Mercurial > hg > TextShaper

annotate textshaper/indent.py @ 46:7e63ca061b6c

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author Jeff Hammel <k0scist@gmail.com>
date Sat, 16 May 2015 18:53:53 -0700
parents 88a69d587326
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python
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2
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3 """
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4 indentation of text blocks
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5 """
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7 import argparse
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8 import os
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9 import sys
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10 from .decorator import lines
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12 @lines
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13 def indent(text, indentation=4, space=' ', strict=False):
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14 """
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15 indent a block of text
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17 text -- lines of text to indent
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18 indentation -- number of spaces to indent
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19 space -- what to indent with
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20 strict -- whether to enforce required whitespace for negative indentation
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21 """
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23 if not indentation:
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24 # nothing to do
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25 return text
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27 if indentation > 0:
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28 retval = [space * indentation + line for line in text]
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29 else:
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30 # negative indentation
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31 indentation = -indentation
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32 retval = []
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33 for line in text:
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34 prefix = line[:indentation]
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35 for index, char in enumerate(prefix):
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36 if not char == space:
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37 if strict:
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38 raise AssertionError("Found non-'%s' charcter at column %d for indentation -%d" % (space, index, indentation))
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39 break
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40 else:
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41 index = indentation
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42 retval.append(line[index:])
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43
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44 return retval
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46 @lines
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47 def deindent(text):
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48 """strip lines"""
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49 return [line.strip() for line in text]
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50
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51 ### CLI
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52
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53 def add_arguments(parser):
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54 parser.add_argument('infile', nargs='?', type=argparse.FileType('r'),
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55 default=sys.stdin)
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56 parser.add_argument('-o', '--output', dest='output',
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57 help="output file or stdout if not given")
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60 def main(args=sys.argv[1:]):
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61 """CLI"""
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63 # parse command line
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64 description = """indent files or stdin if no files given"""
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65 parser = argparse.Argument(description=__doc__)
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66 add_arguments(parser)
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67 options = parser.parse_args(args)
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69 # process input
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70 for f in _files():
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72 # indent the text
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73 indented = '\n'.join(indent(f))
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75 # append to output
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76 if options.output:
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77 with open(options.output, 'a') as f:
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78 f.write(indented)
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79 else:
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80 sys.stdout.write(indented)
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82 if __name__ == '__main__':
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83 main()