functions.php

<?php

function get_posts($dir,$files = array()) {

    if(empty($files)) $files = array_diff(scandir($dir), array('..', '.'));
    $posts = array();

    foreach ($files as $entry) {

        $parts = explode('.', $entry);

        if($parts[1] == 'md') {

            $post = new Post;

            if($dir == CONTENT_DIR) $post->isPage = false;
            else $post->isPage = true;

            if(file_exists($dir.$entry)) {

                $content = array();
                $file = file_get_contents($dir.$entry);

                $headers = array(
                    'title'     => 'Title'
                    // eventually one can add more fields, for istance:
                    //'date'      => 'Date'
                );


                foreach ($headers as $field => $regex){
                    if (preg_match('/^[ \t\/*#@]*' . preg_quote($regex, '/') . ':(.*)$/mi', $file, $match) && $match[1]) {
                        $content[ $field ] = trim(preg_replace("/\s*(?:\*\/|\?>).*/", '', $match[1]));
                    } else {
                        $content[ $field ] = '';
                    }
                }


                $content['body'] = preg_replace('#/\*.+?\*/#s', '', $file); // Remove comments and meta

                /* New post creation */

                // file and title
                $post->file =  str_replace('.md','',$entry);
                $post->title = $content['title'];

                // only a blog entry has a date
                if(!$post->isPage) {
                    // date
                    $format = 'Y-m-d-H:i'; // 2015-01-01-18:00
                    // firstly I will try with hour and minute, if it fails, try only with Y-m-d
                    if(($date = date_create_from_format($format, $post->file)) == false) {
                        $format = 'Y-m-d';
                        $date = date_create_from_format($format, $post->file);
                    }
                    $post->date = $date;
                }

                //body
                $post->body = $content['body'];

                array_push($posts, $post);

                // compare files dates and order from last to first
                usort($posts, function($a, $b) {
                    return $a->date < $b->date;
                });

            } else {
                // not found, nearly impossible
                $post->title = "404: Not found";
                $post->date = NULL;
                $post->body = NULL;
                array_push($posts, $post);
            }
        }
    }

    return $posts;
}

function list_archive() {

    $files = array_diff(scandir(CONTENT_DIR), array('..', '.'));
    $archive = array();

    foreach ($files as $entry) {

        $parts = explode('.', $entry);

        if($parts[1] == 'md') {

            if(file_exists(CONTENT_DIR.$entry)) {

                // date
                $format = 'Y-m-d-H:i'; // 2015-01-01-18:00
                $entry = str_replace('.md','',$entry);

                // firstly I will try with hour and minute, if it fails, try only with Y-m-d
                if(!($date = date_create_from_format($format, $entry))) {
                    $format = 'Y-m-d';
                    $date = date_create_from_format($format, $entry);
                }

                if($date) {
                    $label = $date->format("F Y");
                    array_push($archive,$label);
                }
            }
        }
    }
    // ok, so delete duplicates and reverse order (we want nearest months first)
    return array_unique(array_reverse($archive));
}

function get_archive($month) {
    // $month is a label in format F Y
    $format = 'F Y';
    $date = date_create_from_format($format, $month);

    $yearNumber  = $date->format('Y');
    $monthNumber = $date->format('m');


    $files = array_diff(scandir(CONTENT_DIR), array('..', '.'));
    $filter = $yearNumber."-".$monthNumber;

    $filteredFiles = array_filter($files, function ($v) use($filter) {
        return substr($v, 0, 7) == $filter;
    });

    return get_posts(CONTENT_DIR,$filteredFiles);
}

function get_single_post($dir,$entry) {

    $entry = $entry.".md";
    $files = array();
    array_push($files,$entry);

    return get_posts($dir,$files);
}

function get_page_posts($initial) {

    $files = array_diff(scandir(CONTENT_DIR), array('..', '.'));
    // reverse order
    rsort($files);
    $page = array_slice($files, $initial, POST_PER_PAGE);

    return get_posts(CONTENT_DIR,$page);
}


function post_count() {
    $files = array_diff(scandir(CONTENT_DIR), array('..', '.'));
    return count($files);
}

function get_pages_list() {

    $files = array_diff(scandir(PAGES_DIR), array('..', '.'));
    $files = array_map(function ($entry) { return  str_replace('.md','',$entry); }, $files);
    return $files;
}

?>