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/**
* Controls the communication with the Abiword application
*/
/*
* 2011 Peter 'Pita' Martischka (Primary Technology Ltd)
*
* 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");
var os = require('os');
var doConvertTask;
//on windows we have to spawn a process for each convertion, cause the plugin abicommand doesn't exist on this platform
if(os.type().indexOf("Windows") > -1)
{
var stdoutBuffer = "";
doConvertTask = function(task, callback)
{
//span an abiword process to perform the conversion
var abiword = spawn(settings.abiword, ["--to=" + task.destFile, task.srcFile]);
//delegate the processing of stdout to another function
abiword.stdout.on('data', function (data)
{
//add data to buffer
stdoutBuffer+=data.toString();
});
//append error messages to the buffer
abiword.stderr.on('data', function (data)
{
stdoutBuffer += data.toString();
});
//throw exceptions if abiword is dieing
abiword.on('exit', function (code)
{
if(code != 0) {
return callback("Abiword died with exit code " + code);
}
if(stdoutBuffer != "")
{
console.log(stdoutBuffer);
}
callback();
});
}
exports.convertFile = function(srcFile, destFile, type, callback)
{
doConvertTask({"srcFile": srcFile, "destFile": destFile, "type": type}, callback);
};
}
//on unix operating systems, we can start abiword with abicommand and communicate with it via stdin/stdout
//thats much faster, about factor 10
else
{
//spawn the abiword process
var abiword;
var stdoutCallback = null;
var spawnAbiword = function (){
abiword = spawn(settings.abiword, ["--plugin", "AbiCommand"]);
var stdoutBuffer = "";
var firstPrompt = true;
//append error messages to the buffer
abiword.stderr.on('data', function (data)
{
stdoutBuffer += data.toString();
});
//abiword died, let's restart abiword and return an error with the callback
abiword.on('exit', function (code)
{
spawnAbiword();
stdoutCallback("Abiword died with exit code " + code);
});
//delegate the processing of stdout to a other function
abiword.stdout.on('data',function (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 err = stdoutBuffer.search("OK") != -1 ? null : stdoutBuffer;
//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;
}
});
}
spawnAbiword();
doConvertTask = function(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();
console.log("queue continue");
task.callback(err);
};
}
//Queue with the converts we have to do
var queue = async.queue(doConvertTask, 1);
exports.convertFile = function(srcFile, destFile, type, callback)
{
queue.push({"srcFile": srcFile, "destFile": destFile, "type": type, "callback": callback});
};
}
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