[MacPorts] #36135: gnuplot enhancement to support emacs-app

[MacPorts]

#36135: gnuplot enhancement to support emacs-app
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  Reporter:  jrh@…        |      Owner:  mojca.miklavec.lists@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.1.2
Resolution:               |   Keywords:  haspatch
      Port:  gnuplot      |
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Comment (by jrh@…):

 Eh, I have the impression that emacs-app-devel is obsolete anyway. It's a
 CVS snapshot from 2009, and the Emacs devs don't even use that repository
 anymore. IIRC, originally it was ahead of the point release used by emacs-
 app, providing early access to new functionality that eventually made it
 into Emacs 23. But now I'm not really sure what purpose it serves.

 Regardless, since either way the binary ends up in the same place, that
 gave me the idea to see how "port provides $filename" works. What about
 something like:
 {{{
 variant emacs description "An emacs mode for working with gnuplot" {
     set app_binary ${applications_dir}/Emacs.app/Contents/MacOS/Emacs
     set app_provider [registry_file_registered $app_binary]
     if {[file exists $app_binary] && $app_provider != 0} {
         depends_build-append port:${app_provider}
         configure.env-append EMACS=${app_binary}
     } else {
         depends_build-append path:bin/emacs:emacs
     }
     configure.args-delete   --without-lisp-files
     configure.args-append   --with-lisp-files --with-
 lispdir=${prefix}/share/emacs/site-lisp
 }
 }}}
 That appears to work for me with emacs-app:
 {{{
 $ port deps gnuplot +emacs
 Full Name: gnuplot @4.6.0_2+aquaterm+emacs+luaterm+pangocairo+x11
 Build Dependencies:   emacs-app
 Library Dependencies: expat, fontconfig, gd2, jpeg, pdflib, libiconv,
 libpng,
                       ncurses, readline, zlib, aquaterm, xpm, lua, pango
 }}}
 If I edit $app_binary to point to a nonexistent file, then the build
 dependency changes to emacs.

-- 
Ticket URL: <https://trac.macports.org/ticket/36135#comment:14>
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