Lots of fixes.

lib/main.js

@@ -19,6 +19,7 @@
  *   Jeffrey Wilcke <jeff@ethdev.com>
  *   Marek Kotewicz <marek@ethdev.com>
  *   Marian Oancea <marian@ethdev.com>
+ *   Gav Wood <g@ethdev.com>
  * @date 2014
  */
 
@@ -61,17 +62,23 @@ function flattenPromise (obj) {
     return Promise.resolve(obj);
 }
 
+var web3Methods = function () {
+    return [
+    { name: 'sha3', call: 'web3_sha3' }
+    ];
+};
+
 var ethMethods = function () {
     var blockCall = function (args) {
         return typeof args[0] === "string" ? "eth_blockByHash" : "eth_blockByNumber";
     };
 
     var transactionCall = function (args) {
-        return typeof args[0] === "string" ? 'eth_transactionByHash' : 'eth_transactionByNumber';   
+        return typeof args[0] === "string" ? 'eth_transactionByHash' : 'eth_transactionByNumber';
     };
 
     var uncleCall = function (args) {
-        return typeof args[0] === "string" ? 'eth_uncleByHash' : 'eth_uncleByNumber';       
+        return typeof args[0] === "string" ? 'eth_uncleByHash' : 'eth_uncleByNumber';
     };
 
     var methods = [
@@ -205,19 +212,20 @@ var setupProperties = function (obj, properties) {
     });
 };
 
+// TODO: import from a dependency, don't duplicate.
+var hexToDec = function (hex) {
+    return parseInt(hex, 16).toString();
+};
+
+var decToHex = function (dec) {
+    return parseInt(dec).toString(16);
+};
+
+
 var web3 = {
     _callbacks: {},
     _events: {},
     providers: {},
-    toHex: function(str) {
-        var hex = "";
-        for(var i = 0; i < str.length; i++) {
-            var n = str.charCodeAt(i).toString(16);
-            hex += n.length < 2 ? '0' + n : n;
-        }
-
-        return hex;
-    },
 
     toAscii: function(hex) {
         // Find termination
@@ -237,10 +245,6 @@ var web3 = {
         return str;
     },
 
-    toDecimal: function (val) {
-        return parseInt(val, 16);
-    },
-
     fromAscii: function(str, pad) {
         pad = pad === undefined ? 32 : pad;
         var hex = this.toHex(str);
@@ -249,6 +253,33 @@ var web3 = {
         return "0x" + hex;
     },
 
+    toDecimal: function (val) {
+        return hexToDec(val.substring(2));
+    },
+
+    fromDecimal: function (val) {
+        return "0x" + decToHex(val);
+    },
+
+    toEth: function(str) {
+        var val = typeof str === "string" ? str.indexOf('0x') == 0 ? parseInt(str.substr(2), 16) : parseInt(str) : str;
+        var unit = 0;
+        var units = [ 'wei', 'Kwei', 'Mwei', 'Gwei', 'szabo', 'finney', 'ether', 'grand', 'Mether', 'Gether', 'Tether', 'Pether', 'Eether', 'Zether', 'Yether', 'Nether', 'Dether', 'Vether', 'Uether' ];
+        while (val > 3000 && unit < units.length - 1)
+        {
+            val /= 1000;
+            unit++;
+        }
+        var s = val.toString().length < val.toFixed(2).length ? val.toString() : val.toFixed(2);
+        while (true) {
+            var o = s;
+            s = s.replace(/(\d)(\d\d\d[\.\,])/, function($0, $1, $2) { return $1 + ',' + $2; });
+            if (o == s)
+                break;
+        }
+        return s + ' ' + units[unit];
+    },
+
     eth: {
         prototype: Object(), // jshint ignore:line
         watch: function (params) {
@@ -294,6 +325,7 @@ var web3 = {
     }
 };
 
+setupMethods(web3, web3Methods());
 setupMethods(web3.eth, ethMethods());
 setupProperties(web3.eth, ethProperties());
 setupMethods(web3.db, dbMethods());
@@ -460,4 +492,3 @@ function messageHandler(data) {
 }
 
 module.exports = web3;
-