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+"" A Vim syntax highlighting file for Test/*.ztst
+"
+" See ../Util/zyodl.vim for installation instructions
+" See B01cd.ztst for cases we cover
+
+" TODO: Some zsh syntax isn't highlighted, e.g., «{ cd $0 }» doesn't highlight either 'cd' or '$0'
+"   Apparently because the $VIMRUNTIME/syntax/zsh.vim zshBrackets group is defined as 'contains=TOP'?
+"   https://bugs.debian.org/947120
+" TODO: ZTST_unimplemented ZTST_skip aren't recognized everywhere
+"   I haven't found yet a legitimate use where they aren't highlighted, but
+"   they aren't highlighted in theoretical cases such as (( ++ZTST_skip )).
+"   (This example is theoretical because those variables are string-typed.)
+" TODO: for glob-like output/errput lines, conceal the '>' or '?' to align them with adjacent lines.
+
+"" Boilerplate:
+if exists("b:current_syntax")
+  finish
+endif
+let s:cpo_save = &cpo
+set cpo&vim
+
+"" Syntax groups:
+syn clear
+
+syn include @zsh                   syntax/zsh.vim
+
+syn match  ztstPayload             /^\s\+\zs.*/ contains=@zsh
+
+syn match  ztstExitCode            /^\d\+\|^-/                nextgroup=ztstFlags
+syn match  ztstFlags               /[.dDq]*:/       contained nextgroup=ztstTestName contains=ztstColon
+syn match  ztstColon               /:/              contained
+syn region ztstTestName            start=// end=/$/ contained 
+
+syn match  ztstInputMarker         /^</                       nextgroup=ztstInput
+syn region ztstInput               start=// end=/$/ contained
+syn match  ztstOutputMarker        /^[*]\?>/                  nextgroup=ztstOutput   contains=ztstPatternMarker
+syn region ztstOutput              start=// end=/$/ contained
+syn match  ztstErrputMarker        /^[*]\??/                  nextgroup=ztstErrput   contains=ztstPatternMarker
+syn region ztstErrput              start=// end=/$/ contained
+syn match  ztstPatternMarker       /[*]/            contained
+
+syn match  ztstFrequentExplanationMarker /^F:/                nextgroup=ztstFrequentExplanation
+syn region ztstFrequentExplanation start=// end=/$/ contained
+
+syn match  ztstDirective           /^%.*/
+
+syn match  ztstComment             /^#.*/
+
+syn keyword ztstSpecialVariable ZTST_unimplemented ZTST_skip ZTST_testdir containedin=@zsh 
+
+"" Highlight groups:
+hi def link ztstExitCode                  Number
+hi def link ztstFlags                     Normal
+hi def link ztstColon                     Ignore
+hi def link ztstTestName                  Title
+hi def link ztstInput                     Normal
+hi def link ztstInputMarker               Ignore
+hi def link ztstOutput                    String
+hi def link ztstOutputMarker              Ignore
+hi def link ztstErrput                    Identifier
+hi def link ztstErrputMarker              Ignore
+hi def link ztstDirective                 Statement
+hi def link ztstPatternMarker             Type
+hi def link ztstComment                   Comment
+hi def link ztstFrequentExplanation       PreProc
+hi def link ztstFrequentExplanationMarker Ignore
+hi def link ztstSpecialVariable           Underlined
+
+"" Boilerplate:
+let b:current_syntax = "ztst"
+let &cpo = s:cpo_save
+unlet s:cpo_save