squash! feat: Add a function for building ELPA-compatible archives

Author: akirak

pkgs/build-support/elisp/convertToElpaArchive.nix

@@ -7,7 +7,7 @@
   ename,
   version,
   meta,
-  sourceInfo,
+  sourceInfo ? null,
   packageRequires,
   # There are some missing attributes desired for the package description, but
   # omit them for now.
@@ -25,6 +25,10 @@ let
     + ")";
 
   hasInfo = builtins.elem "info" drv.outputs;
+
+  commitInfo = lib.optionalString (sourceInfo != null && sourceInfo ? rev) ''
+    :commit "${sourceInfo.rev}"
+  '';
 in
 runCommand "${ename}-${version}"
   {
@@ -33,7 +37,7 @@ runCommand "${ename}-${version}"
     pkgDescription = ''
       (define-package "${ename}" "${version}" "${meta.description}"
         '${attrsToLispAlist packageRequires}
-        :commit "${sourceInfo.rev}")
+        ${commitInfo})
       ;; Local Variables:
       ;; no-byte-compile: t
       ;; End: