From a8dd4b486c2c8afd4e2b61ee7a9946a452368963 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Wed, 15 Nov 2017 07:48:40 +1300
Subject: Coax sh.vim into accepting #/% param expansion

These forms of parameter expansion are specified in POSIX sh.
---
 vim/after/syntax/sh.vim | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'vim')

diff --git a/vim/after/syntax/sh.vim b/vim/after/syntax/sh.vim
index 8025c567..4d56d3a8 100644
--- a/vim/after/syntax/sh.vim
+++ b/vim/after/syntax/sh.vim
@@ -119,6 +119,21 @@ if exists('b:is_posix')
   syntax cluster shCaseList add=shRepeat
   syntax cluster shFunctionList add=shRepeat
 
+  " ${foo%bar}, ${foo%%bar}, ${foo#bar}, and ${foo##bar} are all valid forms
+  " of parameter expansion in POSIX, but sh.vim makes them conditional on
+  " Bash or Korn shell. We reinstate them (slightly adapted) here.
+  syn match shDerefOp contained
+        \ '##\|#\|%%\|%'
+        \ nextgroup=@shDerefPatternList
+  syn match shDerefPattern contained
+        \ '[^{}]\+'
+        \ contains=shDeref,shDerefSimple,shDerefPattern,shDerefString,shCommandSub,shDerefEscape
+        \ nextgroup=shDerefPattern
+  syn region shDerefPattern contained
+        \ start='{' end='}'
+        \ contains=shDeref,shDerefSimple,shDerefString,shCommandSub
+        \ nextgroup=shDerefPattern
+
 endif
 
 " Some corrections for highlighting specific to the Bash mode
-- 
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