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49 lines
2.0 KiB
Python
49 lines
2.0 KiB
Python
from functools import partial
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all_flags = ['n', 'l', 'i', 'v', 'x', 'm'] # m for multiple files
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# Main grep function that works on multiple files
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def grep(pattern, flags, files):
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# Parse the flags into a dictionary
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flags = [flag.strip('-').strip() for flag in flags.split()]
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flags = {k : k in flags for k in all_flags}
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flags['m'] = len(files) > 1
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# Parse all the files given and then concatenate into a string
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res = [grep_individual(pattern, flags, filename) for filename in files]
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res = '\n'.join(list(filter(None, res))) # Filters out empty strings
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return res + '\n' if len(res) > 0 else ''
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# Matching function with options for case, full match and inversion
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def match(subtext, text, case=True, full=False, invert=False):
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if not case:
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subtext, text = subtext.lower(), text.lower()
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res = (subtext == text) if full else (subtext in text)
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return not res if invert else res
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# Function for processing against a individual file
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def grep_individual(pattern, flags, filename):
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# Create a local matching function using partial with the flags set
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localmatch = partial(match, case=not flags['i'], full=flags['x'], invert=flags['v'])
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text = open(filename, 'r').read()
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result = []
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if not flags['l']:
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for i, line in enumerate(text.split('\n')):
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if localmatch(pattern, line):
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pieces = [line]
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# Add number to beginning
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if flags['n']:
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pieces.insert(0, str(i + 1))
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# If multiple files, add the file name to the front furthermore
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if flags['m']:
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pieces.insert(0, filename)
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# Kind of a funky way to be doing it, but it's alright.
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res = ':'.join(pieces)
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result.append(res)
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return '\n'.join(result)
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# File name only flags
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elif flags['l']:
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for line in text.split('\n'):
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# Returns as soon as a match is found
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if localmatch(pattern, line):
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return filename
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return '' |