Add file system implementation stub

source/app.d

@@ -8,6 +8,7 @@ import dfuse.fuse;
 
 import dtagfs.filesystem;
 import dtagfs.tagprovider;
+import dtagfs.dublincore;
 
 void main(string[] args)
 {
@@ -22,7 +23,7 @@ void main(string[] args)
 	auto source = args[1];
 	auto mountPoint = args[2];
 
-	TagProvider[] tagProviders;
+	TagProvider[] tagProviders = [new DublinCoreTagProvider()];
 
 	string[] mountOptions;
 	bool fork;

source/filesystem.d

@@ -1,13 +1,65 @@
 module dtagfs.filesystem;
 
+import std.algorithm;
+import std.range;
+import std.file;
+import std.conv;
+
 import dfuse.fuse;
 
 import dtagfs.tagprovider;
 
 class FileSystem : Operations
 {
+	private string _source;
+	private TagProvider[] _tagProviders;
+
+	private string[][string] _tagCache;
+
 	this(string source, TagProvider[] tagProviders)
 	{
+		_source = source;
+		_tagProviders = tagProviders;
 
+		cacheTags();
+	}
+
+	@property
+	TagProvider primaryTagProvider()
+	{
+		return _tagProviders[0];
+	}
+
+	void cacheTags()
+	{
+		foreach(tagProvider; _tagProviders.filter!(a => a.cacheReads))
+		{
+			foreach(file; dirEntries(_source, SpanMode.breadth).filter!(a => a.isFile))
+			{
+				_tagCache[file] ~= tagProvider.getTags(file);
+			}
+		}
+	}
+
+	override void getattr(const(char)[] path, ref stat_t stat)
+	{
+		if(path == "/")
+		{
+			stat.st_mode = S_IFDIR | octal!755;
+			stat.st_size = 0;
+			return;
+		}
+
+		throw new FuseException(errno.ENOENT);
+	}
+
+	override string[] readdir(const(char)[] path)
+	{
+		return _tagCache.byValue()
+			.joiner
+			.array
+			.sort()
+			.uniq
+			.array;
 	}
 }