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92 lines
2.7 KiB
Python
Executable file
92 lines
2.7 KiB
Python
Executable file
#! /usr/bin/env python
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# Update a bunch of files according to a script.
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# The input file contains lines of the form <filename>:<lineno>:<text>,
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# meaning that the given line of the given file is to be replaced
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# by the given text. This is useful for performing global substitutions
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# on grep output:
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import os
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import sys
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import regex
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pat = '^\([^: \t\n]+\):\([1-9][0-9]*\):'
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prog = regex.compile(pat)
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class FileObj:
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def __init__(self, filename):
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self.filename = filename
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self.changed = 0
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try:
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self.lines = open(filename, 'r').readlines()
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except IOError, msg:
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print '*** Can\'t open "%s":' % filename, msg
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self.lines = None
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return
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print 'diffing', self.filename
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def finish(self):
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if not self.changed:
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print 'no changes to', self.filename
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return
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try:
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os.rename(self.filename, self.filename + '~')
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fp = open(self.filename, 'w')
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except (os.error, IOError), msg:
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print '*** Can\'t rewrite "%s":' % self.filename, msg
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return
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print 'writing', self.filename
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for line in self.lines:
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fp.write(line)
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fp.close()
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self.changed = 0
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def process(self, lineno, rest):
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if self.lines is None:
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print '(not processed): %s:%s:%s' % (
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self.filename, lineno, rest),
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return
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i = eval(lineno) - 1
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if not 0 <= i < len(self.lines):
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print '*** Line number out of range: %s:%s:%s' % (
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self.filename, lineno, rest),
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return
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if self.lines[i] == rest:
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print '(no change): %s:%s:%s' % (
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self.filename, lineno, rest),
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return
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if not self.changed:
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self.changed = 1
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print '%sc%s' % (lineno, lineno)
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print '<', self.lines[i],
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print '---'
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self.lines[i] = rest
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print '>', self.lines[i],
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def main():
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if sys.argv[1:]:
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try:
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fp = open(sys.argv[1], 'r')
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except IOError, msg:
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print 'Can\'t open "%s":' % sys.argv[1], msg
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sys.exit(1)
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else:
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fp = sys.stdin
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curfile = None
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while 1:
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line = fp.readline()
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if not line:
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if curfile: curfile.finish()
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break
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n = prog.match(line)
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if n < 0:
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print 'Funny line:', line,
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continue
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filename, lineno = prog.group(1, 2)
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if not curfile or filename <> curfile.filename:
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if curfile: curfile.finish()
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curfile = FileObj(filename)
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curfile.process(lineno, line[n:])
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if __name__ == "__main__":
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main()
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