| 1 | #! /usr/bin/env python
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| 2 |
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| 3 | # Update a bunch of files according to a script.
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| 4 | # The input file contains lines of the form <filename>:<lineno>:<text>,
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| 5 | # meaning that the given line of the given file is to be replaced
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| 6 | # by the given text. This is useful for performing global substitutions
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| 7 | # on grep output:
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| 8 |
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| 9 | import os
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| 10 | import sys
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| 11 | import re
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| 12 |
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| 13 | pat = '^([^: \t\n]+):([1-9][0-9]*):'
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| 14 | prog = re.compile(pat)
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| 15 |
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| 16 | class FileObj:
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| 17 | def __init__(self, filename):
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| 18 | self.filename = filename
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| 19 | self.changed = 0
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| 20 | try:
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| 21 | self.lines = open(filename, 'r').readlines()
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| 22 | except IOError, msg:
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| 23 | print '*** Can\'t open "%s":' % filename, msg
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| 24 | self.lines = None
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| 25 | return
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| 26 | print 'diffing', self.filename
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| 27 |
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| 28 | def finish(self):
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| 29 | if not self.changed:
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| 30 | print 'no changes to', self.filename
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| 31 | return
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| 32 | try:
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| 33 | os.rename(self.filename, self.filename + '~')
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| 34 | fp = open(self.filename, 'w')
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| 35 | except (os.error, IOError), msg:
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| 36 | print '*** Can\'t rewrite "%s":' % self.filename, msg
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| 37 | return
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| 38 | print 'writing', self.filename
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| 39 | for line in self.lines:
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| 40 | fp.write(line)
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| 41 | fp.close()
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| 42 | self.changed = 0
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| 43 |
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| 44 | def process(self, lineno, rest):
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| 45 | if self.lines is None:
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| 46 | print '(not processed): %s:%s:%s' % (
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| 47 | self.filename, lineno, rest),
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| 48 | return
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| 49 | i = eval(lineno) - 1
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| 50 | if not 0 <= i < len(self.lines):
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| 51 | print '*** Line number out of range: %s:%s:%s' % (
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| 52 | self.filename, lineno, rest),
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| 53 | return
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| 54 | if self.lines[i] == rest:
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| 55 | print '(no change): %s:%s:%s' % (
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| 56 | self.filename, lineno, rest),
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| 57 | return
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| 58 | if not self.changed:
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| 59 | self.changed = 1
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| 60 | print '%sc%s' % (lineno, lineno)
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| 61 | print '<', self.lines[i],
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| 62 | print '---'
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| 63 | self.lines[i] = rest
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| 64 | print '>', self.lines[i],
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| 65 |
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| 66 | def main():
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| 67 | if sys.argv[1:]:
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| 68 | try:
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| 69 | fp = open(sys.argv[1], 'r')
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| 70 | except IOError, msg:
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| 71 | print 'Can\'t open "%s":' % sys.argv[1], msg
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| 72 | sys.exit(1)
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| 73 | else:
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| 74 | fp = sys.stdin
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| 75 | curfile = None
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| 76 | while 1:
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| 77 | line = fp.readline()
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| 78 | if not line:
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| 79 | if curfile: curfile.finish()
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| 80 | break
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| 81 | n = prog.match(line)
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| 82 | if n < 0:
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| 83 | print 'Funny line:', line,
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| 84 | continue
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| 85 | filename, lineno = prog.group(1, 2)
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| 86 | if not curfile or filename <> curfile.filename:
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| 87 | if curfile: curfile.finish()
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| 88 | curfile = FileObj(filename)
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| 89 | curfile.process(lineno, line[n:])
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| 90 |
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| 91 | if __name__ == "__main__":
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| 92 | main()
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