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I have a function that I would like to run once and do nothing in subsequent calls to it. It handles lazy-loading of plugins. 

function! LoadExpensivePlugins()
  call StuffToRunOnceOnly
  " what do i do here?
endfun
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  • Trying to define a new function inside of it results in E127: Cannot redefine function LoadExpensivePlugins: It is in use – Steven Lu Feb 16 '17 at 19:06
  • 1
    I would simply delete it: :delfunction (this won't work from within the function however (as you noted)) – Christian Brabandt Feb 16 '17 at 19:25
  • couldn't find :delfunction. Thank you.... – Steven Lu Feb 16 '17 at 21:40
  • Do you have a specific reason for trying to postpone the loading of plugins? I would say that the features of a plugin that you do not need all the time should not be loaded until they are needed. Vim provides ways of doing just that with autoload and ftplugin etc. – Octaviour Feb 17 '17 at 16:19
  • YouCompleteMe is the main one that is big and expensive. I use Vim-Plug to manage the plugins. My understanding of the situation is that vim-plug and vim's own auto/on-demand loading do not work properly on this plugin so I'm using this technique, but since it's getting more unwieldy, I'm breaking it out to its own function. – Steven Lu Feb 17 '17 at 19:43
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The simplest solution is simply to set a variable:

let s:LoadExpensivePluginsHasBeenRun = 0
function! LoadExpensivePlugins()
   if !(s:LoadExpensivePluginsHasBeenRun)
      call StuffToRunOnceOnly
      let s:LoadExpensivePluginsHasBeenRun = 1
   endif
endfun
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  • Also would accept :delfunction as an answer, it seems more directly answering my original question. – Steven Lu Feb 16 '17 at 21:40

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