New export functionality.

app/Export/Exporter/BasicExporter.php

@@ -0,0 +1,55 @@
+<?php
+/**
+ * BasicExporter.php
+ * Copyright (C) 2016 Sander Dorigo
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+namespace FireflyIII\Export\Exporter;
+
+
+use FireflyIII\Models\ExportJob;
+use Illuminate\Support\Collection;
+
+/**
+ * Class BasicExporter
+ *
+ * @package FireflyIII\Export\Exporter
+ */
+class BasicExporter
+{
+    private $entries;
+
+    /** @var  ExportJob */
+    protected $job;
+
+    /**
+     * BasicExporter constructor.
+     */
+    public function __construct(ExportJob $job)
+    {
+        $this->entries = new Collection;
+        $this->job = $job;
+    }
+
+    /**
+     * @return Collection
+     */
+    public function getEntries()
+    {
+        return $this->entries;
+    }
+
+    /**
+     * @param Collection $entries
+     */
+    public function setEntries(Collection $entries)
+    {
+        $this->entries = $entries;
+    }
+
+
+
+}

app/Export/Exporter/CsvExporter.php

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+<?php
+/**
+ * CsvExporter.php
+ * Copyright (C) 2016 Sander Dorigo
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+namespace FireflyIII\Export\Exporter;
+
+use FireflyIII\Export\Entry;
+use FireflyIII\Models\ExportJob;
+use League\Csv\Writer;
+use SplFileObject;
+
+/**
+ * Class CsvExporter
+ *
+ * @package FireflyIII\Export\Exporter
+ */
+class CsvExporter extends BasicExporter implements ExporterInterface
+{
+    /** @var  string */
+    private $fileName;
+
+    /** @var  resource */
+    private $handler;
+
+    /**
+     * CsvExporter constructor.
+     */
+    public function __construct(ExportJob $job)
+    {
+        parent::__construct($job);
+    }
+
+    /**
+     * @return string
+     */
+    public function getFileName()
+    {
+        return $this->fileName;
+    }
+
+    /**
+     *
+     */
+    public function run()
+    {
+        // create temporary file:
+        $this->tempFile();
+
+        // create CSV writer:
+        $writer = Writer::createFromPath(new SplFileObject($this->fileName, 'a+'), 'w');
+        //the $writer object open mode will be 'w'!!
+
+        // all rows:
+        $rows = [];
+
+        // add header:
+        $first  = $this->getEntries()->first();
+        $rows[] = array_keys(get_object_vars($first));
+
+        // then the rest:
+        /** @var Entry $entry */
+        foreach ($this->getEntries() as $entry) {
+            $rows[] = array_values(get_object_vars($entry));
+
+        }
+        $writer->insertAll($rows);
+    }
+
+    private function tempFile()
+    {
+        $fileName       = $this->job->key . '-records.csv';
+        $this->fileName = storage_path('export') . DIRECTORY_SEPARATOR . $fileName;
+        $this->handler  = fopen($this->fileName, 'w');
+    }
+}

app/Export/Exporter/ExporterInterface.php

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+<?php
+/**
+ * ExporterInterface.php
+ * Copyright (C) 2016 Sander Dorigo
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+namespace FireflyIII\Export\Exporter;
+use Illuminate\Support\Collection;
+
+/**
+ * Interface ExporterInterface
+ *
+ * @package FireflyIII\Export\Exporter
+ */
+interface ExporterInterface
+{
+    /**
+     * @return Collection
+     */
+    public function getEntries();
+
+    /**
+     *
+     */
+    public function run();
+
+    /**
+     * @param Collection $entries
+     *
+     */
+    public function setEntries(Collection $entries);
+
+    /**
+     * @return string
+     */
+    public function getFileName();
+
+}