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vim-patch:10040bc: runtime(sh): allow "#" in special derefs

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Code like ${!#} flags the "#" as shDerefWordError [1]; the "!prefix"
syntax region delegates to one of the shDerefSpecial handlers via
@shDerefList, but it misses the "#" case as valid for ${##} and ${!#}.

[1]: https://vi.stackexchange.com/q/48617/10604

Correct that. Indirection is only valid in Bash in Ksh, so rearrange the
"!" handling to be conditional.

closes: vim/vim#20016

Helped-by: Christian Brabandt <cb@256bit.org>

https://github.com/vim/vim/commit/10040bc9cde340c52b5093cacb1d60fd2e621883

Co-authored-by: D. Ben Knoble <ben.knoble+github@gmail.com>
This commit is contained in:
zeertzjq
2026-04-22 08:57:02 +08:00
parent f0facb8fa4
commit 9593ca249e
1 changed files with 4 additions and 1 deletions
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runtime/syntax/sh.vim
+4 -1
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@@ -24,6 +24,7 @@
" 2026 Feb 15 improve comment handling #19414
" 2026 Mar 23 improve matching of function definitions #19638
" 2026 Apr 02 improve matching of function definitions #19849
" 2026 Apr 19 improve detection of special variables #20016
" }}}
" Version: 208
" Former URL: http://www.drchip.org/astronaut/vim/index.html#SYNTAX_SH
@@ -751,13 +752,15 @@ endif
if exists("b:is_bash")
syn region shDeref matchgroup=PreProc start="\${!" end="\*\=}" contains=@shDerefList,shDerefOffset
syn match shDerefVar contained "{\@<=!\h\w*" nextgroup=@shDerefVarList
syn match shDerefSpecial contained "\({!\)\@<=[[:alnum:]*#@_]\+" nextgroup=@shDerefVarList,shDerefOp
endif
if (exists("b:is_kornshell") && !exists("b:is_ksh88"))
syn match shDerefVar contained "{\@<=!\h\w*[[:alnum:]_.]*" nextgroup=@shDerefVarList
syn match shDerefSpecial contained "\({!\)\@<=[[:alnum:]*#@_]\+" nextgroup=@shDerefVarList,shDerefOp
endif
syn match shDerefSpecial contained "{\@<=[-*@?0]" nextgroup=shDerefOp,shDerefOffset,shDerefOpError
syn match shDerefSpecial contained "\({[#!]\)\@<=[[:alnum:]*@_]\+" nextgroup=@shDerefVarList,shDerefOp
syn match shDerefSpecial contained "\({[#]\)\@<=[[:alnum:]*@_]\+" nextgroup=@shDerefVarList,shDerefOp
syn match shDerefVar contained "{\@<=\h\w*" nextgroup=@shDerefVarList
syn match shDerefVar contained '\d' nextgroup=@shDerefVarList
if exists("b:is_kornshell") || exists("b:is_posix")