unposted: internal: Vim ztst support: Add an ftplugin in addition to the syntax highlighter.

ChangeLog

@@ -1,3 +1,9 @@
+2019-12-27  Daniel Shahaf  <danielsh@apache.org>
+
+	* unposted: Test/B01cd.ztst, Util/ztst-ftplugin.vim,
+	Util/ztst-syntax.vim: internal: Vim ztst support: Add an ftplugin
+	in addition to the syntax highlighter.
+
 2019-12-26  dana  <dana@dana.is>
 
 	* 45130: Completion/Base/Utility/_multi_parts: Always pass -f

Test/B01cd.ztst

@@ -106,7 +106,7 @@
 # ZTST_skip: Set this in any test case if that single test case is to be
 #   skipped.  Testing resumes at the next test case in the same file.
 #
-# Syntax highlighting for Vim is available, see Util/ztst.vim.
+# Syntax highlighting for Vim is available, see Util/ztst-*.vim.
  cd cdtst.tmp/sub/fake &&
  pwd &&
  print $PWD

Util/ztst-ftplugin.vim

@@ -0,0 +1,29 @@
+" ztst filetype plugin
+
+" Only do this when not done yet for this buffer
+if exists("b:did_ftplugin")
+  finish
+endif
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+" Inherit zsh.vim
+runtime! ftplugin/zsh.vim
+
+let b:undo_ftplugin .= "| setl fo< comments< commentstring<"
+
+" Set 'formatoptions' to break comment lines but not other lines,
+" and insert the comment leader when hitting <CR> or using "o".
+setlocal fo-=t fo+=croql
+
+" Set 'comments' to format expected output/errput lines
+setlocal comments+=:*>,:>,:*?,:?,:F:
+
+" Format comments to be up to 78 characters long
+if &textwidth == 0
+  setlocal textwidth=78
+endif
+
+let &cpo = s:cpo_save
+unlet s:cpo_save