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