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"
" toggle_option_flag.vim: Provide commands 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 exists('g:loaded_toggle_option_flag')
\ || !has('user_commands')
\ || &compatible
finish
endif
let g:loaded_toggle_option_flag = 1
" Internal function to do the toggling
function! s:Toggle(option, flag, local)
" Check for weird options, we don't want to :execute anything funny
if a:option =~# '\m\L'
echoerr 'Illegal option name'
return
endif
" Weird flags, too; should be a single inoffensive char
if a:flag !~# '\m^[\a.]$'
echoerr 'Illegal flag'
return
endif
" Choose which set command to use
let l:set = a:local
\ ? 'setlocal'
\ : 'set'
" :execute 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 ? "-=" : "+="'
" Build the command strings to set and then show the value
let l:cmd_set = l:set . ' ' . a:option . l:op . a:flag
let l:cmd_show = l:set . ' ' . a:option . '?'
" Run the set and show command strings
execute l:cmd_set
execute l:cmd_show
endfunction
" User commands wrapping around calls to the above function
command -nargs=+ -complete=option
\ ToggleOptionFlag
\ call <SID>Toggle(<f-args>, 0)
command -nargs=+ -complete=option
\ ToggleOptionFlagLocal
\ call <SID>Toggle(<f-args>, 1)
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