refactor: massively overhaul home manager module system

hm/modules/common/shellenv/fastfetch/config.json

@@ -0,0 +1,81 @@
+{
+  "$schema": "https://github.com/fastfetch-cli/fastfetch/raw/dev/doc/json_schema.json",
+  "display": {
+    "separator": " "
+  },
+  "modules": [
+    "break",
+    "break",
+    "break",
+    "break",
+    "break",
+    {
+      "type": "title",
+      "keyWidth": 10
+    },
+    "break",
+    {
+      "type": "os",
+      "key": " ",
+      "keyColor": "34",
+      "format": "{3} on {12}"
+    },
+    {
+      "type": "kernel",
+      "key": " ",
+      "keyColor": "34"
+    },
+    {
+      "type": "packages",
+      "key": " ",
+      "keyColor": "34"
+    },
+    {
+      "type": "shell",
+      "key": " ",
+      "keyColor": "34"
+    },
+    {
+      "type": "terminal",
+      "key": " ",
+      "keyColor": "34"
+    },
+    {
+      "type": "wm",
+      "key": " ",
+      "keyColor": "34"
+    },
+    {
+      "type": "CPU",
+      "key": " ",
+      "keyColor": "34"
+    },
+    {
+      "type": "GPU",
+      "key": "󰍹 ",
+      "keyColor": "34"
+    },
+    {
+      "type": "uptime",
+      "key": " ",
+      "keyColor": "34"
+    },
+    {
+      "type": "media",
+      "key": "󰝚 ",
+      "keyColor": "34"
+    },
+    {
+      "type": "player",
+      "key": " ",
+      "keyColor": "34"
+    },
+    "break",
+    {
+      "type": "custom",
+      "format": "\u001b[90m  \u001b[31m  \u001b[32m  \u001b[33m  \u001b[34m  \u001b[35m  \u001b[36m  \u001b[37m "
+    },
+    "break",
+    "break"
+  ]
+}

hm/modules/common/shellenv/fastfetch/default.nix

@@ -0,0 +1,39 @@
+{ config, lib, ... }:
+let
+  fastfetchConfig = builtins.fromJSON (builtins.readFile ./config.json);
+  cfg = config.liminalOS.shellEnv.fastfetch;
+in
+{
+  options.liminalOS.shellEnv.fastfetch = {
+    enable = lib.mkOption {
+      type = lib.types.bool;
+      default = config.liminalOS.shellEnv.enable;
+      description = ''
+        Whether to set up and configure fastfetch.
+      '';
+    };
+    useKittyImage = lib.mkOption {
+      type = lib.types.bool;
+      default = cfg.enable;
+      description = ''
+        Whether to use the kitty image protocol.
+      '';
+    };
+  };
+  config.programs.fastfetch = lib.mkIf cfg.enable {
+    enable = true;
+    settings = (
+      fastfetchConfig
+      // {
+        logo = {
+          height = 18;
+          padding = {
+            top = 2;
+          };
+          type = if cfg.useKittyImage then "kitty" else "auto";
+          source = lib.mkIf cfg.useKittyImage ./nixos-logo.png;
+        };
+      }
+    );
+  };
+}