from __future__ import print_function

import inspect
import os
import sys
import traceback


def backtrace_to_here():
  trace = inspect.trace(context=1)
  trace.pop(0)  # discard this helper function frame

  pre_processed = []
  for info in trace:
    frame = info[0]
    tb = inspect.getframeinfo(frame)
    filename = tb.filename
    if filename.startswith('{{chroot_parent}}'):
      relpath_parent = os.path.relpath(filename, '{{chroot_parent}}')
      relpath = relpath_parent.split(os.sep, 1)[1]
      filename = os.path.join('[srcroot]', relpath)
    line_text = tb.code_context[tb.index]
    pre_processed.append((filename, tb.lineno, tb.function, line_text))

  return ''.join(traceback.format_list(pre_processed)).rstrip()


def log(message=''):
  print(message, file=sys.stderr)


if __name__ == '__main__':
  # TODO(John Sirois): Consider collecting all import errors before exiting non-zero.
  {{#modules}}
  try:
    {{import_statement}}
  except ImportError as e:
    log()
    log("Failed to eval '{{source}}':")
    log(backtrace_to_here())
    log(str(e))
    sys.exit(1)

  {{/modules}}
  sys.exit(0)