feat: color previews via nvim-colorizer-lua

modules/ui/colorizer/colorizer.nix

@@ -0,0 +1,67 @@
+{
+  config,
+  lib,
+  ...
+}:
+with lib;
+with builtins; {
+  options.vim.ui.colorizer = {
+    enable = mkEnableOption "Enable nvim-colorizer.lua for color highlighting";
+
+    options = {
+      rgb = mkOption {
+        type = types.bool;
+        default = true;
+        description = "#RGB hex codes";
+      };
+
+      rrggbb = mkOption {
+        type = types.bool;
+        default = true;
+        description = "#RRGGBB hex codes";
+      };
+
+      names = mkOption {
+        type = types.bool;
+        default = true;
+        description = ''"Name" codes such as "Blue"'';
+      };
+
+      rgb_fn = mkOption {
+        type = types.bool;
+        default = false;
+        description = "CSS rgb() and rgba() functions";
+      };
+
+      rrggbbaa = mkOption {
+        type = types.bool;
+        default = false;
+        description = "#RRGGBBAA hex codes";
+      };
+
+      hsl_fn = mkOption {
+        type = types.bool;
+        default = false;
+        description = "CSS hsl() and hsla() functions";
+      };
+
+      css = mkOption {
+        type = types.bool;
+        default = true;
+        description = "Enable all CSS features: rgb_fn, hsl_fn, names, RGB, RRGGBB";
+      };
+
+      css_fn = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Enable all CSS *functions*: rgb_fn, hsl_fn";
+      };
+
+      mode = mkOption {
+        type = types.enum ["foreground" "background"];
+        default = "background";
+        description = "Set the display mode";
+      };
+    };
+  };
+}

modules/ui/colorizer/config.nix

@@ -0,0 +1,32 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+}:
+with lib;
+with builtins; let
+  cfg = config.vim.ui.colorizer;
+in {
+  config = mkIf cfg.enable {
+    vim.startPlugins = [
+      "nvim-colorizer-lua"
+    ];
+
+    vim.luaConfigRC.colorizer = nvim.dag.entryAnywhere ''
+      require('colorizer').setup({
+         DEFAULT_OPTIONS = {
+           RGB      = ${boolToString cfg.options.rgb};
+           RRGGBB   = ${boolToString cfg.options.rrggbb};
+           names    = ${boolToString cfg.options.names};
+           RRGGBBAA = ${boolToString cfg.options.rrggbbaa};
+           rgb_fn   = ${boolToString cfg.options.rgb_fn};
+           hsl_fn   = ${boolToString cfg.options.hsl_fn};
+           css      = ${boolToString cfg.options.css};
+           css_fn   = ${boolToString cfg.options.css_fn};
+           mode     = '${toString cfg.options.mode}';
+        }
+      })
+    '';
+  };
+}

modules/ui/colorizer/default.nix

@@ -0,0 +1,6 @@
+_: {
+  imports = [
+    ./colorizer.nix
+    ./config.nix
+  ];
+}