[MacPorts] #38740: sml-mode.el enhancement to support Emacs.app

[MacPorts]

#38740: sml-mode.el enhancement to support Emacs.app
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 Reporter:  jrh@…        |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.1.3
 Keywords:               |       Port:  sml-mode.el
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 The attached patch will enable building sml-mode.el with Emacs.app without
 requiring the '''emacs''' port to be installed.

 Rather than creating an '''app''' variant, I follow the gnuplot port's
 example of searching for
 `${applications_dir}/Emacs.app/Contents/MacOS/Emacs`, and if that does not
 exist then falling back to `${prefix}/bin/emacs`.  Either way, the files
 are installed to `${prefix}/share/emacs/site-lisp`, and '''emacs''' will
 properly be a dependency if that path does not exist yet.

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Ticket URL: <https://trac.macports.org/ticket/38740>
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