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Occasionally I use TRAMP mode to edit remote files.
I want to detect if the file open is remote, and if so, get the hostname of the server it's on.
I can't find any buffer-local variable that holds this information, though. tramp-current-host holds the hostname, but isn't buffer local.
Yes, calling file-remote-p is the proper way. If you want to see the hostname in the modeline, I recommend you to install tramp-theme from GNU ELPA.
I ended up finding it out shortly after posting this question.
(file-remote-p default-directory 'host)
This works, returning nil if the file isn't remote, or the hostname if it is.
