WordPress Routes

wp-routes.php

<?php
function bt_register_routes( $routes ) {
    foreach ( $routes as $route_name => $args ) {
        bt_register_route( $route_name, $args );
    }
}

function bt_register_route( $route_name, $args = array() ) {
    $args = wp_parse_args( $args, array(
        'query_var' => 'route_' . $route_name,
        'rewrite_rules' => array(),
        'template_path' => str_replace( '_', '-', $route_name ) . '.php',
        'title' => ucwords( str_replace( '_', ' ', $route_name ) ),
        'body_class' => '',
        'parse_query_func' => false,
    ) );
    
    BT_Routes::$routes[$route_name] = $args;
}

class BT_Routes {
    public static $routes = array();
    
    function init() {
        add_filter( 'generate_rewrite_rules', array( __CLASS__, 'add_rewrite_rules' ) );
        add_filter( 'query_vars', array( __CLASS__, 'query_vars' ) );
        add_filter( 'parse_query', array( __CLASS__, 'parse_query' ), 10, 2);
        add_filter( 'template_include', array( __CLASS__, 'template_include' ) );
        add_filter( 'body_class', array( __CLASS__, 'body_classes' ) );
        add_filter( 'wp_title', array( __CLASS__, 'wp_title' ), null, 3 );

        add_action( 'posts_selection', array( __CLASS__, 'context_fixer' ) );
    }
    
    function current() {
        global $wp_query;
        foreach ( self::$routes as $args ) {
            if ( $wp_query->get( $args['query_var'] ) ) return $args;
        }
        return false;
    }
    
    function parse_query( $query ) {
        if ( !$current = self::current() ) return $query;
        
        if ( is_callable( $current['parse_query_func'] ) ) {
            call_user_func( $current['parse_query_func'] );
        }
    }
    
    function wp_title( $title, $sep, $seplocation ) {
        if ( !$current = self::current() ) return $title;
        return $current['title'] . ' ' . $title;
    }
    
    function context_fixer() {
        if ( !$current = self::current() ) return;
        global $wp_query;
        $wp_query->is_home = false;
    }

    function template_include( $template ) {
        if ( !$current = self::current() ) return $template;

        return locate_template( array(
            $current['template_path'] . '.php',
            'index.php'
        ));
    }

    function body_classes( $c ) {
        if ( !$current = self::current() || !$current['body_class'] ) return $c;
        
        $c[] = $current['body_class'];
        return $c;
    }

    function query_vars( $query_vars ) {
        foreach ( self::$routes as $args ) {
            $query_vars[] = $args['query_var'];
        }
        return $query_vars;
    }

    function add_rewrite_rules( $wp_rewrite ) {
        $new_rules = array();
        
        foreach ( self::$routes as $args ) {
            foreach ( $args['rewrite_rules'] as $pattern => $match_vars ) {
                if ( is_int( $pattern ) ) {
                    $pattern = $match_vars;
                    $match_vars = '';
                }
                if ( $match_vars ) $match_vars = '&' . $match_vars;
                $new_rules[$pattern . '/?$'] = 'index.php?' . $args['query_var'] . '=1' . $match_vars;
            }
        }

        //print_r($new_rules);
        $wp_rewrite->rules = array_merge( $new_rules, $wp_rewrite->rules );
        //print_r($wp_rewrite->rules);
        return $wp_rewrite;
    }
}

BT_Routes::init();

// Example - http://somedomain.com/edit-profile/
bt_register_route( 'edit_profile', array(
    'rewrite_rules' => array( 'edit-profile' ),
    'template_path' => 'edit-profile'
) );