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annotate python/lsex.py @ 922:74dc16f074be default tip
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author | Jeff Hammel <k0scist@gmail.com> |
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date | Thu, 03 Oct 2024 05:36:19 -0700 |
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1 #!/usr/bin/env python |
865 | 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 |
865 | 7 try: |
8 # python 2 | |
9 string = (str, unicode) | |
10 except NameError: | |
11 # python 3 | |
12 string = (str,) | |
13 | |
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14 def ordered_set(alist): |
865 | 15 """make sure duplicate path elements aren't printed twice""" |
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 """ |
367 | 28 list of executable files on the path |
29 | |
30 - path: list or PATH-style string of directories to search. | |
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 |
367 | 36 path = os.environ['PATH'] |
865 | 37 if isinstance(path, string): |
367 | 38 path = ordered_set(path.split(os.pathsep)) |
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39 |
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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) ] |
865 | 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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61 |
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62 options, args = parser.parse_args() |
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63 if options.names: |
865 | 64 print ('\n'.join(sorted(executable_names()))) |
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65 sys.exit(0) |
865 | 66 |
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67 for i in lsex(): |
865 | 68 print (i) |