From c9559961b4077e20e9a9bdfbd897c230c8869f5b Mon Sep 17 00:00:00 2001
From: Gordon Williams <gw@pur3.co.uk>
Date: Thu, 8 Jul 2021 11:12:49 +0100
Subject: [PATCH] ability to package all files up into a binary blob

---
 bin/build_bangle2_c.js | 98 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100755 bin/build_bangle2_c.js

diff --git a/bin/build_bangle2_c.js b/bin/build_bangle2_c.js
new file mode 100755
index 000000000..5e086b980
--- /dev/null
+++ b/bin/build_bangle2_c.js
@@ -0,0 +1,98 @@
+#!/usr/bin/nodejs
+/*
+Mashes together a bunch of different apps into a big binary blob.
+We then store this *inside* the Bangle.js firmware and can use it
+to populate Storage initially.
+
+Bangle.js 1 doesn't really have anough flash space for this,
+but we have enough on v2.
+*/
+var SETTINGS = {
+  pretokenise : true
+};
+
+var path = require('path');
+var ROOTDIR = path.join(__dirname, '..');
+var APPDIR = ROOTDIR+'/apps';
+var APPJSON = ROOTDIR+'/apps.json';
+var OUTFILE = path.join(ROOTDIR, '../Espruino/libs/banglejs/banglejs2_storage_default.c');
+var APPS = [ // IDs of apps to install
+  "boot","launchb2","s7clk","setting",
+  "about","alarm","widlock","widbat","widbt"
+];
+var MINIFY = true;
+
+var fs = require("fs");
+global.Const = {
+  /* Are we only putting a single app on a device? If so
+  apps should all be saved as .bootcde and we write info
+  about the current app into app.info */
+  SINGLE_APP_ONLY : false,
+};
+
+var AppInfo = require(ROOTDIR+"/core/js/appinfo.js");
+var appjson = JSON.parse(fs.readFileSync(APPJSON).toString());
+var appfiles = [];
+
+function fileGetter(url) {
+  console.log("Loading "+url)
+  if (MINIFY) {
+    if (url.endsWith(".json")) {
+      var f = url.slice(0,-5);
+      console.log("MINIFYING JSON "+f);
+      var j = eval("("+fs.readFileSync(url).toString("binary")+")");
+      var code = JSON.stringify(j);
+      //console.log(code);
+      url = f+".min.json";
+      fs.writeFileSync(url, code);
+    }
+  }
+  return Promise.resolve(fs.readFileSync(url).toString("binary"));
+}
+
+Promise.all(APPS.map(appid => {
+  var app = appjson.find(app=>app.id==appid);
+  if (app===undefined) throw new Error(`App ${appid} not found`);
+  return AppInfo.getFiles(app, {
+    fileGetter : fileGetter,
+    settings : SETTINGS
+  }).then(files => {
+    appfiles = appfiles.concat(files);
+  });
+})).then(() => {
+  // work out what goes in storage
+  var storageContent = "";
+  appfiles.forEach((file) => {
+    var fileLength = file.content.length;
+    console.log(file.name+" -> "+fileLength+"b");
+    // set up header
+    var header = new Uint8Array(32);
+    header.fill(0);
+    header.set([fileLength,fileLength>>8,fileLength>>16,fileLength>>24],0); // length
+    for (var i=0;i<file.name.length;i++)
+      header[4+i] = file.name.charCodeAt(i);
+    // add header and file content
+    storageContent += String.fromCharCode.apply(String, header);
+    storageContent += file.content;
+    // pad length
+    while (fileLength&3) {
+      storageContent += "\xff";
+      fileLength++;
+    }
+  });
+  // work out file contents
+  var cfile = `// Initial storage contents for Bangle.js 2.0
+// Generated by BangleApps/bin/build_bangles_c.js
+
+const int jsfStorageInitialContentLength = ${storageContent.length};
+const char jsfStorageInitialContents[] = {
+`;
+for (var i=0;i<storageContent.length;i+=32) {
+  var chunk = storageContent.substr(i,32);
+  cfile += chunk.split("").map(c=>c.charCodeAt()).join(",")+",\n";
+}
+cfile += `};
+`;
+  fs.writeFileSync(OUTFILE, cfile);
+  console.log("Output written to "+OUTFILE);
+});