Add version and update commands

bot.js

@@ -1,5 +1,6 @@
 var irc = require("irc");
 var channels = require("./channels");
+var updater = require("./updater");
 
 var mode = 'irc';
 if (process.argv.length > 2)
@@ -29,6 +30,12 @@ var client = new irc.Client("irc.mozilla.org", kNick, {
   port: 6697
 });
 
+updater.restart = function () {
+  client.disconnect("Updating...hopefully don't need metaafrosdwilsh");
+  require("child_process").spawn('node', [__filename], { customFds: [0, 1, 2] });
+  process.exit();
+};
+
 client.on("invite", function (channel, from) {
   if (kAuthorizedUsers.indexOf(from) !== -1) {
     // TODO: solve race condition here

channels.js

@@ -7,6 +7,7 @@ var randompicker = require("./randompicker");
 var committers = require("./committers");
 var textutils = require("./textutils");
 var TemporalCache = require("./temporalcache");
+var updater = require("./updater");
 
 var kIssueTrackerUrl = 'https://github.com/sdwilsh/tree-bot/issues/new';
 var treeNames = require('./jsondb')('treenames.json').db;
@@ -218,6 +219,12 @@ ChannelController.prototype = {
   help: function (from) {
     this.channel.tell(from)("See https://github.com/sdwilsh/tree-bot/blob/master/README for a list of commands");
   },
+  version: function (from) {
+    this.channel.tell(from)(updater.version);
+  },
+  update: function (from) {
+    updater.update(this.channel.tell(from));
+  },
   handleCommand: function (from, text) {
     var self = this;
     function tryCommand(matcher, cb) {
@@ -235,6 +242,8 @@ ChannelController.prototype = {
     tryCommand(/^watch ([A-Fa-f0-9]{12}) on ([A-Za-z-]+)(?: for (.+))?/, this.watchTree);
     tryCommand(/^unwatch ([A-Fa-f0-9]{12}) on ([A-Za-z-]+)(?: for (.+))?/, this.unwatchTree);
     tryCommand(/^h[ae]lp/, this.help);
+    tryCommand(/^version$/, this.version);
+    tryCommand(/^update/, this.update);
   }
 };
 

updater.js

@@ -0,0 +1,33 @@
+var exec = require('child_process').exec;
+
+var version;
+var restart;
+
+exec('git rev-parse HEAD', function (error, stdout, stderr) {
+  if (error !== null) {
+    console.log("Got error trying to grab current version");
+  } else {
+    version = stdout;
+  }
+});
+
+exports.__defineGetter__('version', function () { return version; });
+exports.__defineGetter__('restart', function () { return restart; });
+exports.__defineSetter__('restart', function (r) { restart = r; });
+exports.update = function update(cb) {
+  exec('git pull --rebase origin master', function (error, stdout, stderr) {
+    if (error !== null) {
+      return cb("Had trouble fetching a new version: {0}", stderr);
+    }
+    exec('git rev-parse origin/master', function (error, new_version, stderr) {
+      if (error !== null) {
+        return cb("Had trouble parsing fetched version: {0}", stderr);
+      }
+      if (new_version === version) {
+        return cb("Looks like I'm up to date!");
+      }
+      cb("Updating to {0}. See you soon I hope!", new_version);
+      restart();
+    });
+  });
+};