htmlform: Move HTMLSelectLanguageField into includes/htmlform/fields

This was originally directly under includes/htmlform. This is
a specific type of field, so it should go here instead.

Follows-up d0c31ac988888764.

Change-Id: Iac196068ce2cbca063948bc78d21913482717d9a

1 files changed, 36 insertions, 0 deletions

diff --git a/includes/htmlform/fields/HTMLSelectLanguageField.php b/includes/htmlform/fields/HTMLSelectLanguageField.php
new file mode 100644
index 000000000000..98cf3b19c453
--- /dev/null
+++ b/includes/htmlform/fields/HTMLSelectLanguageField.php
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * Language select field.
+ */
+class HTMLSelectLanguageField extends HTMLSelectField {
+	public function __construct( $params ) {
+		parent::__construct( $params );
+
+		if ( $this->mParent instanceof HTMLForm ) {
+			$config = $this->mParent->getConfig();
+			$languageCode = $config->get( 'LanguageCode' );
+		} else {
+			global $wgLanguageCode;
+			$languageCode = $wgLanguageCode;
+		}
+
+		$languages = Language::fetchLanguageNames( null, 'mw' );
+
+		// Make sure the site language is in the list;
+		// a custom language code might not have a defined name…
+		if ( !array_key_exists( $languageCode, $languages ) ) {
+			$languages[$languageCode] = $languageCode;
+		}
+
+		ksort( $languages );
+
+		foreach ( $languages as $code => $name ) {
+			$this->mParams['options'][$code . ' - ' . $name] = $code;
+		}
+
+		if ( !array_key_exists( 'default', $params ) ) {
+			$this->mParams['default'] = $languageCode;
+		}
+	}
+}