git-worktree-switcher: init module

modules/programs/git-worktree-switcher.nix

@@ -0,0 +1,52 @@
+{ pkgs, config, lib, ... }:
+
+let
+  inherit (lib) mkEnableOption mkOption mkPackageOption optionalString;
+
+  cfg = config.programs.git-worktree-switcher;
+
+  initScript = shell:
+    if (shell == "fish") then ''
+      ${lib.getExe pkgs.git-worktree-switcher} init ${shell} | source
+    '' else ''
+      eval "$(${lib.getExe pkgs.git-worktree-switcher} init ${shell})"
+    '';
+in {
+  meta.maintainers = with lib.maintainers; [ jiriks74 mateusauler ];
+
+  options.programs.git-worktree-switcher = {
+    enable = mkEnableOption "git-worktree-switcher";
+    package = mkPackageOption pkgs "git-worktree-switcher" { };
+    enableBashIntegration = mkOption {
+      type = lib.types.bool;
+      default = true;
+      description = ''
+        Whether to enable git-worktree-switcher's Bash integration.
+      '';
+    };
+    enableFishIntegration = mkOption {
+      type = lib.types.bool;
+      default = config.programs.fish.enable;
+      description = ''
+        Whether to enable git-worktree-switcher's Fish integration.
+      '';
+    };
+    enableZshIntegration = mkOption {
+      type = lib.types.bool;
+      default = config.programs.zsh.enable;
+      description = ''
+        Whether to enable git-worktree-switcher's Zsh integration.
+      '';
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    home.packages = [ cfg.package ];
+    programs.bash.initExtra =
+      optionalString cfg.enableBashIntegration (initScript "bash");
+    programs.fish.interactiveShellInit =
+      optionalString cfg.enableFishIntegration (initScript "fish");
+    programs.zsh.initExtra =
+      optionalString cfg.enableZshIntegration (initScript "zsh");
+  };
+}