2018-11-01 00:08:29 +08:00
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# coding=utf-8
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2019-09-18 23:30:46 +08:00
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from __future__ import absolute_import
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2018-11-01 00:08:29 +08:00
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import os
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import sys
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def find_executable(executable, path=None):
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"""Find if 'executable' can be run. Looks for it in 'path'
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(string that lists directories separated by 'os.pathsep';
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defaults to os.environ['PATH']). Checks for all executable
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extensions. Returns full path or None if no command is found.
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"""
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if path is None:
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path = os.environ['PATH']
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paths = path.split(os.pathsep)
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extlist = ['']
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if os.name == 'os2':
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(base, ext) = os.path.splitext(executable)
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# executable files on OS/2 can have an arbitrary extension, but
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# .exe is automatically appended if no dot is present in the name
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if not ext:
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executable = executable + ".exe"
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elif sys.platform == 'win32':
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pathext = os.environ['PATHEXT'].lower().split(os.pathsep)
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(base, ext) = os.path.splitext(executable)
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if ext.lower() not in pathext:
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extlist = pathext
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for ext in extlist:
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execname = executable + ext
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if os.path.isfile(execname):
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return execname
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else:
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for p in paths:
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f = os.path.join(p, execname)
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if os.path.isfile(f):
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return f
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else:
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return None
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