chore: Add a first-party Nix flake

.github/workflows/ci.yml

@@ -33,6 +33,19 @@ jobs:
       - name: Run tests
         run: go test ./...
 
+  nix-build:
+    name: Nix Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v21
+
+      - name: Build flake package
+        run: nix build .
+
   coverage:
     name: Test and Coverage
     if: github.event_name == 'push' && github.ref == 'refs/heads/main'

README.md

@@ -30,6 +30,20 @@ ec (easy-conflict) is a 3-way terminal native Git merge conflict resolver. Suppo
 brew install chojs23/tap/ec
 ```
 
+### Nix
+
+Run without installing:
+
+```bash
+nix run github:chojs23/ec
+```
+
+Install into your profile:
+
+```bash
+nix profile add github:chojs23/ec
+```
+
 ### Install script
 
 You can run the installer through Make:

flake.nix

@@ -0,0 +1,93 @@
+{
+  description = "ec: terminal Git mergetool with a 3-way TUI";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+  outputs = { self, nixpkgs }:
+    let
+      lib = nixpkgs.lib;
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+      forAllSystems = lib.genAttrs systems;
+      tagRef =
+        if self ? ref then
+          self.ref
+        else if self ? sourceInfo && self.sourceInfo ? ref then
+          self.sourceInfo.ref
+        else
+          null;
+      versionDate =
+        if self ? lastModifiedDate then
+          builtins.substring 0 8 self.lastModifiedDate
+        else
+          null;
+      dirtyRevision =
+        if self ? dirtyShortRev then
+          lib.removeSuffix "-dirty" self.dirtyShortRev
+        else
+          null;
+      tagVersion =
+        if !builtins.isNull tagRef && lib.hasPrefix "refs/tags/" tagRef then
+          lib.removePrefix "refs/tags/" tagRef
+        else if !builtins.isNull tagRef && builtins.match "v[0-9].*" tagRef != null then
+          tagRef
+        else
+          null;
+      version =
+        if !builtins.isNull tagVersion then
+          tagVersion
+        else if self ? rev && self ? shortRev && !builtins.isNull versionDate then
+          "${versionDate}-${self.shortRev}"
+        else if !builtins.isNull dirtyRevision && !builtins.isNull versionDate then
+          "dirty-${versionDate}-${dirtyRevision}"
+        else if self ? shortRev && !builtins.isNull versionDate then
+          "${versionDate}-${self.shortRev}"
+        else if !builtins.isNull versionDate then
+          "dirty-${versionDate}"
+        else
+          "dirty";
+    in
+    {
+      packages = forAllSystems (
+        system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+        in
+        rec {
+          ec = pkgs.buildGoModule {
+            pname = "ec";
+            inherit version;
+            src = ./.;
+            vendorHash = "sha256-bV5y8zKculYULkFl9J95qebLOzdTT/LuYycqMmHKZ+g=";
+            subPackages = [ "cmd/ec" ];
+            ldflags = [
+              "-s"
+              "-w"
+              "-X main.version=${version}"
+            ];
+
+            meta = {
+              description = "Terminal-native 3-way git mergetool vim-like workflow";
+              homepage = "https://github.com/chojs23/ec";
+              license = pkgs.lib.licenses.mit;
+              mainProgram = "ec";
+              platforms = pkgs.lib.platforms.unix;
+            };
+          };
+
+          default = ec;
+        }
+      );
+
+      apps = forAllSystems (system: {
+        default = {
+          type = "app";
+          program = "${self.packages.${system}.default}/bin/ec";
+        };
+      });
+    };
+}