Hi Vim developers,
I found a discrepancy between the two methods for custom insert-mode completion,
'completefunc' and complete(). The latter doesn't respect the ':set
completeopt+=longest' setting; its completions always expand to the first match,
not just the longest common text of matches.
I see no reason for not observing that setting, and think that this is a bug in
the complete() function.
This can be reproduced starting from Vim 7.0 up to 7.2.323, on Windows/x86 and
Linux/x86.
To reproduce, source attached file, which contains both types of
(calendar-month) completion functions, taken from the Vim help:
vim -N -u NONE
:source complete(func).vim
iM<F5><CR>
M<F6><CR><Esc>
" Both complete() and 'completefunc' expand to the first match, "March".
:set completeopt+=longest
iM<F5><CR>
M<F6><CR>
" complete() still expands to the full first match, "March".
" 'completefunc' correctly just inserts the longest common string, "Ma".
-- regards, ingo
PS: Speaking of discrepancies, another glaring one is that complete() takes
{startCol}, so range is [1, col('.')], but 'completefunc' has a zero-based range
of [0, col('.')[. Sadly, it would be even more stupid to change any of those two
now to correct the inconsistency.
--
-- Ingo Karkat -- /^-- /^-- /^-- /^-- /^-- /^-- http://ingo-karkat.de/ --
-- http://vim.sourceforge.net/account/profile.php?user_id=9713 --
inoremap <F5> <C-R>=ListMonths()<CR>
func! ListMonths()
" locate the start of the word
let line = getline('.')
let start = col('.') - 1
while start > 0 && line[start - 1] =~ '\a'
let start -= 1
endwhile
" find months matching with "base"
let base = strpart(line, start, (col('.') - start))
let res = []
for m in ['January', 'February', 'March', 'April', 'May', 'June', 'July',
'August', 'September', 'October', 'November', 'December']
if m =~ '^' . base
call add(res, m)
endif
endfor
call complete(start + 1, res)
return ''
endfunc
fun! CompleteMonths(findstart, base)
if a:findstart
" locate the start of the word
let line = getline('.')
let start = col('.') - 1
while start > 0 && line[start - 1] =~ '\a'
let start -= 1
endwhile
return start
else
" find months matching with "a:base"
let res = []
for m in ['January', 'February', 'March', 'April', 'May', 'June', 'July',
'August', 'September', 'October', 'November', 'December']
if m =~ '^' . a:base
call add(res, m)
endif
endfor
return res
endif
endfun
inoremap <F6> <C-o>:set completefunc=CompleteMonths<CR><C-x><C-u>
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