apisklov · December 30, 2020 12:41 · Jul 12, 2018 · Jul 12, 2018
diff --git a/readme.md b/readme.md
@@ -6,4 +6,10 @@ Also deletes webp versions when image is deleted through media Library
 
 ### Not done
 
-Filter to hook into `the_content` for images uploaded directly into posts.
+Filter to hook into `the_content` for images uploaded directly into posts.
+
+#### Dependencies
+
+Requires rosell-dk/webp-convert
+
+`composer require rosell-dk/webp-convert`
diff --git a/functions.php b/functions.php
@@ -0,0 +1,88 @@
+<?php 
+	// Only dependency that's used
+
+	// TODO: Implement filter for the_content();
+
+	use WebPConvert\WebPConvert;
+
+	add_filter('wp_generate_attachment_metadata', function($meta) {
+
+    $path = wp_upload_dir(); // get upload directory
+    $file = $path['basedir'].'/'.$meta['file']; // Get full size image
+
+    $files[] = $file; // Set up an array of image size urls
+
+    foreach ($meta['sizes'] as $size) {
+      $files[] = $path['path'].'/'.$size['file'];
+    }
+
+    foreach ($files as $file) { // iterate through each image size
+      list($orig_w, $orig_h, $orig_type) = @getimagesize($file);
+      $image = wp_load_image($file);
+
+      switch ($orig_type) {
+        case IMAGETYPE_PNG:
+        case IMAGETYPE_JPEG:
+            $success = WebPConvert::convert($file, $file.'.webp', array(
+					    'quality' => 90,
+					    // more options available!
+					));
+            break;
+      }
+    }
+    return $meta;
+
+	});
+
+
+	add_action('delete_attachment', function ($id){
+	  if(wp_attachment_is_image($id)){
+	  	$path = wp_upload_dir(); // get upload directory
+	    $images  = get_images($id);
+	    foreach ($images as $i) {
+	    	// Need to check if webp version exists, unable to convert all files only PNG and JPG
+	    	if (file_exists(ABSPATH . '..' . wp_make_link_relative( $i ).'.webp')){
+	    		unlink(ABSPATH . '..' . wp_make_link_relative( $i ).'.webp');	
+	    	}
+	    }
+	  }
+	});
+
+	add_filter('post_thumbnail_html', function ($html, $post_id, $post_thumbnail_id, $size, $attr) {
+    $id = get_post_thumbnail_id(); // gets the id of the current post_thumbnail (in the loop)
+    $src = wp_get_attachment_image_src($id, $size); // gets the image url specific to the passed in size (aka. custom image size)
+    $alt = get_the_title($id); // gets the post thumbnail title
+    $class = $attr['class']; // gets classes passed to the post thumbnail, defined here for easier function access
+    if (empty($src)){
+    	$src = wp_get_attachment_image_src($id, 'full'); // gets the image url specific to the passed in size (aka. custom image size)
+    }
+
+    $html = '<picture class="'.$class.'">';
+    // Check if webp version exists, not converting Gif images
+    if (file_exists(ABSPATH . '..' . wp_make_link_relative( $src[0] ).'.webp')){
+    	$html .= '<source srcset="'.$src[0].'.webp" type="image/webp">';	
+    }
+		$html .= '<source srcset="'.$src[0].'" type="image/jpeg">';
+		$html .= '<img src="'.$src[0].'" alt="fallback">';
+		$html .= '</picture>';
+
+
+    return $html;
+	}, 99, 5);
+
+	function get_images($id) {
+		if ( !wp_attachment_is_image( $id ) )
+			return;
+
+		$links = array();
+		$sizes = get_intermediate_image_sizes();
+		$sizes[] = 'full';
+		foreach ( $sizes as $size ) {
+			$image = wp_get_attachment_image_src( get_the_ID(), $size );
+			if ( !empty( $image ) && ( true == $image[3] || 'full' == $size ) )
+				$links[] = $image[0];
+		}
+
+		return $links;
+	}
+?>
diff --git a/readme.md b/readme.md
@@ -0,0 +1,9 @@
+# Webp for WordPress
+
+Converts jpg and png images to webp on upload and hooks into `post_thumbnail_html` to output a `picture` tag with the new format
+
+Also deletes webp versions when image is deleted through media Library
+
+### Not done
+
+Filter to hook into `the_content` for images uploaded directly into posts.
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