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modules/home/utilities/fish.nix

@@ -0,0 +1,57 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
+
+with lib;
+let
+  cfg = config.modules.fish;
+in
+{
+  options.modules.fish = {
+    enable = mkEnableOption "fish";
+  };
+
+  config = mkIf cfg.enable {
+    # Make bash load into fish
+    # Bash will remain the default shell as fish is not POSIX compliant.
+    modules.bash.enable = true;
+    programs.bash.initExtra = ''
+      if [[ $(${pkgs.procps}/bin/ps --no-header --pid=$PPID --format=comm) != "fish" && -z ''${BASH_EXECUTION_STRING} ]]
+      then
+        shopt -q login_shell && LOGIN_OPTION='--login' || LOGIN_OPTION=""
+        exec ${pkgs.fish}/bin/fish $LOGIN_OPTION
+      fi
+    '';
+
+    # Actual fish configuration
+    programs.fish = {
+      enable = true;
+
+      shellAliases = config.modules.bash.aliases;
+
+      plugins = [
+        {
+          name = "done";
+          src = pkgs.fishPlugins.done.src;
+        }
+        {
+          name = "fzf";
+          src = pkgs.fishPlugins.fzf-fish.src;
+        }
+        {
+          name = "grc";
+          src = pkgs.fishPlugins.grc.src;
+        }
+      ];
+    };
+
+    # Fish plugin dependencies
+    home.packages = with pkgs; [
+      fzf
+      grc
+    ];
+  };
+}