<?php

require_once 'lib_cache.php';

# Create the list of blog posts
function blog_crawl($force = false, $dir = '') {
	$posts = cache_get('blog_crawl');
	if (!$posts || $force) {
		$base = $GLOBALS['smarty']->template_dir;
		$files = scandir("$base$dir");
		$paths = array();
		$ii = sizeof($files);
		for ($i = 0; $i < $ii; ++$i) {
			if (preg_match('!^\.!', $files[$i])) {
				unset($files[$i]);
			} else {
				$paths[] = array(
					'rel' => "$dir/{$files[$i]}",
					'abs' => "$base$dir/{$files[$i]}"
				);
			}
		}
		usort($paths, '_blog_crawl_mtime_sort');
		$posts = array();
		$ii = sizeof($paths);
		for ($i = 0; $i < $ii; ++$i) {
			if (is_dir($paths[$i]['abs'])) {
				$sub = blog_crawl($force, $paths[$i]['rel']);
				foreach ($sub as $s) {
					$posts[] = $s;
				}
			} else if (preg_match('!^/[0-9]{4}/[0-9]{2}/[0-9]{2}!',
				$paths[$i]['rel'])) {
				$posts[] = $paths[$i]['rel'];
			}
		}
		cache_set('blog_crawl', $posts);
	}
	return $posts;
}

# Callback function for sorting by file modified time
function _blog_crawl_mtime_sort($a, $b) {
	$a_mtime = filemtime($a['abs']);
	$b_mtime = filemtime($b['abs']);
	if ($a_mtime == $b_mtime) return 0;
	return $a > $b ? -1 : 1;
}

# Return an array of months with posts
function blog_months_with_posts() {
	$dates = cache_get('blog_months_with_posts');
	if (!$dates) {
		$base = $GLOBALS['smarty']->template_dir;
		$years = scandir($base);
		$dates = array();
		foreach ($years as $y) {
			if (preg_match('!^[0-9]{4}$!', $y)) {
				$months = scandir("$base/$y");
				foreach ($months as $m) {
					if (preg_match('!^[0-9]{2}$!', $m)) {
						$dates[] = strtotime("$y-$m-01");
					}
				}
			}
		}
		sort($dates, SORT_NUMERIC);
		$dates= array_reverse($dates);
		cache_set('blog_months_with_posts', $dates);
	}
	return $dates;
}

# Filter posts list by date
function blog_date_archive($regex) {
	global $smarty;
	$posts = blog_crawl();
	$out = array();
	foreach ($posts as $p) {
		if (preg_match($regex, $p)) {
			$out[] = $p;
		}
	}
	$smarty->assign('posts', $out);
	$smarty->display('.posts.html');
}

?>