#! /usr/bin/env python3

# Variant of "which".
# On stderr, near and total misses are reported.
# '-l<flags>' argument adds ls -l<flags> of each file found.

import sys
if sys.path[0] in (".", ""): del sys.path[0]

import sys, os
from stat import *

def msg(str):
 sys.stderr.write(str + '\n')

def main():
 pathlist = os.environ['PATH'].split(os.pathsep)

 sts = 0
 longlist = ''

 if sys.argv[1:] and sys.argv[1][:2] == '-l':
 longlist = sys.argv[1]
 del sys.argv[1]

 for prog in sys.argv[1:]:
 ident = ()
 for dir in pathlist:
 filename = os.path.join(dir, prog)
 try:
 st = os.stat(filename)
 except OSError:
 continue
 if not S_ISREG(st[ST_MODE]):
 msg(filename + ': not a disk file')
 else:
 mode = S_IMODE(st[ST_MODE])
 if mode & 0o111:
 if not ident:
 print(filename)
 ident = st[:3]
 else:
 if st[:3] == ident:
 s = 'same as: '
 else:
 s = 'also: '
 msg(s + filename)
 else:
 msg(filename + ': not executable')
 if longlist:
 sts = os.system('ls ' + longlist + ' ' + filename)
 if sts: msg('"ls -l" exit status: ' + repr(sts))
 if not ident:
 msg(prog + ': not found')
 sts = 1

 sys.exit(sts)

if __name__ == '__main__':
 main()