thefuck: add instant mode option

Also do a slight code cleanup.

modules/programs/thefuck.nix

@@ -1,7 +1,8 @@
 { config, lib, pkgs, ... }:
+
 with lib;
-let cfg = config.programs.thefuck;
-in {
+
+{
   meta.maintainers = [ hm.maintainers.ilaumjd ];
 
   options.programs.thefuck = {
@@ -10,6 +11,8 @@ in {
 
     package = mkPackageOption pkgs "thefuck" { };
 
+    enableInstantMode = mkEnableOption "thefuck's experimental instant mode";
+
     enableBashIntegration = mkOption {
       default = true;
       type = types.bool;
@@ -27,15 +30,22 @@ in {
     };
   };
 
-  config = mkIf cfg.enable {
+  config = let
+    cfg = config.programs.thefuck;
+
+    cliArgs = cli.toGNUCommandLineShell { } {
+      alias = true;
+      enable-experimental-instant-mode = cfg.enableInstantMode;
+    };
+
+    shEvalCmd = ''
+      eval "$(${cfg.package}/bin/thefuck ${cliArgs})"
+    '';
+  in mkIf cfg.enable {
     home.packages = [ cfg.package ];
 
-    programs.bash.initExtra = mkIf cfg.enableBashIntegration ''
-      eval "$(${cfg.package}/bin/thefuck --alias)"
-    '';
+    programs.bash.initExtra = mkIf cfg.enableBashIntegration shEvalCmd;
 
-    programs.zsh.initExtra = mkIf cfg.enableZshIntegration ''
-      eval "$(${cfg.package}/bin/thefuck --alias)"
-    '';
+    programs.zsh.initExtra = mkIf cfg.enableZshIntegration shEvalCmd;
   };
 }

tests/modules/programs/thefuck/default.nix

@@ -1,4 +1,5 @@
 {
   thefuck-integration-enabled = ./integration-enabled.nix;
+  thefuck-integration-enabled-instant = ./integration-enabled-instant.nix;
   thefuck-integration-disabled = ./integration-disabled.nix;
 }

tests/modules/programs/thefuck/integration-enabled-instant.nix

@@ -0,0 +1,26 @@
+{ ... }:
+
+{
+  programs = {
+    thefuck = {
+      enable = true;
+      enableInstantMode = true;
+    };
+    bash.enable = true;
+    zsh.enable = true;
+  };
+
+  test.stubs.thefuck = { };
+
+  nmt.script = ''
+    assertFileExists home-files/.bashrc
+    assertFileContains \
+      home-files/.bashrc \
+      'eval "$(@thefuck@/bin/thefuck '"'"'--alias'"'"' '"'"'--enable-experimental-instant-mode'"'"')"'
+
+    assertFileExists home-files/.zshrc
+    assertFileContains \
+      home-files/.zshrc \
+      'eval "$(@thefuck@/bin/thefuck '"'"'--alias'"'"' '"'"'--enable-experimental-instant-mode'"'"')"'
+  '';
+}

tests/modules/programs/thefuck/integration-enabled.nix

@@ -13,11 +13,11 @@
     assertFileExists home-files/.bashrc
     assertFileContains \
       home-files/.bashrc \
-      'eval "$(@thefuck@/bin/thefuck --alias)"'
+      'eval "$(@thefuck@/bin/thefuck '"'"'--alias'"'"')"'
 
     assertFileExists home-files/.zshrc
     assertFileContains \
       home-files/.zshrc \
-      'eval "$(@thefuck@/bin/thefuck --alias)"'
+      'eval "$(@thefuck@/bin/thefuck '"'"'--alias'"'"')"'
   '';
 }