emacs: factor meta

Because metadata pertains to the source code variants, not to the build logic.

pkgs/applications/editors/emacs/generic.nix

@@ -3,6 +3,7 @@
 , variant
 , src
 , patches ? _: [ ]
+, meta
 }:
 
 { lib
@@ -391,44 +392,7 @@ mkDerivation (finalAttrs: (lib.optionalAttrs withNativeCompilation {
     treeSitter = builtins.trace "emacs.passthru: treeSitter was renamed to withTreeSitter and will be removed in 23.11" withTreeSitter;
   };
 
-  meta = {
-    homepage = if variant == "macport"
-               then "https://bitbucket.org/mituharu/emacs-mac/"
-               else "https://www.gnu.org/software/emacs/";
-    description = "The extensible, customizable GNU text editor"
-                  + lib.optionalString (variant == "macport") " - with macport patches";
-    longDescription = ''
-      GNU Emacs is an extensible, customizable text editor—and more. At its
-      core is an interpreter for Emacs Lisp, a dialect of the Lisp programming
-      language with extensions to support text editing.
-
-      The features of GNU Emacs include: content-sensitive editing modes,
-      including syntax coloring, for a wide variety of file types including
-      plain text, source code, and HTML; complete built-in documentation,
-      including a tutorial for new users; full Unicode support for nearly all
-      human languages and their scripts; highly customizable, using Emacs Lisp
-      code or a graphical interface; a large number of extensions that add other
-      functionality, including a project planner, mail and news reader, debugger
-      interface, calendar, and more. Many of these extensions are distributed
-      with GNU Emacs; others are available separately.
-    ''
-    + lib.optionalString (variant == "macport") ''
-
-      This release is built from Mitsuharu Yamamoto's patched, MacOS X-specific
-      source code.
-    '';
-    license = lib.licenses.gpl3Plus;
-    maintainers = with lib.maintainers; [
-      AndersonTorres
-      adisbladis
-      atemu
-      jwiegley
-      lovek323
-      matthewbauer
-    ];
-    platforms = if variant == "macport"
-                then lib.platforms.darwin
-                else lib.platforms.all;
+  meta = meta // {
     broken = !(stdenv.buildPlatform.canExecute stdenv.hostPlatform);
   };
 }))

pkgs/applications/editors/emacs/sources.nix

@@ -3,6 +3,37 @@
 , fetchFromSavannah
 }:
 
+let
+  mainlineMeta = {
+    homepage = "https://www.gnu.org/software/emacs/";
+    description = "The extensible, customizable GNU text editor";
+    longDescription = ''
+      GNU Emacs is an extensible, customizable text editor—and more. At its core
+      is an interpreter for Emacs Lisp, a dialect of the Lisp programming
+      language with extensions to support text editing.
+
+      The features of GNU Emacs include: content-sensitive editing modes,
+      including syntax coloring, for a wide variety of file types including
+      plain text, source code, and HTML; complete built-in documentation,
+      including a tutorial for new users; full Unicode support for nearly all
+      human languages and their scripts; highly customizable, using Emacs Lisp
+      code or a graphical interface; a large number of extensions that add other
+      functionality, including a project planner, mail and news reader, debugger
+      interface, calendar, and more. Many of these extensions are distributed
+      with GNU Emacs; others are available separately.
+    '';
+    license = lib.licenses.gpl3Plus;
+    maintainers = with lib.maintainers; [
+      AndersonTorres
+      adisbladis
+      atemu
+      jwiegley
+      lovek323
+      matthewbauer
+    ];
+    platforms = lib.platforms.all;
+  };
+in
 {
   emacs28 = import ./generic.nix {
     pname = "emacs";
@@ -13,6 +44,8 @@
       rev = "28.2";
       hash = "sha256-4oSLcUDR0MOEt53QOiZSVU8kPJ67GwugmBxdX3F15Ag=";
     };
+
+    meta = mainlineMeta;
   };
 
   emacs29 = import ./generic.nix {
@@ -24,6 +57,8 @@
       rev = "29.0.92";
       hash = "sha256-Vkry+2zYejZVwZKQlmQiAJnbjsj87DiIZ1ungooYd8A=";
     };
+
+    meta = mainlineMeta;
   };
 
   emacs-macport = import ./generic.nix {
@@ -36,5 +71,17 @@
       rev = "emacs-28.2-mac-9.1";
       hash = "sha256-Ne2jQ2nVLNiQmnkkOXVc5AkLVkTpm8pFC7VNY2gQjPE=";
     };
+
+    meta = {
+      homepage = "https://bitbucket.org/mituharu/emacs-mac/";
+      description = mainlineMeta.description + " - with macport patches";
+      longDescription = mainlineMeta.longDescription + ''
+
+        This release is built from Mitsuharu Yamamoto's patched source code
+        tailoired for MacOS X.
+      '';
+      inherit (mainlineMeta) license maintainers;
+      platforms = lib.platforms.darwin;
+    };
   };
 }