bug#646: emacsclient with no args to behave like -a

[Lars Ingebrigtsen]

Jim Porter <jporterbugs@gmail.com> writes:

> From my reading, this is the original reporter's preferred behavior:
>
>   1) If Emacs is not currently running
>      a) `emacsclient file.txt' starts Emacs and opens file.txt
>      b) `emacsclient' starts Emacs (as though running `emacs')
>   2) If Emacs is currently running
>      a) `emacsclient file.txt' opens file.txt in the existing Emacs session
>      b) `emacsclient' brings some frame in the existing Emacs session
>      to the foreground

That's not my reading.  The bug reporter said "It would be nice if
emacsclient, when called with no arguments, would just run the alternate
editor."  I.e., emulate the "-a" parameter when called with no
parameters.

(He's also using Emacs as the alternate, but that's just a detail.)

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