add ranger configuration

home/modules/ranger.nix

@@ -9,15 +9,15 @@ in {
 
   options.modules.ranger = {
     enable = mkEnableOpt "Ranger";
+    preview = mkBoolOpt false "Enable Ranger image preview";
   };
 
   # TODO: Ranger configuration
 
   config = mkIf cfg.enable {
-    home.packages = with pkgs; [
+    home.packages = with pkgs; lib.concatLists [
+      [
         ranger
-      ueberzug
-      ffmpegthumbnailer
         atool
         p7zip
         zip
@@ -26,6 +26,46 @@ in {
         libarchive
         exiftool
         mediainfo
+      ]
+      (optionals cfg.preview [
+        # ueberzug # Only X11
+        python310Packages.pillow
+        ffmpegthumbnailer
+        imagemagick
+        poppler_utils
+      ])
+    ];
+
+    home.file = mkMerge [
+      {
+        ".config/ranger/rc.conf".text = let
+          # TODO: Why does mkMerge don't work here?
+          settings = {
+            column_ratios = "1,1";
+            vcs_aware = "true";
+            preview_images_method = "kitty"; # TODO: Only if kitty enabled
+            unicode_ellipsis = "true";
+            draw_borders = "outline"; # separators/outline/both/none
+            line_numbers = "relative";
+            preview_images = (if cfg.preview then "true" else "false");
+            use_preview_script = (if cfg.preview then "true" else "false");
+          } // (optionalAttrs cfg.preview {
+            preview_script = "${config.home.homeDirectory}/.config/ranger/scope.sh";
+          });
+
+          # The settings { column_ratios = "1,1"; } get turned into { column_ratios = "set column_ratios = 1,1"; }
+          settings_in_values = mapAttrs (name: value: concatStringsSep " " ["set" name value]) settings;
+
+          # Results in [ "set column_rations = 1,1" ]
+          settings_list = attrValues settings_in_values;
+
+          settings_str = concatStringsSep "\n" settings_list;
+        in settings_str;
+      }
+
+      (optionalAttrs cfg.preview {
+        ".config/ranger/scope.sh".source = mkIf cfg.preview ../../config/ranger/scope.sh;
+      })
     ];
   };
 }