Re: how to handle 'statusline' content with a variable ?

--------message d'origine --------
De: Marcin Szamotulski <mszamot@gmail.com>
En apparence venant de: vim_use+bncBD3O3BGAWUBBB3FLZWCQKGQEHCA43BQ@googlegroups.com
A: vim_use@googlegroups.com
Sujet: Re: how to handle 'statusline' content with a variable ?
Date: Mon, 26 Nov 2012 11:43:36 +0000

> On 12:13 Mon 26 Nov , bilibop project wrote:
> > Hi,
> >
> > In my .vimrc, I conditionally set the statusline, and store it into a variable
> > to use this variable later in autocommands, like this:
> >
> > ========== BEGIN =================================================================
> > [...]
> > set statusline&
> > if &filetype!="help" && &filetype!="netrw" && &filetype!="nerdtree" && &filetype!="conque_term" && &filetype!="qf"
> > " Display (truncated) full path of the file with 'User1' highlight settings:
> > setlocal statusline+=%1*%<%F
> > " Add 'modified' and 'readonly' optional flags with 'User2' highlight settings:
> > setlocal statusline+=%2*%m%r%1*
> > " Divider of the line (what follows it is right aligned):
> > setlocal statusline+=%=
> > " Display the number of the buffer with 'User3' highlight settings:
> > setlocal statusline+=%3*%a%1*
> > " Align and display the file type (or 'none') with 'User4' highlight settings:
> > setlocal statusline+=%16.(%4*[%{strlen(&filetype)?&filetype:'none'}]%)
> > " Display file format and file encoding (or default encoding) with 'User5'
> > " highlight settings:
> > setlocal statusline+=%5*[%{&fileformat},\ %{strlen(&fileencoding)?&fileencoding:&encoding}]%1*
> > " Align and display ASCII and Hex values of the character under the cursor
> > " with 'User6' highlight settings:
> > setlocal statusline+=%16.(%6*<%03.5b>\ <0x%02.4B>%)%1*
> > " Align and display the position of the cursor with 'User7' highlight settings:
> > setlocal statusline+=%16.(%7*%l/%L,%c%V%)\ (%P)
> > endif
> > " Store it into a variable to use it later in autocommands; don't forget
> > " to escape spaces and percent signs, and escape the backslashes themselves:
> > [The following is on one line:]
> > let local_stl="\\%1*\\%<\\%F\\%2*\\%m\\%r\\%1*\\%=\\%3*\\%a\\%1*\\%16.(\\%4*[\\%{strlen(&filetype)?&filetype:'none'}]\\%)\\%5*[\\%{&fileformat},\\ \\%{strlen(&fileencoding)?&fileencoding:&encoding}]\\%1*\\%16.(\\%6*<\\%03.5b>\\ <0x\\%02.4B>\\%)\\%1*\\%16.(\\%7*\\%l/\\%L,\\%c\\%V\\%)\\ (\\%P)"
> > [...]
> > autocmd BufLeave,TabLeave,WinLeave * setlocal statusline&
> > autocmd BufEnter,TabEnter,WinEnter * if &filetype=="help" || &filetype=="netrw" || &filetype=="nerdtree" || &filetype=="conque_term" || &filetype=="qf" | setlocal statusline& | else | exe "setlocal statusline=" . local_stl | endif
> > [...]
> > ========== END ===================================================================
> >
> > Then, the default statusline is displayed for 'help', 'nerdtree', 'quickfix', and so on, and the custom statusline is displayed for all other filetypes, but only if it is the active buffer/tab/window. All this works as I want. But if I want to modify something in the very clear (and commented) 'setlocal statusline+=' lines, I have to do the same changes in the obscure 'local_stl' variable. So, what I need is a way to define 'local_stl' by using the '&statusline' content instead of manually; more precisely: how to handle '&statusline' to add escape characters and put the result in my 'local_stl' variable ? I have tried:
> >
> > let local_stl=substitute(&statusline, "\([% ]\)", "\\\\\1", "g")
> >
> > but this leads to an error:
> > Error detected while processing BufEnter Auto commands for "*":
> > E518: Unknown option: %{strlen(&fileencoding)?&fileencoding:&encoding}]%1*%16.(%6*<%03.5b>
> > Error detected while processing TabEnter Auto commands for "*":
> > E518: Unknown option: %{strlen(&fileencoding)?&fileencoding:&encoding}]%1*%16.(%6*<%03.5b>
> > Error detected while processing WinEnter Auto commands for "*":
> > E518: Unknown option: %{strlen(&fileencoding)?&fileencoding:&encoding}]%1*%16.(%6*<%03.5b>
> >
> > and the related part of the statusline (and all what follows) is not displayed.
> > It seems the problem is that the space characters behave as separators in the 'local_stl' when used as argument for the 'exe' command, even if they have been escaped before. I don't know how to deal with that.
> >
> > Idea?
> > Thanks,
> > quidame
> >
> > --
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> Hi,
>
> You can define a variable local_stl and then do:
>
> setl statusline=%!local_stl
>
> Is this what you need?
>
> Cheers,
> Marcin

Yeah! This is what I need. Thank you very much.
So now I have:

set statusline&
if <conditions>
setlocal statusline+=blahblah
setlocal statusline+=foobar
setlocal statusline+=whatever
setlocal statusline+=something
endif
let local_stl=&statusline
[...]
au BufLeave,TabLeave,WinLeave * setlocal statusline&
au BufEnter,TabEnter,WinEnter * if <conditions> | setlocal statusline& | else | setlocal statusline=%!local_stl | endif

Works perfectly: now I just have to add/modify/remove a
'setlocal statusline+=...' line to make new settings taken into account in the autocmd.

Cheers,
quidame

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