Playlist: Add a workaround for AppleStript URLs

AppleScript is apparently such a legacy system, that when it sends URLs
to your app to open, they're in the old Carbon format. So we need to
translate these to proper URL strings for the rest of the app to deal
with them at all.

The format of these URLs is as follows:

/method/::

Followed optionally by:

username/password@

Where the slash and password are optional.

Followed by:

hostname

Followed optionally by:

/portnumber

And finally, followed by:

:path:on:server:filename.ext

So, in hostname field, we must swap slashes to colons. And in the path
field, swap colons to slashes. What a bizarre world.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>

Application/AppController.m

@@ -496,7 +496,37 @@ - (void)application:(NSApplication *)theApplication openFiles:(NSArray *)filenam
 	NSMutableArray *urls = [NSMutableArray array];
 
 	for(NSString *filename in filenames) {
-		[urls addObject:[NSURL fileURLWithPath:filename]];
+		NSURL *url = nil;
+		if([[NSFileManager defaultManager] fileExistsAtPath:filename]) {
+			url = [NSURL fileURLWithPath:filename];
+		} else {
+			if([filename hasPrefix:@"/http/::"] ||
+			   [filename hasPrefix:@"/https/::"]) {
+				// Stupid Carbon bodge for AppleScript
+				NSString *method = nil;
+				NSString *server = nil;
+				NSString *path = nil;
+
+				NSScanner *objScanner = [NSScanner scannerWithString:filename];
+
+				if(![objScanner scanString:@"/" intoString:nil] ||
+				   ![objScanner scanUpToString:@"/" intoString:&method] ||
+				   ![objScanner scanString:@"/::" intoString:nil] ||
+				   ![objScanner scanUpToString:@":" intoString:&server] ||
+				   ![objScanner scanString:@":" intoString:nil]) {
+					continue;
+				}
+				[objScanner scanUpToCharactersFromSet:[NSCharacterSet illegalCharacterSet] intoString:&path];
+				// Colons in server were converted to shashes, convert back
+				NSString *convertedServer = [server stringByReplacingOccurrencesOfString:@"/" withString:@":"];
+				// Slashes in path were converted to colons, convert back
+				NSString *convertedPath = [path stringByReplacingOccurrencesOfString:@":" withString:@"/"];
+				url = [NSURL URLWithString:[NSString stringWithFormat:@"%@://%@/%@", method, convertedServer, convertedPath]];
+			}
+		}
+		if(url) {
+			[urls addObject:url];
+		}
 	}
 
 	NSDictionary *loadEntriesData = @{ @"entries": urls,