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I would like to be able to implement the following logic.

(if (developer-opened-file-with-emacs)
    (do nothing, get on with working as fast as possible)
    (load fancy splash screen that may take a while))

What would be a good way to detect this case so that I may use this to choose what kind of startup behavior to use?

Another way to say this is: Will emacs show *scratch* buffer once it's started.


Examples of opening emacs with a file include:

emacs somefile.txt

Or using elisp:

emacs --eval '(progn (find-file "test.txt"))'

Note that checking argv isn't a good option since elisp may be used in a command line argument to open files.

  • How did the developer open a file with Emacs; e.g., double-clicking on a file (with an extension associated with Emacs) from Finder.app on OSX and Emacs was built --with-ns? – lawlist Feb 13 '18 at 0:02
  • Generally I don't think it should matter? To avoid ambiguity, I added examples using argument or elisp. (not sure of other ways) – ideasman42 Feb 13 '18 at 0:07
  • 2
    Hm, maybe your predicate is (cl-remove-if-not #'buffer-file-name (buffer-list)). But maybe there is some history mechanism interfering which opens the last file buffers automagically... – Tobias Feb 13 '18 at 1:27
  • Checking buffer-file-name works as long as this isn't in the body of the init file (worth adding as an answer?) – ideasman42 Feb 14 '18 at 3:56

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