Re: Get expansion of digraph in VimL

On May 25, 2014 4:24 AM, "Tony Mechelynck" <antoine.mechelynck@gmail.com> wrote:
>
> 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.)

?! Quoted functions solve forward problem: given n? return U+00F1, not backward: given U+00F1 return n?.

>
>
> Best regards,
> Tony.
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