diff options
Diffstat (limited to 'texinfo.tex')
| -rw-r--r-- | texinfo.tex | 105 |
1 files changed, 79 insertions, 26 deletions
diff --git a/texinfo.tex b/texinfo.tex index 84d6683..6e17548 100644 --- a/texinfo.tex +++ b/texinfo.tex @@ -2636,21 +2636,35 @@ width0pt\relax} \fi % These macros are used by the sorted index file itself. % Change them to control the appearance of the index. -% Same as \bigskipamount except no shrink. -% \balancecolumns gets confused if there is any shrink. -\newskip\initialskipamount \initialskipamount 12pt plus4pt - -\def\initial #1{% -{\let\tentt=\sectt \let\tt=\sectt \let\sf=\sectt -\ifdim\lastskip<\initialskipamount -\removelastskip \penalty-200 \vskip \initialskipamount\fi -\line{\secbf#1\hfill}\kern 2pt\penalty10000}} +\def\initial#1{{% + % Some minor font changes for the special characters. + \let\tentt=\sectt \let\tt=\sectt \let\sf=\sectt + % + % Remove any glue we may have, we'll be inserting our own. + \removelastskip + % + % We like breaks before the index initials, so insert a bonus. + \penalty -300 + % + % Typeset the initial. Making this add up to a whole number of + % baselineskips increases the chance of the dots lining up from column + % to column. It still won't often be perfect, because of the stretch + % we need before each entry, but it's better. + % + % No shrink because it confuses \balancecolumns. + \vskip 1.67\baselineskip plus .5\baselineskip + \leftline{\secbf #1}% + \vskip .33\baselineskip plus .1\baselineskip + % + % Do our best not to break after the initial. + \nobreak +}} % This typesets a paragraph consisting of #1, dot leaders, and then #2 % flush to the right margin. It is used for index and table of contents % entries. The paragraph is indented by \leftskip. % -\def\entry #1#2{\begingroup +\def\entry#1#2{\begingroup % % Start a new paragraph if necessary, so our assignments below can't % affect previous text. @@ -2673,12 +2687,15 @@ width0pt\relax} \fi % % \hangafter is reset to 1 (which is the value we want) at the start % of each paragraph, so we need not do anything with that. - \hangindent=2em + \hangindent = 2em % % When the entry text needs to be broken, just fill out the first line % with blank space. \rightskip = 0pt plus1fil % + % A bit of stretch before each entry for the benefit of balancing columns. + \vskip 0pt plus1pt + % % Start a ``paragraph'' for the index entry so the line breaking % parameters we've set above will have an effect. \noindent @@ -2777,14 +2794,21 @@ width0pt\relax} \fi % % Double the \vsize as well. (We don't need a separate register here, % since nobody clobbers \vsize.) + \advance\vsize by -\ht\partialpage \vsize = 2\vsize } + +% The double-column output routine for all double-column pages except +% the last. +% \def\doublecolumnout{% \splittopskip=\topskip \splitmaxdepth=\maxdepth % Get the available space for the double columns -- the normal % (undoubled) page height minus any material left over from the % previous page. - \dimen@=\pageheight \advance\dimen@ by-\ht\partialpage + \dimen@ = \vsize + \divide\dimen@ by 2 + % % box0 will be the left-hand column, box2 the right. \setbox0=\vsplit255 to\dimen@ \setbox2=\vsplit255 to\dimen@ \onepageout\pagesofar @@ -2793,35 +2817,60 @@ width0pt\relax} \fi } \def\pagesofar{% % Re-output the contents of the output page -- any previous material, - % followed by the two boxes we just split. + % followed by the two boxes we just split, in box0 and box2. + \advance\vsize by \ht\partialpage \unvbox\partialpage + % \hsize = \doublecolumnhsize - \wd0=\hsize \wd2=\hsize \hbox to\pagewidth{\box0\hfil\box2}% + \wd0=\hsize \wd2=\hsize + \hbox to\pagewidth{\box0\hfil\box2}% } \def\enddoublecolumns{% - \output = {\balancecolumns}\eject % split what we have + \output = {% + % Split the last of the double-column material. Leave on the + % current page, no automatic page break. + \balancecolumns + % + % If we end up splitting too much material for the current page, + % though, there will be another page break right after this \output + % invocation ends. Having called \balancecolumns once, we do not + % want to call it again. Therefore, reset \output to its normal + % definition right away. (We hope \balancecolumns will never be + % called on to balance too much material, but if it is, this makes + % the output somewhat more palatable.) + \global\output = {\onepageout{\pagecontents\PAGE}}% + % + % \pagegoal was set to the doubled \vsize above, since we restarted + % the current page. We're now back to normal single-column + % typesetting, so reset \pagegoal to the normal \vsize. + \pagegoal = \vsize + }% + \eject \endgroup % started in \begindoublecolumns - % - % Back to normal single-column typesetting, but take account of the - % fact that we just accumulated some stuff on the output page. - \pagegoal = \vsize } \def\balancecolumns{% % Called at the end of the double column material. - \setbox0 = \vbox{\unvbox255}% + \setbox0 = \vbox{\unvbox255}% like \box255 but more efficient, see p.120. \dimen@ = \ht0 \advance\dimen@ by \topskip \advance\dimen@ by-\baselineskip - \divide\dimen@ by 2 + \divide\dimen@ by 2 % target to split to + %debug\message{final 2-column material height=\the\ht0, target=\the\dimen@.}% \splittopskip = \topskip % Loop until we get a decent breakpoint. - {\vbadness=10000 \loop - \global\setbox3=\copy0 - \global\setbox1=\vsplit3 to\dimen@ - \ifdim\ht3>\dimen@ \global\advance\dimen@ by1pt - \repeat}% + {% + \vbadness = 10000 + \loop + \global\setbox3 = \copy0 + \global\setbox1 = \vsplit3 to \dimen@ + \ifdim\ht3>\dimen@ + \global\advance\dimen@ by 1pt + \repeat + }% + %debug\message{split to \the\dimen@, column heights: \the\ht1, \the\ht3.}% \setbox0=\vbox to\dimen@{\unvbox1}% \setbox2=\vbox to\dimen@{\unvbox3}% + % \pagesofar } \catcode`\@ = \other @@ -4377,6 +4426,7 @@ width0pt\relax} \fi \def\deftpx #1 {\errmessage{@deftpx in invalid context}} + \message{macros,} % @macro. @@ -5024,6 +5074,9 @@ width0pt\relax} \fi % Prevent underfull vbox error messages. \vbadness = 10000 +% Don't be so finicky about underfull hboxes, either. +\hbadness = 2000 + % Following George Bush, just get rid of widows and orphans. \widowpenalty=10000 \clubpenalty=10000 |