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annotate python/lsex.py @ 698:3481ac810b60

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author Jeff Hammel <k0scist@gmail.com>
date Tue, 12 Aug 2014 16:44:26 -0700
parents 77e7cab3e9f2
children 20aa4a6ef719
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1 #!/usr/bin/env python
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2 import os
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3 import sys
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4 from optparse import OptionParser
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5
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6 # make sure duplicate path elements aren't printed twice
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7 def ordered_set(alist):
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8 seen = set()
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9 new = []
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10 for item in alist:
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11 if item in seen:
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12 continue
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13 seen.add(item)
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14 new.append(item)
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15 return new
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16
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17 def lsex(path=None):
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18 """
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19 list of executable files on the path
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20
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21 - path: list or PATH-style string of directories to search.
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22 if not specified, use system PATH
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23 """
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24
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25 if path is None:
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26 # use system path
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27 path = os.environ['PATH']
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28 if isinstance(path, basestring):
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29 path = ordered_set(path.split(os.pathsep))
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30
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31 executables = []
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32
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33 # add the executable files to the list
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34 for i in path:
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35 if not os.path.isdir(i):
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36 continue
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37 files = [ os.path.join(i,j) for j in os.listdir(i) ]
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38 files = filter(lambda x: os.access(x, os.X_OK), files)
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39 files.sort() # just to make the output pretty
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40 executables.extend(files)
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41 return executables
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42
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43 def executable_names(path=None):
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44 executables = lsex(path)
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45 executables = set([os.path.basename(i) for i in executables])
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46 return executables
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47
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48 if __name__ == '__main__':
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49 parser = OptionParser()
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50 parser.add_option('--names', action='store_true', default=False,
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51 help="list only the set of names")
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52
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53 options, args = parser.parse_args()
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54 if options.names:
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55 for i in sorted(executable_names()):
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56 print i
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57 sys.exit(0)
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58
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59 for i in lsex():
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60 print i