16. April 2016

Docker layouts with GoldenLayout

GoldenLayout is a web based docker layout engine that aids in creating flexible user interfaces by enabling panels to be docked on the screen.

Native popup windows
Completely themeable
Comprehensive API
Powerful persistence
Works in IE8+, Firefox, Chrome

GitHub & Demo

12. April 2016

Cross browser audio/video/screen recording via webRTC – MediaStreamRecorder

MediaStreamRecorder.js is a cross-browser implementation to record audio & video streams via WebRTC. The lib allows you to submit/upload recorded blobs in realtime to your server.

Record audio+video in Chrome

<script src="https://cdn.webrtc-experiment.com/MediaStreamRecorder.js"> </script>
<script>
var mediaConstraints = {
    audio: true,
    video: true
};

navigator.getUserMedia(mediaConstraints, onMediaSuccess, onMediaError);

function onMediaSuccess(stream) {
    var multiStreamRecorder = new MultiStreamRecorder(stream);
    multiStreamRecorder.video = yourVideoElement; // to get maximum accuracy
    multiStreamRecorder.audioChannels = 1;
    multiStreamRecorder.ondataavailable = function (blobs) {
        // blobs.audio
        // blobs.video
    };
    multiStreamRecorder.start(3 * 1000);
}

function onMediaError(e) {
    console.error('media error', e);
}
</script>

var mediaConstraints = {

audio: true,

video: true

};

navigator.getUserMedia(mediaConstraints, onMediaSuccess, onMediaError);

function onMediaSuccess(stream) {

var multiStreamRecorder = new MultiStreamRecorder(stream);

multiStreamRecorder.video = yourVideoElement; // to get maximum accuracy

multiStreamRecorder.audioChannels = 1;

multiStreamRecorder.ondataavailable = function (blobs) {

// blobs.audio

// blobs.video

};

multiStreamRecorder.start(3 * 1000);

}

function onMediaError(e) {

console.error('media error', e);

}

</script>

Uploading and receiving via PHP

<?php
foreach(array('video', 'audio') as $type) {
    if (isset($_FILES["${type}-blob"])) {

        $fileName = $_POST["${type}-filename"];
        $uploadDirectory = "uploads/$fileName";

        if (!move_uploaded_file($_FILES["${type}-blob"]["tmp_name"], $uploadDirectory)) {
            echo("problem moving uploaded file");
        }

        echo($uploadDirectory);
    }
}
?>

<?php

foreach(array('video', 'audio') as $type) {

if (isset($_FILES["${type}-blob"])) {

$fileName = $_POST["${type}-filename"];

$uploadDirectory = "uploads/$fileName";

if (!move_uploaded_file($_FILES["${type}-blob"]["tmp_name"], $uploadDirectory)) {

echo("problem moving uploaded file");

}

echo($uploadDirectory);

}

API documentation / GitHub

10. April 2016

Take a screenshot of a DOM container and use it as a background image

I am currently developing a drag and drop interface for a course builder. Courses are split into lessons and lessons into slides. While switching between slides, I wanted to have a small thumbnail representing the current slide content.

One option would have been to use something like PhantomJS / CasperJS. A headless browser , to take a screenshot of the slide. I have done that in the past and it works perfectly.

This time, I decided to go with another solution, that allows me to convert html to a canvas element.

The project is called html2canvas (GitHub).

“This script allows you to take screenshots of webpages or parts of it, directly on the users browser. The screenshot is based on the DOM and as such may not be 100% accurate to the real representation as it does not make an actual screenshot, but builds the screenshot based on the information available on the page.”

EXAMPLE

html2canvas(document.body, {
  onrendered: function(canvas) {
    document.body.appendChild(canvas);
  }
});

html2canvas(document.body, {

onrendered: function(canvas) {

document.body.appendChild(canvas);

}

});

CANVAS TO BACKGROUND IMAGE

I have a slide container (#slideContainer), that holds the active slide for editing and a thumb navigation to switch between slides (.slide.thumb).

var current = $(".slide.thumb.active");

html2canvas($("#slideContainer").get(0), {
  onrendered: function(canvas) {
	  
   var dataURL = canvas.toDataURL();
   current.css({"background" :"url("+dataURL+")", 
                "background-size":"contain", 
                "background-position": "center",
                "background-repeat":"no-repeat"});
  }
});

var current = $(".slide.thumb.active");

html2canvas($("#slideContainer").get(0), {

onrendered: function(canvas) {

var dataURL = canvas.toDataURL();

current.css({"background" :"url("+dataURL+")",

"background-size":"contain",

"background-position": "center",

"background-repeat":"no-repeat"});

}

});

When switching between slides, I am doing a snapshot of the current slideContainer and add it as a new background image to the thumb navigation item for that slide. This is done with canvas.toDataURL() and by embedding the resulting image using a data: url.

Works perfectly. html2canvas has no full css support, so the output will not always match 100%, but its close enough to get a glimpse of what is stored per slide ;)

html2canvas
PhantomJS
CasperJS

Enjoy coding …

24. March 2016

Code snippet manager for GitHub Gists –

“Gisto is a code snippet manager that runs on GitHub Gists and adds additional features such as searching, tagging and sharing gists while including a rich code editor. All your data is stored on GitHub and you can access it from GitHub Gists at any time with changes carrying over to Gisto.”

The application is multi-platform.

Gisto

24. March 2016

Open Source Email Template Builder – Mosaico

“Mosaico is a JavaScript library (or maybe a single page application) supporting the editing of email templates.

The great thing is that Mosaico itself does not define what you can edit or what styles you can change: this is defined by the template.

This makes Mosaico very flexible.”

GitHub

14. March 2016

iOS Apps for developers

IDE – Integrated development environment

Koder is still my main solution, with a bunch of features I do not want to miss on the go.
- Syntax Highlighting
- Code Autocomplete
- Code Function list
- Access and Manage your Dropbox, (S)FTP, webdav and local files easily
- Built In Terminal (SSH Client)
- Built In Snippet Manager
- Tabbed editing
- Extra Keyboard with Custom Key
- iOS8 Document Picker Support to open/import/export other app files from/to Koder
- Find and replace code
- Previewer Browser with Firebug Support + View Source function
- Editor theme with Custom Theme Editor
- Extra Key / Additional Keys on Virtual Keyboard with open+close brackets keys
- Screen
- Lock, Manual and Auto Lock
- Extracting Zip File on Local project
- Sophisticated File Browser
- iOS “Open In” support, from Koder to other app
- vice versa
- Change file/folder permission (CHMOD) on FTP/SFTP projects
- Folder Synchronization between Local Project and FTP Project
- Uploading files from desktop from browser or iTunes sharing
- Expandable editing space
- Bluetooth Keyboard Support
- and many more
DraftCode PHP IDE is a complete PHP and webserver environment that works offline on your iPad or iPhone
Coda is powerful, and portable text editor.
- A stunningly full
- featured text editor
- Works on both the iPhone or iPad
- Editor features Clips, Find & Replace (with placeholder!), Context Keys, Super Loupe, much more.
- Syntax highlighting for Apache, C, CSS, Diff, Go, Haml, HTML, INI, Java, JavaScript, LESS, Lua, Markdown, Perl, PHP, Python, Ruby, Sass, Scheme, Shell, SQL, Swift, XML and YAML
- Local or Remote file management
- Remote protocols include FTP, WebDAV, Amazon S3, DreamObjects, and FTP (Plain, TLS, SSL) support
- Preview
- Air Preview for use with Coda for Mac
- Playgrounds
- SSH Terminal
- Much more!
Textastic is an advanced code editor for iPad with support for syntax highlighting, (S)FTP and Dropbox.

FTP

FTPOnTheGo – A desktop class, award winning FTP client
iTransfer
FTP Client Pro

SSH Terminal

iTerminal – SSH Telnet Client
SSH Terminal
Serverauditor – SSH Shell / Console / Terminal

DOCUMENTATION

Dash is an API Documentation Browser that gives your iPad and iPhone instant offline access to 150+ API documentation sets.

REPOSITORIES

CodeBucket is the best way to browse and maintain your Bitbucket repositories on any iPhone, iPod Touch, and iPad
Git2Go is the first app which unleashes your full development productivity from everywhere.
GitLab Control is the best way to manage your GitLab projects on any iPhone, iPod Touch and iPad device

Enjoy coding …

6. March 2016

The world’s okayest responsive navigation – okayNav for jQuery

okayNav aims to progressively collapse navigation links into an off-screen navigation, instead of doing it for all the links at the same time.

okayNav@GitHub

4. March 2016

Make Syntax Highlighting work in AMP-WP using GeSHi

Again another Google AMP article, this time dealing with Syntax Highlighting. If you have a code centric website, this is important.

In one of my last articles I talked about a Generic Syntax Highlighter. This time I want to show you, how to add Syntax Highlighting with GeSHi to a custom template in AMP-WP.

FIRST SOME RESOURCES

Please read up on documentation, as I am not diving into every detail.

AMP-WP – github.com/Automattic/amp-wp / Documentation
The WordPress AMP integration. We will be using a custom template for our AMP pages.
Crayon Syntax Highlighter – github.com/aramk/crayon-syntax-highlighter
I am using this for Syntax Highlighting on none AMP pages. It adds specific language classes to the code / pre areas, that I am using to configure GeSHi.
GeSHi – github.com/GeSHi/geshi-1.0
The Syntax Highlighter
phpQuery – github.com/punkave/phpQuery
DOM Document transversal & modification simplified. You should be able to apply the things below with any other tool as well.
My tweaks on GitHub

ADDING GESHI TO AMP-WP

Upload GeSHi and phpQuery to your desired location on your webserver.

Call the custom template for AMP-WP in your functions.php

add_filter( 'amp_post_template_file', 'xyz_amp_set_custom_template', 10, 3 );

function xyz_amp_set_custom_template( $file, $type, $post ) {
    if ( 'single' === $type ) {
        $file = dirname( __FILE__ ) . '/templates/my-amp-template.php';
    }
    return $file;
}

add_filter( 'amp_post_template_file', 'xyz_amp_set_custom_template', 10, 3 );

function xyz_amp_set_custom_template( $file, $type, $post ) {

if ( 'single' === $type ) {

$file = dirname( __FILE__ ) . '/templates/my-amp-template.php';

}

return $file;

}

I have an example stored on GitHub

Create a custom template in your themes folder.We could use the following filters, but its easier to use the custom template, due to the GeSHi style setup. The problem is, that the style action is called before the content action within the template. But I am planning to build a TWIG template for myself, as I am running Timber everywhere. That will detach logic and content completely, allowing to rethink some of these things and make styling a lot easier :) So watch out for my next article!

add_action( 'pre_amp_render_post', 'xyz_amp_add_custom_actions' );
add_action( 'amp_post_template_css', 'xyz_amp_my_additional_css_styles' );

1 2	add_action( 'pre_amp_render_post', 'xyz_amp_add_custom_actions' ); add_action( 'amp_post_template_css', 'xyz_amp_my_additional_css_styles' );

Add this to the top of your custom template:

 // Load phpQuery
require ('my-libs/phpQuery/phpQuery.php');

// Load GesSHi
require ('my-libs/geshi/geshi.php');

// Get AMP content and add it to phpQuery

$doc = phpQuery::newDocumentHTML($this->get('post_amp_content'));
$highlight = array();

// Loop through the code snippets (pre tags)

foreach(pq('pre') as $snippet) {

	// Get classes of tag

	$class = pq($snippet)->attr("class");

	// Check for Crayon Syntax Highlighter Class

	if (strpos($class, "lang:") !== false && strpos($class, "lang:default") === false) {
		preg_match("/lang:(?P<lang>\w+)/", $class, $catch);
	}
	else {

		// Fallback, if no language is detected

		$catch['lang'] = "php";
	}

	// New Syntax Highlighter for each code snippet, with the correct language set
	// Storing for later stylesheet output. This makes also sure that stylesheets are only loaded once.

	$highlight[$catch['lang']] = new GeSHi(pq($snippet)->text() , $catch['lang']);

	// Uses Classes and no inlien styles

	$highlight[$catch['lang']]->enable_classes();

	// Update code snippet

	$html = pq($snippet)->html($highlight[$catch['lang']]->parse_code());
}

// Load phpQuery

require ('my-libs/phpQuery/phpQuery.php');

// Load GesSHi

require ('my-libs/geshi/geshi.php');

// Get AMP content and add it to phpQuery

$doc = phpQuery::newDocumentHTML($this->get('post_amp_content'));

$highlight = array();

// Loop through the code snippets (pre tags)

foreach(pq('pre') as $snippet) {

// Get classes of tag

$class = pq($snippet)->attr("class");

// Check for Crayon Syntax Highlighter Class

if (strpos($class, "lang:") !== false && strpos($class, "lang:default") === false) {

preg_match("/lang:(?P<lang>\w+)/", $class, $catch);

}

else {

// Fallback, if no language is detected

$catch['lang'] = "php";

}

// New Syntax Highlighter for each code snippet, with the correct language set

// Storing for later stylesheet output. This makes also sure that stylesheets are only loaded once.

$highlight[$catch['lang']] = new GeSHi(pq($snippet)->text() , $catch['lang']);

// Uses Classes and no inlien styles

$highlight[$catch['lang']]->enable_classes();

// Update code snippet

$html = pq($snippet)->html($highlight[$catch['lang']]->parse_code());

}

I have an example stored on GitHub. The above works, if you are using Crayon Syntax Highlighter for standard pages.
If you use something else, this needs to be changed.

Add the GeSHi styles to the amp-custom style tag

<style amp-custom>
<?php $this->load_parts( array( 'style' ) );
?><?php 
 do_action( 'amp_post_template_css', $this );
    
 // Load Stylesheets for highlighted languages
	
 foreach($highlight as $store){
  echo $store->get_stylesheet();
 }
?>
</style>

<?php $this->load_parts( array( 'style' ) );

?><?php

do_action( 'amp_post_template_css', $this );

// Load Stylesheets for highlighted languages

foreach($highlight as $store){

echo $store->get_stylesheet();

}

</style>

I have an example stored on GitHub.

Output updated amp-wp-content

<div class="amp-wp-content">
	<h1 class="amp-wp-title"><?php echo wp_kses_data( $this->get( 'post_title' ) ); ?></h1>
	<ul class="amp-wp-meta">
		<?php $this->load_parts( apply_filters( 'amp_post_template_meta_parts', array( 'meta-author', 'meta-time', 'meta-taxonomy' ) ) ); ?>
	</ul>
	<?php  echo  $doc->html();  // amphtml content; no kses ?>
</div>

<h1 class="amp-wp-title"><?php echo wp_kses_data( $this->get( 'post_title' ) ); ?></h1>

<?php $this->load_parts( apply_filters( 'amp_post_template_meta_parts', array( 'meta-author', 'meta-time', 'meta-taxonomy' ) ) ); ?>

</ul>

<?php echo $doc->html(); // amphtml content; no kses ?>

</div>

I have an example stored on GitHub.

Save and check that your AMP page validates, by adding #development=1 to the end of the url. Check the console for errors.
Show this page as AMP

Enjoy coding …

3. March 2016

Generic Syntax Highlighting with Regular Expressions in pure PHP

Due to Google AMP (Accelerated Mobile Pages) , I have been looking for a way to effectively do Syntax Highlighting without Javascript in pure PHP.

I was about to write my own, when I found an older article from phoboslab. Thanks Dominic for saving me some time ;) Its not perfect, but close enough.

A simple Syntax Highlighting Class that does just that. The class was not working with PHP 5.4.x+, as it uses preg_replace() with the /e modifier.

It will not cover all, but its better than nothing :) I will also add a section to my my AMP tweaks article to showcase the integration of Geshi.

Here an updated version using the preg_replace_callback() function.

THE SYNTAX HIGHLIGHT CLASS

class SyntaxHighlight {
   
    static $tokens = array();// This array will be filled from the regexp-callback

    public static function process($s) {
        $s = htmlspecialchars($s);

        // Workaround for escaped backslashes
        $s = str_replace('\\\\','\\\\<e>', $s); 

        $regexp = array(

            // Punctuations
            '/([\-\!\%\^\*\(\)\+\|\~\=`\{\}\[\]\:\"\'<>\?\,\.\/]+)/'
            => '<span class="P">$1</span>',

            // Numbers (also look for Hex)
            '/(?<!\w)(
                (0x|\#)[\da-f]+|
                \d+|
                \d+(px|em|cm|mm|rem|s|\%)
            )(?!\w)/ix'
            => '<span class="N">$1</span>',

            // Make the bold assumption that an
            // all uppercase word has a special meaning
            '/(?<!\w|>|\#)(
                [A-Z_0-9]{2,}
            )(?!\w)/x'
            => '<span class="D">$1</span>',

            // Keywords
            '/(?<!\w|\$|\%|\@|>)(
                and|or|xor|for|do|while|foreach|as|return|die|exit|if|then|else|
                elseif|new|delete|try|throw|catch|finally|class|function|string|
                array|object|resource|var|bool|boolean|int|integer|float|double|
                real|string|array|global|const|static|public|private|protected|
                published|extends|switch|true|false|null|void|this|self|struct|
                char|signed|unsigned|short|long
            )(?!\w|=")/ix'
            => '<span class="K">$1</span>',

            // PHP/Perl-Style Vars: $var, %var, @var
            '/(?<!\w)(
                (\$|\%|\@)(\->|\w)+
            )(?!\w)/ix'
            => '<span class="V">$1</span>'

        );      
	
        $s = preg_replace_callback( '/(
                \/\*.*?\*\/|
                \/\/.*?\n|
                \#.[^a-fA-F0-9]+?\n|
                \<\!\-\-[\s\S]+\-\-\>|
                (?<!\\\)&quot;.*?(?<!\\\)&quot;|
                (?<!\\\)\'(.*?)(?<!\\\)\'
            )/isx' , array('SyntaxHighlight', 'replaceId'),$s);
			
        $s = preg_replace(array_keys($regexp), array_values($regexp), $s);

        // Paste the comments and strings back in again
        $s = str_replace(array_keys(SyntaxHighlight::$tokens), array_values(SyntaxHighlight::$tokens), $s);

        // Delete the "Escaped Backslash Workaround Token" (TM)
        // and replace tabs with four spaces.
        $s = str_replace(array('<e>', "\t"), array('', '    '), $s);

        return '<pre>'.$s.'</pre>' ;
    }

    // Regexp-Callback to replace every comment or string with a uniqid and save
    // the matched text in an array
    // This way, strings and comments will be stripped out and wont be processed
    // by the other expressions searching for keywords etc.
     static function replaceId($match) {
        $id = "##r" . uniqid() . "##";
	
        // String or Comment?
        if(substr($match[1], 0, 2) == '//' || substr($match[1], 0, 2) == '/*' || substr($match[1], 0, 2) == '##' || substr($match[1], 0, 7) == '<!--') {
            SyntaxHighlight::$tokens[$id] = '<span class="C">' . $match[1] . '</span>';
        } else {
           SyntaxHighlight::$tokens[$id] = '<span class="S">' . $match[1] . '</span>';
        }
		
        return $id;
    }
}

class SyntaxHighlight {

static $tokens = array();// This array will be filled from the regexp-callback

public static function process($s) {

$s = htmlspecialchars($s);

// Workaround for escaped backslashes

$s = str_replace('\\\\','\\\\<e>', $s);

$regexp = array(

// Punctuations

'/([\-\!\%\^\*\+\|\~\=`\{\}\[\]\:\"\'<>\?\,\.\/]+)/'

=> '<span class="P">$1</span>',

// Numbers (also look for Hex)

'/(?<!\w)(

(0x|\#)[\da-f]+|

\d+|

\d+(px|em|cm|mm|rem|s|\%)

)(?!\w)/ix'

=> '<span class="N">$1</span>',

// Make the bold assumption that an

// all uppercase word has a special meaning

'/(?<!\w|>|\#)(

[A-Z_0-9]{2,}

)(?!\w)/x'

=> '<span class="D">$1</span>',

// Keywords

'/(?<!\w|\$|\%|\@|>)(

and|or|xor|for|do|while|foreach|as|return|die|exit|if|then|else|

char|signed|unsigned|short|long

)(?!\w|=")/ix'

=> '<span class="K">$1</span>',

// PHP/Perl-Style Vars: $var, %var, @var

'/(?<!\w)(

(\$|\%|\@)(\->|\w)+

)(?!\w)/ix'

=> '<span class="V">$1</span>'

);

$s = preg_replace_callback( '/(

\/\*.*?\*\/|

\/\/.*?\n|

\#.[^a-fA-F0-9]+?\n|

\<\!\-\-[\s\S]+\-\-\>|

(?<!\\\)".*?(?<!\\\)"|

(?<!\\\)\'(.*?)(?<!\\\)\'

)/isx' , array('SyntaxHighlight', 'replaceId'),$s);

$s = preg_replace(array_keys($regexp), array_values($regexp), $s);

// Paste the comments and strings back in again

$s = str_replace(array_keys(SyntaxHighlight::$tokens), array_values(SyntaxHighlight::$tokens), $s);

// Delete the "Escaped Backslash Workaround Token" (TM)

// and replace tabs with four spaces.

$s = str_replace(array('<e>', "\t"), array('', ' '), $s);

return '<pre>'.$s.'</pre>' ;

}

// Regexp-Callback to replace every comment or string with a uniqid and save

// the matched text in an array

// This way, strings and comments will be stripped out and wont be processed

// by the other expressions searching for keywords etc.

static function replaceId($match) {

$id = "##r" . uniqid() . "##";

// String or Comment?

if(substr($match[1], 0, 2) == '//' || substr($match[1], 0, 2) == '/*' || substr($match[1], 0, 2) == '##' || substr($match[1], 0, 7) == '<!--') {

SyntaxHighlight::$tokens[$id] = '<span class="C">' . $match[1] . '</span>';

} else {

SyntaxHighlight::$tokens[$id] = '<span class="S">' . $match[1] . '</span>';

}

return $id;

}

THE CSS

pre { 
	font-family: 'Courier New', 'Bitstream Vera Sans Mono', 'monospace'; 
	font-size: 9pt;
	border-top: 1px solid #333;
	border-bottom: 1px solid #333;
	padding: 0.4em;
	color: #fff;
}
pre span.N{ color:#f2c47f; } /* Numbers */
pre span.S{ color:#42ff00; } /* Strings */
pre span.C{ color:#838383; } /* Comments */
pre span.K{ color:#ff0078; } /* Keywords */
pre span.V{ color:#70d6ff; } /* Vars */
pre span.D{ color:#ff9a5d; } /* Defines */

pre {

font-family: 'Courier New', 'Bitstream Vera Sans Mono', 'monospace';

font-size: 9pt;

border-top: 1px solid #333;

border-bottom: 1px solid #333;

padding: 0.4em;

color: #fff;

}

pre span.N{ color:#f2c47f; } /* Numbers */

pre span.S{ color:#42ff00; } /* Strings */

pre span.C{ color:#838383; } /* Comments */

pre span.K{ color:#ff0078; } /* Keywords */

pre span.V{ color:#70d6ff; } /* Vars */

pre span.D{ color:#ff9a5d; } /* Defines */

USAGE

echo SyntaxHighlight::process( $your_code );

1	echo SyntaxHighlight::process( $your_code );

@GitHub portalzine/UtilityBelt/SyntaxHighlight

Enjoy coding …

29. February 2016

AMP-WP Tweaks & Tips

The AMP (Accelerated Mobile Pages Project) plugin for WordPress is still pretty young and under heavy development.

There are little things that can help to fix current validation problems. I have a couple of fresh AMP pages, that are already indexed by Google.

0. RESOURCES

1. MISSING IMAGE (schema.org-NewsArticle)

The currently registered Microformats template (schema.org-NewsArticle) requires an image.
The AMP-WP documentation explains how to add a featured image to your pages (documentation).

I extended that a bit, to link a default attachment image, I uploaded before. This needs to be added to your themes functions.php.

function xyz_amp_add_custom_actions() {
    add_filter( 'the_content', 'xyz_amp_add_featured_image' );
}

function xyz_amp_add_featured_image( $content ) {

 $your_attachment_id = 2016;

 if ( has_post_thumbnail() ) {
  $image = sprintf( '<p class="xyz-featured-image">%s</p>', get_the_post_thumbnail() );
        
 }else{
 $image = sprintf( '<p class="xyz-featured-image">%s</p>', wp_get_attachment_image( $your_attachment_id, 1280) );
        $content = $image . $content ;
 }
 $content = $image . $content ;
 return preg_replace('/(<br>\s*){2,}/', '<br/>',$content);
}

function xyz_amp_add_custom_actions() {

add_filter( 'the_content', 'xyz_amp_add_featured_image' );

}

function xyz_amp_add_featured_image( $content ) {

$your_attachment_id = 2016;

if ( has_post_thumbnail() ) {

$image = sprintf( '<p class="xyz-featured-image">%s</p>', get_the_post_thumbnail() );

}else{

$image = sprintf( '<p class="xyz-featured-image">%s</p>', wp_get_attachment_image( $your_attachment_id, 1280) );

$content = $image . $content ;

}

$content = $image . $content ;

return preg_replace('/(<br>\s*){2,}/', '<br/>',$content);

}

Next we adjust the Microformats definition. This needs to be added to your themes functions.php.

add_filter( 'amp_post_template_metadata', 'xyz_amp_modify_json_metadata', 10, 2 );

function xyz_amp_modify_json_metadata( $metadata, $post ) {
  if(empty($metadata['image'])){
    $your_attachment_id = 2016;
    $imgMeta = wp_get_attachment_metadata($your_attachment_id );
    $metadata['image'] = array(
        '@type' => 'ImageObject',
        'url' => wp_get_attachment_url( $your_attachment_id ),
        'height' => $imgMeta['height'],
        'width' =>  $imgMeta['width'],
    );
  }
    return $metadata;
}

add_filter( 'amp_post_template_metadata', 'xyz_amp_modify_json_metadata', 10, 2 );

function xyz_amp_modify_json_metadata( $metadata, $post ) {

if(empty($metadata['image'])){

$your_attachment_id = 2016;

$imgMeta = wp_get_attachment_metadata($your_attachment_id );

$metadata['image'] = array(

'@type' => 'ImageObject',

'url' => wp_get_attachment_url( $your_attachment_id ),

'height' => $imgMeta['height'],

'width' => $imgMeta['width'],

);

}

return $metadata;

}

2. ADD YOUR OWN AMP TEMPLATE

Read the AMP-WP documentation first :) This forces AMP-WP to override the core template with your own. Use the default template as a reference.

add_filter( 'amp_post_template_file', 'xyz_amp_set_custom_template', 10, 3 );

function xyz_amp_set_custom_template( $file, $type, $post ) {
    if ( 'single' === $type ) {
        $file = dirname( __FILE__ ) . '/amp/amp_template.php';
    }
    return $file;
}

add_filter( 'amp_post_template_file', 'xyz_amp_set_custom_template', 10, 3 );

function xyz_amp_set_custom_template( $file, $type, $post ) {

if ( 'single' === $type ) {

$file = dirname( __FILE__ ) . '/amp/amp_template.php';

}

return $file;

}

3. REMOVE NONE VALIDATING CONTENT

Normally the core sanitizer should take care of that. I am sure a filter will be added in the future. For now, this is a quick workaround. You can use a RegExp or DOMDocument to alter the amp-content in your custom template and filter things that break validation.

$attributes = $element->attributes;
while ($attributes->length) {
    $element->removeAttribute($attributes->item(0)->name);
}

$attributes = $element->attributes;

while ($attributes->length) {

$element->removeAttribute($attributes->item(0)->name);

}

I am using phpQuery for now, as it allows me to add quick fixes. DOMNode or QueryPath works nicely as well :) Will be looking at the core sanitizer and options later this week. All of this is currently added to the custom template.

 require('your-libs/phpQuery/phpQuery.php');
 $doc = phpQuery::newDocumentHTML($this->get( 'post_amp_content' ));

1 2	require('your-libs/phpQuery/phpQuery.php'); $doc = phpQuery::newDocumentHTML($this->get( 'post_amp_content' ));

Remove REL attributes that are not allowed. Only registered Microformat rel attributes are allowed.

$doc['.prettyphoto']->removeAttr("rel");

1

$doc['.prettyphoto']->removeAttr("rel");
Remove attribute ALIGN

$doc['*']->removeAttr("align");

1

$doc['*']->removeAttr("align");
Fix TARGET Attribute

$doc['a[target="new"]']->attr("target","_blank");

1

$doc['a[target="new"]']->attr("target","_blank");

Finally output the fixed content as HTML.

 echo  $doc->html(); // amphtml content; no kses

1	echo $doc->html(); // amphtml content; no kses

The above examples need to be tweaked to your specific content requirements.

The custom template “post_amp_content” before:

 echo $this->get( 'post_amp_content'); // amphtml content; no kses

1	echo $this->get( 'post_amp_content'); // amphtml content; no kses

The custom template “post_amp_content” after:

 require('your-libs/phpQuery/phpQuery.php');
 $doc = phpQuery::newDocumentHTML($this->get( 'post_amp_content' )); 
 $doc['.prettyphoto']->removeAttr("rel")->removeAttr("href");
 $doc['*']->removeAttr("align");
 $doc['a[target="new"]']->attr("target","_blank");
 echo  $doc->html(); // amphtml content; no kses

require('your-libs/phpQuery/phpQuery.php');

$doc = phpQuery::newDocumentHTML($this->get( 'post_amp_content' ));

$doc['.prettyphoto']->removeAttr("rel")->removeAttr("href");

$doc['*']->removeAttr("align");

$doc['a[target="new"]']->attr("target","_blank");

echo $doc->html(); // amphtml content; no kses

4. ADD PREVIOUS & NEXT POST NAVIGATION

From the AMP specification :”Note, that AMP document may also be linked to directly…”

This is being added to the custom template as well.

Next:

global $query_string; 
$posts = query_posts($query_string); if (have_posts()) : while (have_posts()) : the_post(); 

$next_post = get_next_post();
if (!empty( $next_post )): 
 echo '<a class="next" href="'.amp_get_permalink( $next_post->ID ).'"> &#8604; '.$next_post->post_title.'</a>';
endif;

global $query_string;

$posts = query_posts($query_string); if (have_posts()) : while (have_posts()) : the_post();

$next_post = get_next_post();

if (!empty( $next_post )):

echo '<a class="next" href="'.amp_get_permalink( $next_post->ID ).'"> ↜ '.$next_post->post_title.'</a>';

endif;

Previous:

$prev_post = get_previous_post();

if (!empty( $prev_post )): 
 echo '<a class="prev" href="'.amp_get_permalink( $prev_post->ID ).'"> &#8604; '.$prev_post->post_title.'</a>';
endif;

$prev_post = get_previous_post();

if (!empty( $prev_post )):

echo '<a class="prev" href="'.amp_get_permalink( $prev_post->ID ).'"> ↜ '.$prev_post->post_title.'</a>';

endif;

5. SYNTAX HIGHLIGHTING

You can find a simple pure PHP highlighter here. Not perfect, but a start. Don not forget to include the CSS :)

require_once("your-lib/SyntaxHighlight/SyntaxHighlight.php");
foreach(pq('pre') as $code)
{
 pq($code)->html(SyntaxHighlight::process(pq($code)->text()));
}

require_once("your-lib/SyntaxHighlight/SyntaxHighlight.php");

foreach(pq('pre') as $code)

{

pq($code)->html(SyntaxHighlight::process(pq($code)->text()));

}

I will extend on this as new validation errors or tweaks come up. The core sanitizer of AMP-WP still needs some work and should allow us to do some of the above directly, when the content is parsed / converted for AMP.

6. OTHER AMP ARTICLES

Make Syntax Highlighting work in AMP-WP using GeSHi

Time to get AMP ready