runtime(sh): Update syntax, fix single-quoted strings in parameter expansions
Ignore single-quoted backslash escape sequences in parameter expansions.
\' is not an escaped single quote in ${foo:-'word\'}.
closes: #17261
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 f0a6685..4add792 100644
--- a/runtime/syntax/sh.vim
+++ b/runtime/syntax/sh.vim
@@ -11,6 +11,7 @@
" 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)
+" 2025 May 06 improve single-quote string matching in parameter expansions
" Version: 208
" Former URL: http://www.drchip.org/astronaut/vim/index.html#SYNTAX_SH
" For options and settings, please use: :help ft-sh-syntax
@@ -649,7 +650,7 @@
syn match shDerefOp contained "[,^]\{1,2}" nextgroup=@shDerefPatternList
syn match shDerefOp contained "@[uULQEPAKa]"
endif
-syn region shDerefString contained matchgroup=shDerefDelim start=+\%(\\\)\@<!'+ end=+'+ contains=shStringSpecial
+syn region shDerefString contained matchgroup=shDerefDelim start=+\%(\\\)\@<!'+ end=+'+
syn region shDerefString contained matchgroup=shDerefDelim start=+\%(\\\)\@<!"+ skip=+\\"+ end=+"+ contains=@shDblQuoteList,shStringSpecial
syn match shDerefString contained "\\["']" nextgroup=shDerefPattern