init: nix support (#1131)

* init(nix): initial nix support

* nix(compat): add flake-compat

* remove `macro expansion`

* remove `extraEntries` from `makeDesktopItem`

* fix Categories

* add darwin compatibilty

.envrc

@@ -0,0 +1 @@
+use_flake

.gitignore

@@ -2,5 +2,10 @@ target/
 *.new
 .vscode
 .vim
-.DS_Store 
+.DS_Store
 /assets/man/zellij.1
+
+# nix
+.direnv/
+.result/
+./result

default.nix

@@ -0,0 +1,13 @@
+(import
+  (
+    let
+      lock = builtins.fromJSON (builtins.readFile ./flake.lock);
+    in
+    fetchTarball {
+      url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+      sha256 = lock.nodes.flake-compat.locked.narHash;
+    }
+  )
+  {
+    src = ./.;
+  }).defaultNix

flake.nix

@@ -0,0 +1,132 @@
+{
+  description = "Zellij, a terminal workspace with batteries included";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+    flake-utils.inputs.nixpkgs.follows = "nixpkgs";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    rust-overlay.inputs.nixpkgs.follows = "nixpkgs";
+    rust-overlay.inputs.flake-utils.follows = "flake-utils";
+    flake-compat.url = "github:edolstra/flake-compat";
+    flake-compat.flake = false;
+  };
+
+  outputs = { self, rust-overlay, nixpkgs, flake-utils, flake-compat }:
+    flake-utils.lib.eachSystem [
+      "aarch64-linux"
+      "aarch64-darwin"
+      "i686-linux"
+      "x86_64-darwin"
+      "x86_64-linux"
+    ] (system:
+      let
+        overlays = [ (import rust-overlay) ];
+
+        pkgs = import nixpkgs { inherit system overlays; };
+
+        name = "zellij";
+        pname = name;
+        root = toString ./.;
+
+        ignoreSource = [ ".git" "target" ];
+
+        src = pkgs.nix-gitignore.gitignoreSource ignoreSource root;
+
+        rustToolchainToml =
+          pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain;
+        cargoLock = { lockFile = ./Cargo.lock; };
+        cargo = rustToolchainToml;
+        rustc = rustToolchainToml;
+
+        #env
+        RUST_BACKTRACE = 1;
+
+        buildInputs = [
+          rustToolchainToml
+
+          # in order to run tests
+          pkgs.openssl
+        ];
+
+        nativeBuildInputs = [
+          pkgs.installShellFiles
+          pkgs.copyDesktopItems
+
+          # for openssl/openssl-sys
+          pkgs.pkg-config
+        ] ++ pkgs.lib.optionals pkgs.stdenv.isDarwin [
+          pkgs.libiconv
+          pkgs.Foundation
+        ];
+
+        devInputs = [
+          pkgs.cargo-make
+          pkgs.rust-analyzer
+          pkgs.nixpkgs-fmt
+          # generates manpages
+          pkgs.mandown
+          # optimizes wasm binaries
+          pkgs.binaryen
+        ];
+
+      in rec {
+
+        packages.zellij =
+          (pkgs.makeRustPlatform { inherit cargo rustc; }).buildRustPackage {
+            inherit src name cargoLock buildInputs nativeBuildInputs;
+
+            preCheck = ''
+              HOME=$TMPDIR
+            '';
+
+            postInstall = ''
+
+              # explicit behavior
+              $out/bin/zellij setup --generate-completion bash > ./completions.bash
+              installShellCompletion --bash --name ${pname}.bash ./completions.bash
+              $out/bin/zellij setup --generate-completion fish > ./completions.fish
+              installShellCompletion --fish --name ${pname}.fish ./completions.fish
+              $out/bin/zellij setup --generate-completion zsh > ./completions.zsh
+              installShellCompletion --zsh --name _${pname} ./completions.zsh
+
+              install -Dm644  ./assets/logo.png $out/share/icons/hicolor/scalable/apps/zellij.png
+
+              copyDesktopItems
+            '';
+
+            desktopItems = [
+              (pkgs.makeDesktopItem {
+                type = "Application";
+                inherit name;
+                desktopName = "zellij";
+                terminal = true;
+                genericName = "Terminal multiplexer";
+                comment = "Manage your terminal applications";
+                exec = "zellij";
+                icon = "zellij";
+                categories = [ "ConsoleOnly;System" ];
+              })
+            ];
+
+            meta = with pkgs.lib; {
+              homepage = "https://github.com/zellij-org/zellij/";
+              description = "A terminal workspace with batteries included";
+              license = [ licenses.mit ];
+            };
+          };
+
+        defaultPackage = packages.zellij;
+
+        # nix run
+        apps.zellij = flake-utils.lib.mkApp { drv = packages.zellij; };
+        defaultApp = apps.zellij;
+
+        devShell = pkgs.mkShell {
+          name = "zellij-dev";
+          inherit buildInputs RUST_BACKTRACE;
+          nativeBuildInputs = nativeBuildInputs ++ devInputs;
+        };
+
+      });
+}

shell.nix

@@ -0,0 +1,13 @@
+(import
+  (
+    let
+      lock = builtins.fromJSON (builtins.readFile ./flake.lock);
+    in
+    fetchTarball {
+      url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+      sha256 = lock.nodes.flake-compat.locked.narHash;
+    }
+  )
+  {
+    src = ./.;
+  }).shellNix