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

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