Generate client version string from package.json version

Depends on this PR: webpro/versionify#2

index.js

@@ -17,13 +17,22 @@ var parallel = require('run-parallel')
 var parseTorrent = require('parse-torrent')
 var speedometer = require('speedometer')
 var stream = require('stream')
+var zeroFill = require('zero-fill')
 
 var FSStorage = require('./lib/fs-storage') // browser exclude
 var Storage = require('./lib/storage')
 var Torrent = require('./lib/torrent')
 
 inherits(WebTorrent, EventEmitter)
 
+/**
+ * BitTorrent client version string (used in peer ID).
+ * Generated from package.json major and minor version. For example:
+ *   '0.16.1' -> '0016'
+ *   '1.2.5' -> '0102'
+ */
+var VERSION = '__VERSION__'.match(/([0-9]+)/g).slice(0, 2).map(zeroFill(2)).join('')
+
 /**
  * WebTorrent Client
  * @param {Object} opts
@@ -49,7 +58,7 @@ function WebTorrent (opts) {
       : Storage
 
   self.peerId = opts.peerId === undefined
-    ? new Buffer('-WW0001-' + hat(48), 'utf8')
+    ? new Buffer('-WW' + VERSION + '-' + hat(48), 'utf8')
     : typeof opts.peerId === 'string'
       ? new Buffer(opts.peerId, 'utf8')
       : opts.peerId

package.json

@@ -21,6 +21,11 @@
     "load-ip-set": false,
     "ut_pex": false
   },
+  "browserify": {
+    "transform": [
+      "browserify-versionify"
+    ]
+  },
   "bugs": {
     "url": "https://github.com/feross/webtorrent/issues"
   },
@@ -64,24 +69,21 @@
     "ut_metadata": "^2.1.0",
     "ut_pex": "^1.0.1",
     "webtorrent-swarm": "^0.3.0",
-    "windows-no-runnable": "~0.0.6"
+    "windows-no-runnable": "~0.0.6",
+    "zero-fill": "^2.1.0"
   },
   "devDependencies": {
     "bittorrent-tracker": "^2.5.0",
     "brfs": "^1.2.0",
-    "browserify": "^6.1.0",
+    "browserify": "^7.0.0",
+    "browserify-versionify": "^1.0.2",
     "portfinder": "^0.2.1",
     "run-auto": "^1.0.0",
     "tape": "^3.0.3",
     "uglify-js": "^2.4.15",
     "zelda": "^2.0.0",
     "zuul": "^1.11.1"
   },
-  "optionalDependencies": {
-    "airplay-js": "^0.2.3",
-    "chromecast-js": "^0.1.4",
-    "nodebmc": "0.0.5"
-  },
   "homepage": "http://webtorrent.io",
   "keywords": [
     "torrent",
@@ -96,6 +98,11 @@
   ],
   "license": "MIT",
   "main": "index.js",
+  "optionalDependencies": {
+    "airplay-js": "^0.2.3",
+    "chromecast-js": "^0.1.4",
+    "nodebmc": "0.0.5"
+  },
   "repository": {
     "type": "git",
     "url": "git://github.com/feross/webtorrent.git"