Streamline templates, more DRY

Use Unified function to emit <link> tags for css loading, obey "Don't Repeat Yourself" ;-)

(Next step might by to combine this with the emit <script> function (even more DRY?) AND move all this to a better place?)

Signed-off-by: Michael Letzgus <michaelletzgus@users.noreply.github.com>

core/templates/layout.base.php

@@ -12,12 +12,7 @@
 		<link rel="icon" href="<?php print_unescaped(image_path('', 'favicon.ico')); /* IE11+ supports png */ ?>">
 		<link rel="apple-touch-icon-precomposed" href="<?php print_unescaped(image_path('', 'favicon-touch.png')); ?>">
 		<link rel="mask-icon" sizes="any" href="<?php print_unescaped(image_path('', 'favicon-mask.svg')); ?>" color="<?php p($theme->getColorPrimary()); ?>">
-		<?php foreach ($_['cssfiles'] as $cssfile): ?>
-			<link rel="stylesheet" href="<?php print_unescaped($cssfile); ?>">
-		<?php endforeach; ?>
-		<?php foreach($_['printcssfiles'] as $cssfile): ?>
-			<link rel="stylesheet" href="<?php print_unescaped($cssfile); ?>" media="print">
-		<?php endforeach; ?>
+		<?php emit_css_loading_tags($_); ?>
 		<?php emit_script_loading_tags($_); ?>
 		<?php print_unescaped($_['headers']); ?>
 	</head>

core/templates/layout.guest.php

@@ -13,12 +13,7 @@
 		<link rel="icon" href="<?php print_unescaped(image_path('', 'favicon.ico')); /* IE11+ supports png */ ?>">
 		<link rel="apple-touch-icon-precomposed" href="<?php print_unescaped(image_path('', 'favicon-touch.png')); ?>">
 		<link rel="mask-icon" sizes="any" href="<?php print_unescaped(image_path('', 'favicon-mask.svg')); ?>" color="<?php p($theme->getColorPrimary()); ?>">
-		<?php foreach($_['cssfiles'] as $cssfile): ?>
-			<link rel="stylesheet" href="<?php print_unescaped($cssfile); ?>">
-		<?php endforeach; ?>
-		<?php foreach($_['printcssfiles'] as $cssfile): ?>
-			<link rel="stylesheet" href="<?php print_unescaped($cssfile); ?>" media="print">
-		<?php endforeach; ?>
+		<?php emit_css_loading_tags($_); ?>
 		<?php emit_script_loading_tags($_); ?>
 		<?php print_unescaped($_['headers']); ?>
 	</head>

core/templates/layout.user.php

@@ -21,12 +21,7 @@
 		<link rel="apple-touch-icon-precomposed" href="<?php print_unescaped(image_path($_['appid'], 'favicon-touch.png')); ?>">
 		<link rel="mask-icon" sizes="any" href="<?php print_unescaped(image_path($_['appid'], 'favicon-mask.svg')); ?>" color="<?php p($theme->getColorPrimary()); ?>">
 		<link rel="manifest" href="<?php print_unescaped(image_path($_['appid'], 'manifest.json')); ?>">
-		<?php foreach($_['cssfiles'] as $cssfile): ?>
-			<link rel="stylesheet" href="<?php print_unescaped($cssfile); ?>">
-		<?php endforeach; ?>
-		<?php foreach($_['printcssfiles'] as $cssfile): ?>
-			<link rel="stylesheet" href="<?php print_unescaped($cssfile); ?>" media="print">
-		<?php endforeach; ?>
+		<?php emit_css_loading_tags($_); ?>
 		<?php emit_script_loading_tags($_); ?>
 		<?php print_unescaped($_['headers']); ?>
 	</head>

lib/private/legacy/template/functions.php

@@ -38,13 +38,43 @@ function p($string) {
 	print(\OCP\Util::sanitizeHTML($string));
 }
 
+
+/**
+ * Prints a <link> tag for loading css
+ * @param string $href the source URL, ignored when empty
+ * @param string $opts, additional optional options
+*/
+function emit_css_tag($href, $opts = '') {
+	$s='<link rel="stylesheet"';
+	if (!empty($href)) {
+		$s.=' href="' . $href .'"';
+	}
+	if (!empty($opts)) {
+		$s.=' '.$opts;
+	}
+	print_unescaped($s.">\n");
+}
+
+/**
+ * Prints all tags for CSS loading
+ * @param hash $obj all the script information from template
+*/
+function emit_css_loading_tags($obj) {
+	foreach($obj['cssfiles'] as $css) {
+		emit_css_tag($css);
+	}
+	foreach($obj['printcssfiles'] as $css) {
+		emit_css_tag($css, 'media="print"');
+	}
+}
+
 /**
  * Prints a <script> tag with nonce and defer depending on config
  * @param string $src the source URL, ignored when empty
  * @param string $script_content the inline script content, ignored when empty
  * @param bool $defer_flag deferred loading or not
 */
-function emit_script_tag($src, $script_content) {
+function emit_script_tag($src, $script_content='') {
 	$defer_str=' defer';
 	$s='<script nonce="' . \OC::$server->getContentSecurityPolicyNonceManager()->getNonce() . '"';
 	if (!empty($src)) {