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If you want to introduce a file type and that file type can only be identified by examining the contents of such files then you'll need to add appropriate logic to a file named scripts.vim. But first, let's take a step back and look at the broader picture. File type detection is enabled with the command :filetype on (this is usually added to your vimrc file)....


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In the end, the comments above were very helpful in narrowing down the problem - thanks, everyone! I've resolved it now, and the filetype is only set once. To summarize, there were several issues here: The problem only affected Markdown files, which I didn't originally realise - sorry for not being more thorough in my original problem determination. This ...


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You can create $HOME/.vim/scripts.vim of your own, as $VIMRUNTIME/filetype.vim will source it by executing :runtime! scripts.vim if needed. It's enough to put only these lines: if getline(1) =~# '^Client:.' setf veltxt endif Note that .* at the end of a pattern does nothing (always matches).


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Yes, you should be able to set the filetype based on the contents of the file. If you add a script to the ftdetect directory, this script should set up a new autocmd to trigger when a file of a specific extension or file name pattern (or * if any file name is possible) is opened and then set the appropriate filetype there. The autocmd can then set the ...


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