From 6bbdf29d6cc28d4080f1c29352ff38539549c856 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@sbcglobal.net>
Date: Sat, 21 May 2016 15:05:01 -0400
Subject: tidy path handling

---
 index.php | 48 +++++++++++++++++++++++++++---------------------
 1 file changed, 27 insertions(+), 21 deletions(-)

diff --git a/index.php b/index.php
index 30813cd..633944c 100644
--- a/index.php
+++ b/index.php
@@ -1,5 +1,5 @@
 <?php
-# Copyright © 2014 Luke Shumaker <lukeshu@sbcglobal.net>
+# Copyright © 2014, 2016 Luke Shumaker <lukeshu@sbcglobal.net>
 # This work is free. You can redistribute it and/or modify it under the
 # terms of the Do What The Fuck You Want To Public License, Version 2,
 # as published by Sam Hocevar. See the ./COPYING file for more details.
@@ -33,16 +33,20 @@ function show_404() {
 <?php
 }
 
-function is_root($root, $dirname) {
-	$path = $root.'/'.$dirname;
-
-	$parts = preg_split("|/+|", $root, -1, PREG_SPLIT_NO_EMPTY);
-	$root = implode('/', $parts);
+function normalizeN($filename) {
+	$parts = preg_split("|/+|", $filename, -1, PREG_SPLIT_NO_EMPTY);
+	$abs = substr($filename, 0, 1) === '/';
+	return array(($abs?'/':'').implode('/', $parts), count($parts));
+}
 
-	$parts = preg_split("|/+|", $path, -1, PREG_SPLIT_NO_EMPTY);
-	$path = implode('/', $parts);
+function normalize($filename) {
+	list ($new_filename, $n) = normalizeN($filename);
+	return $new_filename;
+}
 
-	return ($path === $root);
+function is_root($root, $dirname) {
+	$path = $root.'/'.$dirname;
+	return (normalize($path) === normalize($root));
 }
 
 function classify($root, $dirname, $filename) {
@@ -51,13 +55,14 @@ function classify($root, $dirname, $filename) {
 	if ($filename === '.') { return [ 'dir' ]; }
 	if ($filename === '..') { return [ 'dir', 'parent' ]; }
 
-	$parts = preg_split("|/+|", $dirname, -1, PREG_SPLIT_NO_EMPTY);
-	$dirname = implode('/', $parts);
+	list ($dirname, $parts) = normalizeN($dirname);
+	$dirpath = normalize($root.'/'.$dirname);
+	$filepath = normalize($dirpath.'/'.$filename);
 
 	$classes = array();
-	if (count($parts) == 0) {
+	if ($parts == 0) {
 		// in the top-level
-		if (is_dir($root.'/'.$dirname.'/'.$filename.'/os')) {
+		if (is_dir($filepath) && is_dir($filepath.'/os')) {
 			array_push($classes, 'repo');
 			if (in_array($filename, $repos_arch_project  )) { array_push($classes, 'arch'); }
 			if (in_array($filename, $repos_para_project  )) { array_push($classes, 'para'); }
@@ -73,9 +78,9 @@ function classify($root, $dirname, $filename) {
 		}
 	}
 	if ($filename[0] === '.' || substr($filename, -1) === '~') { $classes[] = 'hidden'; }
-	if (is_link($root.'/'.$dirname.'/'.$filename)) { $classes[] = 'link'; }
-	if (is_dir( $root.'/'.$dirname.'/'.$filename)) { $classes[] = 'dir';  }
-	if (is_file($root.'/'.$dirname.'/'.$filename)) { $classes[] = 'file'; }
+	if (is_link($filepath)) { $classes[] = 'link'; }
+	if (is_dir( $filepath)) { $classes[] = 'dir';  }
+	if (is_file($filepath)) { $classes[] = 'file'; }
 
 	if (preg_match("/\.pkg\.tar(\..z)?$/" , $filename) == 1) { $classes[] = 'pkg'; }
 	if (preg_match("/\.tar(\..z|\.bz2)?$/", $filename) == 1) { $classes[] = 'tar'; }
@@ -145,10 +150,11 @@ if (!is_dir($root.'/'.$dirname)) {
 						foreach ($filenames as $filename) {
 							if ($filename === '.') { continue; }
 							if ($filename === '..' && is_root($root,$dirname)) { continue; }
+							$filepath = normalize($root.'/'.$dirname.'/'.$filename);
 							$classes = classify($root, $dirname, $filename);
 							echo "\t\t\t\t<tr class=\"".implode(' ', $classes)."\">";
-							if (is_link($root.'/'.$dirname.'/'.$filename)) {
-								echo "<td><a href=\"".htmlentities($filename)."\">".htmlentities($filename)."</a> -> ".htmlentities(readlink($root.'/'.$dirname.'/'.$filename))."</td>";
+							if (is_link($filepath)) {
+								echo "<td><a href=\"".htmlentities($filename)."\">".htmlentities($filename)."</a> -> ".htmlentities(readlink($filepath))."</td>";
 							} else {
 								echo "<td><a href=\"".htmlentities($filename)."\">".htmlentities($filename)."</a></td>";
 							}
@@ -156,11 +162,11 @@ if (!is_dir($root.'/'.$dirname)) {
 							if ($filename == '..') {
 								echo '<td></td><td></td>';
 							} else {
-								echo "<td>".date("Y-m-d H:i", filemtime($root.'/'.$dirname.'/'.$filename))."</td>";
-								if (is_dir($root.'/'.$dirname.'/'.$filename)) {
+								echo "<td>".date("Y-m-d H:i", filemtime($filepath))."</td>";
+								if (is_dir($filepath)) {
 									echo "<td class=number>-</td>";
 								} else {
-									echo "<td class=number>".filesize($root.'/'.$dirname.'/'.$filename)."</td>";
+									echo "<td class=number>".filesize($filepath)."</td>";
 								}
 								echo "</tr>\n";
 							}
-- 
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