From 85b05425ed3be65439fefa5f0074d3d7f18217f9 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Sat, 4 Nov 2017 17:33:06 +1300
Subject: Don't suggest mappings in Vim plugin comments

Pretty useless, really.
---
 vim/autoload/flag_toggle.vim | 54 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 vim/autoload/flag_toggle.vim

(limited to 'vim/autoload')

diff --git a/vim/autoload/flag_toggle.vim b/vim/autoload/flag_toggle.vim
new file mode 100644
index 00000000..10739149
--- /dev/null
+++ b/vim/autoload/flag_toggle.vim
@@ -0,0 +1,54 @@
+"
+" option_flags.vim: Provide functions to toggle flags in single-char grouped
+" options like 'formatoptions', 'shortmess', 'complete' etc.
+"
+" This will fail hilariously if you try to set e.g. 'switchbuf' with it!
+"
+" Author: Tom Ryder <tom@sanctum.geek.nz>
+" License: Same as Vim itself
+"
+if has('eval')
+
+  " Public wrapper function to toggle a flag with 'set'
+  function! option_flags#toggle(option, flag)
+    call s:toggle(a:option, a:flag, 0)
+  endfunction
+
+  " Public wrapper function to toggle a flag with 'setlocal'
+  function! option_flags#toggle_local(option, flag)
+    call s:toggle(a:option, a:flag, 1)
+  endfunction
+
+  " Internal function to do the toggling
+  function! s:toggle(option, flag, local)
+
+    " Check for weird options, we don't want to eval() anything funny
+    if a:option =~# '[^a-z]'
+      echoerr 'Illegal option name'
+      return
+    endif
+
+    " Weird flags, too; should be a single inoffensive char
+    if a:flag !~# '^[a-z0-9.]$'
+      echoerr 'Illegal flag'
+      return
+    endif
+
+    " Choose which set command to use
+    if a:local
+      let l:set = 'setlocal '
+    else
+      let l:set = 'set '
+    endif
+
+    " Use eval() to assign -= or += to l:op for the option toggle
+    " (I couldn't get {curly braces} indirection to work)
+    let l:op = ''
+    execute 'let l:op = &'.a:option.' =~# a:flag ? "-=" : "+="'
+
+    " Use eval() to perform the option toggle and then print the value
+    execute l:set . ' ' . a:option . l:op . a:flag . ' ' . a:option . '?'
+
+  endfunction
+
+endif
-- 
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