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"
" 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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