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I'm setting up an environment to automatically recompile .tex files on save. I've found solution for this:
autocmd BufWritePost *.tex :! latexmk -pdf
But is there any better way to do this? It seems like *.tex check will be executed every time I save a file, be it .c or .md file (maybe I'm wrong about this). Could I possibly place this option somewhere so it is executed only when I save .tex files? Something like ftplugin/tex.vim (I couldn't make it working there).
Ftplugin is the right way to go you simply didn't use the right file.
When you open a test.tex file and use set ft? the result is plaintex.
So you need to put your code in ftplugin/plaintex.vim
And I would advise to put it in ~/.vim/after/ftplugin/plaintex.vim this way you are sure that you don't override already existing ftplugins.
You might want to read :h ftplugin-name and :h ftplugin-overrule
<buffer> pattern