generate a style from a custom theme .ts file [#261]

styles/package.json

@@ -25,6 +25,7 @@
   ],
   "scripts": {
     "generate-styles": "tsx src/generate_styles.ts",
+    "generate-custom-style": "tsx src/generate_style.ts",
     "build": "tsup && npm run generate-styles https://example.com/tiles.json",
     "test": "tsx test/index.test.ts",
     "tsc-watch": "tsc --noEmit --watch",

styles/src/generate_style.ts

@@ -0,0 +1,31 @@
+// @ts-nocheck
+declare const process: unknown;
+
+import fs from "fs";
+import path from "path";
+import { writeFile } from "fs/promises";
+import { layersWithCustomTheme } from "./index";
+
+const args = process.argv.slice(2);
+const tileJson = args[0];
+const theme = await import(path.resolve(process.cwd(), args[1]));
+const lang = args[2];
+const output = args[3];
+
+const style = {
+  version: 8,
+  sources: {
+    protomaps: {
+      type: "vector",
+      attribution:
+        '<a href="https://github.com/protomaps/basemaps">Protomaps</a> © <a href="https://openstreetmap.org">OpenStreetMap</a>',
+      url: tileJson,
+    },
+  },
+  layers: layersWithCustomTheme("protomaps", themeObj, lang),
+  sprite: "https://protomaps.github.io/basemaps-assets/sprites/v3/light",
+  glyphs:
+    "https://protomaps.github.io/basemaps-assets/fonts/{fontstack}/{range}.pbf",
+};
+
+await writeFile(output, JSON.stringify(style, null, 2));