Vim highlights long lines for all files

Question

I have the following setting in my .vimrc for highlight long lines (>79) for python files

augroup vimrc_autocmds
    autocmd!
    autocmd FileType python,rst highlight Excess ctermbg=DarkGrey  guibg=Black
    autocmd FileType python,rst match Excess /\%79v.*/
    autocmd FileType python,rst set nowrap
augroup END

By some reason Vim highlights also other files (like .robot).

How can I fix this?

Answer 1

According to :help :match, it Define a pattern to highlight in the current window.. Thus if you open any other buffer (file) on the same window it will also display the highlight.

You would be better off by extending the syntax highlight for some languages, as explained at Vim FAQ 24.11. "How do I add my own syntax extensions to the standard syntax files supplied with Vim?".

Another option is to use the autocmd events BufEnter to set the match and BufLeave to clear it.

In any case, you could avoid cluttering your vimrc by using ftplugins, as explained in here.