atuin: add fish integration

modules/programs/atuin.nix

@@ -40,6 +40,16 @@ in {
       '';
     };
 
+    enableFishIntegration = mkOption {
+      default = true;
+      type = types.bool;
+      description = ''
+        Whether to enable Atuin's Fish integration.
+        </para><para>
+        If enabled, this will bind the up-arrow key to open the Atuin history.
+      '';
+    };
+
     settings = mkOption {
       type = with types;
         let
@@ -86,5 +96,9 @@ in {
     programs.zsh.initExtra = mkIf cfg.enableZshIntegration ''
       eval "$(${cfg.package}/bin/atuin init zsh)"
     '';
+
+    programs.fish.interactiveShellInit = mkIf cfg.enableFishIntegration ''
+      ${cfg.package}/bin/atuin init fish | source
+    '';
   };
 }

tests/modules/programs/atuin/default.nix

@@ -2,6 +2,7 @@
   atuin-bash = ./bash.nix;
   atuin-empty-settings = ./empty-settings.nix;
   atuin-example-settings = ./example-settings.nix;
+  atuin-fish = ./fish.nix;
   atuin-no-shell = ./no-shell.nix;
   atuin-zsh = ./zsh.nix;
 }

tests/modules/programs/atuin/fish.nix

@@ -0,0 +1,25 @@
+{ lib, ... }:
+
+{
+  programs = {
+    atuin.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 = {
+    atuin = { };
+    bash-preexec = { };
+    fish = { };
+  };
+
+  nmt.script = ''
+    assertFileExists home-files/.config/fish/config.fish
+    assertFileContains \
+      home-files/.config/fish/config.fish \
+      'atuin init fish | source'
+  '';
+}

tests/modules/programs/atuin/no-shell.nix

@@ -1,4 +1,4 @@
-{ ... }:
+{ lib, ... }:
 
 {
   programs = {
@@ -6,18 +6,26 @@
       enable = true;
       enableBashIntegration = false;
       enableZshIntegration = false;
+      enableFishIntegration = false;
     };
     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 = {
     atuin = { };
     bash-preexec = { };
+    fish = { };
   };
 
   nmt.script = ''
-    assertFileNotRegex home-files/.zshrc '@atuin@ init zsh'
-    assertFileNotRegex home-files/.bashrc '@atuin@ init bash'
+    assertFileNotRegex home-files/.zshrc 'atuin init zsh'
+    assertFileNotRegex home-files/.bashrc 'atuin init bash'
+    assertFileNotRegex home-files/.config/fish/config.fish 'atuin init fish'
   '';
 }