zellij: adds options to integrate with zsh, bash and fish shells (#3926)

* zellij: adds options to integrate with zsh, bash and fish shells

* zellij: add tests for shell integration options

* zellij: eval setup auto start for fish integration

* zellij: use interactiveShellInit for fish integration

* zellij: fixes format issues

* zellij: enable shell integrations by default

* zellij: compresses shell integration test cases

* zellij: removes the disabled shell integration tests

* zellij: formats tests

modules/programs/zellij.nix

@@ -39,6 +39,18 @@ in {
         list of options.
       '';
     };
+
+    enableBashIntegration = mkEnableOption "Enable Bash integration." // {
+      default = true;
+    };
+
+    enableZshIntegration = mkEnableOption "Enable Zsh integration." // {
+      default = true;
+    };
+
+    enableFishIntegration = mkEnableOption "Enable Fish integration." // {
+      default = true;
+    };
   };
 
   config = mkIf cfg.enable {
@@ -55,5 +67,18 @@ in {
       (cfg.settings != { } && (versionAtLeast cfg.package.version "0.32.0")) {
         text = lib.hm.generators.toKDL { } cfg.settings;
       };
+
+    programs.bash.initExtra = mkIf cfg.enableBashIntegration (mkOrder 200 ''
+      eval "$(zellij setup --generate-auto-start bash)"
+    '');
+
+    programs.zsh.initExtra = mkIf cfg.enableZshIntegration (mkOrder 200 ''
+      eval "$(zellij setup --generate-auto-start zsh)"
+    '');
+
+    programs.fish.interactiveShellInit = mkIf cfg.enableFishIntegration
+      (mkOrder 200 ''
+        eval (zellij setup --generate-auto-start fish | string collect)
+      '');
   };
 }

tests/default.nix

@@ -133,6 +133,7 @@ import nmt {
     ./modules/programs/vscode
     ./modules/programs/watson
     ./modules/programs/wezterm
+    ./modules/programs/zellij
     ./modules/programs/zplug
     ./modules/programs/zsh
     ./modules/xresources

tests/modules/programs/zellij/default.nix

@@ -0,0 +1 @@
+{ zellij-enable-shells = ./enable-shells.nix; }

tests/modules/programs/zellij/enable-shells.nix

@@ -0,0 +1,37 @@
+{ lib, ... }:
+
+{
+  programs = {
+    # All shell integratons are enabled by default.
+    zellij.enable = true;
+    bash.enable = true;
+    zsh.enable = true;
+    fish.enable = true;
+  };
+
+  # Needed to avoid error with dummy fish package.
+  xdg.dataFile."fish/home-manager_generated_completions".source =
+    lib.mkForce (builtins.toFile "empty" "");
+
+  test.stubs = {
+    zsh = { };
+    zellij = { };
+  };
+
+  nmt.script = ''
+    assertFileExists home-files/.bashrc
+    assertFileContains \
+      home-files/.bashrc \
+      'eval "$(zellij setup --generate-auto-start bash)"'
+
+    assertFileExists home-files/.zshrc
+    assertFileContains \
+      home-files/.zshrc \
+      'eval "$(zellij setup --generate-auto-start zsh)"'
+
+    assertFileExists home-files/.config/fish/config.fish
+    assertFileContains \
+      home-files/.config/fish/config.fish \
+      'eval (zellij setup --generate-auto-start fish | string collect)'
+  '';
+}