Use pretty-simple to format native output.

Previously we used our own homespun formatting.  But this
produces over-long lines that aren't ideal for diffs in tests.
Easier to use something off-the-shelf and standard.

Closes #7580.

Performance is slower by about a factor of 10, but this isn't
really a problem because native isn't suitable as a serialization
format. (For serialization you should use json, because the reader
is so much faster than native.)

1 files changed, 89 insertions, 19 deletions

diff --git a/test/command/3587.md b/test/command/3587.md
index 3016afa5a..402ad7d9f 100644
--- a/test/command/3587.md
+++ b/test/command/3587.md
@@ -2,14 +2,36 @@
 % pandoc -f latex -t native
 \SI[round-precision=2]{1}{m} is equal to \SI{1000}{mm}
 ^D
-[Para [Str "1\160m",Space,Str "is",Space,Str "equal",Space,Str "to",Space,Str "1000\160mm"]]
+[ Para
+  [ Str "1\160m"
+  , Space
+  , Str "is"
+  , Space
+  , Str "equal"
+  , Space
+  , Str "to"
+  , Space
+  , Str "1000\160mm"
+  ]
+]
 ```
 
 ```
 % pandoc -f latex -t native
 \SI[round-precision=2]{1}[\$]{} is equal to \SI{0.938094}{\euro}
 ^D
-[Para [Str "$\160\&1",Space,Str "is",Space,Str "equal",Space,Str "to",Space,Str "0.938094\160\8364"]]
+[ Para
+  [ Str "$\160\&1"
+  , Space
+  , Str "is"
+  , Space
+  , Str "equal"
+  , Space
+  , Str "to"
+  , Space
+  , Str "0.938094\160\8364"
+  ]
+]
 ```
 
 
@@ -17,35 +39,35 @@
 % pandoc -f latex -t native
 \SI{30}{\milli\meter}
 ^D
-[Para [Str "30\160mm"]]
+[ Para [ Str "30\160mm" ] ]
 ```
 
 ```
 % pandoc -f latex -t native
 \SI{6}{\gram}
 ^D
-[Para [Str "6\160g"]]
+[ Para [ Str "6\160g" ] ]
 ```
 
 ```
 % pandoc -f latex -t native
 \SI{25}{\square\meter}
 ^D
-[Para [Str "25\160m",Superscript [Str "2"]]]
+[ Para [ Str "25\160m", Superscript [ Str "2" ] ] ]
 ```
 
 ```
 % pandoc -f latex -t native
 \SI{18.2}{\degreeCelsius}
 ^D
-[Para [Str "18.2\160\176C"]]
+[ Para [ Str "18.2\160\176C" ] ]
 ```
 
 ```
 % pandoc -f latex -t native
 \SI{18.2}{\celsius}
 ^D
-[Para [Str "18.2\160\176C"]]
+[ Para [ Str "18.2\160\176C" ] ]
 ```
 
 # SIrange tests
@@ -56,19 +78,19 @@
 % pandoc -f latex -t native
 \SIrange{10}{20}{\gram}
 ^D
-[Para [Str "10\160g\8211\&20\160g"]]
+[ Para [ Str "10\160g\8211\&20\160g" ] ]
 ```
 ```
 % pandoc -f latex -t native
 \SIrange{35}{9}{\milli\meter}
 ^D
-[Para [Str "35\160mm\8211\&9\160mm"]]
+[ Para [ Str "35\160mm\8211\&9\160mm" ] ]
 ```
 ```
 % pandoc -f latex -t native
 \SIrange{4}{97367265}{\celsius}
 ^D
-[Para [Str "4\160\176C\8211\&97367265\160\176C"]]
+[ Para [ Str "4\160\176C\8211\&97367265\160\176C" ] ]
 ```
 
 ## Decimal range with simple units
@@ -77,7 +99,7 @@
 % pandoc -f latex -t native
 \SIrange{4.5}{97367265.5}{\celsius}
 ^D
-[Para [Str "4.5\160\176C\8211\&97367265.5\160\176C"]]
+[ Para [ Str "4.5\160\176C\8211\&97367265.5\160\176C" ] ]
 ```
 
 ## Squared, cubed etc. units
@@ -86,21 +108,45 @@
 % pandoc -f latex -t native
 \SIrange{10}{20}{\square\meter}
 ^D
-[Para [Str "10\160m",Superscript [Str "2"],Str "\8211\&20\160m",Superscript [Str "2"]]]
+[ Para
+  [ Str "10\160m"
+  , Superscript
+    [ Str "2" ]
+  , Str "\8211\&20\160m"
+  , Superscript
+    [ Str "2" ]
+  ]
+]
 ```
 
 ```
 % pandoc -f latex -t native
 \SIrange{10}{20}{\cubic\meter}
 ^D
-[Para [Str "10\160m",Superscript [Str "3"],Str "\8211\&20\160m",Superscript [Str "3"]]]
+[ Para
+  [ Str "10\160m"
+  , Superscript
+    [ Str "3" ]
+  , Str "\8211\&20\160m"
+  , Superscript
+    [ Str "3" ]
+  ]
+]
 ```
 
 ```
 % pandoc -f latex -t native
 \SIrange{10}{20}{\raisetothe{4}\meter}
 ^D
-[Para [Str "10\160m",Superscript [Str "4"],Str "\8211\&20\160m",Superscript [Str "4"]]]
+[ Para
+  [ Str "10\160m"
+  , Superscript
+    [ Str "4" ]
+  , Str "\8211\&20\160m"
+  , Superscript
+    [ Str "4" ]
+  ]
+]
 ```
 
 
@@ -108,21 +154,45 @@
 % pandoc -f latex -t native
 \SIrange{10}{20}{\meter\squared}
 ^D
-[Para [Str "10\160m",Superscript [Str "2"],Str "\8211\&20\160m",Superscript [Str "2"]]]
+[ Para
+  [ Str "10\160m"
+  , Superscript
+    [ Str "2" ]
+  , Str "\8211\&20\160m"
+  , Superscript
+    [ Str "2" ]
+  ]
+]
 ```
 
 ```
 % pandoc -f latex -t native
 \SIrange{10}{20}{\meter\cubed}
 ^D
-[Para [Str "10\160m",Superscript [Str "3"],Str "\8211\&20\160m",Superscript [Str "3"]]]
+[ Para
+  [ Str "10\160m"
+  , Superscript
+    [ Str "3" ]
+  , Str "\8211\&20\160m"
+  , Superscript
+    [ Str "3" ]
+  ]
+]
 ```
 
 ```
 % pandoc -f latex -t native
 \SIrange{10}{20}{\meter\tothe{4}}
 ^D
-[Para [Str "10\160m",Superscript [Str "4"],Str "\8211\&20\160m",Superscript [Str "4"]]]
+[ Para
+  [ Str "10\160m"
+  , Superscript
+    [ Str "4" ]
+  , Str "\8211\&20\160m"
+  , Superscript
+    [ Str "4" ]
+  ]
+]
 ```
 
 
@@ -136,12 +206,12 @@
 % pandoc -f latex -t native
 \SIrange[round-precision=2]{10}{20}{\gram}
 ^D
-[Para [Str "10\160g\8211\&20\160g"]]
+[ Para [ Str "10\160g\8211\&20\160g" ] ]
 ```
 ```
 % pandoc -f latex -t native
 \SIrange[round-precision=2]{10.0}{20.25}{\gram}
 ^D
-[Para [Str "10.0\160g\8211\&20.25\160g"]]
+[ Para [ Str "10.0\160g\8211\&20.25\160g" ] ]
 ```