Get filename from metadata, add gg sans

flake.nix

@@ -13,34 +13,42 @@
     with builtins;
     with nixpkgs.lib;
       flake-utils.lib.eachDefaultSystem (system: let
-        pkgs = import nixpkgs {inherit system;};
+        pkgs = import nixpkgs {
+          inherit system;
+          config.allowUnfree = true;
+        };
+
+        pathEndsWith = suffix: path: let
+          str = toString path;
+          sufLen = stringLength suffix;
+          sLen = stringLength str;
+        in
+          sufLen <= sLen && suffix == substring (sLen - sufLen) sufLen str;
+
         buildFont = {
           name,
           files,
           license,
           author,
         }: let
-          pathEndsWith = suffix: path: let
+          copyType = extension: pathName: let
-            str = toString path;
-            sufLen = stringLength suffix;
-            sLen = stringLength str;
-          in
-            sufLen <= sLen && suffix == substring (sLen - sufLen) sufLen str;
-
-          installType = extension: pathName: let
             filteredFiles = filter (pathEndsWith ("." + extension)) files;
-            filename = file: lists.last (strings.splitString "/" (toString file));
           in
             (optionalString (filteredFiles != []) "mkdir -p $out/share/fonts/${pathName}\n")
-            + concatStringsSep "\n" (map (file: "cp -v ${file} $out/share/fonts/${pathName}/${filename file}") filteredFiles);
+            + concatStringsSep "\n" (map (file: ''
+                filename=$(${pkgs.fontconfig}/bin/fc-query -f %{postscriptname} ${file}).${extension}
+                cp -v ${file} $out/share/fonts/${pathName}/$filename
+              '')
+              filteredFiles);
         in
           pkgs.stdenvNoCC.mkDerivation {
             inherit name;
 
             dontUnpack = true;
             installPhase = ''
-              ${installType "ttf" "truetype"}
+              ${copyType "ttf" "truetype"}
-              ${installType "otf" "opentype"}
+              ${copyType "otf" "opentype"}
+              ${copyType "woff2" "woff2"}
             '';
 
             meta = {
@@ -57,10 +65,16 @@
             license = licenses.cc-by-40;
             author = "Matthew Anderson";
           }
+          {
+            name = "gg sans";
+            files = [./ggsans-Normal.woff2 ./ggsans-Medium.woff2 ./ggsans-SemiBold.woff2];
+            license = licenses.unfree;
+            author = "Colophon Foundry";
+          }
         ];
       in {
         packages = listToAttrs (map (font: {
-            name = toLower font.name;
+            name = replaceStrings [" "] ["-"] (toLower font.name);
             value = buildFont font;
           })
           fonts);