
            COMPILED_-FUNCTION_-P ob =>
                THROW('writifyTag, 'writifyFailed)
            HASHTABLEP ob =>
                nob := ['WRITIFIED_!_!]
                HPUT($seen, ob,  nob)
                HPUT($seen, nob, nob)
                keys := HKEYS ob
                QRPLACD(nob,
                        ['HASHTABLE,
                          HASHTABLE_-CLASS ob,
                            writifyInner keys,
                              [writifyInner HGET(ob,k) for k in keys]])
                nob
            PLACEP ob =>
                nob := ['WRITIFIED_!_!, 'PLACE]
                HPUT($seen, ob,  nob)
                HPUT($seen, nob, nob)
                nob
            -- The next three types cause an error on de-writifying.
            -- Create an object of the right shape, nonetheless.
            READTABLEP ob =>
                THROW('writifyTag, 'writifyFailed)
            -- Default case: return the object itself.
            STRINGP ob =>
                EQ(ob, $NullStream) => ['WRITIFIED_!_!, 'NULLSTREAM]
                EQ(ob, $NonNullStream) => ['WRITIFIED_!_!, 'NONNULLSTREAM]
                ob
            FLOATP ob =>
                ob = READ_-FROM_-STRING STRINGIMAGE ob => ob
                ['WRITIFIED_!_!, 'FLOAT, ob,:
                   MULTIPLE_-VALUE_-LIST INTEGER_-DECODE_-FLOAT ob]
            ob


unwritable? ob ==
    PAIRP  ob or VECP ob       => false   -- first for speed
    COMPILED_-FUNCTION_-P   ob or HASHTABLEP ob => true
    PLACEP ob or READTABLEP ob => true
    FLOATP ob => true
    false

-- Create a full isomorphic object which can be saved in a lisplib.
-- Note that  dewritify(writify(x))  preserves UEQUALity of hashtables.
-- HASHTABLEs go both ways.
-- READTABLEs cannot presently be transformed back.
 
writifyComplain s ==
   $writifyComplained  = true => nil
   $writifyComplained := true
   sayKeyedMsg("S2IH0027",[s]) 

spadClosure? ob ==
  fun := QCAR ob
  not (name := BPINAME fun) => nil
  vec := QCDR ob
  not VECP vec => nil
  name

dewritify ob ==
    (not ScanOrPairVec(function is?, ob)
            where  is? a == a = 'WRITIFIED_!_!) => ob
 
    $seen:     local := MAKE_-HASHTABLE 'EQ
 
    dewritifyInner ob where
        dewritifyInner ob ==
            null ob => nil
            e := HGET($seen, ob) => e
 
            PAIRP ob and CAR ob = 'WRITIFIED_!_! =>
                type := ob.1
                type = 'SELF =>
                    'WRITIFIED_!_!
                type = 'BPI =>
                    oname := ob.2
                    f :=
                        INTP oname => EVAL GENSYMMER oname
                        SYMBOL_-FUNCTION oname
                    not COMPILED_-FUNCTION_-P f =>
                        error '"A required BPI does not exist."
                    #ob > 3 and HASHEQ f ^= ob.3 =>
                        error '"A required BPI has been redefined."
                    HPUT($seen, ob, f)
                    f
                type = 'HASHTABLE =>
                    nob := MAKE_-HASHTABLE ob.2
                    HPUT($seen, ob, nob)
                    HPUT($seen, nob, nob)
                    for k in ob.3 for e in ob.4 repeat
                        HPUT(nob, dewritifyInner k, dewritifyInner e)
                    nob
                type = 'DEVALUATED =>
                    nob := EVAL dewritifyInner ob.2
                    HPUT($seen, ob, nob)
                    HPUT($seen, nob, nob)
                    nob
                type = 'SPADCLOSURE =>
                    vec := dewritifyInner ob.2
                    name := ob.3
                    not FBOUNDP name => 
                       error STRCONC('"undefined function: ", SYMBOL_-NAME name)
                    nob := CONS(SYMBOL_-FUNCTION name, vec)
                    HPUT($seen, ob, nob)
                    HPUT($seen, nob, nob)
                    nob
                type = 'PLACE =>
                    nob := VMREAD MAKE_-INSTREAM NIL
                    HPUT($seen, ob, nob)
                    HPUT($seen, nob, nob)
                    nob
                type = 'READTABLE =>
                    error '"Cannot de-writify a read table."
                type = 'NULLSTREAM => $NullStream
                type = 'NONNULLSTREAM => $NonNullStream
                type = 'FLOAT =>
                   [fval, signif, expon, sign] := CDDR ob
                   fval := SCALE_-FLOAT( FLOAT(signif, fval), expon)
                   sign<0 => -fval
                   fval
                error '"Unknown type to de-writify."
 
            PAIRP ob =>
                qcar := QCAR ob
                qcdr := QCDR ob
                nob  := CONS(qcar, qcdr)
                HPUT($seen, ob, nob)
                HPUT($seen, nob, nob)
                QRPLACA(nob, dewritifyInner qcar)
                QRPLACD(nob, dewritifyInner qcdr)
                nob
            VECP ob =>
                n   := QVMAXINDEX ob
                nob := MAKE_-VEC(n+1)
                HPUT($seen, ob, nob)
                HPUT($seen, nob, nob)
                for i in 0..n repeat
                    QSETVELT(nob, i, dewritifyInner QVELT(ob,i))
                nob
            -- Default case: return the object itself.
            ob

ScanOrPairVec(f, ob) ==
    $seen:     local := MAKE_-HASHTABLE 'EQ
 
    CATCH('ScanOrPairVecAnswer, ScanOrInner(f, ob)) where
        ScanOrInner(f, ob) ==
            HGET($seen, ob) => nil
            PAIRP ob =>
                HPUT($seen, ob, true)
                ScanOrInner(f, QCAR ob)
                ScanOrInner(f, QCDR ob)
                nil
            VECP ob =>
                HPUT($seen, ob, true)
                for i in 0..#ob-1 repeat ScanOrInner(f, ob.i)
                nil
            FUNCALL(f, ob) =>
                THROW('ScanOrPairVecAnswer, true)
            nil





--% )load

load args == loadSpad2Cmd args

loadSpad2Cmd args ==
    sayKeyedMsg("S2IU0003", nil)
    NIL
--  load1(args,$forceDatabaseUpdate)

--load1(args,$forceDatabaseUpdate) ==  -- $ var is now local
--  null args => helpSpad2Cmd '(load)
--  loadfun := 'loadLib
--  justWondering := nil
--  compiler := 'old
--  doExpose := true
--  $forceDatabaseUpdate := true  -- BMT request, 5/14/90
--  for [opt,:.] in $options repeat
--    fullopt := selectOptionLC(opt,
--      '(cond update query new noexpose noupdate),
--        'optionError)
--    fullopt = 'cond     => loadfun := 'loadLibIfNotLoaded
--    fullopt = 'query    => justWondering := true
--    fullopt = 'update   => $forceDatabaseUpdate := true
--    fullopt = 'noexpose => doExpose := false
--    fullopt = 'noupdate => $forceDatabaseUpdate := false
--  if $forceDatabaseUpdate then clearClams()
--  for lib in args repeat
--    lib := object2Identifier lib
--    justWondering =>
--      GETL(lib,'LOADED) => sayKeyedMsg("S2IZ0028",[lib])
--      sayKeyedMsg("S2IZ0029",[lib])
--    null GETDATABASE(lib,'OBJECT) and
--     null (lib := GETDATABASE(lib,'CONSTRUCTOR)) =>
--      sayKeyedMsg("S2IL0020", [namestring [lib,$spadLibFT,"*"]])
--    null FUNCALL(loadfun,lib) =>
--      sayKeyedMsg("S2IZ0029",[lib])
--    sayKeyedMsg("S2IZ0028",[lib])
--    if doExpose and
--       not isExposedConstructor(lib) then
--          setExposeAddConstr([lib])
--  'EndOfLoad

reportCount () ==
  centerAndHighlight(" Current Count Settings ",$LINELENGTH,specialChar 'hbar)
  SAY " "
  sayBrightly [:bright " cache",fillerSpaces(30,'".")," ",$cacheCount]
  if $cacheAlist then
    for [a,:b] in $cacheAlist repeat
      aPart:= linearFormatName a
      n:= sayBrightlyLength aPart
      sayBrightly concat("     ",aPart," ",fillerSpaces(32-n,'".")," ",b)
  SAY " "
  sayBrightly [:bright " stream",fillerSpaces(29,'".")," ",$streamCount]

--% )quit

pquit() == pquitSpad2Cmd()

pquitSpad2Cmd() ==
  $saturn =>
    sayErrorly('"Obsolete system command", _
      ['" The )pquit system command is obsolete in this version of AXIOM.",
       '" Please select Exit from the File Menu instead."])
  $quitCommandType :local := 'protected
  quitSpad2Cmd()

quit() == quitSpad2Cmd()

quitSpad2Cmd() ==
  $saturn =>
    sayErrorly('"Obsolete system command", _
      ['" The )quit system command is obsolete in this version of AXIOM.",
       '" Please select Exit from the File Menu instead."])
  $quitCommandType ^= 'protected => leaveScratchpad()
  x := UPCASE queryUserKeyedMsg("S2IZ0031",NIL)
  MEMQ(STRING2ID_-N(x,1),'(Y YES)) => leaveScratchpad()
  sayKeyedMsg("S2IZ0032",NIL)
  TERSYSCOMMAND ()

leaveScratchpad () == BYE()

--% )read

read l == readSpad2Cmd l

readSpad2Cmd l ==
  ---$saturn =>
  ---  sayErrorly('"Obsolete system command", _
  ---    ['" The )read  system command is obsolete in this version of AXIOM.",
  ---     '" Please use Open from the File menu instead."])
  $InteractiveMode : local := true
  quiet := nil
  ifthere := nil
  for [opt,:.] in $options repeat
    fullopt := selectOptionLC(opt,'(quiet test ifthere),'optionError)
    fullopt = 'ifthere => ifthere  := true
    fullopt = 'quiet   => quiet := true

  ef := pathname _/EDITFILE
  if pathnameTypeId(ef) = 'SPAD then
    ef := makePathname(pathnameName ef,'"*",'"*")
  if l then
    l := mergePathnames(pathname l,ef)
  else
    l := ef
  devFTs := '("input" "INPUT" "boot" "BOOT" "lisp" "LISP")
  fileTypes :=
    $UserLevel = 'interpreter => '("input" "INPUT")
    $UserLevel = 'compiler    => '("input" "INPUT")
    devFTs
  ll := $FINDFILE (l, fileTypes)
  if null ll then
    ifthere => return nil    -- be quiet about it
    throwKeyedMsg("S2IL0003",[namestring l])
  ll := pathname ll
  ft := pathnameType ll
  upft := UPCASE ft
  null member(upft,fileTypes) =>
    fs := namestring l
    member(upft,devFTs) => throwKeyedMsg("S2IZ0033",[fs])
    throwKeyedMsg("S2IZ0034",[fs])
  SETQ(_/EDITFILE,ll)
  if upft = '"BOOT" then $InteractiveMode := nil
  _/READ(ll,quiet)

--% )savesystem
savesystem l ==
  #l ^= 1 or not(SYMBOLP CAR l) => helpSpad2Cmd '(savesystem)
  SPAD_-SAVE SYMBOL_-NAME CAR l

--% )show

show l == showSpad2Cmd l

showSpad2Cmd l ==
  l = [NIL] => helpSpad2Cmd '(show)
  $showOptions : local := '(attributes operations)
  if null $options then $options := '((operations))
  $e : local := $InteractiveFrame
  $env : local := $InteractiveFrame
  l is [constr] =>
    constr in '(Union Record Mapping) =>
      constr = 'Record =>
        sayKeyedMsg("S2IZ0044R",[constr, '")show Record(a: Integer, b: String)"])
      constr = 'Mapping =>
        sayKeyedMsg("S2IZ0044M",NIL)
      sayKeyedMsg("S2IZ0045T",[constr, '")show Union(a: Integer, b: String)"])
      sayKeyedMsg("S2IZ0045U",[constr, '")show Union(Integer, String)"])
    constr is ['Mapping, :.] =>
      sayKeyedMsg("S2IZ0044M",NIL)
    reportOperations(constr,constr)
  reportOperations(l,l)

reportOperations(oldArg,u) ==
  -- u might be an uppercased version of oldArg
  $env:local := [[nil]]
  $eval:local := true           --generate code-- don't just type analyze
  $genValue:local := true       --evaluate all generated code
  null u => nil
  $doNotAddEmptyModeIfTrue: local:= true
  u = $quadSymbol =>
     sayBrightly ['"   mode denotes", :bright '"any", "type"]
  u = "%" =>
    sayKeyedMsg("S2IZ0063",NIL)
    sayKeyedMsg("S2IZ0064",NIL)
  u isnt ['Record,:.] and u isnt ['Union,:.] and
    null(isNameOfType u) and u isnt ['typeOf,.] =>
      if ATOM oldArg then oldArg := [oldArg]
      sayKeyedMsg("S2IZ0063",NIL)
      for op in oldArg repeat
        sayKeyedMsg("S2IZ0062",[opOf op])
  (v := isDomainValuedVariable u) =>  reportOpsFromUnitDirectly0 v
  unitForm:=
    atom u => opOf unabbrev u
    unabbrev u
  atom unitForm => reportOpsFromLisplib0(unitForm,u)
  unitForm' := evaluateType unitForm
  tree := mkAtree removeZeroOneDestructively unitForm
  (unitForm' := isType tree) => reportOpsFromUnitDirectly0 unitForm'
  sayKeyedMsg("S2IZ0041",[unitForm])

reportOpsFromUnitDirectly0 D ==
  $useEditorForShowOutput =>
    reportOpsFromUnitDirectly1 D
  reportOpsFromUnitDirectly D

reportOpsFromUnitDirectly1 D ==
  showFile := pathname ['SHOW,'LISTING,$listingDirectory]
  _$ERASE showFile
  $sayBrightlyStream : fluid :=
    DEFIOSTREAM([['FILE,:showFile], '(MODE . OUTPUT)],255,0)
  sayShowWarning()
  reportOpsFromUnitDirectly D
  SHUT $sayBrightlyStream
  editFile showFile

sayShowWarning() ==
  sayBrightly
    '"Warning: this is a temporary file and will be deleted the next"
  sayBrightly
    '"         time you use )show. Rename it and FILE if you wish to"
  sayBrightly
    '"         save the contents."
  sayBrightly '""

reportOpsFromLisplib0(unitForm,u)  ==
  $useEditorForShowOutput => reportOpsFromLisplib1(unitForm,u)
  reportOpsFromLisplib(unitForm,u)

reportOpsFromLisplib1(unitForm,u)  ==
  showFile := pathname ['SHOW,'LISTING,$listingDirectory]
  _$ERASE showFile
  $sayBrightlyStream : fluid :=
    DEFIOSTREAM([['FILE,:showFile], '(MODE . OUTPUT)],255,0)
  sayShowWarning()
  reportOpsFromLisplib(unitForm,u)
  SHUT $sayBrightlyStream
  editFile showFile

reportOpsFromUnitDirectly unitForm ==
  isRecordOrUnion := unitForm is [a,:.] and a in '(Record Union)
  unit:= evalDomain unitForm
  top:= CAR unitForm
  kind:= GETDATABASE(top,'CONSTRUCTORKIND)

  sayBrightly concat('%b,formatOpType unitForm,
    '%d,'"is a",'%b,kind,'%d, '"constructor.")
  if not isRecordOrUnion then
    abb := GETDATABASE(top,'ABBREVIATION)
    sourceFile := GETDATABASE(top,'SOURCEFILE)
    sayBrightly ['" Abbreviation for",:bright top,'"is",:bright abb]
    verb :=
      isExposedConstructor top => '"is"
      '"is not"
    sayBrightly ['" This constructor",:bright verb,
      '"exposed in this frame."]
    sayBrightly ['" Issue",:bright STRCONC('")edit ",
      namestring sourceFile),'"to see algebra source code for",
        :bright abb,'%l]

  for [opt] in $options repeat
    opt := selectOptionLC(opt,$showOptions,'optionError)
    opt = 'attributes =>
      centerAndHighlight('"Attributes",$LINELENGTH,specialChar 'hbar)
      isRecordOrUnion =>
        sayBrightly '"   Records and Unions have no attributes."
      sayBrightly '""
      attList:= REMDUP MSORT [x for [x,:.] in unit.2]
      say2PerLine [formatAttribute x for x in attList]
      NIL
    opt = 'operations =>
      $commentedOps: local := 0
      --new form is (<op> <signature> <slotNumber> <condition> <kind>)
      centerAndHighlight('"Operations",$LINELENGTH,specialChar 'hbar)
      sayBrightly '""
      if isRecordOrUnion
        then
          constructorFunction:= GETL(top,"makeFunctionList") or
            systemErrorHere '"reportOpsFromUnitDirectly"
          [funlist,.]:= FUNCALL(constructorFunction,"$",unitForm,
            $CategoryFrame)
          sigList := REMDUP MSORT [[[a,b],true,[c,0,1]] for
            [a,b,c] in funlist]
        else
          sigList:= REMDUP MSORT getOplistForConstructorForm unitForm
      say2PerLine [formatOperation(x,unit) for x in sigList]
      if $commentedOps ^= 0 then
        sayBrightly
          ['"Functions that are not yet implemented are preceded by",
            :bright '"--"]
      sayBrightly '""
  NIL

reportOpsFromLisplib(op,u) ==
  null(fn:= constructor? op) => sayKeyedMsg("S2IZ0054",[u])
  argml :=
    (s := getConstructorSignature op) => KDR s
    NIL
  typ:= GETDATABASE(op,'CONSTRUCTORKIND)
  nArgs:= #argml
  argList:= KDR GETDATABASE(op,'CONSTRUCTORFORM)
  functorForm:= [op,:argList]
  argml:= EQSUBSTLIST(argList,$FormalMapVariableList,argml)
  functorFormWithDecl:= [op,:[[":",a,m] for a in argList for m in argml]]
  sayBrightly concat(bright form2StringWithWhere functorFormWithDecl,
                     '" is a",bright typ,'"constructor")
  sayBrightly ['" Abbreviation for",:bright op,'"is",:bright fn]
  verb :=
    isExposedConstructor op => '"is"
    '"is not"
  sayBrightly ['" This constructor",:bright verb,
    '"exposed in this frame."]
  sourceFile := GETDATABASE(op,'SOURCEFILE)
  sayBrightly ['" Issue",:bright STRCONC('")edit ",
    namestring sourceFile),
      '"to see algebra source code for",:bright fn,'%l]

  for [opt] in $options repeat
    opt := selectOptionLC(opt,$showOptions,'optionError)
    opt = 'layout =>
      dc1 fn
    opt = 'views => sayBrightly ['"To get",:bright '"views",
      '"you must give parameters of constructor"]
    opt = 'attributes =>
      centerAndHighlight('"Attributes",$LINELENGTH,specialChar 'hbar)
      sayBrightly '""
      attList:= REMDUP MSORT [x for [x,:.] in
        GETDATABASE(op,'ATTRIBUTES)]
      null attList => sayBrightly
        concat('%b,form2String functorForm,'%d,"has no attributes.",'%l)
      say2PerLine [formatAttribute x for x in attList]
      NIL
    opt = 'operations => displayOperationsFromLisplib functorForm
    nil

displayOperationsFromLisplib form ==
  [name,:argl] := form
  kind := GETDATABASE(name,'CONSTRUCTORKIND)
  centerAndHighlight('"Operations",$LINELENGTH,specialChar 'hbar)
  opList:= GETDATABASE(name,'OPERATIONALIST)
  null opList => 
    centerAndHighlight('"No exported operations",$LINELENGTH)
  opl:=REMDUP MSORT EQSUBSTLIST(argl,$FormalMapVariableList,opList)
  ops:= nil
  for x in opl repeat
    ops := [:ops,:formatOperationAlistEntry(x)]
  say2PerLine ops
  nil

--% )spool

clearHighlight() ==
  $saveHighlight := $highlightAllowed
  $highlightAllowed := false
  $saveSpecialchars := $specialCharacters
  setOutputCharacters ["plain"]

resetHighlight() ==
  $highlightAllowed := $saveHighlight
  $specialCharacters := $saveSpecialchars

spool filename ==
  null filename =>
    DRIBBLE()
    TERPRI()
    resetHighlight()
  PROBE_-FILE car filename =>
    systemError CONCAT('"file ", STRING car filename, '" already exists")
  DRIBBLE car filename
  TERPRI()
  clearHighlight()

--% )synonym

synonym(:l) == synonymSpad2Cmd()  -- always passed a null list

synonymSpad2Cmd() ==
  line := getSystemCommandLine()
  if line = '"" then printSynonyms(NIL)
  else
    pair := processSynonymLine line
    if $CommandSynonymAlist then
      PUTALIST($CommandSynonymAlist,CAR pair, CDR pair)
    else $CommandSynonymAlist := [pair]
  terminateSystemCommand()

processSynonymLine line ==
  key := STRING2ID_-N (line, 1)
  value := removeKeyFromLine line where
    removeKeyFromLine line ==
      line := dropLeadingBlanks line
      mx := MAXINDEX line
      for i in 0..mx repeat
        line.i = " " =>
          return (for j in (i+1)..mx repeat
            line.j ^= " " => return (SUBSTRING (line, j, nil)))
  [key, :value]


--%
--% )undo
--%

$undoFlag := true     --Default setting for undo is "on"

++ true means means we report the steps undo takes
$reportUndo := false


undo(l) ==
--undo takes one option ")redo" which simply reads "redo.input",
--  a file created by every normal )undo command (see below)
  undoWhen := 'after
  if $options is [[key]] then
    stringPrefix?(s := PNAME key,'"redo") =>
      $options := nil           --clear $options so that "read" won't see them
      read '(redo_.input)
    not stringPrefix?(s,'"before") =>
       userError '"only option to undo is _")redo_""
    undoWhen := 'before
  n :=
    null l => -1
    first l
  if IDENTP n then
    n := PARSE_-INTEGER PNAME n
    if not FIXP n then userError '"undo argument must be an integer"
  $InteractiveFrame := undoSteps(undoCount n,undoWhen)
  nil

recordFrame(systemNormal) ==
  null $undoFlag => nil        --do nothing if facility is turned off
  currentAlist := KAR $frameRecord
  delta := diffAlist(CAAR $InteractiveFrame,$previousBindings)
  if systemNormal = 'system then
    null delta => return nil     --do not record
    delta := ['systemCommand,:delta]
  $frameRecord := [delta,:$frameRecord]
  $previousBindings := --copy all but the individual properties
    [CONS(CAR x,[CONS(CAR y,CDR y) for y in CDR x]) for x in CAAR $InteractiveFrame]
  first $frameRecord

diffAlist(new,old) ==
--record only those properties which are different
  for (pair := [name,:proplist]) in new repeat
    -- name has an entry both in new and old world
    -- (1) if the old world had no proplist for that variable, then
    --     record NIL as the value of each new property
    -- (2) if the old world does have a proplist for that variable, then
    --     a) for each property with a value: give the old value
    --     b) for each property missing:      give NIL as the old value
    oldPair := ASSQ(name,old) =>
      null (oldProplist := CDR oldPair) =>
      --record old values of new properties as NIL
        acc := [[name,:[[prop] for [prop,:.] in proplist]],:acc]
      deltas := nil
      for (propval := [prop,:val]) in proplist repeat
        null (oldPropval := assoc(prop,oldProplist)) => --missing property
          deltas := [[prop],:deltas]
        EQ(CDR oldPropval,val) => 'skip
        deltas := [oldPropval,:deltas]
      deltas => acc := [[name,:NREVERSE deltas],:acc]
    acc := [[name,:[[prop] for [prop,:.] in proplist]],:acc]
--record properties absent on new list (say, from a )cl all)
  for (oldPair := [name,:r]) in old repeat
    r and null LASSQ(name,new) =>
      acc := [oldPair,:acc]
    -- name has an entry both in new and old world
    -- (1) if the new world has no proplist for that variable
    --     (a) if the old world does, record the old proplist
    --     (b) if the old world does not, record nothing
    -- (2) if the new world has a proplist for that variable, it has
    --     been handled by the first loop.
  res := NREVERSE acc
  if $reportUndo then reportUndo res
  res

reportUndo acc ==
  for [name,:proplist] in acc repeat
    sayBrightly STRCONC("Properties of ",PNAME name,'" ::")
    curproplist := LASSOC(name,CAAR $InteractiveFrame)
    for [prop,:value] in proplist repeat
      sayBrightlyNT ['"  ",prop,'" was: "]
      pp value
      sayBrightlyNT ['"  ",prop,'" is:  "]
      pp LASSOC(prop,curproplist)

clearFrame() ==
  clearCmdAll()
  $frameRecord := nil
  $previousBindings := nil


--=======================================================================
--              Undoing previous m commands
--=======================================================================
undoCount(n) ==  --computes the number of undo's, given $IOindex
--pp ["IOindex = ",$IOindex]
  m :=
    n >= 0 => $IOindex - n - 1
    -n
  m >= $IOindex => userError STRCONC('"Magnitude of undo argument must be less than step number (",STRINGIMAGE $IOindex,'").")
  m


undoSteps(m,beforeOrAfter) ==
-- undoes m previous commands; if )before option, then undo one extra at end
--Example: if $IOindex now is 6 and m = 2 then general layout of $frameRecord,
--  after the call to recordFrame below will be:
--  (<change for systemcommands>
--  (<change for #5> <change for system commands>
--  (<change for #4> <change for system commands>
--  (<change for #3> <change for system commands>
--   <change for #2> <change for system commands>
--   <change for #1> <change for system commands>) where system
--  command entries are optional and identified by (systemCommand . change).
--  For a ")undo 3 )after", m = 2 and undoStep swill restore the environment
--  up to, but not including <change for #3>.
--  An "undo 3 )before" will additionally restore <change for #3>.
--  Thus, the later requires one extra undo at the end.
  writeInputLines('redo,$IOindex - m)
  recordFrame('normal)  --do NOT mark this as a system command change
                       --do this undo FIRST (i=0 case)
  env := COPY CAAR $InteractiveFrame
  for i in 0..m for framelist in tails $frameRecord repeat
    env := undoSingleStep(first framelist,env)
    framelist is [.,['systemCommand,:systemDelta],:.] =>
--     pp '"===============> AHA <============="
       framelist := rest framelist             --undoing system commands given
       env := undoSingleStep(systemDelta,env)  --  before command line
    lastTailSeen := framelist
  if beforeOrAfter = 'before then  --do one additional undo for )before
    env := undoSingleStep(first rest lastTailSeen,env)
  $frameRecord := rest $frameRecord --flush the effect of extra recordFrame
  $InteractiveFrame := LIST LIST env


undoSingleStep(changes,env) ==
--Each change is a name-proplist pair. For each change:
--  (1) if there exists a proplist in env, then for each prop-value change:
--      (a) if the prop exists in env, RPLAC in the change value
--      (b) otherwise, CONS it onto the front of prop-values for that name
--  (2) add change to the front of env
--  pp '"----Undoing 1 step--------"
--  pp changes
  for (change := [name,:changeList]) in changes repeat
    if LASSOC('localModemap,changeList) then
      changeList := undoLocalModemapHack changeList
    pairlist := ASSQ(name,env) =>
      proplist := CDR pairlist =>
        for (pair := [prop,:value]) in changeList repeat
          node := ASSQ(prop,proplist) => RPLACD(node,value)
          RPLACD(proplist,[CAR proplist,:CDR proplist])
          RPLACA(proplist,pair)
      RPLACD(pairlist,changeList)
    env := [change,:env]
  env

undoLocalModemapHack changeList ==
  [newPair for (pair := [name,:value]) in changeList | newPair] where newPair()  ==
     name = 'localModemap => [name]
     pair

removeUndoLines u == --called by writeInputLines
  xtra :=
    STRINGP $currentLine => [$currentLine]
    REVERSE $currentLine
  xtra := [x for x in xtra | not stringPrefix?('")history",x)]
  u := [:u, :xtra]
  not (or/[stringPrefix?('")undo",x) for x in u])  => u
  --(1) reverse the list
  --(2) walk down the (reversed) list: when >n appears remove:
  --    (a) system commands
  --    (b) if n > 0: (replace n by n-1; remove a command; repeat (a-b))
  savedIOindex := $IOindex  --save value
  $IOindex := 1
  for y in tails u repeat
    (x := first y).0 = char '_) =>
      stringPrefix?('")undo",s := trimString x) => --parse "undo )option"
        s1 := trimString SUBSTRING(s,5,nil)
        if s1 ^= '")redo" then
          m := charPosition(char '_),s1,0)
          code :=
            m < MAXINDEX s1 => s1.(m + 1)
            char 'a
          s2 := trimString SUBSTRING(s1,0,m)
        n :=
           s1 = '")redo" => 0
           s2 ^= '"" => undoCount PARSE_-INTEGER s2
           -1
        RPLACA(y,CONCAT('">",code,STRINGIMAGE n))
      nil
    $IOindex := $IOindex + 1   --referenced by undoCount
  acc := nil
  for y in tails NREVERSE u repeat
    (x := first y).0 = char '_> =>
      code := x . 1                                 --code = a,b, or r
      n := PARSE_-INTEGER SUBSTRING(x,2,nil)        --n = number of undo steps
      y := rest y                                   --kill >n line
      while y repeat
        c := first y
        c.0 = char '_) or c.0 = char '_> => y := rest y  --kill system commands
        n = 0 => return nil                              --including undos
        n := n - 1
        y := rest y                                 --kill command
      y and code^= char 'b => acc := [c,:acc]       --add last unless )before
    acc := [x,:acc]
  $IOindex := savedIOindex
  acc




--% )what


what l == whatSpad2Cmd l

whatSpad2Cmd l ==
  $e:local := $EmptyEnvironment
  null l => reportWhatOptions()
  [key0,:args] := l
  key := selectOptionLC(key0,$whatOptions,nil)
  null key => sayKeyedMsg("S2IZ0043",NIL)
  args := [fixpat p for p in args] where
    fixpat x ==
      x is [x',:.] => DOWNCASE x'
      DOWNCASE x
  key = 'things =>
    for opt in $whatOptions repeat
      not MEMQ(opt,'(things)) => whatSpad2Cmd [opt,:args]
  key = 'categories =>
    filterAndFormatConstructors('category,'"Categories",args)
  key = 'commands =>
    whatCommands(args)
  key = 'domains =>
    filterAndFormatConstructors('domain,'"Domains",args)
  key = 'operations =>
    apropos args
  key = 'packages =>
    filterAndFormatConstructors('package,'"Packages",args)
  key = 'synonyms =>
    printSynonyms(args)

filterAndFormatConstructors(constrType,label,patterns) ==
  centerAndHighlight(label,$LINELENGTH,specialChar 'hbar)
  l := filterListOfStringsWithFn(patterns,whatConstructors constrType,
        function CDR)
  if patterns then
    null l =>
      sayMessage ['"   No ",label,'" with names matching patterns:",
        '%l,'"   ",'%b,:blankList patterns,'%d]
    sayMessage [label,'" with names matching patterns:",
      '%l,'"   ",'%b,:blankList patterns,'%d]
  l => pp2Cols l

whatConstructors constrType ==
  -- here constrType should be one of 'category, 'domain, 'package
  MSORT [CONS(GETDATABASE(con,'ABBREVIATION), STRING(con))
    for con in allConstructors()
      | GETDATABASE(con,'CONSTRUCTORKIND) = constrType]

apropos l ==
  -- l is a list of operation name fragments
  -- this displays all operation names containing these fragments
  ops :=
    null l => allOperations()
    filterListOfStrings([(DOWNCASE STRINGIMAGE p) for p in l],allOperations())
  ops =>
    sayMessage '"Operations whose names satisfy the above pattern(s):"
    sayAsManyPerLineAsPossible MSORT ops
    sayKeyedMsg("S2IF0011",[first ops])
  sayMessage '"   There are no operations containing those patterns"
  NIL


printSynonyms(patterns) ==
  centerAndHighlight("System Command Synonyms",$LINELENGTH,specialChar 'hbar)
  ls := filterListOfStringsWithFn(patterns, [[STRINGIMAGE a,:eval b]
    for [a,:b] in synonymsForUserLevel $CommandSynonymAlist],
      function CAR)
  printLabelledList(ls,'"user",'"synonyms",'")",patterns)
  nil

printLabelledList(ls,label1,label2,prefix,patterns) ==
  -- prefix goes before each element on each side of the list, eg,
  --   ")"
  null ls =>
    null patterns =>
      sayMessage ['"   No ",label1,'"-defined ",label2,'" in effect."]
    sayMessage ['"   No ",label1,'"-defined ",label2,'" satisfying patterns:",
     '%l,'"     ",'%b,:blankList patterns,'%d]
  if patterns then
    sayMessage [label1,'"-defined ",label2,'" satisfying patterns:",
     '%l,'"   ",'%b,:blankList patterns,'%d]
  for [syn,:comm] in ls repeat
    if SUBSTRING(syn,0,1) = '"|" then syn := SUBSTRING(syn,1,NIL)
    if syn = '"%i" then syn := '"%i "
    wid := MAX(30 - (entryWidth syn),1)
    sayBrightly concat('%b,prefix,syn,'%d,
      fillerSpaces(wid,'"."),'" ",prefix,comm)
  sayBrightly '""

whatCommands(patterns) ==
  label := STRCONC("System Commands for User Level: ",
    STRINGIMAGE $UserLevel)
  centerAndHighlight(label,$LINELENGTH,specialChar 'hbar)
  l := filterListOfStrings(patterns,
    [(STRINGIMAGE a) for a in commandsForUserLevel $systemCommands])
  if patterns then
    null l =>
      sayMessage ['"No system commands at this level matching patterns:",
        '%l,'"   ",'%b,:blankList patterns,'%d]
    sayMessage ['"System commands at this level matching patterns:",
      '%l,'"   ",'%b,:blankList patterns,'%d]
  if l then
    sayAsManyPerLineAsPossible l
    SAY " "
  patterns => nil  -- don't be so verbose
  sayKeyedMsg("S2IZ0046",NIL)
  nil

reportWhatOptions() ==
  optList1:= "append"/[['%l,'"        ",x] for x in $whatOptions]
  sayBrightly
    ['%b,'"  )what",'%d,'"argument keywords are",'%b,:optList1,'%d,'%l,
      '"   or abbreviations thereof.",'%l,
        '%l,'"   Issue",'%b,'")what ?",'%d,'"for more information."]

filterListOfStrings(patterns,names) ==
  -- names and patterns are lists of strings
  -- returns: list of strings in names that contains any of the strings
  -- in patterns
  (null patterns) or (null names) => names
  names' := NIL
  for name in reverse names repeat
    satisfiesRegularExpressions(name,patterns) =>
      names' := [name,:names']
  names'

filterListOfStringsWithFn(patterns,names,fn) ==
  -- names and patterns are lists of strings
  -- fn is something like CAR or CADR
  -- returns: list of strings in names that contains any of the strings
  -- in patterns
  (null patterns) or (null names) => names
  names' := NIL
  for name in reverse names repeat
    satisfiesRegularExpressions(FUNCALL(fn,name),patterns) =>
      names' := [name,:names']
  names'

satisfiesRegularExpressions(name,patterns) ==
  -- this is a first cut
  nf := true
  dname := DOWNCASE COPY name
  for pattern in patterns while nf repeat
    -- use @ as a wildcard
    STRPOS(pattern,dname,0,'"@") => nf := nil
  null nf

--% )with ... defined in daase.lisp (boot won't parse it)

--% )workfiles

workfiles l == workfilesSpad2Cmd l

workfilesSpad2Cmd args ==
  args => throwKeyedMsg("S2IZ0047",NIL)
  deleteFlag := nil
  for [type,:.] in $options repeat
    type1 := selectOptionLC(type,'(boot lisp meta delete),nil)
    null type1 => throwKeyedMsg("S2IZ0048",[type])
    type1 = 'delete => deleteFlag := true
  for [type,:flist] in $options repeat
    type1 := selectOptionLC(type,'(boot lisp meta delete),nil)
    type1 = 'delete => nil
    for file in flist repeat
      fl := pathname [file,type1,'"*"]
      deleteFlag => SETQ($sourceFiles,delete(fl,$sourceFiles))
      null (MAKE_-INPUT_-FILENAME fl) => sayKeyedMsg("S2IZ0035",[namestring fl])
      updateSourceFiles fl
  SAY " "
  centerAndHighlight(" User-specified work files ",$LINELENGTH,specialChar 'hbar)
  SAY " "
  null $sourceFiles => SAY '"   no files specified"
  SETQ($sourceFiles,SORTBY('pathnameType,$sourceFiles))
  for fl in $sourceFiles repeat sayBrightly ["   " ,namestring fl]

--% )zsystemdevelopment

zsystemdevelopment l == zsystemDevelopmentSpad2Cmd l

zsystemDevelopmentSpad2Cmd l == zsystemdevelopment1 (l,$InteractiveMode)

zsystemdevelopment1(l,im) ==
  $InteractiveMode : local := im
  fromopt := nil
  -- cycle through once to see if )from is mentioned
  for [opt,:optargs] in $options repeat
    opt1 := selectOptionLC(opt,'(from),nil)
    opt1 = 'from => fromopt := [['FROM,:optargs]]
  for [opt,:optargs] in $options repeat
    if null optargs then optargs := l
    newopt := APPEND(optargs,fromopt)
    opt1 := selectOptionLC(opt,'(from),nil)
    opt1 = 'from => nil
    opt = "c"   => _/D_,1 (newopt ,_/COMP(),NIL,NIL)
    opt = "d"   => _/D_,1 (newopt ,'DEFINE,NIL,NIL)
    opt = "dt"  => _/D_,1 (newopt ,'DEFINE,NIL,true)
    opt = "ct"  => _/D_,1 (newopt ,_/COMP(),NIL,true)
    opt = "ctl"  => _/D_,1 (newopt ,_/COMP(),NIL,'TRACELET)
    opt = "ec"  => _/D_,1 (newopt ,_/COMP(),true,NIL)
    opt = "ect" => _/D_,1 (newopt ,_/COMP(),true,true)
    opt = "e"   => _/D_,1 (newopt ,NIL,true,NIL)
    opt = "version" => version()
    opt = "pause" =>
      conStream := DEFIOSTREAM ('((DEVICE . CONSOLE) (QUAL . V)),120,0)
      NEXT conStream
      SHUT conStream
    opt = "update" or opt = "patch" =>
      $InteractiveMode := nil
      upf := [KAR optargs or _/VERSION, KADR optargs or _/WSNAME,
              KADDR optargs or '_*]
      fun := (opt = "patch" => '_/UPDATE_-LIB_-1; '_/UPDATE_-1)
      CATCH('FILENAM, FUNCALL(fun, upf))
      sayMessage '"   Update/patch is completed."
    null optargs =>
      sayBrightly ['"   An argument is required for",:bright opt]
    sayMessage ['"   Unknown option:",:bright opt,"    ",'%l,
      '"   Available options are", _
      :bright '"c ct e ec ect cls pause update patch compare record"]

--% Synonym File Reader

processSynonyms() ==
  p := STRPOS('")",LINE,0,NIL)
  fill := '""
  if p
    then
      line := SUBSTRING(LINE,p,NIL)
      if p > 0 then fill := SUBSTRING(LINE,0,p)
    else
      p := 0
      line := LINE
  to := STRPOS ('" ", line, 1, nil)
  if to then to := to - 1
  synstr := SUBSTRING (line, 1, to)
  syn := STRING2ID_-N (synstr, 1)
  null (fun := LASSOC (syn, $CommandSynonymAlist)) => NIL
  fun := eval fun              -- fun may have been a suspension
  to := STRPOS('")",fun,1,NIL)
  if to and to ^= SIZE(fun)-1 then
    opt := STRCONC('" ",SUBSTRING(fun,to,NIL))
    fun := SUBSTRING(fun,0,to-1)
  else opt := '" "
  if (SIZE synstr) > (SIZE fun) then
    for i in (SIZE fun)..(SIZE synstr) repeat
      fun := CONCAT (fun, '" ")
--  $currentLine := STRCONC(fill,RPLACSTR(line, 1, SIZE synstr, fun),opt)
  cl := STRCONC(fill,RPLACSTR(line, 1, SIZE synstr, fun),opt)
  SETQ(LINE,cl)
  SETQ(CHR,LINE.(p+1))
  processSynonyms ()

-- functions for interfacing to system commands from algebra code
-- common lisp dependent

tabsToBlanks s ==
   k := charPosition($charTab,s,0)
   n := #s
   k < n =>
      k = 0 => tabsToBlanks SUBSTRING(s,1,nil)
      STRCONC(SUBSTRING(s,0,k),$charBlank, tabsToBlanks SUBSTRING(s,k + 1,nil))
   s

doSystemCommand string ==
   string := CONCAT('")", EXPAND_-TABS string)
   LINE: fluid := string
   processSynonyms()
   string := LINE
   string:=SUBSTRING(string,1,nil)
   string = '"" => nil
   tok:=getFirstWord(string)
   tok =>
        unab := unAbbreviateKeyword tok
        member(unab, $noParseCommands) =>
          handleNoParseCommands(unab, string)
        optionList := splitIntoOptionBlocks string
        member(unab, $tokenCommands) =>
          handleTokensizeSystemCommands(unab, optionList)
        handleParsedSystemCommands(unab, optionList)
        nil
   nil

handleNoParseCommands(unab, string) ==
  string := stripSpaces string
  spaceIndex := SEARCH('" ", string)
  unab = "lisp" =>
    if (null spaceIndex) then
      sayKeyedMsg("S2IV0005", NIL)
      nil
    else nplisp(stripLisp string)
  unab = "boot" =>
    if (null spaceIndex) then
      sayKeyedMsg("S2IV0005", NIL)
      nil
    else npboot(SUBSEQ(string, spaceIndex+1))
  unab = "system" =>
    if (null spaceIndex) then
      sayKeyedMsg("S2IV0005", NIL)
      nil
    else npsystem(unab, string)
  unab = "synonym" =>
    npsynonym(unab, (null spaceIndex => '""; SUBSEQ(string, spaceIndex+1)))
  null spaceIndex =>
    FUNCALL unab
  member(unab, '( quit     _
                  fin      _
                  pquit    _
                  credits  _
                  copyright )) => 
    sayKeyedMsg("S2IV0005", NIL)
    nil
  funName := INTERN CONCAT('"np",STRING unab)
  FUNCALL(funName, SUBSEQ(string, spaceIndex+1))


npboot str ==
  sex := string2BootTree str
  FORMAT(true, '"~&~S~%", sex)
  $ans := EVAL sex
  FORMAT(true, '"~&Value = ~S~%", $ans)

stripLisp str ==
  found := false
  strIndex := 0
  lispStr := '"lisp"
  for c0 in 0..#str-1 for c1 in 0..#lispStr-1 repeat
    (char str.c0) ^= (char lispStr.c1) =>
      return nil
    strIndex := c0+1
  SUBSEQ(str, strIndex)


nplisp str ==
  $ans := EVAL READ_-FROM_-STRING str
  FORMAT(true, '"~&Value = ~S~%", $ans)

npsystem(unab, str) ==
  spaceIndex := SEARCH('" ", str)
  null spaceIndex =>
    sayKeyedMsg('"S2IZ0080", [str])
  sysPart := SUBSEQ(str, 0, spaceIndex)
  -- The following is a hack required by the fact that unAbbreviateKeyword
  -- returns the word "system" for unknown words
  null SEARCH(sysPart, STRING unab) =>
    sayKeyedMsg('"S2IZ0080", [sysPart])
  command := SUBSEQ(str, spaceIndex+1)
  OBEY command

npsynonym(unab, str) ==
  npProcessSynonym(str)

tokenSystemCommand(unabr, tokList) ==
  systemCommand tokList

tokTran tok ==
  STRINGP tok =>
    #tok = 0 => nil
    isIntegerString tok => READ_-FROM_-STRING tok
    STRING tok.0 = '"_"" =>
      SUBSEQ(tok, 1, #tok-1)
    INTERN tok
  tok

isIntegerString tok ==
  for i in 0..#tok-1 repeat
    val := DIGIT_-CHAR_-P tok.i
    not val => return nil
  val

splitIntoOptionBlocks str ==
  inString := false
  optionBlocks := nil
  blockStart := 0
  parenCount := 0
  for i in 0..#str-1 repeat
    STRING str.i = '"_"" =>
      inString := not inString
    if STRING str.i = '"(" and not inString
    then parenCount := parenCount + 1
    if STRING str.i = '")" and not inString
    then parenCount := parenCount - 1
    STRING str.i = '")" and not inString and parenCount = -1 =>
      block := stripSpaces SUBSEQ(str, blockStart, i)
      blockList := [block, :blockList]
      blockStart := i+1
      parenCount := 0
  blockList := [stripSpaces SUBSEQ(str, blockStart), :blockList]
  nreverse blockList

dumbTokenize str ==
  -- split into tokens delimted by spaces, taking quoted strings into account
  inString := false
  tokenList := nil
  tokenStart := 0
  previousSpace := false
  for i in 0..#str-1 repeat
    STRING str.i = '"_"" =>
      inString := not inString
      previousSpace := false
    STRING str.i = '" " and not inString =>
      previousSpace => nil
      token := stripSpaces SUBSEQ(str, tokenStart, i)
      tokenList := [token, :tokenList]
      tokenStart := i+1
      previousSpace := true
    previousSpace := false
  tokenList := [stripSpaces SUBSEQ(str, tokenStart), :tokenList]
  nreverse tokenList

handleParsedSystemCommands(unabr, optionList) ==
  restOptionList := [dumbTokenize opt for opt in CDR optionList]
  parcmd := [parseSystemCmd CAR optionList,
             :[[tokTran tok for tok in opt] for opt in restOptionList]]
  systemCommand parcmd

parseSystemCmd opt ==
  spaceIndex := SEARCH('" ", opt)
  spaceIndex =>
    commandString := stripSpaces SUBSEQ(opt, 0, spaceIndex)
    argString := stripSpaces SUBSEQ(opt, spaceIndex)
    command := tokTran commandString
    pform := parseFromString argString
    [command, pform]
  [tokTran tok for tok in dumbTokenize opt]

parseFromString(s) ==
   s := next(function ncloopParse,
        next(function lineoftoks,incString s))
   StreamNull s => nil
   pf2Sex macroExpanded first rest first s

handleTokensizeSystemCommands(unabr, optionList) ==
  optionList := [dumbTokenize opt for opt in optionList]
  parcmd := [[tokTran tok for tok in opt] for opt in optionList]
  parcmd => tokenSystemCommand(unabr, parcmd)

getFirstWord string ==
  spaceIndex := SEARCH('" ", string)
  null spaceIndex => string
  stripSpaces SUBSEQ(string, 0, spaceIndex)

ltrace l == trace l

stripSpaces str ==
  STRING_-TRIM([char '" "], str)

npProcessSynonym(str) ==
  if str = '"" then printSynonyms(NIL)
  else
    pair := processSynonymLine str
    if $CommandSynonymAlist then
      PUTALIST($CommandSynonymAlist,CAR pair, CDR pair)
    else $CommandSynonymAlist := [pair]
  terminateSystemCommand()