bring in some padDiff stuff that doesnt suck

src/node/db/API.js

@@ -568,6 +568,87 @@ exports.checkToken = function(callback)
 }
 
 
+/**
+createDiff(padID, startRev, endRev) returns an object of diffs from 2 points in a pad
+
+Example returns:
+
+TODO {"code":0,"message":"ok","data":null}
+TODO {"code":4,"message":"no or wrong API Key","data":null}
+*/
+exports.createDiff = function(padID, startRev, endRev, callback){
+  //check if rev is a number
+  if(startRev !== undefined && typeof startRev != "number")
+  {
+    //try to parse the number
+    if(!isNaN(parseInt(startRev)))
+    {
+      startRev = parseInt(startRev, 10);
+    }
+    else
+    {
+      callback({stop: "startRev is not a number"});
+      return;
+    }
+  }
+ 
+  //check if rev is a number
+  if(endRev !== undefined && typeof endRev != "number")
+  {
+    //try to parse the number
+    if(!isNaN(parseInt(endRev)))
+    {
+      endRev = parseInt(endRev, 10);
+    }
+    else
+    {
+      callback({stop: "endRev is not a number"});
+      return;
+    }
+  }
+ 
+  //get the pad
+  getPadSafe(padID, true, function(err, pad)
+  {
+    if(err){
+      return callback(err);
+    }
+ 
+    try {
+      var padDiff = new PadDiff(pad, startRev, endRev);
+    } catch(e) {
+      return callback({stop:e.message});
+    }
+ 
+    var html, authors;
+ 
+    async.series([
+      function(callback){
+        padDiff.getHtml(function(err, _html){
+          if(err){
+            return callback(err);
+          }
+ 
+          html = _html;
+          callback();
+        });
+      },
+      function(callback){
+        padDiff.getAuthors(function(err, _authors){
+          if(err){
+            return callback(err);
+          }
+ 
+          authors = _authors;
+          callback();
+        });
+      }
+    ], function(err){
+      callback(err, {html: html, authors: authors})
+    });
+  });
+}
+
 /******************************/
 /** INTERNAL HELPER FUNCTIONS */
 /******************************/