Merge pull request #7119 from joachifm/gnu-smalltalk-emacs-support

gnu-smalltalk: optional emacs support

pkgs/development/compilers/gnu-smalltalk/default.nix

···
 { stdenv, fetchurl, pkgconfig, libtool, zip, libffi, libsigsegv, readline, gmp,
-gnutls, gnome, cairo, SDL, sqlite }:
+gnutls, gnome, cairo, SDL, sqlite, emacsSupport ? false, emacs ? null }:
+
+assert emacsSupport -> (emacs != null);
 
 let # The gnu-smalltalk project has a dependency to the libsigsegv library.
     # The project ships with sources for this library, but deprecated this option.
···
   buildInputs = [
     pkgconfig libtool zip libffi libsigsegv-shared readline gmp gnutls gnome.gtk
     cairo SDL sqlite
-  ];
+  ]
+  ++ stdenv.lib.optional emacsSupport emacs;
+
+  configureFlags = stdenv.lib.optional (!emacsSupport) "--without-emacs";
 
-  configureFlags = [ "--without-emacs" ];
+  installFlags = stdenv.lib.optional emacsSupport "lispdir=$(out)/share/emacs/site-lisp";
 
   # For some reason the tests fail if executated with nix-build, but pass if
   # executed within nix-shell --pure.

pkgs/top-level/all-packages.nix

···
     inherit fetchurl stdenv;
   });
 
-  gnu-smalltalk = callPackage ../development/compilers/gnu-smalltalk { };
+  gnu-smalltalk = callPackage ../development/compilers/gnu-smalltalk {
+    emacsSupport = config.emacsSupport or false;
+  };
 
   gccgo = gccgo48;