Add mem free printing (I need it to verify a suspicion relating to a bug)

node_modules/lv_font_conv/lib/convert.js

@@ -0,0 +1,30 @@
+// Internal API to convert input data into output font data
+// Used by both CLI and Web wrappers.
+'use strict';
+
+const collect_font_data = require('./collect_font_data');
+
+let writers = {
+  dump: require('./writers/dump'),
+  bin: require('./writers/bin'),
+  lvgl: require('./writers/lvgl')
+};
+
+
+//
+// Input:
+// - args like from CLI (optionally extended with binary content of files)
+//
+// Output:
+// - { name1: bin_data1, name2: bin_data2, ... }
+//
+// returns hash with files to write
+//
+module.exports = async function convert(args) {
+  let font_data = await collect_font_data(args);
+  let files = writers[args.format](args, font_data);
+
+  return files;
+};
+
+module.exports.formats = Object.keys(writers);