Re: Get expansion of digraph in VimL

On May 23, 2014 3:19 PM, "John Little" <John.B.Little@gmail.com> wrote:
>
> On Friday, May 23, 2014 10:36:56 AM UTC+12, Nate Soares wrote:
> > Is there a way to get the expansion of a digraph (entered e.g. with ^K in insert mode) programatically?
>
> There isn't a vim script way to do this directly.  I can think of two ways, one somewhat unclean, the other pedestrian.
>
> Firstly, this approach may have side effects, might spoil your screen layout, and harm innocent animals:
>
> function! ExpandDigraph(dig)
>     if a:dig !~ '^..$'
>         return ""
>     endif
>     new
>     exe "norm! a\<c-k>" . a:dig . "\<esc>"
>     let result = getline(".")
>     close!
>     return result
> endfunc

Digraphs work also in Ex mode. So I would rather use it, CTRL-\ e and getcmdline() are your friends here: this way there are no or almost no side-effects. At least I do not know any side-effects other then inevitable things like heating the processor a bit. Example I used to test CTRL-K . . expansion:

    execute 'normal!' ":\<C-k>..\<C-\>eextend(g:, {'digraph': getcmdline()}).digraph\n"

This even did not alter cmd and expr history (it would if I typed :normal! argument myself).

>
> Secondly: capture the output of the command :digraph, (:help redir) and reformat it to one column (that's tricky because there's lots of funny characters), and write it to a file, say "digraphs.txt".  Then,
>
> function! ExpandDigraph(dig)
>     if !exists("s:digs")
>         let s:digs = {}
>         for line in readfile("digraphs.txt")
>             let s:digs[line[0:1]] = line[3:]
>         endfor
>     endif
>     return has_key(s:digs, a:dig) ? s:digs[a:dig] : ""
> endfunc
>
> > For example, I have vim set up to insert the ellipsis character '…' when I type "^K..". Is there a way, programatically, to write a function ExpandDigraph such that ExpandDigraph("..") yields "…"?
>
> BTW, with my vim 7.4.274 on linux ".." is a digraph for "‥" U+2025 TWO DOT LEADER, not an ellipsis, "…" U+2026 HORIZONTAL ELLIPSIS. My vim only has digraphs for U+22EF MIDLINE HORIZONTAL ELLIPSIS and U+22EE VERTICAL ELLIPSIS.  If you've defined your own digraphs, and you use my second approach you'd have to add yours to the file.
>
> Regards, John Little
>
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