From 24b734500f525c4bfe8797b6f25d5c4e0ff9cc18 Mon Sep 17 00:00:00 2001
From: Tadeo Kondrak <me@tadeo.ca>
Date: Sun, 12 May 2019 20:08:23 -0600
Subject: [PATCH] alacritty: don't create file if settings is empty

Also add a few test cases for the alacritty module.

(cherry picked from commit d2ed39f103edfaf3c711fee0f323558aaca7bd26)
---
 modules/programs/alacritty.nix                | 13 +++++---
 tests/default.nix                             |  1 +
 tests/modules/programs/alacritty/default.nix  |  4 +++
 .../programs/alacritty/empty-settings.nix     | 13 ++++++++
 .../alacritty/example-settings-expected.yml   |  1 +
 .../programs/alacritty/example-settings.nix   | 32 +++++++++++++++++++
 6 files changed, 59 insertions(+), 5 deletions(-)
 create mode 100644 tests/modules/programs/alacritty/default.nix
 create mode 100644 tests/modules/programs/alacritty/empty-settings.nix
 create mode 100644 tests/modules/programs/alacritty/example-settings-expected.yml
 create mode 100644 tests/modules/programs/alacritty/example-settings.nix

diff --git a/modules/programs/alacritty.nix b/modules/programs/alacritty.nix
index a4e5e605..84675cb1 100644
--- a/modules/programs/alacritty.nix
+++ b/modules/programs/alacritty.nix
@@ -41,10 +41,13 @@ in
     };
   };
 
-  config = mkIf cfg.enable {
-    home.packages = [ pkgs.alacritty ];
+  config = mkMerge [
+    (mkIf cfg.enable {
+      home.packages = [ pkgs.alacritty ];
 
-    xdg.configFile."alacritty/alacritty.yml".text =
-      replaceStrings ["\\\\"] ["\\"] (builtins.toJSON cfg.settings);
-  };
+      xdg.configFile."alacritty/alacritty.yml" = mkIf (cfg.settings != {}) {
+        text = replaceStrings ["\\\\"] ["\\"] (builtins.toJSON cfg.settings);
+      };
+    })
+  ];
 }
diff --git a/tests/default.nix b/tests/default.nix
index d186ee04..b9c77dd2 100644
--- a/tests/default.nix
+++ b/tests/default.nix
@@ -35,6 +35,7 @@ import nmt {
     // import ./modules/systemd
   )
   // import ./modules/home-environment
+  // import ./modules/programs/alacritty
   // import ./modules/programs/bash
   // import ./modules/programs/ssh
   // import ./modules/programs/tmux
diff --git a/tests/modules/programs/alacritty/default.nix b/tests/modules/programs/alacritty/default.nix
new file mode 100644
index 00000000..f63e033d
--- /dev/null
+++ b/tests/modules/programs/alacritty/default.nix
@@ -0,0 +1,4 @@
+{
+  alacritty-example-settings = ./example-settings.nix;
+  alacritty-empty-settings = ./empty-settings.nix;
+}
diff --git a/tests/modules/programs/alacritty/empty-settings.nix b/tests/modules/programs/alacritty/empty-settings.nix
new file mode 100644
index 00000000..f3f8486a
--- /dev/null
+++ b/tests/modules/programs/alacritty/empty-settings.nix
@@ -0,0 +1,13 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  config = {
+    programs.alacritty.enable = true;
+
+    nmt.script = ''
+      assertPathNotExists home-files/.config/alacritty
+    '';
+  };
+}
diff --git a/tests/modules/programs/alacritty/example-settings-expected.yml b/tests/modules/programs/alacritty/example-settings-expected.yml
new file mode 100644
index 00000000..06162419
--- /dev/null
+++ b/tests/modules/programs/alacritty/example-settings-expected.yml
@@ -0,0 +1 @@
+{"key_bindings":[{"chars":"\x0c","key":"K","mods":"Control"}],"window":{"dimensions":{"columns":200,"lines":3}}}
\ No newline at end of file
diff --git a/tests/modules/programs/alacritty/example-settings.nix b/tests/modules/programs/alacritty/example-settings.nix
new file mode 100644
index 00000000..2c84710d
--- /dev/null
+++ b/tests/modules/programs/alacritty/example-settings.nix
@@ -0,0 +1,32 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  config = {
+    programs.alacritty = {
+      enable = true;
+
+      settings = {
+        window.dimensions = {
+          lines = 3;
+          columns = 200;
+        };
+
+        key_bindings = [
+          {
+            key = "K";
+            mods = "Control";
+            chars = "\\x0c";
+          }
+        ];
+      };
+    };
+
+    nmt.script = ''
+      assertFileContent \
+        home-files/.config/alacritty/alacritty.yml \
+        ${./example-settings-expected.yml}
+    '';
+  };
+}