Added support for document export, no link from the pad so far

node/Abiword.js

@@ -0,0 +1,93 @@
+/**
+ * Controls the communication with the Abiword application
+ */
+
+/*
+ * 2011 Peter 'Pita' Martischka
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS-IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+var util  = require('util');
+var spawn = require('child_process').spawn;
+var async = require("async");
+var settings = require("./settings");
+
+//Queue with the converts we have to do
+var queue = async.queue(doConvertTask, 1);
+
+//spawn the abiword process
+var abiword = spawn(settings.abiword, ["--plugin", "AbiCommand"]);
+
+//output error messages to stderr
+abiword.stderr.on('data', function (data) 
+{
+  console.error("Abiword: " + data);
+});
+
+//throw exceptions if abiword is dieing
+abiword.on('exit', function (code) 
+{
+  throw "Abiword died with exit code " + code;
+});
+
+//delegate the processing of stdout to a other function
+abiword.stdout.on('data',onAbiwordStdout);
+
+var stdoutCallback = null;
+var stdoutBuffer = "";
+var firstPrompt = true;
+
+function onAbiwordStdout(data)
+{
+  //add data to buffer
+  stdoutBuffer+=data.toString();
+  
+  //we're searching for the prompt, cause this means everything we need is in the buffer
+  if(stdoutBuffer.search("AbiWord:>") != -1)
+  {
+    //filter the feedback message
+    var lines = stdoutBuffer.split("\n");
+    var err = lines [1] == "OK" ? null : lines[1];
+    
+    //reset the buffer
+    stdoutBuffer = "";
+    
+    //call the callback with the error message
+    //skip the first prompt
+    if(stdoutCallback != null && !firstPrompt)
+    {
+      stdoutCallback(err);
+      stdoutCallback = null;
+    }
+    
+    firstPrompt = false;
+  }
+}
+
+function doConvertTask(task, callback)
+{
+  abiword.stdin.write("convert " + task.srcFile + " " + task.destFile + " " + task.type + "\n");
+  
+  //create a callback that calls the task callback and the caller callback
+  stdoutCallback = function (err)
+  {
+    callback();
+    task.callback(err);
+  };
+}
+
+exports.convertFile = function(srcFile, destFile, type, callback)
+{
+  queue.push({"srcFile": srcFile, "destFile": destFile, "type": type, "callback": callback});
+};