add apps to support the nix run command (#46)

flake.nix

@@ -7,50 +7,51 @@
   outputs = {self, nixpkgs, flake-utils}: flake-utils.lib.eachDefaultSystem (system:
     let
       pkgs = import nixpkgs { inherit system; };
+      yaMusic = pkgs.stdenv.mkDerivation {
+        name = "yandex-download-music";
+        version = "v1.5";
+        src = ./.;
+  
+        nativeBuildInputs = [
+          pkgs.makeWrapper
+        ];
+  
+        buildInputs = [
+          pkgs.perl
+          (pkgs.buildEnv {
+            name = "rt-perl-deps";
+            paths = with pkgs.perlPackages; (requiredPerlModules [
+                FileUtil
+                MP3Tag
+                GetoptLongDescriptive LWPUserAgent
+                LWPProtocolHttps
+                HTTPCookies
+                MozillaCA
+            ]);
+          })
+        ];
+  
+        installPhase = ''
+          mkdir -p $out/bin
+          cp src/ya.pl $out/bin/ya-music
+          # cat src/ya.pl | perl -p -e "s/basename\(__FILE__\)/'ya-music'/g" > $out/bin/ya-music
+          # chmod +x $out/bin/ya-music
+        '';
+  
+        postFixup = ''
+          # wrapProgram will rename ya-music into .ya-music-wrapped
+          # so replace all __FILE__ calls
+          substituteInPlace $out/bin/ya-music \
+            --replace "basename(__FILE__)" "'ya-music'"
+  
+          wrapProgram $out/bin/ya-music \
+            --prefix PERL5LIB : $PERL5LIB
+        '';
+      };
     in
-  {
-    packages.default = pkgs.stdenv.mkDerivation
     {
-      name = "yandex-download-music";
-      version = "v1.5";
-      src = ./.;
-
-      nativeBuildInputs = [
-        pkgs.makeWrapper
-      ];
-
-      buildInputs = [
-        pkgs.perl
-        (pkgs.buildEnv {
-          name = "rt-perl-deps";
-          paths = with pkgs.perlPackages; (requiredPerlModules [
-              FileUtil
-              MP3Tag
-              GetoptLongDescriptive LWPUserAgent
-              LWPProtocolHttps
-              HTTPCookies
-              MozillaCA
-          ]);
-        })
-      ];
-
-      installPhase = ''
-        mkdir -p $out/bin
-        cp src/ya.pl $out/bin/ya-music
-        # cat src/ya.pl | perl -p -e "s/basename\(__FILE__\)/'ya-music'/g" > $out/bin/ya-music
-        # chmod +x $out/bin/ya-music
-      '';
-
-      postFixup = ''
-        # wrapProgram will rename ya-music into .ya-music-wrapped
-        # so replace all __FILE__ calls
-        substituteInPlace $out/bin/ya-music \
-          --replace "basename(__FILE__)" "'ya-music'"
-
-        wrapProgram $out/bin/ya-music \
-          --prefix PERL5LIB : $PERL5LIB
-      '';
-    };
-  });
-
+      packages.default = yaMusic;
+      apps.default = flake-utils.lib.mkApp { drv = yaMusic; };
+    }
+  );
 }