[Vim-latex-devel] splitting lines

[Carl M. <cm...@ma...>]

Here is another feature which I would very much like to see.
Automatic splitting of lines is a great feature for editing.
On the other hand, it is a pain when an editor splits up a 
math expression $...$.  As part of auctex.vim, I wrote the
following function(s) which keep $...$ expressions on the
same line, while allowing the user to keep typing without
hitting <CR>.

Best wishes,
Carl Mueller

----------------------

" The following is necessary for TexFormatLine() and TexFill()
set tw=0
" substitute text width
let b:tw = 79

"  With this map, <Space> will split up a long line, keeping the dollar
"  signs together (see the next function, TexFormatLine).
inoremap <buffer> <Space> <Space><Esc>:call <SID>TexFill(b:tw)<CR>a
function! s:TexFill(width)
    if col(".") > a:width
	exe "normal a##\<Esc>"
	call <SID>TexFormatLine(a:width)
	exe "normal ?##\<CR>2s\<Esc>"
    endif
endfunction

function! s:TexFormatLine(width)
    normal $
    let length = col(".")
    let go = 1
    while length > a:width+2 && go
    let between = 0
    let string = strpart(getline(line(".")),0,a:width)
    " Count the dollar signs
    let evendollars = 1
    let counter = 0
    while counter <= a:width-1
	if string[counter] == '$' && string[counter-1] != '\'  " Skip \$.
	   let evendollars = 1 - evendollars
	endif
	let counter = counter + 1
    endwhile
    " Get ready to split the line.
    exe "normal " . (a:width + 1) . "|"
    if evendollars
    " Then you are not between dollars.
       exe "normal ?\\$\\| \<CR>W"
    else
    " Then you are between dollars.
	normal F$
	if col(".") == 1
	   let go = 0
	endif
    endif
    exe "normal i\<CR>\<Esc>$"
    let length = col(".")
    endwhile
endfunction