[Clipboard] Add textual data to clipboard on copy

The copy action now includes formatted text of the selected entries when
copying, in addition to the supported file and URL types.

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

Playlist/PlaylistEntry.h

@@ -20,6 +20,7 @@
 + (NSSet *_Nonnull)keyPathsForValuesAffectingStatus;
 + (NSSet *_Nonnull)keyPathsForValuesAffectingStatusMessage;
 + (NSSet *_Nonnull)keyPathsForValuesAffectingSpam;
++ (NSSet *_Nonnull)keyPathsForValuesAffectingIndexedSpam;
 + (NSSet *_Nonnull)keyPathsForValuesAffectingAlbumArt;
 + (NSSet *_Nonnull)keyPathsForValuesAffectingTrackText;
 + (NSSet *_Nonnull)keyPathsForValuesAffectingLengthText;
@@ -33,6 +34,7 @@
 @property(nonatomic, readonly) NSString *_Nonnull filename;
 
 @property(nonatomic, readonly) NSString *_Nonnull spam;
+@property(nonatomic, readonly) NSString *_Nonnull indexedSpam;
 
 @property(nonatomic, readonly) NSString *_Nonnull positionText;
 

Playlist/PlaylistEntry.m

@@ -63,6 +63,10 @@ extern NSMutableDictionary<NSString *, AlbumArtwork *> *__artworkDictionary;
 	return [NSSet setWithObjects:@"albumartist", @"artist", @"rawTitle", @"album", @"track", @"disc", @"totalFrames", @"currentPosition", @"bitrate", nil];
 }
 
++ (NSSet *)keyPathsForValuesAffectingIndexedSpam {
+	return [NSSet setWithObjects:@"albumartist", @"artist", @"rawTitle", @"album", @"track", @"disc", @"totalFrames", @"currentPosition", @"bitrate", @"index", nil];
+}
+
 + (NSSet *)keyPathsForValuesAffectingTrackText {
 	return [NSSet setWithObjects:@"track", @"disc", nil];
 }
@@ -121,6 +125,11 @@ extern NSMutableDictionary<NSString *, AlbumArtwork *> *__artworkDictionary;
 	}
 }
 
+@dynamic indexedSpam;
+- (NSString *)indexedSpam {
+	return [NSString stringWithFormat:@"%llu. %@", self.index, self.spam];
+}
+
 @dynamic spam;
 - (NSString *)spam {
 	BOOL hasBitrate = (self.bitrate != 0);

Playlist/PlaylistView.m

@@ -220,10 +220,15 @@
 	NSUInteger capacity = [entries count];
 	NSMutableArray *selectedURLs = [NSMutableArray arrayWithCapacity:capacity];
 
+	NSMutableArray *fileSpams = [NSMutableArray array];
+
 	for(PlaylistEntry *pe in entries) {
 		[selectedURLs addObject:pe.url];
+		[fileSpams addObject:pe.indexedSpam];
 	}
 
+	[pboard writeObjects:@[[fileSpams componentsJoinedByString:@"\n"]]];
+
 	NSError *error;
 	NSData *data;
 	if(@available(macOS 10.13, *)) {