flake.nix

@@ -4,47 +4,68 @@
   # Nixpkgs / NixOS version to use.
   inputs.nixpkgs.url = "nixpkgs/nixos-unstable";
 
-  outputs = {
+  outputs = { self, nixpkgs }:
-    self,
+    let
-    nixpkgs,
-  }: let
-    # to work with older version of flakes
-    lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
 
-    # Generate a user-friendly version number.
+      # to work with older version of flakes
-    version = builtins.substring 0 8 lastModifiedDate;
+      lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
 
-    # System types to support.
+      # Generate a user-friendly version number.
-    supportedSystems = ["x86_64-linux" "aarch64-linux"];
+      version = builtins.substring 0 8 lastModifiedDate;
 
-    # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+      # System types to support.
-    forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+      supportedSystems = [ "x86_64-linux" "aarch64-linux" ];
 
-    # Nixpkgs instantiated for supported system types.
+      # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
-    nixpkgsFor = forAllSystems (system: import nixpkgs {inherit system;});
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
-  in {
-    # Provide some binary packages for selected system types.
-    packages = forAllSystems (system: let
-      pkgs = nixpkgsFor.${system};
-    in {
-      swaysw = pkgs.buildGoModule {
-        pname = "swaysw";
-        inherit version;
-        src = ./.;
-        ldFlags = ["-s -w"];
-        vendorSha256 = null;
 
-      };
+      # Nixpkgs instantiated for supported system types.
-    });
+      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
 
-    devShells = forAllSystems (system: let
+    in
-      pkgs = nixpkgsFor.${system};
+    {
-    in {
-      default = pkgs.mkShell {
-        buildInputs = with pkgs; [go gopls gotools go-tools wofi];
-      };
-    });
 
-    defaultPackage = forAllSystems (system: self.packages.${system}.swaysw);
+      # Provide some binary packages for selected system types.
-  };
+      packages = forAllSystems (system:
+        let
+          pkgs = nixpkgsFor.${system};
+        in
+        {
+          swaysw = pkgs.buildGoModule {
+            pname = "swaysw";
+            inherit version;
+            # In 'nix develop', we don't need a copy of the source tree
+            # in the Nix store.
+            src = ./.;
+
+            # This hash locks the dependencies of this package. It is
+            # necessary because of how Go requires network access to resolve
+            # VCS.  See https://www.tweag.io/blog/2021-03-04-gomod2nix/ for
+            # details. Normally one can build with a fake sha256 and rely on native Go
+            # mechanisms to tell you what the hash should be or determine what
+            # it should be "out-of-band" with other tooling (eg. gomod2nix).
+            # To begin with it is recommended to set this, but one must
+            # remeber to bump this hash when your dependencies change.
+            vendorSha256 = null;
+
+            #vendorSha256 = "sha256-pQpattmS9VmO3ZIQUFn66az8GSmB4IvYhTTCFn6SUmo=";
+          };
+        });
+      
+      # Add dependencies that are only needed for development
+      devShells = forAllSystems (system:
+        let 
+          pkgs = nixpkgsFor.${system};
+        in
+        {
+          default = pkgs.mkShell {
+            buildInputs = with pkgs; [ go gopls gotools go-tools wofi ];
+          };
+        });
+
+      # The default package for 'nix build'. This makes sense if the
+      # flake provides only one package or there is a clear "main"
+      # package.
+      defaultPackage = forAllSystems (system: self.packages.${system}.swaysw);
+    };
 }

main.go

@@ -44,7 +44,7 @@ func selectWithWofi(windows string) string {
 	cmd.Stdin = strings.NewReader(windows)
 	stdout, err := cmd.Output()
 	if err != nil {
-		return ""
+		log.Fatal(err)
 	}
 	return strings.TrimSpace(string(stdout))
 }
@@ -82,8 +82,7 @@ func main() {
 	var windows []window
 	flatten(swaymsg_output, &windows)
 
-	if selected := selectWithWofi(getWindowNames(windows)); selected != "" {
+	selected := selectWithWofi(getWindowNames(windows))
-		windowId := findWindowId(selected, windows)
+	windowId := findWindowId(selected, windows)
-		switchToWindow(windowId)
+	switchToWindow(windowId)
-	}
 }