From 2ba00c6c583cef8f3dcf06a8aa9bec8754b81498 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Wed, 8 Nov 2017 12:53:22 +1300
Subject: Override commands and variables for syntax/sh.vim

The defaults for these groups don't make much sense to me, so I
completely reset them.

This isn't quite complete yet; for some reason as soon as e.g. an IFS=
setting is contained in e.g. an "if" or "while" block, they don't
highlight correctly anymore. There's probably some other part of the
core syntax/sh.vim file I need to include here.
---
 vim/after/syntax/sh.vim | 76 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)

diff --git a/vim/after/syntax/sh.vim b/vim/after/syntax/sh.vim
index 48a3452d..9692ea9f 100644
--- a/vim/after/syntax/sh.vim
+++ b/vim/after/syntax/sh.vim
@@ -18,6 +18,82 @@ syntax clear shDerefWordError
 " probably not worth keeping the error.
 syntax clear shParenError
 
+" Highlighting corrections specific to POSIX mode
+if exists('b:is_posix')
+
+  " Highlight some commands that are both defined by POSIX and builtin
+  " commands in dash, as a rough but useable proxy for 'shell builtins'. This
+  " list was wrested from `man 1 dash`.
+  syntax clear shStatement
+  syntax keyword shStatement
+        \ alias
+        \ bg
+        \ cd
+        \ command
+        \ echo
+        \ eval
+        \ exec
+        \ exit
+        \ export
+        \ fc
+        \ fg
+        \ getopts
+        \ hash
+        \ printf
+        \ pwd
+        \ read
+        \ readonly
+        \ set
+        \ shift
+        \ test
+        \ times
+        \ trap
+        \ true
+        \ type
+        \ ulimit
+        \ umask
+        \ unalias
+        \ unset
+        \ wait
+
+  " Core syntax/sh.vim puts IFS and other variables that affect shell function
+  " in another color, but a subset of them actually apply to POSIX shell too
+  " (and plain Bourne). These are selected by searching the POSIX manpages. I
+  " added NLSPATH too, which wasn't in the original.
+  syntax clear shShellVariables
+  syntax keyword shShellVariables
+        \ CDPATH
+        \ ENV
+        \ FCEDIT
+        \ HISTFILE
+        \ HISTSIZE
+        \ HISTTIMEFORMAT
+        \ HOME
+        \ IFS
+        \ LANG
+        \ LC_ALL
+        \ LC_COLLATE
+        \ LC_CTYPE
+        \ LC_MESSAGES
+        \ LC_NUMERIC
+        \ LINENO
+        \ MAIL
+        \ MAILCHECK
+        \ MAILPATH
+        \ NLSPATH
+        \ OLDPWD
+        \ OPTARG
+        \ OPTERR
+        \ OPTIND
+        \ PATH
+        \ PS1
+        \ PS2
+        \ PS3
+        \ PS4
+        \ PWD
+
+endif
+
 " Some corrections for highlighting specific to the Bash mode
 if exists('b:is_bash')
 
-- 
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