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"""Script to run an arbitrary program after changing the current directory.

  % python run_after_chdir.py / ls
  auto emul home lib  media proc srv var
  ...

The example above is to run ls command in / directory.
"""

import os
import subprocess
import sys


def main():
  """The main function."""
  # Delete the self program name (i.e. run_after_chdir.py).
  sys.argv.pop(0)
  # The first parameter is the destination directory.
  destination_directory_name = sys.argv.pop(0)
  os.chdir(destination_directory_name)
  # Rest are the target program name and the parameters, but we special
  # case if the target program name ends with '.py'
  if sys.argv[0].endswith('.py'):
    sys.argv.insert(0, sys.executable)  # Inject the python interpreter path.
  # We don't capture stdout and stderr from Popen. The output will just
  # be emitted to a terminal or console.
  print(sys.argv)
  sys.exit(subprocess.call(sys.argv))

if __name__ == '__main__':
  main()
