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@daggerhart
Last active August 29, 2015 14:02
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Wordcamp AVL 2014 - Introduction to Wordpress Plugin Development
<?php
/*
Plugin Name: Intro to Wordpres Plugin Development
Description: Generic example plugin
Plugin URI: http://www.daggerhart.com/blog/introduction-wordpress-plugin-development/
Author: Jonathan Daggerhart
Author URI: http://www.daggerhart.com
Version: 1.0
Text Domain: intro-to-plugin-dev
Domain: /lang
License: GPL2
*/
define( 'ITPD_PLUGIN_FILE', __FILE__);
define( 'ITPD_PLUGIN_DIR', dirname( __FILE__ ) );
define( 'ITPD_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
/*
* init action
* http://codex.wordpress.org/Function_Reference/add_action
*/
function itpd_init(){
//print 'this happened'; exit; // proof
wp_register_style( 'itpd_css', ITPD_PLUGIN_URL. '/itpd.css' );
wp_enqueue_style( 'itpd_css' );
}
add_action( 'init', 'itpd_init' );
/*
* the_content filter
* http://codex.wordpress.org/Function_Reference/add_filter
*/
// Simple find and replace
function itpd_the_content_simple($content){
return str_ireplace("FINDME", "REPLACE WITH ME", $content);
}
add_filter( 'the_content', 'itpd_the_content_simple');
/*
shortcodes - [itpd_hr], [itpd_link id=1], [itpd_color color="purple"]
*/
/*
* shortcode hr
* http://codex.wordpress.org/Function_Reference/add_shortcode
*/
function itpd_shortcode_hr($attributes){
return '<hr class="itpd_hr" />';
}
add_shortcode( 'itpd_hr', 'itpd_shortcode_hr' );
/*
* shortcode post link
* http://codex.wordpress.org/Function_Reference/add_shortcode
*/
function itpd_link_to_post($attributes){
$default_attributes = array(
'id' => '',
);
$merged_attributes = shortcode_atts( $default_attributes, $attributes );
extract( $merged_attributes );
if (!empty($id)){
$href = get_permalink($id);
$title = get_the_title($id);
return "<a class='itpd_link' href='$href' title='$title'>$title</a>";
}
}
add_shortcode( 'itpd_link', 'itpd_link_to_post' );
/*
* shortcode color
* http://codex.wordpress.org/Function_Reference/add_shortcode
*/
function itpd_shortcode_color_wrap($attributes, $content = '') {
$default_attributes = array(
'color' => 'black',
);
$merged_attributes = shortcode_atts( $default_attributes, $attributes );
extract( $merged_attributes );
return '<span style="color: '.$color.';">' . $content. '</span>';
}
add_shortcode( 'itpd_color', 'itpd_shortcode_color_wrap' );
/*
* Add add_menu page
* http://codex.wordpress.org/Function_Reference/add_menu_page
*/
function itpd_admin_menu(){
add_menu_page( "Intro To Plugin Dev",
"Intro to Plugin Dev Settings",
'manage_options',
'intro_to_plugin_dev',
'intro_to_plugin_dev_settings');
}
add_action( 'admin_menu', 'itpd_admin_menu' );
/*
* add_menu_page callback
*/
function intro_to_plugin_dev_settings(){
// print 'Here is the custom admin page'; return; // proof
// save the submission
if (isset($_GET['itpd_save'])){
// TODO --
// each of these update_option functions should sanitize data first (not shown in this example)
if (isset($_POST['itpd_find'])){
update_option('itpd_find', $_POST['itpd_find']);
}
if (isset($_POST['itpd_replace'])){
update_option('itpd_replace', $_POST['itpd_replace']);
}
// redirect back to form
wp_redirect($_SERVER['HTTP_REFERER']);
exit();
}
// show the form
intro_to_plugin_dev_settings_form();
}
/*
* Settings page form
*/
function intro_to_plugin_dev_settings_form(){
$itpd_find = get_option( 'itpd_find', '' );
$itpd_replace = get_option( 'itpd_replace', '' );
?>
<div class="wrap">
<h1>Intro to Plugin Dev Settings</h1>
<form action="<?php print $_SERVER['PHP_SELF']; ?>?page=intro_to_plugin_dev&noheader=true&itpd_save=true"
method="post">
<div>
<label>Find: </label><input type="text" name="itpd_find" value="<?php print $itpd_find; ?>" />
<p class="description">The string to find in posts and pages.</p>
</div>
<div>
<label>Replace: </label><input type="text" name="itpd_replace" value="<?php print $itpd_replace; ?>" />
<p class="description">The replacement string.</p>
</div>
<?php submit_button(); ?>
</form>
</div>
<?php
}
/*
* Complex find and replace based on DB setting
*/
function itpd_the_content_with_setting($content){
$itpd_find = get_option('itpd_find', '');
if (!empty($itpd_find)){
// allow for comma separated value
$itpd_find = explode( ",", $itpf_find);
$itpd_find = array_map( "trim", $itpd_find) ;
$itpd_replace = get_option( 'itpd_replace', '' );
return str_ireplace( $itpd_find, $itpd_replace, $content );
}
else {
return $content;
}
}
add_filter( 'the_content', 'itpd_the_content_with_setting' );
// */
// shortcodes in sidebars
add_filter( 'widget_text', 'shortcode_unautop');
add_filter( 'widget_text', 'do_shortcode');
/*
Some test
[itpd_hr]
More text
Link to post: [itpd_link id=1]
[itpd_color color="purple"]This text is purple...[/itpd_color]
FINDME in the body of this post.
This post is by JonDag.
*/
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