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# -*- coding: utf-8 -*-
"""Cross-platform which command."""
import os
import sys
__all__ = ['which']
WIN_ALLOW_CROSS_ARCH = True
def which(program):
"""Identify the location of an executable file."""
if os.path.split(program)[0]:
program_path = find_exe(program)
if program_path:
return program_path
else:
for path in get_path_list():
program_path = find_exe(os.path.join(path, program))
if program_path:
return program_path
return None
def is_exe(path):
return os.path.isfile(path) and os.access(path, os.X_OK)
def _get_path_list():
return os.environ['PATH'].split(os.pathsep)
if os.name == 'nt':
def find_exe(program):
root, ext = os.path.splitext(program)
if ext:
if is_exe(program):
return program
else:
for ext in os.environ['PATHEXT'].split(os.pathsep):
program_path = root + ext.lower()
if is_exe(program_path):
return program_path
return None
def get_path_list():
paths = _get_path_list()
if WIN_ALLOW_CROSS_ARCH:
alt_sys_path = os.path.expandvars(r"$WINDIR\Sysnative")
if os.path.isdir(alt_sys_path):
paths.insert(0, alt_sys_path)
else:
alt_sys_path = os.path.expandvars(r"$WINDIR\SysWOW64")
if os.path.isdir(alt_sys_path):
paths.append(alt_sys_path)
return paths
else:
def find_exe(program):
return program if is_exe(program) else None
get_path_list = _get_path_list
def main():
for arg in sys.argv[1:]:
path = which(arg)
if path:
print(path)
if __name__ == '__main__':
sys.exit(main())
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