Mercurial > cpython-lru_cache-weakref

annotate Tools/scripts/rgrep.py @ 49955:878d40468c4e legacy-trunk

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Issue #4384: Added logging integration with warnings module using captureWarnings(). This change includes a NullHandler which does nothing; it will be of use to library developers who want to avoid the "No handlers could be found for logger XXX" message which can appear if the library user doesn't configure logging.
author Vinay Sajip <vinay_sajip@yahoo.co.uk>
date Wed, 03 Dec 2008 23:22:58 +0000
parents 8a7a2f1f88f0
children 6b18a095c2e7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0398051f8ffa New tool: reverse grep (greps from the end). Uses a fairly efficient
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1 #! /usr/bin/env python
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2
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3 """Reverse grep.
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4
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5 Usage: rgrep [-i] pattern file
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6 """
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7
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8 import sys
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9 import re
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10 import getopt
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11
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12 def main():
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13 bufsize = 64*1024
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14 reflags = 0
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15 opts, args = getopt.getopt(sys.argv[1:], "i")
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16 for o, a in opts:
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17 if o == '-i':
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18 reflags = reflags | re.IGNORECASE
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19 if len(args) < 2:
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20 usage("not enough arguments")
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21 if len(args) > 2:
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22 usage("exactly one file argument required")
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23 pattern, filename = args
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24 try:
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25 prog = re.compile(pattern, reflags)
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26 except re.error, msg:
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27 usage("error in regular expression: %s" % str(msg))
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28 try:
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29 f = open(filename)
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30 except IOError, msg:
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31 usage("can't open %s: %s" % (repr(filename), str(msg)), 1)
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32 f.seek(0, 2)
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33 pos = f.tell()
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34 leftover = None
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35 while pos > 0:
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36 size = min(pos, bufsize)
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37 pos = pos - size
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38 f.seek(pos)
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39 buffer = f.read(size)
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8a7a2f1f88f0 Apply diff2.txt from SF patch http://www.python.org/sf/572113
Walter Dörwald <walter@livinglogic.de>
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40 lines = buffer.split("\n")
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41 del buffer
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42 if leftover is None:
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43 if not lines[-1]:
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44 del lines[-1]
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45 else:
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46 lines[-1] = lines[-1] + leftover
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47 if pos > 0:
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48 leftover = lines[0]
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49 del lines[0]
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50 else:
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51 leftover = None
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52 lines.reverse()
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53 for line in lines:
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54 if prog.search(line):
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55 print line
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56
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57 def usage(msg, code=2):
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58 sys.stdout = sys.stderr
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59 print msg
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60 print __doc__
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61 sys.exit(code)
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62
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63 if __name__ == '__main__':
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64 main()