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- def truncate(text, length, ellipsis='...'):
- """Truncate `text` to `length`, add `ellipsis` if needed."""
- if text is None:
- text = ''
- if not isinstance(text, basestring):
- raise ValueError("%r is no instance of basestring or None" % text)
- # thread other whitespaces as word break
- content = text.replace('\r', ' ').replace('\n', ' ').replace('\t', ' ')
- # make sure to have at least one space for finding spaces later on
- content += ' '
- if len(content) > length:
- # find the next space after max_len chars (do not break inside a word)
- pos = length + content[length:].find(' ')
- if pos != (len(content) - 1):
- # if the found whitespace is not the last one add an ellipsis
- text = text[:pos].strip() + ' ' + ellipsis
- return text
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