plugins/poimandres: add colorscheme + test

plugins/colorschemes/poimandres.nix

@@ -0,0 +1,63 @@
+{
+  pkgs,
+  config,
+  lib,
+  ...
+} @ args:
+with lib; let
+  cfg = config.colorschemes.poimandres;
+  helpers = import ../helpers.nix args;
+in {
+  options = {
+    colorschemes.poimandres =
+      helpers.extraOptionsOptions
+      // {
+        enable = mkEnableOption "poimandres";
+
+        package = helpers.mkPackageOption "poimandres" pkgs.vimPlugins.poimandres-nvim;
+
+        boldVertSplit = helpers.defaultNullOpts.mkBool false "bold vertical split";
+
+        darkVariant = helpers.defaultNullOpts.mkStr "main" "dark variant";
+
+        disableBackground = helpers.defaultNullOpts.mkBool false "Whether to disable the background.";
+
+        disableFloatBackground =
+          helpers.defaultNullOpts.mkBool false
+          "Whether to disable the float background.";
+
+        disableItalics = helpers.defaultNullOpts.mkBool false "Whether to disable italics.";
+
+        dimNcBackground = helpers.defaultNullOpts.mkBool false "Dim NC background";
+
+        groups =
+          helpers.mkNullOrOption (with types; attrsOf (either str (attrsOf str)))
+          "groups";
+
+        highlightGroups = helpers.mkNullOrOption types.attrs "highlight groups";
+      };
+  };
+  config = let
+    setupOptions =
+      {
+        bold_vert_split = cfg.boldVertSplit;
+        dark_variant = cfg.darkVariant;
+        disable_background = cfg.disableBackground;
+        disable_float_background = cfg.disableFloatBackground;
+        disable_italics = cfg.disableItalics;
+        dim_nc_background = cfg.dimNcBackground;
+        inherit (cfg) groups;
+        highlight_groups = cfg.highlightGroups;
+      }
+      // cfg.extraOptions;
+  in
+    mkIf cfg.enable {
+      colorscheme = "poimandres";
+
+      extraPlugins = [cfg.package];
+
+      extraConfigLuaPre = ''
+        require("poimandres").setup(${helpers.toLuaObject setupOptions})
+      '';
+    };
+}

plugins/default.nix

@@ -8,6 +8,7 @@
     ./colorschemes/nord.nix
     ./colorschemes/one.nix
     ./colorschemes/onedark.nix
+    ./colorschemes/poimandres.nix
     ./colorschemes/tokyonight.nix
 
     ./completion/coq.nix