Re: Get expansion of digraph in VimL

On 23/05/14 13:19, John Little 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
>
> 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
>

Note that nothing forbids having more than one digraph for the same
character, and in fact by default some characters have both an RFC1345
digraph and a "legacy Vim" digraph (as the latter was used before Vim
digraphs were standardized to RFC1345). Having more than one character
for a single digraph, however, is of course not possible: trying to
define a new equivalent for an existing digraph replaces it.

The above function would always return the last character-pair in the
list for any given character, for instance (with the default digraphs)
n~ (the legacy digraph) and not n? (the RFC1345 digraph) for U+00F1
LATIN SMALL LETTER N WITH TILDE. (Any previous digraph for the same
character would be replaced when creating the Dictionary.)


Best regards,
Tony.
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