2017-01-30 Current Emacs version

When mailing to the Emacs devs about bugs, you should obviously mention the version of Emacs you are using. This is usually done with M-x emacs-version, which displays the version info in the minibuffer (or inserts it at point when invoked with a prefix argument). However, if you happen to use a development version of Emacs, compiled from source, this is not very meaningful – it does not contain any information about the actual commit hash. I asked about it on the mailing list, and learned about the emacs-repository-get-version funtion (which is not interactive, btw), which returns the VCS’s idea of the “current version” (nowadays it is just Git’s commit hash).

In fact, since I happen to report Emacs bugs once in a while, I have this in my init.el:

(defun insert-debug-version-info ()
  "Insert version of Emacs and 7 characters of the commit hash."
  (interactive)
  (insert
   (format "GNU Emacs %s (commit %s)"
	   emacs-version
	   (substring (emacs-repository-get-version) 0 7))))

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