flake.nix refactor

flake.nix

@@ -1,47 +1,46 @@
 { description = "niss's silly extra packages";
 
-  outputs = all@{ self, nixpkgs, ... }:
+  outputs = all@{ self, nixpkgs }:
   let
-    inherit (nixpkgs.lib) genAttrs optionalAttrs systems;
-
+    inherit (nixpkgs.lib) genAttrs optionalAttrs systems defaultTo;
     forAllSystems = genAttrs systems.flakeExposed;
-    getCallPackage = system: nixpkgs.legacyPackages.${system}.callPackage;
-    ifLinux64 = system: attrs: optionalAttrs (system == "x86_64-linux") attrs;
 
-    linuxPackageNames = [
-      "multi-ghc"
-      "basilisk" "isabelle"
+
+    packagesInDir = dir: names: pkgs:
+      let inherit (pkgs) callPackage; in
+      genAttrs names (pkg: callPackage ./${dir}/${pkg}.nix {});
+
+    linuxPackages = packagesInDir "apps" [
+      "multi-ghc" "basilisk" "isabelle"
       "firefox-esr-alias" "inkscape-xwayland"
     ];
-    fontNames = [
+
+    fonts = packagesInDir "fonts" [
       "constructium" "fairfax-hd" "kreative-square" "muller"
       "pragmatapro" "teranoptia"
     ];
 
-    linuxAppNames = [
-      "basilisk" "isabelle" "firefox-esr-alias" "inkscape-xwayland"
+
+    makeApp = name: exe:
+      { type = "app"; program = "${pkgs.${name}}/bin/${defaultTo name exe}"; };
+
+    linuxApps = pkgs: [
+      (makeApp "basilisk" null)
+      (makeApp "isabelle" null)
+      (makeApp "firefox-esr-alias" "firefox-esr")
+      (makeApp "inkscape-xwayland" "inkscape")
     ];
-    linuxAppExes = {
-      firefox-esr-alias = "firefox-esr";
-      inkscape-xwayland = "inkscape";
-    };
 
-    packagesInDir = names: dir: call:
-      genAttrs names (pkg: call ./${dir}/${pkg}.nix {});
 
-    linuxOnly = packagesInDir linuxPackageNames "apps";
-    fonts     = packagesInDir fontNames         "fonts";
-    all = system: call: ifLinux64 system (linuxOnly call) // fonts call;
+    ifLinux64 = f: pkgs: optionalAttrs (pkgs.system == "x86_64-linux") (f pkgs);
 
-    makeApp = pkgs: name: {
-      type    = "app";
-      program = "${pkgs.${name}}/bin/${linuxAppExes.${name} or name}";
-    };
+    mkPackages = pkgs:
+      ifLinux64 linuxPackages pkgs // fonts pkgs;
 
-    linuxApps = call: genAttrs linuxAppNames (makeApp (linuxOnly call));
+    mkApps = pkgs: ifLinux64 linuxApps pkgs;
   in {
-    packages = forAllSystems (s: all s (getCallPackage s));
-    apps     = forAllSystems (s: ifLinux64 s (linuxApps (getCallPackage s)));
-    overlays = forAllSystems (s: final: prev: all s final.callPackage);
+    packages = forAllSystems (sys: mkPackages nixpkgs.legacyPackages.${sys});
+    apps     = forAllSystems (sys: mkApps nixpkgs.legacyPackages.${sys});
+    overlays = forAllSystems (sys: final: prev: mkApps final);
   };
 }