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annotate python/lsex.py @ 107:1da1baa03ac1

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add a cli example program
author Jeff Hammel <jhammel@mozilla.com>
date Mon, 29 Nov 2010 07:21:30 -0800
parents 71576cdc28ab
children 77e7cab3e9f2
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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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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 executable files on the path
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20 - path: list of directories to search. if not specified, use system path
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21 """
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22
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23 if path is None:
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24 # use system path
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25 path = ordered_set(os.environ['PATH'].split(':'))
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26
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27 executables = []
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28
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29 # add the executable files to the list
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30 for i in path:
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31 if not os.path.isdir(i):
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32 continue
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33 files = [ os.path.join(i,j) for j in os.listdir(i) ]
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34 files = filter(lambda x: os.access(x, os.X_OK), files)
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35 files.sort() # just to make the output pretty
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36 executables.extend(files)
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37 return executables
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38
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39 def executable_names(path=None):
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40 executables = lsex(path)
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41 executables = set([os.path.basename(i) for i in executables])
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42 return executables
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43
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44 if __name__ == '__main__':
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45 parser = OptionParser()
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46 parser.add_option('--names', action='store_true', default=False,
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47 help="list only the set of names")
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48
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49 options, args = parser.parse_args()
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50 if options.names:
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51 for i in sorted(executable_names()):
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52 print i
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53 sys.exit(0)
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54
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55 for i in lsex():
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56 print i