Re: Any automatic bracket-insertion plugins not breaking undo?

On Friday, January 16, 2015 at 3:57:37 AM UTC-6, Christian Brabandt wrote:
> Am 2015-01-15 15:53, schrieb Ben Fritz:
> > On Wednesday, January 14, 2015 at 10:37:15 AM UTC-6, Ben Fritz wrote:
> >> A feature I've been missing ever since just before Vim 7.4 came out,
> >> is
> >> the automatic closing of matched characters. E.g. if I insert abc(def
> >> I
> >> want to get abc(def|) where '|' denotes my cursor. Then if I type the
> >> closing ) I want my cursor to jump over the existing ) rather than
> >> inserting a second one.
> >>
> >>
> >> If that's all I wanted, some fairly simple mappings can do the job for
> >> me. But, after inserting "abc(def[ghi])", I want to be able to undo
> >> that
> >> insertion, and redo that insertion, and potentially even REPEAT that
> >> insertion, as if I had typed it all out manually in one insert.
> >
> > Incidentally, at the moment I'd settle for simply not breaking
> > undo/redo. If I want to repeat something I normally can prepare that
> > in advance by using <C-V> to avoid the mappings.
>
> That would need a change to the source, right? Did we ever talk about
> how to prevent this or what would have to be done, to not break undo?
> Is there an easy way to reproduce the issue without having to install
> some plugins?
>

Pretty much any of the methods at http://vim.wikia.com/wiki/Automatically_append_closing_characters

The problem is, there is no way to move the cursor in insert mode, without breaking the undo sequence. Such a capability would allow both of these mappings:

inore ( ()<Left>
inore <expr> ) GetNextChar()==")" ? "\<Right>" : ")"

Alternatively, there is no way in insert mode to insert a character after the cursor, or delete the character after the cursor. Such a capability would allow:

inore <expr> ( ")".PutCharAfter(")")
inore <expr> ) GetNextChar()==")" ? DeleteNextChar().")" : ")"

At one point, there was a workaround that exploited a bug in setline() that allowed the undo/redo to work. You could use setline() to change the line without breaking undo sequence. I don't remember how repeat worked, but I think it involved an <Esc> mapping.

If either the abilities above (moving the cursor without breaking undo, or insert/delete after the cursor) were implemented as Vim insert-mode commands, I would consider dropping the use of a plugin and just writing my own mappings.

As it is, I tried the pull request I mentioned on delimitMate, and it seems to work for simple cases, but either visual-block mode messes it up. I have an unsatisfactory workaround I posted as a comment on that pull request that I'm using for the present.

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