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Experiment with providing a custom mapping for our Git SHA completion
function. We use <C-x><C-s>.
The custom mapping should set our function as the custom `completefunc`,
call the user completion function by programmatically running
`<C-x><C-u>`, and then unset and restore the previous `completefunc`
value.
This allows us to not clobber a user-defined completion function and
also give ourselves a special custom <C-x> mapping.
Just experimenting for now. Figured out how to get this to work using a
test `ASDF` function along with these resources:
* http://stackoverflow.com/questions/15643234/remapping-tab-completions-in-vim
* https://github.com/ervandew/supertab/blob/master/plugin/supertab.vim
* http://stackoverflow.com/questions/6926034/creating-a-mapping-for-insert-mode-but-not-for-autocomplete-submode
It works. The only problem is that we can't restore the old
`completefunc` value. Thinking about ways to do this, and for now my
most promising idea is to use the `CursorMovedI` autocommand.
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