colorschemes/melange: init + test (#636)

* feat: add melange colorscheme support

* fix: colorschemes typo

Co-authored-by: Gaétan Lepage <33058747+GaetanLepage@users.noreply.github.com>

* refactor: omit redundant tests

Co-authored-by: Gaétan Lepage <33058747+GaetanLepage@users.noreply.github.com>

---------

Co-authored-by: Gaétan Lepage <33058747+GaetanLepage@users.noreply.github.com>

plugins/colorschemes/melange.nix

@@ -0,0 +1,25 @@
+{
+  pkgs,
+  lib,
+  config,
+  ...
+}: let
+  inherit (lib) mkEnableOption mkDefault mkIf;
+  inherit (import ../helpers.nix {inherit lib;}) mkPackageOption;
+  cfg = config.colorschemes.melange;
+in {
+  options = {
+    colorschemes.melange = {
+      enable = mkEnableOption "Melange colorscheme";
+      package = mkPackageOption "melange.nvim" pkgs.vimPlugins.melange-nvim;
+    };
+  };
+
+  config = mkIf cfg.enable {
+    colorscheme = "melange";
+    extraPlugins = [cfg.package];
+    options = {
+      termguicolors = mkDefault true;
+    };
+  };
+}

plugins/default.nix

@@ -10,6 +10,7 @@
     ./colorschemes/dracula.nix
     ./colorschemes/gruvbox.nix
     ./colorschemes/kanagawa.nix
+    ./colorschemes/melange.nix
     ./colorschemes/nord.nix
     ./colorschemes/one.nix
     ./colorschemes/onedark.nix

tests/test-sources/plugins/colorschemes/melange.nix

@@ -0,0 +1,5 @@
+{
+  empty = {
+    colorschemes.melange.enable = true;
+  };
+}