I noticed that if I open a non-existent HTML file with Vim, the filetype is set automatically to html
:
$ vim foobar.html
:set filetype # --> filetype=html
On the other hand, the same does not happen with TeX. If I create a non-existent file the filetype is plaintext
, and I have to save the file and reopen it to have it correctly set:
$ vim blabla.tex
:set filetype # --> filetype=plaintext
I also tried with Python, C, VimL, Javascript files and the filetype is always set right away. I don't know why this does not happen with TeX files.
The only thing I can think might interfere is vim-latex
. Could that be possible? If so, how do I fix this problem?
If it might be of help, here is my not so long .vimrc
file.
Vim uses a giant heuristic to determine plaintex vs other variations of tex.
If you look in $VIMRUNTIME/filetype.vim
you will find the following function
" Choose context, plaintex, or tex (LaTeX) based on these rules:
" 1. Check the first line of the file for "%&<format>".
" 2. Check the first 1000 non-comment lines for LaTeX or ConTeXt keywords.
" 3. Default to "latex" or to g:tex_flavor, can be set in user's vimrc.
func! s:FTtex()
let firstline = getline(1)
if firstline =~ '^%&\s*\a\+'
let format = tolower(matchstr(firstline, '\a\+'))
let format = substitute(format, 'pdf', '', '')
if format == 'tex'
let format = 'plain'
endif
else
" Default value, may be changed later:
let format = exists("g:tex_flavor") ? g:tex_flavor : 'plain'
" Save position, go to the top of the file, find first non-comment line.
let save_cursor = getpos('.')
call cursor(1,1)
let firstNC = search('^\s*[^[:space:]%]', 'c', 1000)
if firstNC " Check the next thousand lines for a LaTeX or ConTeXt keyword.
let lpat = 'documentclass\>\|usepackage\>\|begin{\|newcommand\>\|renewcommand\>'
let cpat = 'start\a\+\|setup\a\+\|usemodule\|enablemode\|enableregime\|setvariables\|useencoding\|usesymbols\|stelle\a\+\|verwende\a\+\|stel\a\+\|gebruik\a\+\|usa\a\+\|imposta\a\+\|regle\a\+\|utilisemodule\>'
let kwline = search('^\s*\\\%(' . lpat . '\)\|^\s*\\\(' . cpat . '\)',
\ 'cnp', firstNC + 1000)
if kwline == 1 " lpat matched
let format = 'latex'
elseif kwline == 2 " cpat matched
let format = 'context'
endif " If neither matched, keep default set above.
" let lline = search('^\s*\\\%(' . lpat . '\)', 'cn', firstNC + 1000)
" let cline = search('^\s*\\\%(' . cpat . '\)', 'cn', firstNC + 1000)
" if cline > 0
" let format = 'context'
" endif
" if lline > 0 && (cline == 0 || cline > lline)
" let format = 'tex'
" endif
endif " firstNC
call setpos('.', save_cursor)
endif " firstline =~ '^%&\s*\a\+'
" Translation from formats to file types. TODO: add AMSTeX, RevTex, others?
if format == 'plain'
setf plaintex
elseif format == 'context'
setf context
else " probably LaTeX
setf tex
endif
return
endfunc
This function determines which flavor of tex to use. If you look at it you can see that default value is taken from g:tex_flavor
(if it exists, defaults to plain). If you set this variable to tex (in you vimrc), vim will default to the tex filetype.
let g:tex_flavor = 'tex'
There is a way to automate the process you're doing manually.
Adding autocmd BufRead,BufNewFile *.tex set filetype=tex
to your .vimrc
file will set tex
filetype for each tex file, once you open them in vim.
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