Mercurial > hg > TextShaper

annotate textshaper/indent.py @ 21:e6f680d25d63

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author Jeff Hammel <k0scist@gmail.com>
date Sun, 23 Feb 2014 00:45:06 -0800
parents 0d0db0d79bfd
children 0930c6884f8a
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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6
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7 import optparse
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8 import os
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9 import sys
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10
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11 def indent(text, indentation=4, space=' ', strict=False):
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12 """
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13 indent a block of text
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14
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15 text -- lines of text to indent
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16 indentation -- number of spaces to indent
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17 space -- what to indent with
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18 strict -- whether to enforce required whitespace for negative indentation
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19 """
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20
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21 if not indentation:
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22 # nothing to do
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23 return text
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24
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25 if indentation > 0:
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26 retval = [space * indentation + line for line in text]
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27 else:
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28 # negative indentation
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29 indentation = -indentation
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30 retval = []
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31 for line in text:
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32 prefix = line[:indentation]
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33 for index, char in enumerate(prefix):
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34 if not char == space:
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35 if strict:
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36 raise AssertionError("Found non-'%s' charcter at column %d for indentation -%d" % (space, index, indentation))
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37 break
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38 else:
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39 index = indentation
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40 retval.append(line[index:])
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41
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42 return retval
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43
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44
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45 def main(args=sys.argv[1:]):
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46 # TODO : refactor to be more general and stuff
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47
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48 # parse command line
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49 usage = '%prog [options] [file] [file2] [...]'
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50 description = """indent files or stdin if no files given"""
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51 parser = optparse.OptionParser(usage=usage, description=__doc__)
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52 parser.add_option('-o', '--output', dest='output',
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53 help="output file or stdout if not given")
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54 options, files = parser.parse_args(args)
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55
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56 # input from files or stdin
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57 if files:
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58 missing = [not os.path.exists(filename) for filename in files]
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59 if missing:
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60 parser.error("File(s) not found: %s" % ', '.join(missing))
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61 def _files():
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62 for filename in files:
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63 with open(f, 'r') as f:
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64 yield f
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65 else:
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66 def _files():
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67 yield sys.stdin
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68
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69 # process input
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70 for f in _files():
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71 print f
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72
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73 if __name__ == '__main__':
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74 main()