gistfile1.m

- (void)reloadLineIndexes {
	
	NSString *diffString = [[self textStorage] string];
	
	if (diffString.length < 1) {
		self.highestNewFileLineNumber = 0;
		self.lineIndexes = nil;
		return;
	}
	
	NSLayoutManager *layoutManager = [self layoutManager];
	NSTextContainer *textContainer = [self textContainer];
	NSRect textRect = [layoutManager boundingRectForGlyphRange:NSMakeRange(0, NSUIntegerMax) inTextContainer:textContainer];
	
	NSString *currentLine = nil;
	NSUInteger currentIndex = 0;
	NSUInteger newFileLineIndex = 0;
	BOOL isContinuation = NO;
	
	NSRect lineBoundingRect = self.frame;
	lineBoundingRect.size.height = kTextBoundingRectHeight;
	
	NSMutableArray *mutableLineIndexes = [NSMutableArray arrayWithCapacity:(textRect.size.height / kTextBoundingRectHeight)];
	
	while (currentIndex * kTextBoundingRectHeight < NSMaxY(textRect)) {
		
		NSRange glyphRange = [layoutManager glyphRangeForBoundingRect:lineBoundingRect inTextContainer:textContainer];		
		NSRange characterRange = [layoutManager characterRangeForGlyphRange:glyphRange actualGlyphRange:NULL];
		
		GHDiffLineIndexSet *lineIndexSet = [GHDiffLineIndexSet lineIndexSet];
		lineIndexSet.textAttributes = self.lineNumberTextAttributes;
		
		currentLine = [diffString substringWithRange:characterRange];
		
		if ([currentLine isFileMarker]) {
			lineIndexSet.lineType = GHDiffLineTypeFileMarker;
		}
		
		else if ([currentLine isChangeSetMarker]) {
			newFileLineIndex = [currentLine newFileChangeSetMarkerIndex] - 1;
			lineIndexSet.newFileLineIndex = newFileLineIndex;
			lineIndexSet.lineType = GHDiffLineTypeChangeSetMarker;
		}
		
		else if ([currentLine isAddition]) {
			newFileLineIndex ++;
			lineIndexSet.newFileLineIndex = newFileLineIndex;
			lineIndexSet.lineType = GHDiffLineTypeAddition;
		}
		
		else if ([currentLine isDeletion]) {
			lineIndexSet.lineType = GHDiffLineTypeDeletion;
		}
		
		else if (isContinuation) {
			lineIndexSet.lineType = GHDiffLineTypeContinuation;
		}
		
		else {			
			newFileLineIndex ++;
			lineIndexSet.newFileLineIndex = newFileLineIndex;
			lineIndexSet.lineType = GHDiffLineTypePreExistingLine;
		}
		
		if (newFileLineIndex != NSUIntegerMax && newFileLineIndex > self.highestNewFileLineNumber) {
			
			self.highestNewFileLineNumber = newFileLineIndex;
		}
		
		currentIndex ++;
		lineIndexSet.realLineIndex = currentIndex;
		lineIndexSet.lineRect = lineBoundingRect;
		isContinuation = [currentLine hasNewlineTerminator] ? NO : YES;
		lineIndexSet.hasNewlineTerminator = isContinuation;
		
		[mutableLineIndexes addObject:lineIndexSet];
		lineBoundingRect.origin.y += kTextBoundingRectHeight;
	}
	
	self.lineIndexes = mutableLineIndexes;
}