Listen for hooks firing within set bounds

assets/_styles.scss

@@ -590,7 +590,8 @@ body.admin-color-light #wp-admin-bar-query-monitor:not(.qm-all-clear):not(:hover
 		margin: 20px !important;
 	}
 
-	.qm-concerns table {
+	.qm-concerns table,
+	.qm-discovered table {
 		border-top: 1px solid $qm-cell-border !important;
 		margin-bottom: 20px !important;
 	}

assets/query-monitor.css

@@ -539,7 +539,8 @@ body.admin-color-light #wp-admin-bar-query-monitor:not(.qm-all-clear):not(:hover
   font-size: 14px !important;
   margin: 20px !important;
 }
-#query-monitor-main .qm-concerns table {
+#query-monitor-main .qm-concerns table,
+#query-monitor-main .qm-discovered table {
   border-top: 1px solid #e0e0e0 !important;
   margin-bottom: 20px !important;
 }

collectors/hooks.php

@@ -14,6 +14,58 @@ public function name() {
 		return __( 'Hooks & Actions', 'query-monitor' );
 	}
 
+	public function __construct() {
+		parent::__construct();
+		add_action( 'qm/listen/start', array( $this, 'action_function_listen_start' ), 10, 1 );
+		add_action( 'qm/listen/stop',  array( $this, 'action_function_listen_stop' ), 10, 1 );
+	}
+
+	public function action_function_listen_start( $label ) {
+		if ( ! array_key_exists( 'discovered_hooks', $this->data ) ) {
+			$this->data['discovered_hooks'] = array();
+		}
+
+		if ( array_key_exists( $label, $this->data['discovered_hooks'] ) ) {
+			return;
+		}
+
+		$this->data['discovered_hooks'][ $label ] = array();
+
+		add_action( 'all', array( $this, 'action_function_listen_all' ), 0, 1 );
+	}
+
+	public function action_function_listen_all( $var = null ) {
+		if ( in_array( current_action(), array(
+			'qm/listen/start',
+			'qm/listen/stop',
+		) ) ) {
+			return $var;
+		}
+
+		global $wp_actions;
+
+		end( $this->data['discovered_hooks'] );
+		$label = key( $this->data['discovered_hooks'] );
+		$last = end( $this->data['discovered_hooks'][ $label ] );
+
+		if ( current_action() === $last['hook'] ) {
+			$i = key( $this->data['discovered_hooks'][ $label ] );
+			$this->data['discovered_hooks'][ $label ][ $i ]['count']++;
+		} else {
+			$this->data['discovered_hooks'][ $label ][] = array(
+				'is_action' => array_key_exists( current_action(), $wp_actions ),
+				'hook' => current_action(),
+				'count' => 1,
+			);
+		}
+
+		return $var;
+	}
+
+	public function action_function_listen_stop( $label ) {
+		remove_action( 'all', array( $this, 'action_function_listen_all' ), 0, 1 );
+	}
+
 	public function process() {
 
 		global $wp_actions, $wp_filter;

output/html/hooks.php

@@ -11,9 +11,25 @@ class QM_Output_Html_Hooks extends QM_Output_Html {
 
 	public function __construct( QM_Collector $collector ) {
 		parent::__construct( $collector );
+		add_filter( 'qm/output/panel_menus', array( $this, 'panel_menus' ) );
 		add_filter( 'qm/output/menus', array( $this, 'admin_menu' ), 80 );
 	}
 
+	public function panel_menus( $panel_menu ) {
+		$data = $this->collector->get_data();
+
+		if ( empty( $data['discovered_hooks'] ) ) {
+			return $panel_menu;
+		}
+
+		$panel_menu[ 'qm-' . $this->id ]['children'][ 'qm-' . $this->id . '-discovered_hooks' ] = array(
+			'href'  => esc_attr( '#' . $this->collector->id() . '-discovered_hooks' ),
+			'title' => '└ ' . __( 'Discovered Hooks', 'query-monitor' ),
+		);
+
+		return $panel_menu;
+	}
+
 	public function output() {
 
 		$data = $this->collector->get_data();
@@ -178,6 +194,65 @@ public static function output_hook_table( array $hooks ) {
 
 	}
 
+	protected function after_tabular_output() {
+		echo '</table>';
+		echo '</div>';
+
+		$this->output_discovered();
+	}
+
+	public function output_discovered() {
+		printf(
+			'<div class="qm qm-discovered" id="%1$s" role="group" aria-labelledby="%1$s" tabindex="-1">',
+			esc_attr( $this->current_id . '-discovered_hooks' )
+		);
+
+		echo '<div><table>';
+
+		printf(
+			'<caption><h2 id="%1$s-caption">%2$s</h2></caption>',
+			esc_attr( $this->current_id . '-discovered_hooks' ),
+			esc_html__( 'Discovered Hooks', 'query-monitor' )
+		);
+
+		echo '<thead>';
+		echo '<tr>';
+		echo '<th scope="col">' . esc_html__( 'Label', 'query-monitor' ) . '</th>';
+		echo '<th scope="col">' . esc_html__( 'Hook', 'query-monitor' ) . '</th>';
+		echo '<th scope="col">' . esc_html__( 'Type', 'query-monitor' ) . '</th>';
+		echo '</tr>';
+		echo '</thead>';
+
+		echo '<tbody>';
+
+		$data = $this->collector->get_data();
+
+		foreach ( $data['discovered_hooks'] as $label => $hooks ) {
+			foreach ( $hooks as $i => $hook ) {
+				echo '<tr>';
+
+				if ( 0 === $i ) {
+					echo '<th scope="row" rowspan="' . esc_attr( count( $hooks ) ) . '" class="qm-nowrap"><span class="qm-sticky">' . esc_html( $label ) . '</span></th>';
+				}
+
+				echo '<td>';
+					echo '<code>' . esc_html( $hook['hook'] ) . '</code>';
+
+					if ( 1 < $hook['count'] ) {
+						echo '<br /><span class="qm-info qm-supplemental">Fired ' . esc_html( $hook['count'] ) . ' times</span>';
+					}
+				echo '</td>';
+				echo '<td>' . ( $hook['is_action'] ? 'Action' : 'Filter' ) . '</td>';
+				echo '</tr>';
+			}
+		}
+
+		echo '</tbody>';
+		echo '</table></div>';
+
+		echo '</div>';
+	}
+
 }
 
 function register_qm_output_html_hooks( array $output, QM_Collectors $collectors ) {