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

[MacPorts]

#36135: gnuplot enhancement to support emacs-app
-------------------------+--------------------------------
 Reporter:  jrh@…        |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.1.2
 Keywords:               |       Port:  gnuplot
-------------------------+--------------------------------
 The attached Portfile patch adds a new '''emacs_app''' variant which is
 like the '''emacs''' variant but uses Emacs.app. It ''almost'' suffices to
 just modify the existing "emacs" variant replacing
 {{{
     depends_build-append    path:bin/emacs:emacs
 }}}
 with
 {{{
     depends_build-append    path:share/emacs/site-lisp:emacs
 }}}
 but then it ends up using the (older) system /usr/bin/emacs for
 compilation (which works, but is Wrong).

 The "configure.env-append" part sets $EMACS to the Emacs.app executable.
 We also have to update $PATH because of the gnuplot ./lisp/configure
 script which does this
 {{{
 EMACS=`basename $EMACS`
 }}}
 and then proceeds to call
 {{{
 $EMACS --version
 }}}
 which, depending upon file system case sensitivity, either erroneously
 finds /usr/bin/emacs (as /usr/bin/Emacs) or fails outright.

 The "pre-configure" block edits ./lisp/configure to recognize "Emacs" as
 well as "emacs" as a valid executable name for GNU Emacs.

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