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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 Commented Feb 16, 2017 at 19:06
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    I would simply delete it: :delfunction (this won't work from within the function however (as you noted)) Commented Feb 16, 2017 at 19:25
  • 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. Commented Feb 17, 2017 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. Commented Feb 17, 2017 at 19:43
  • As for why bother attempting on-demand/lazy loading of plugins, even though it seems difficult to push vim startup time below 500ms, it's much better than the ~1200ms startup time I had before when everything always gets loaded. The other main thing is that a YCM daemon chews RAM like delicious candy. If I'm only opening a file to view it to make it visible in my terminal, I do not need it. So I want it set up so it gets loaded upon entering insert mode or upon using a related command such as Go to definition. Commented Feb 17, 2017 at 19:45

1 Answer 1

Reset to default
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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. Commented Feb 16, 2017 at 21:40

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