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I've been using the vim-surround plugin for as long as I can remember and have grown accustomed to typing <c-g>s ) when I want to insert text between brackets. I was writing with the atom editor recently and kind of liked the fact that the editor always inserts a closing bracket if you type an opening one. I realized that producing a similar effect in vim is trivial: I can just use the following mappings:

imap ( ()<c-o>i
imap [ []<c-o>i
imap { {}<c-o>i

This seemed so obvious that I started wondering why I haven't seen this done very often in people's vimrcs. Are there some possible conflicts / pitfalls related to this?

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Well, for one it does not work very well with Repeating using .. That means, if you create a new buffer start insert mode and type (foobar your buffer will show (foobar). How redo the thing using .. It will redo only foobar.

I thought it would also break the undo sequence, but that does not seem to happen.

To fix the . repeating issue, I suggest to use:

inoremap ( ()<c-g>U<left>

That needs support for <C-G>U in insert mode which has been included in a late Vim 7.4 patch to work and has been requested a couple of years ago on vim_dev.

There might be other gotchas (or people in general just use a snippet/completion plugin instead) and do not care about the details :))

  • I'm intrigued as to how your fix works. Any chance of an explanation? (A pointer to where to look in the source would be fine: it doesn't seem self-evident to me that undo and . would share code.) – Rich May 10 '18 at 9:24
  • @Rich Sorry, I did not follow, you want an explanation of what the patch did that implemented \<C-G>U? – Christian Brabandt May 10 '18 at 16:39

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