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annotate python/lsex.py @ 899:7ba1f770598c

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update email for BrightSign
author Jeff Hammel <k0scist@gmail.com>
date Tue, 16 Aug 2022 11:54:42 -0700
parents 20aa4a6ef719
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1 #!/usr/bin/env python
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2
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3 import os
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4 import sys
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5 from optparse import OptionParser
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6
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7 try:
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8 # python 2
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9 string = (str, unicode)
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10 except NameError:
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11 # python 3
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12 string = (str,)
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13
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14 def ordered_set(alist):
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15 """make sure duplicate path elements aren't printed twice"""
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16
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17 seen = set()
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18 new = []
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19 for item in alist:
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20 if item in seen:
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21 continue
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22 seen.add(item)
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23 new.append(item)
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24 return new
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25
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26 def lsex(path=None):
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27 """
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28 list of executable files on the path
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29
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30 - path: list or PATH-style string of directories to search.
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31 if not specified, use system PATH
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32 """
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33
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34 if path is None:
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35 # use system path
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36 path = os.environ['PATH']
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37 if isinstance(path, string):
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38 path = ordered_set(path.split(os.pathsep))
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40 executables = []
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41
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42 # add the executable files to the list
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43 for i in path:
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44 if not os.path.isdir(i):
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45 continue
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46 files = [ os.path.join(i,j) for j in os.listdir(i) ]
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47 files = list(filter(lambda x: os.access(x, os.X_OK), files))
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48 files.sort() # just to make the output pretty
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49 executables.extend(files)
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50 return executables
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51
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52 def executable_names(path=None):
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53 executables = lsex(path)
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54 executables = set([os.path.basename(i) for i in executables])
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55 return executables
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56
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57 if __name__ == '__main__':
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58 parser = OptionParser()
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59 parser.add_option('--names', action='store_true', default=False,
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60 help="list only the set of names")
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62 options, args = parser.parse_args()
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63 if options.names:
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64 print ('\n'.join(sorted(executable_names())))
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65 sys.exit(0)
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67 for i in lsex():
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68 print (i)