Add toggle yoe for conceallevel

[oe and ]oe cycle through the conceallevel 0-4.

Author: kiryph

doc/unimpaired.txt

@@ -78,6 +78,7 @@ On	Off	Toggle	Option
 *[ob*	*]ob*	*yob*	'background' (dark is off, light is on)
 *[oc*	*]oc*	*yoc*	'cursorline'
 *[od*	*]od*	*yod*	'diff' (actually |:diffthis| / |:diffoff|)
+*[oe*	*]oe*	*yoe*	'conceallevel' (|[oe| and |]oe| cycle concellevel)
 *[oh*	*]oh*	*yoh*	'hlsearch'
 *[oi*	*]oi*	*yoi*	'ignorecase'
 *[ol*	*]ol*	*yol*	'list'

plugin/unimpaired.vim

@@ -271,6 +271,9 @@ call s:option_map('<Bar>', 'cursorcolumn', 'setlocal')
 call s:map('n', '[od', ':diffthis<CR>')
 call s:map('n', ']od', ':diffoff<CR>')
 call s:map('n', 'yod', ':<C-R>=&diff ? "diffoff" : "diffthis"<CR><CR>')
+call s:map('n', '[oe', ':setlocal <C-R>="conceallevel=".(&conceallevel+1)%4<CR><CR>')
+call s:map('n', ']oe', ':setlocal <C-R>="conceallevel=".float2nr(&conceallevel-1-(4*floor((&conceallevel-1)/4.0)))<CR><CR>')
+call s:map('n', 'yoe', ':setlocal <C-R>=&conceallevel ? "conceallevel=0" : "conceallevel=2"<CR><CR>')
 call s:option_map('h', 'hlsearch', 'set')
 call s:option_map('i', 'ignorecase', 'set')
 call s:option_map('l', 'list', 'setlocal')