/
pygrep.py
executable file
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/
pygrep.py
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#!/usr/bin/env python3
import sys, re, argparse, collections, getfiles
DEF_KWARGS = {
'match_files': False,
'no_match_files': False,
'only_match': False,
'fixed': False,
'invert': False,
'ignore_case': False,
'line': False,
'word': False,
'line_number': False,
'with_filename': False,
'count': False,
'before_context': None,
'after_context': None,
'context': 0,
}
def grep(pattern, *files, **kwargs):
if isinstance(pattern, argparse.Namespace):
args = pattern
pattern = args.pattern
files = args.files
else:
kwargs2 = DEF_KWARGS.copy()
kwargs2.update(kwargs)
args = argparse.Namespace(pattern=pattern, files=files, **kwargs2)
files = getfiles.getfiles(files)
flags = args.ignore_case and re.IGNORECASE
if args.fixed:
pattern = re.escape(pattern)
if args.line:
pattern = r'^(?:' + pattern + r')$'
if args.word:
pattern = r'\b(?:' + pattern + r')\b'
pattern = re.compile(pattern, flags)
before = after = args.context
if args.before_context is not None:
before = args.before_context
if args.after_context is not None:
after = args.after_context
before_buff = collections.deque(maxlen=before)
if args.match_files or args.no_match_files:
args.count, args.with_filename = False, False
with getfiles.stdout_encoding():
for file in files:
if args.count:
count = 0
print_filename = args.with_filename
before_buff.clear()
after_limit = 0
for lno, line in enumerate(file):
match = pattern.search(line)
if args.only_match:
matches = pattern.finditer(line)
if (match and not args.invert) or (not match and args.invert):
if args.match_files:
print(file.name)
break
if args.no_match_files:
break
if print_filename:
print('\n-- {} --'.format(file.name))
print_filename = False
if args.count:
count += 1
continue
print(''.join(before_buff), end='')
before_buff.clear()
prefix = '{:3}:'.format(lno) if args.line_number else ''
if args.only_match:
print('\n'.join(prefix + m.group() for m in matches))
else:
print(prefix + line, end='')
after_limit = after
elif after_limit:
if args.line_number:
line = '{:3}-{}'.format(lno, line)
print(line, end='')
after_limit -= 1
else:
if args.line_number:
line = '{:3}-{}'.format(lno, line)
before_buff.append(line)
else:
if args.no_match_files: print(file.name)
if args.count:
print(count)
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument('pattern')
parser.add_argument('files', nargs='*')
parser.add_argument('-l', '--match-files', action='store_true')
parser.add_argument('-L', '--no-match-files', action='store_true')
parser.add_argument('-o', '--only-match', action='store_true')
parser.add_argument('-F', '--fixed', action='store_true')
parser.add_argument('-v', '--invert', action='store_true')
parser.add_argument('-i', '--ignore-case', action='store_true')
parser.add_argument('-x', '--line', action='store_true')
parser.add_argument('-w', '--word', action='store_true')
parser.add_argument('-n', '--line-number', action='store_true')
parser.add_argument('-H', '--with-filename', action='store_true')
parser.add_argument('-c', '--count', action='store_true')
parser.add_argument('-B', '--before-context', type=int)
parser.add_argument('-A', '--after-context', type=int)
parser.add_argument('-C', '--context', type=int, default=0)
args = parser.parse_args()
grep(args)