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Simplify mixed-line-ending hook
This commit is contained in:
Anthony Sottile
parent
47c4d9ebed
commit
fbcd096ea9
3 changed files with 134 additions and 315 deletions
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@ -1,212 +1,83 @@
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from __future__ import absolute_import
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from __future__ import print_function
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from __future__ import unicode_literals
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import argparse
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import re
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import sys
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from enum import Enum
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import collections
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class LineEnding(Enum):
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CR = b'\r', 'cr', re.compile(b'\r(?!\n)', re.DOTALL)
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CRLF = b'\r\n', 'crlf', re.compile(b'\r\n', re.DOTALL)
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LF = b'\n', 'lf', re.compile(b'(?<!\r)\n', re.DOTALL)
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def __init__(self, string, opt_name, regex):
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self.string = string
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self.str_print = repr(string)
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self.opt_name = opt_name
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self.regex = regex
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CRLF = b'\r\n'
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LF = b'\n'
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CR = b'\r'
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# Prefer LF to CRLF to CR, but detect CRLF before LF
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ALL_ENDINGS = (CR, CRLF, LF)
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FIX_TO_LINE_ENDING = {'cr': CR, 'crlf': CRLF, 'lf': LF}
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class MixedLineEndingOption(Enum):
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AUTO = 'auto', None
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NO = 'no', None
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CRLF = LineEnding.CRLF.opt_name, LineEnding.CRLF
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LF = LineEnding.LF.opt_name, LineEnding.LF
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def __init__(self, opt_name, line_ending_enum):
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self.opt_name = opt_name
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self.line_ending_enum = line_ending_enum
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def _fix(filename, contents, ending):
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new_contents = b''.join(
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line.rstrip(b'\r\n') + ending for line in contents.splitlines(True)
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)
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with open(filename, 'wb') as f:
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f.write(new_contents)
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class MixedLineDetection(Enum):
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NOT_MIXED = 1, False, None
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UNKNOWN = 2, False, None
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MIXED_MOSTLY_CRLF = 3, True, LineEnding.CRLF
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MIXED_MOSTLY_LF = 4, True, LineEnding.LF
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MIXED_MOSTLY_CR = 5, True, LineEnding.CR
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def fix_filename(filename, fix):
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with open(filename, 'rb') as f:
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contents = f.read()
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def __init__(self, index, mle_found, line_ending_enum):
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# TODO hack to prevent enum overriding
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self.index = index
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self.mle_found = mle_found
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self.line_ending_enum = line_ending_enum
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counts = collections.defaultdict(int)
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for line in contents.splitlines(True):
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for ending in ALL_ENDINGS:
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if line.endswith(ending):
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counts[ending] += 1
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break
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ANY_LINE_ENDING_PATTERN = re.compile(
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b'(' + LineEnding.CRLF.regex.pattern +
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b'|' + LineEnding.LF.regex.pattern +
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b'|' + LineEnding.CR.regex.pattern + b')',
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)
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# Some amount of mixed line endings
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mixed = sum(bool(x) for x in counts.values()) > 1
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if fix == 'no' or (fix == 'auto' and not mixed):
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return mixed
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def mixed_line_ending(argv=None):
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options = _parse_arguments(argv)
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if fix == 'auto':
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max_ending = LF
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max_lines = 0
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# ordering is important here such that lf > crlf > cr
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for ending_type in ALL_ENDINGS:
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# also important, using >= to find a max that prefers the last
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if counts[ending_type] >= max_lines:
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max_ending = ending_type
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max_lines = counts[ending_type]
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filenames = options['filenames']
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fix_option = options['fix']
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if fix_option == MixedLineEndingOption.NO:
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return _process_no_fix(filenames)
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elif fix_option == MixedLineEndingOption.AUTO:
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return _process_fix_auto(filenames)
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# when a line ending character is forced with --fix option
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_fix(filename, contents, max_ending)
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return 1
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else:
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return _process_fix_force(filenames, fix_option.line_ending_enum)
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target_ending = FIX_TO_LINE_ENDING[fix]
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# find if there are lines with *other* endings
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del counts[target_ending]
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other_endings = bool(sum(counts.values()))
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if other_endings:
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_fix(filename, contents, target_ending)
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return other_endings
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def _parse_arguments(argv=None):
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def main(argv=None):
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parser = argparse.ArgumentParser()
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parser.add_argument(
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'-f',
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'--fix',
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choices=[m.opt_name for m in MixedLineEndingOption],
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default=MixedLineEndingOption.AUTO.opt_name,
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'-f', '--fix',
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choices=('auto', 'no') + tuple(FIX_TO_LINE_ENDING),
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default='auto',
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help='Replace line ending with the specified. Default is "auto"',
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)
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parser.add_argument('filenames', nargs='*', help='Filenames to fix')
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args = parser.parse_args(argv)
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fix, = (
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member for name, member
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in MixedLineEndingOption.__members__.items()
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if member.opt_name == args.fix
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)
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options = {
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'fix': fix, 'filenames': args.filenames,
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}
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return options
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def _detect_line_ending(filename):
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with open(filename, 'rb') as f:
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buf = f.read()
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le_counts = {}
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for le_enum in LineEnding:
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le_counts[le_enum] = len(le_enum.regex.findall(buf))
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mixed = False
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le_found_previously = False
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most_le = None
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max_le_count = 0
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for le, le_count in le_counts.items():
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le_found_cur = le_count > 0
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mixed |= le_found_previously and le_found_cur
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le_found_previously |= le_found_cur
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if le_count == max_le_count:
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most_le = None
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elif le_count > max_le_count:
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max_le_count = le_count
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most_le = le
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if not mixed:
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return MixedLineDetection.NOT_MIXED
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for mld in MixedLineDetection:
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if (
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mld.line_ending_enum is not None and
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mld.line_ending_enum == most_le
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):
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return mld
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return MixedLineDetection.UNKNOWN
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def _process_no_fix(filenames):
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print('Checking if the files have mixed line ending.')
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mle_filenames = []
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for filename in filenames:
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detect_result = _detect_line_ending(filename)
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if detect_result.mle_found:
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mle_filenames.append(filename)
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mle_found = len(mle_filenames) > 0
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if mle_found:
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print(
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'The following files have mixed line endings:\n\t%s',
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'\n\t'.join(mle_filenames),
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)
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return 1 if mle_found else 0
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def _process_fix_auto(filenames):
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mle_found = False
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for filename in filenames:
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detect_result = _detect_line_ending(filename)
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if detect_result == MixedLineDetection.NOT_MIXED:
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print('The file %s has no mixed line ending', filename)
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elif detect_result == MixedLineDetection.UNKNOWN:
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print(
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'Could not define most frequent line ending in '
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'file %s. File skiped.', filename,
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)
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mle_found = True
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else:
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le_enum = detect_result.line_ending_enum
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print(
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'The file %s has mixed line ending with a '
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'majority of %s. Converting...', filename, le_enum.str_print,
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)
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_convert_line_ending(filename, le_enum.string)
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mle_found = True
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print(
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'The file %s has been converted to %s line ending.',
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filename, le_enum.str_print,
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)
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return 1 if mle_found else 0
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def _process_fix_force(filenames, line_ending_enum):
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for filename in filenames:
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_convert_line_ending(filename, line_ending_enum.string)
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print(
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'The file %s has been forced to %s line ending.',
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filename, line_ending_enum.str_print,
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)
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return 1
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def _convert_line_ending(filename, line_ending):
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with open(filename, 'rb+') as f:
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bufin = f.read()
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# convert line ending
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bufout = ANY_LINE_ENDING_PATTERN.sub(line_ending, bufin)
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# write the result in the file replacing the existing content
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f.seek(0)
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f.write(bufout)
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f.truncate()
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retv = 0
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for filename in args.filenames:
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retv |= fix_filename(filename, args.fix)
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return retv
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if __name__ == '__main__':
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sys.exit(mixed_line_ending())
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exit(main())
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