Implement basic Dublin Core tag provider

source/tagprovider.d

@@ -1,6 +1,9 @@
 module dtagfs.tagprovider;
 
-class TagProvider
+interface TagProvider
 {
+	string[] getTags(string path);
 
+	@property
+	bool cacheReads();
 }

source/tagproviders/dublincore.d

@@ -0,0 +1,56 @@
+module dtagfs.dublincore;
+
+import std.process;
+import std.string;
+import std.algorithm;
+import std.array;
+
+import dtagfs.tagprovider;
+
+class DublinCoreTagProvider : TagProvider
+{
+	override string[] getTags(string path)
+	{
+		//TODO: Make prefixes configurable
+
+		string[] tags;
+
+		std.stdio.writeln(path);
+
+		tags ~= map!(a => a)(getElementData!"Subject"(path)).array;
+		tags ~= map!(a => "copyright:" ~ a)(getElementData!"Rights"(path)).array;
+		tags ~= map!(a => "relation:" ~ a)(getElementData!"Relation"(path)).array;
+		tags ~= map!(a => "type:" ~ a)(getElementData!"Type"(path)).array;
+
+		return tags;
+	}
+
+	string[] getElementData(string element)(string path)
+	{
+		//TODO: Use a proper metadata library instead of exiftool
+
+		auto exiftool = execute(["exiftool", "-b", "-" ~ element, path]);
+		auto rawData = exiftool.output;
+
+		string[] data;
+		foreach(line; splitLines(rawData))
+		{
+			if(indexOf(line, ' ') == -1)
+			{
+				data ~= line;
+			}
+			else
+			{
+				data ~= '"' ~ line ~ '"';
+			}
+		}
+
+		return data;
+	}
+
+	@property
+	override bool cacheReads()
+	{
+		return true;
+	}
+}