runtime(sh): Update syntax, highlight escaped chars in test expressions
Highlight escape characters in unquoted test expression operands.
E.g., [[ foo == \[bar\] ]]
fixes #17221
Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/syntax/sh.vim b/runtime/syntax/sh.vim
index 9e5320f..f0a6685 100644
--- a/runtime/syntax/sh.vim
+++ b/runtime/syntax/sh.vim
@@ -10,6 +10,7 @@
" 2025 Mar 21 update shell capability detection (#16939)
" 2025 Apr 03 command substitution opening paren at EOL (#17026)
" 2025 Apr 10 improve shell detection (#17084)
+" 2025 Apr 29 match escaped chars in test operands (#17221)
" Version: 208
" Former URL: http://www.drchip.org/astronaut/vim/index.html#SYNTAX_SH
" For options and settings, please use: :help ft-sh-syntax
@@ -306,7 +307,7 @@
"=======
syn region shExpr matchgroup=shRange start="\[\s\@=" skip=+\\\\\|\\$\|\[+ end="\]" contains=@shTestList,shSpecial
syn region shTest transparent matchgroup=shStatement start="\<test\s" skip=+\\\\\|\\$+ matchgroup=NONE end="[;&|]"me=e-1 end="$" contains=@shExprList1
-syn region shNoQuote start='\S' skip='\%(\\\\\)*\\.' end='\ze\s' end="\ze['"]" contained contains=shBracketExpr,shDerefSimple,shDeref
+syn region shNoQuote start='\S' skip='\%(\\\\\)*\\.' end='\ze\s' end="\ze['"]" contained contains=shBracketExpr,shDerefSimple,shDeref,shEscape
syn match shAstQuote contained '\*\ze"' nextgroup=shString
syn match shTestOpr contained '[^-+/%]\zs=' skipwhite nextgroup=shTestDoubleQuote,shTestSingleQuote,shTestPattern
syn match shTestOpr contained "<=\|>=\|!=\|==\|=\~\|-.\>\|-\(nt\|ot\|ef\|eq\|ne\|lt\|le\|gt\|ge\)\>\|[!<>]"