1#!/usr/bin/env python3 2## 3## Copyright (c) 2016, Alliance for Open Media. All rights reserved. 4## 5## This source code is subject to the terms of the BSD 2 Clause License and 6## the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 7## was not distributed with this source code in the LICENSE file, you can 8## obtain it at www.aomedia.org/license/software. If the Alliance for Open 9## Media Patent License 1.0 was not distributed with this source code in the 10## PATENTS file, you can obtain it at www.aomedia.org/license/patent. 11## 12"""Wraps paragraphs of text, preserving manual formatting 13 14This is like fold(1), but has the special convention of not modifying lines 15that start with whitespace. This allows you to intersperse blocks with 16special formatting, like code blocks, with written prose. The prose will 17be wordwrapped, and the manual formatting will be preserved. 18 19 * This won't handle the case of a bulleted (or ordered) list specially, so 20 manual wrapping must be done. 21 22Occasionally it's useful to put something with explicit formatting that 23doesn't look at all like a block of text inline. 24 25 indicator = has_leading_whitespace(line); 26 if (indicator) 27 preserve_formatting(line); 28 29The intent is that this docstring would make it through the transform 30and still be legible and presented as it is in the source. If additional 31cases are handled, update this doc to describe the effect. 32""" 33 34__author__ = "[email protected]" 35import textwrap 36import sys 37 38def wrap(text): 39 if text: 40 return textwrap.fill(text, break_long_words=False) + '\n' 41 return "" 42 43 44def main(fileobj): 45 text = "" 46 output = "" 47 while True: 48 line = fileobj.readline() 49 if not line: 50 break 51 52 if line.lstrip() == line: 53 text += line 54 else: 55 output += wrap(text) 56 text="" 57 output += line 58 output += wrap(text) 59 60 # Replace the file or write to stdout. 61 if fileobj == sys.stdin: 62 fileobj = sys.stdout 63 else: 64 fileobj.seek(0) 65 fileobj.truncate(0) 66 fileobj.write(output) 67 68if __name__ == "__main__": 69 if len(sys.argv) > 1: 70 main(open(sys.argv[1], "r+")) 71 else: 72 main(sys.stdin) 73