Editing Handy option flag toggler | Vim Tips Wiki

{{duplicate|920}}
{{review}}
{{TipImported
|id=472
|previous=471
|next=473
|created=May 12, 2003
|complexity=basic
|author=robin
|version=6.0
|rating=14/5
|category1=Options
|category2=
}}
Here's a little function I put together to make some of my mappings easier to read, understand and change.

<pre>
function ToggleFlag(option,flag)
  exec ('let lopt = &amp;' . a:option)
  if lopt =~ (".*" . a:flag . ".*")
    exec ('set ' . a:option . '-=' . a:flag)
  else
    exec ('set ' . a:option . '+=' . a:flag)
  endif
endfunction
</pre>

Examples of use:
<pre>
map &lt;silent&gt; &lt;F8&gt; :call ToggleFlag("guioptions","m")&lt;CR&gt;
map &lt;silent&gt; &lt;F9&gt; :call ToggleFlag("guioptions","T")&lt;CR&gt;
</pre>

==Comments==
The following might be more flexible (I think it should work for any flag-style option).

<pre>
" my function to cycle a numeric option
function CycleNum(option,min,inc,max)
  exec ('let tz_value = (((&amp;'.a:option.'-'.a:min.')+'.a:inc.')%(('.a:max.'-'.a:min.')+'.a:inc.'))+'.a:min)
  if (tz_value &lt; a:min) " in case inc&lt;0
    let tz_value = tz_value+a:max
  endif
  exec ('setlocal '.a:option.'='.tz_value)
endfunction

" my function to toggle an option flag
function ToggleFlag(option,flag)
  exec ('let tf_o = &amp;'.a:option)
  exec ('setlocal '.a:option.'-='.a:flag)
  exec ('let tf_t = &amp;'.a:option)
  if (tf_o == tf_t)
    exec ('setlocal '.a:option.'+='.a:flag)
  endif
endfunction

" Toggle folding column
noremap &lt;silent&gt; &lt;F7&gt; :call CycleNum("foldcolumn",0,2,6)&lt;BAR&gt;set foldcolumn?&lt;CR&gt;
imap &lt;F7&gt; &lt;C-O&gt;&lt;F7&gt;

" Toggle window appearance
noremap &lt;silent&gt; &lt;F8&gt; :call ToggleFlag("guioptions","m")&lt;BAR&gt;set guioptions?&lt;CR&gt;
imap &lt;F8&gt; &lt;C-O&gt;&lt;F8&gt;
noremap &lt;silent&gt; &lt;F9&gt; :call ToggleFlag("guioptions","T")&lt;BAR&gt;set guioptions?&lt;CR&gt;
imap &lt;F9&gt; &lt;C-O&gt;&lt;F9&gt;

" Cycle tabstop
noremap &lt;silent&gt; &lt;M-t&gt;s :call CycleNum("tabstop",4,4,8)&lt;BAR&gt;set tabstop?&lt;CR&gt;
" Cycle shiftwidth
noremap &lt;silent&gt; &lt;M-t&gt;w :call CycleNum("shiftwidth",4,4,8)&lt;BAR&gt;set shiftwidth?&lt;CR&gt;
</pre>

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