#!/usr/bin/env python3

"""Compile source on a range of commits

Usage:
  check-commits <start> <source>
"""

import docopt, os, sys, tempfile
from subprocess import check_call, check_output, run

args = docopt.docopt(__doc__)
start = args.get('<start>')
source = args.get('<source>')

cwd = os.getcwd()

with tempfile.TemporaryDirectory() as work_dir:
  check_call(['git', 'clone', 'https://github.com/fmtlib/fmt.git'],
             cwd=work_dir)
  repo_dir = os.path.join(work_dir, 'fmt')
  commits = check_output(
    ['git', 'rev-list', f'{start}..HEAD', '--abbrev-commit',
     '--', 'include', 'src'],
    text=True, cwd=repo_dir).rstrip().split('\n')
  commits.reverse()
  print('Time\tCommit')
  for commit in commits:
    check_call(['git', '-c', 'advice.detachedHead=false', 'checkout', commit],
               cwd=repo_dir)
    return_code = run(
      ['c++', '-std=c++11', '-O3', '-DNDEBUG', '-I', 'include',
       'src/format.cc', os.path.join(cwd, source)], cwd=repo_dir).return_code
    if return_code != 0:
      continue
    times = []
    for i in range(5):
      output = check_output([os.path.join(repo_dir, 'a.out')], text=True)
      times.append(float(output))
    message = check_output(['git', 'log', '-1', '--pretty=format:%s', commit],
                           cwd=repo_dir, text=True)
    print(f'{min(times)}\t{commit} {message[:40]}')
    sys.stdout.flush()