One Quickie

Finding the span of a paragraph (NSTextView->General)
The NSString paragraphRangeForRange: method gives you the span of a paragraph. If you're using the text architecture, you need to get the string from the text storage. This chunklet shows the paragraph span for the current selection:
    NSRange selectedRange = [textview selectedRange];
    NSTextStorage *storage = [textview textStorage];
    effectiveRange = [[storage string] paragraphRangeForRange: selectedRange];

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Advanced Mac OS X Programming book