Python + vim + spaces vs tab

[Jean-Michel Pichavant]

Robin Becker wrote:
> On 07/06/2010 22:18, Hans Mulder wrote:
>> Jean-Michel Pichavant wrote:
>>> Hello,
>>>
>>> Does anyone knows a way to configure vim so it automatically select to
>>> correct expandtab value depending on the current buffer 'way of 
>>> doing' ?
>>> I need to edit different files, some are using spaces, others tabs.
>>> Those belong to different projects, and changing all spaces to tabs is
>>> not an option for me.
>>>
>>> I can't make vim automatically comply with the current buffer coding
>>> style, anyone knows if it is possible ?
>>
>> If you can't get vim to automatically recognize the different styles you
>> have to work with, then you could look into adding a "modeline" to each
>> file. Typing ":help modeline" in vim will tell you how they work.
>>
>> Adding such a line to each and every file may be a bit of work, and you
>> may have to convince other people working on the project that "explicit
>> is better than implicit".
>>
>> -- HansM
>>
>
> I use the following at the end of my vimrc
>>     [snip]
>
> the idea is to switch between using tabs and spaces depending on the 
> original source. If the input is all spaces we switch to tabs 
> internally and then convert on output. If it was tabbed we keep that, 
> if mixed I think it keeps that. This works for me as I often work with 
> long latency connections and prefer tabs to spaces.

Thanks, this is no exactly what I needed, but from your code I managed 
to write something that suits me.
It basically counts the occurrence of tabs and 4-spaces at the beginning 
of lines, and use the greatest number as criterion for setting tab or 
space mode
Something usefull is to get also the current mode in the status bar.

Because of my poor knowledge of the vim scripting language I sometimes 
had to switch to python, but I guess it won't bother anyone in this list :)


set statusline=%t\ %y\ format:\ %{&ff};\ %{Statusline_expandtab()}\ [%c,%l]

function! Statusline_expandtab()
    if &expandtab == 0
        return "ind:tabs"
    else
        return "ind:space"
    endif
endfunction

autocmd BufAdd,BufFilePost,BufReadPost,FileReadPost,FilterReadPost 
*.py,*.pyw,<PYTHON;python> call s:guessType()

function! WordCount(word)
python <<EOF
 
import vim
import re

word = vim.eval("a:word")
txt = '\n'.join(vim.current.buffer[:])
match = re.findall(word, txt)
count = len(match)
vim.command("let l:_count=%s" % count)
EOF
    return l:_count
endfunction

function! s:guessType()
    let _tab = WordCount('\n\t')
    let _space = WordCount('\n    ')
    if _tab > _space
        set noexpandtab
    else
        set expandtab
    endif
endfunction