Adding copy_contents functions.

src/owlpath.vala

@@ -43,6 +43,30 @@ namespace Owl {
 			GLib.FileUtils.set_contents (this.get_path (), content);
 		}
 
+		public void copy_contents (Owl.Path destination) throws GLib.Error {
+			if (!this.is_dir ()) {
+				GLib.critical ("Destination is not a directory at copy_contents.\n");
+				return;
+			}
+			if (!destination.exists ()) {
+				destination.mkpath ();
+			}
+			this.visit (true, (inner_file) => {
+				try {
+					if (!inner_file.is_dir ()) {
+						var dest_file = destination.child(this.get_relative(inner_file));
+						dest_file.parent ().mkpath ();
+						inner_file.file.copy (dest_file.file, GLib.FileCopyFlags.OVERWRITE);
+
+					}
+				} catch (GLib.Error error) {
+					GLib.critical (error.message);
+					return false;
+				}
+				return true;
+			});
+		}
+
 		public string slurp () throws GLib.Error {
 			string output;
 			GLib.FileUtils.get_contents (this.get_path (), out output);
@@ -62,6 +86,10 @@ namespace Owl {
 			return new Owl.Path (child_file);
 		}
 
+		public string? get_relative (Owl.Path descendant) {
+			return this.file.get_relative_path (descendant.file);
+		}
+
 		public void mkpath () throws GLib.Error {
 			this.file.make_directory_with_parents ();
 		}

test/00-owlpath.test.vala

@@ -66,5 +66,42 @@ int main (string[] args) {
 			GLib.Test.fail_printf ("%s\n", error.message);
 		}
 	});
+	GLib.Test.add_func ("/test/owl/path-get-relative", () => {
+		try {
+			var tmp = new Owl.Path.tempdir ();
+			var c = tmp.child (@"a$(S)b$(S)c");
+			var a = c.parent ().parent ();
+			assert (a.get_relative(c) == @"b$(S)c");
+		} catch (GLib.Error error) {
+			GLib.Test.fail_printf ("%s\n", error.message);
+		}
+	});
+	GLib.Test.add_func ("/test/owl/path-copy-contents", () => {
+		try {
+			string char_list = "abcde";
+			var tmp = new Owl.Path.tempdir ();
+			var source = tmp.child ("source");
+			var dest = tmp.child ("dest");
+			for (long i = 0; i<char_list.length; i++) {
+				char character = char_list[i];
+				var char_path = source.child (character.to_string ());
+				char_path.mkpath ();
+				var plain_file = char_path.child (character.to_string ());
+				plain_file.spew ("hola mundo");
+			}
+			source.copy_contents (dest);
+			int i = 0;
+			dest.visit (true, (file) => {
+				if (!file.is_dir () && file.slurp () == "hola mundo") {
+					i++;
+				}
+				return true;
+			});
+			assert (i == 5);
+		} catch (GLib.Error error) {
+			GLib.Test.fail_printf ("%s\n", error.message);
+		}
+	});
+
 	return GLib.Test.run ();
 }