Indentation functions for vim

indentation.vim

"------------------------------------------------------------
" Indentation options {{{1
"

let g:mytabcolumns = 4

set noexpandtab
set softtabstop=0
set shiftwidth=4
set tabstop=4

function! ToggleTabMode()
	if &expandtab
		set noexpandtab
		set softtabstop=0
		echom "Using tabs for indentation"
	else
		set expandtab
		let &softtabstop=g:mytabcolumns
		echom "Using spaces for indentation"
	endif
endfunction

function! TabColumns(n)
	let g:mytabcolums=a:n
	let &tabstop=a:n
	let &shiftwidth=a:n
	if &expandtab
		let &softtabstop=a:n
	endif
endfunction

function! HighlightIndentation()
	call clearmatches()
	if &expandtab
		echom "Using spaces for indentation"
		call matchadd("Error", "^\t\t*")
	else
		echom "Using tabs for indentation"
		call matchadd("Error", "^  *")
	endif
endfunction

command! -nargs=1 Spaces call TabColumns(<f-args>) 

nnoremap <Leader>j<Space> :Spaces 
nnoremap <Leader><Tab> :call ToggleTabMode()<cr>
nnoremap <Leader><Space> :call HighlightIndentation()<cr>