add gayathri

flake.nix

@@ -12,18 +12,25 @@
       let
         pkgs = import nixpkgs { inherit system; };
         font-smc-manjari = pkgs.callPackage ./manjari/default.nix { };
-        font-smc-anjali-old-lipi = pkgs.callPackage ./anjali-old-lipi/default.nix { };
+        font-smc-anjali-old-lipi =
+          pkgs.callPackage ./anjali-old-lipi/default.nix { };
         font-smc-chilanka = pkgs.callPackage ./chilanka/default.nix { };
+        font-smc-gayathri = pkgs.callPackage ./gayathri/default.nix { };
       in rec {
         packages = {
           smc-anjali-old-lipi = font-smc-anjali-old-lipi;
           smc-manjari = font-smc-manjari;
           smc-chilanka = font-smc-chilanka;
+          smc-gayathri = font-smc-gayathri;
 
           all = pkgs.symlinkJoin {
             name = "all";
-            paths =
-              [ font-smc-anjali-old-lipi font-smc-chilanka font-smc-manjari ];
+            paths = [
+              font-smc-anjali-old-lipi
+              font-smc-chilanka
+              font-smc-manjari
+              font-smc-gayathri
+            ];
           };
           default = packages.all;
         };

gayathri/default.nix

@@ -0,0 +1,28 @@
+{ pkgs, ... }:
+
+pkgs.stdenv.mkDerivation {
+  version = "1.300 ";
+  pname = "gayathri";
+
+  src = pkgs.fetchzip {
+    url = "https://smc.org.in/downloads/fonts/gayathri/gayathri.zip";
+    hash = "sha256-p9KZi31Na4hfUuDsKj4OXjc9s6J/8xMeuszlL5oVauQ=";
+    stripRoot = false;
+  };
+
+  installPhase = ''
+    runHook preInstall
+
+    install -D -m444 -t $out/share/fonts/opentype $src/*.otf
+
+    runHook postInstall
+  '';
+
+  meta = with pkgs.lib; {
+    homepage = "https://smc.org.in/fonts/gayathri";
+    description = "Chilanka Malayalam Typeface";
+    license = licenses.ofl;
+    platforms = platforms.all;
+    maintainers = with maintainers; [ aashiks ];
+  };
+}