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, 34 insertions, 1 deletions

diff --git a/test/command/6873.md b/test/command/6873.md
index d747a47ff..f2d47b5ad 100644
--- a/test/command/6873.md
+++ b/test/command/6873.md
@@ -3,5 +3,38 @@
 \cite[„Etwas […{]} auslassen“]{key}
 ^D
 [WARNING] Citeproc: citation key not found
-[Para [Cite [Citation {citationId = "key", citationPrefix = [], citationSuffix = [Str "\8222Etwas",Space,Str "[\8230",Span ("",[],[]) [Str "]"],Space,Str "auslassen\8220"], citationMode = NormalCitation, citationNoteNum = 0, citationHash = 0}] [Str "(",Strong [Str "key?"],Str "\8222Etwas",Space,Str "[\8230",Span ("",[],[]) [Str "]"],Space,Str "auslassen\8220)"]]]
+[ Para
+  [ Cite
+    [ Citation
+      { citationId = "key"
+      , citationPrefix = []
+      , citationSuffix =
+        [ Str "\8222Etwas"
+        , Space
+        , Str "[\8230"
+        , Span
+          ( "", [], [] )
+          [ Str "]" ]
+        , Space
+        , Str "auslassen\8220"
+        ]
+      , citationMode = NormalCitation
+      , citationNoteNum = 0
+      , citationHash = 0
+      }
+    ]
+    [ Str "("
+    , Strong
+      [ Str "key?" ]
+    , Str "\8222Etwas"
+    , Space
+    , Str "[\8230"
+    , Span
+      ( "", [], [] )
+      [ Str "]" ]
+    , Space
+    , Str "auslassen\8220)"
+    ]
+  ]
+]
 ```