Mercurial > cpython-lru_cache-weakref

annotate Tools/scripts/rgrep.py @ 66978:aed2bbafa550 3.1

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Blocked revisions 87324 via svnmerge ........ r87324 | r.david.murray | 2010-12-16 14:08:51 -0500 (Thu, 16 Dec 2010) | 9 lines #10719: restore messages generated on invalid compileall args Before the introduction of filename arguments to compileall it gave semi useful messages about not being able to 'list' names that weren't valid directories. This fix restores that behavior. In addition to the test for this case, the patch also adds a test for the default behavior of compileall when no arguments are provided, and fixes a bug in one of the previously added tests. ........
author R. David Murray <rdmurray@bitdance.com>
date Thu, 16 Dec 2010 19:10:16 +0000
parents 46625e6122e9
children fcfe324663a6
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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 as 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 as 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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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()