Support CSV, JSON, and tab-separated text as export formats

Summary: Depends on D18919. Ref T13046. Adds some simple modular exporters.

Test Plan: Exported pull logs in each format.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13046

Differential Revision: https://secure.phabricator.com/D18934

src/infrastructure/export/PhabricatorCSVExportFormat.php

@@ -0,0 +1,47 @@
+<?php
+
+final class PhabricatorCSVExportFormat
+  extends PhabricatorExportFormat {
+
+  const EXPORTKEY = 'csv';
+
+  private $rows = array();
+
+  public function getExportFormatName() {
+    return pht('Comma-Separated Values (.csv)');
+  }
+
+  public function isExportFormatEnabled() {
+    return true;
+  }
+
+  public function getFileExtension() {
+    return 'csv';
+  }
+
+  public function getMIMEContentType() {
+    return 'text/csv';
+  }
+
+  public function addObject($object, array $fields, array $map) {
+    $values = array();
+    foreach ($fields as $key => $field) {
+      $value = $map[$key];
+      $value = $field->getTextValue($value);
+
+      if (preg_match('/\s|,|\"/', $value)) {
+        $value = str_replace('"', '""', $value);
+        $value = '"'.$value.'"';
+      }
+
+      $values[] = $value;
+    }
+
+    $this->rows[] = implode(',', $values);
+  }
+
+  public function newFileData() {
+    return implode("\n", $this->rows);
+  }
+
+}