From 9eb9e9c01ace6e004a7db324ed6814e1c407cb6a Mon Sep 17 00:00:00 2001
From: mossroy <mossroy@free.fr>
Date: Sat, 1 Jun 2013 20:45:26 +0200
Subject: [PATCH] Implement scanning of sdcard content, in order to find the
 archives on it

---
 www/index.html         |  4 ++--
 www/js/app.js          | 18 +++++++++++++-----
 www/js/lib/evopedia.js | 41 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+), 7 deletions(-)

diff --git a/www/index.html b/www/index.html
index 19fefe12..93b379cd 100644
--- a/www/index.html
+++ b/www/index.html
@@ -55,8 +55,8 @@ License:
 	<br />
 	<ul>
 	<li>On desktops, it works on recent Firefox and Chrome, and maybe on other browsers</li>
-	<li>On the Firefos OS simulator, you have (for now) to put the French dump files in a "fake-sdcard/evopedia" folder of your firefox profile (ex : ~/.mozilla/firefox/xxxx.default/extensions/r2d2b2g@mozilla.org/profile/fake-sdcard). It looks for evopedia/wikipedia_fr_2013-02-16/titles.idx in it. You also need to install the application from the dashboard of the simulator instead of accessing via the browser (due to security restrictions in Firefox OS : only certified webapps can access the sdcard)</li>
-	<li>On a real Firefox OS device, you also have (for now) to put the French dump files in an "evopedia" directory at the root of your sdcard, so that it finds a file /evopedia/wikipedia_fr_2013-02-16/titles.idx on it</li>
+	<li>On the Firefos OS simulator, you have to put the archive files in a "fake-sdcard/evopedia" folder of your firefox profile (ex : ~/.mozilla/firefox/xxxx.default/extensions/r2d2b2g@mozilla.org/profile/fake-sdcard). It looks for evopedia/*/titles.idx in it. You also need to install the application from the dashboard of the simulator instead of accessing via the browser (due to security restrictions in Firefox OS : only certified webapps can access the sdcard)</li>
+	<li>On a real Firefox OS device, you also have to put the archive files in an "evopedia" directory at the root of your sdcard, so that it finds a file /evopedia/*/titles.idx on it</li>
 	</ul>
 	<br />
 	It's only a proof of concept so far : there are many many ways this could be enhanced (suggestions and patches are welcome : the source code is on <a href="https://github.com/mossroy/evopedia-html5">github</a>). In particular :
diff --git a/www/js/app.js b/www/js/app.js
index 8d383ebb..e5848f44 100644
--- a/www/js/app.js
+++ b/www/js/app.js
@@ -49,13 +49,12 @@ define(function(require) {
     }
     
     if (storage != null) {
-    	//var directory = 'evopedia/wikipedia_small_2010-08-14';
-    	var directory = 'evopedia/wikipedia_fr_2013-02-16';
-    	localArchive = new evopedia.LocalArchive();
-    	localArchive.readTitleFile(storage, directory);
-    	localArchive.readDataFiles(storage, directory, 0);
+    	// If DeviceStorage is available, we look for archives in it
+    	var directory = 'evopedia';
+    	evopedia.LocalArchive.scanForArchives(storage,directory,selectFirstArchive);
     }
     else {
+    	// If DeviceStorage is not available, we display the file select components
     	displayFileSelect();
     	setLocalArchiveFromFileSelect();
     }
@@ -65,6 +64,15 @@ define(function(require) {
     	var titleName = event.state.titleName;
     	goToArticle(titleName);
     };
+    
+    /**
+     * Selects the first archive found on device storage
+     */
+    function selectFirstArchive(archiveDirectories) {
+    	localArchive = new evopedia.LocalArchive();
+    	localArchive.readTitleFile(storage, archiveDirectories[0]);
+    	localArchive.readDataFiles(storage, archiveDirectories[0], 0);
+    }
 
     /**
 	 * Displays the zone to select files from the dump
diff --git a/www/js/lib/evopedia.js b/www/js/lib/evopedia.js
index c59a1793..4b133cfb 100644
--- a/www/js/lib/evopedia.js
+++ b/www/js/lib/evopedia.js
@@ -419,6 +419,47 @@ define(function(require) {
 		reader.readAsArrayBuffer(blob);
 	};
 	
+	/**
+	 *  Scans the DeviceStorage for archives
+	 * 
+	 * @param storage DeviceStorage instance
+	 * @param rootDirectory Directory from which to start scanning
+	 * @param callbackFunction Function to call with the list of directories where archives are found
+	 */
+	LocalArchive.scanForArchives = function(storage, rootDirectory, callbackFunction) {
+		var directories = [];
+		var cursor = storage.enumerate();
+		cursor.onerror = function() {
+			alert("Error scanning directory " + rootDirectory + " : " + cursor.error);
+		}
+		cursor.onsuccess = function() {
+			if (cursor.result) {
+				var file = cursor.result;
+				var fileName = file.name;
+				
+				// We look for files "titles.idx"
+				if (!endsWith(fileName,"titles.idx")) {
+					cursor.continue();
+					return;
+				}
+			
+				// We want to return the directory where titles.idx is stored
+				var directory = fileName.substring(0, fileName.lastIndexOf('/'));
+				console.log(directory);
+				directories.push(directory);
+				cursor.continue();
+			}
+			else {
+				callbackFunction(directories);
+			}
+		};
+	};
+
+	function endsWith(str, suffix) {
+		return str.indexOf(suffix, str.length - suffix.length) !== -1;
+	}
+
+	
 	
 	/**
 	 * Title class : defines the title of an article and some methods to manipulate it