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
        if exists("loaded_python_tabs") || &cp || exists("#BufReadPre#*.py")
                finish
        endif

        augroup python_tabs
                " Remove all python_tabs autocommands
                au!
                autocmd BufWritePre,FileWritePre *.py,*.pyw,<PYTHON;python> 
call s:writepre()
                autocmd BufWritePost,FileWritePost *.py,*.pyw,<PYTHON;python> 
call s:writepost()
                autocmd BufAdd,BufFilePost,BufReadPost,FileReadPost,FilterReadPost 
*.py,*.pyw,<PYTHON;python> call s:readpost()
        augroup END
        fun s:readpost()
                if &expandtab
                        return
                endif
                let l = line(".")
                let c = col(".")
                let v:errmsg=""
                silent! /^\t
                let tabbed_python = v:errmsg==""
                silent nohls
                if !exists("b:was_tabbed_python")
                        let b:was_tabbed_python = tabbed_python
                endif
                if !tabbed_python
                        let mod_save=&modified
                        try
                                '[,']retab!
                        catch
                        endtry
                        let &l:modified=mod_save
                endif
                call cursor(l,c)
        endfun
        fun s:writepre()
                let b:tabs_expanded = 0
                if &expandtab || (exists("b:was_tabbed_python") && 
b:was_tabbed_python)
                        return
                endif
                setlocal expandtab
                execute "silent '[,']retab!"
                let s:ma_save = &ma
                setlocal ma
                let b:tabs_expanded = 1
        endfun
        fun s:writepost()
                if b:tabs_expanded
                        setlocal noexpandtab
                        execute "silent '[,']retab!"
                        let &l:ma = s:ma_save
                endif
                unlet b:tabs_expanded
        endfun
        let loaded_python_tabs = 1

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.
--
Robin Becker

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