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# -*- coding: utf-8 -*- |
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"""Check if contents of directory has changed. |
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""" |
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from __future__ import print_function |
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import argparse |
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import os |
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import hashlib |
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from .listfiles import list_files |
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from .path import Path |
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def digest(dirname, glob=None): |
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"""Returns the md5 digest of all interesting files (or glob) in `dirname`. |
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""" |
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md5 = hashlib.md5() |
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if glob is None: |
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fnames = [fname for _, fname in list_files(Path(dirname))] |
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for fname in sorted(fnames): |
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fname = os.path.join(dirname, fname) |
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md5.update(open(fname, 'rb').read()) |
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else: |
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fnames = Path(dirname).glob(glob) |
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for fname in sorted(fnames): |
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md5.update(fname.open('rb').read()) |
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return md5.hexdigest() |
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def changed(dirname, filename='.md5', args=None, glob=None): |
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"""Has `glob` changed in `dirname` |
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Args: |
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dirname: directory to measure |
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filename: filename to store checksum |
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""" |
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root = Path(dirname) |
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if not root.exists(): |
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# if dirname doesn't exist it is changed (by definition) |
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return True |
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cachefile = root / filename |
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current_digest = cachefile.open().read() if cachefile.exists() else "" |
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_digest = digest(dirname, glob=glob) |
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if args and args.verbose: # pragma: nocover |
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print("md5:", _digest) |
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has_changed = current_digest != _digest |
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if has_changed: |
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with open(os.path.join(dirname, filename), 'w') as fp: |
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fp.write(_digest) |
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return has_changed |
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class Directory(Path): |
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"""A path that is a directory. |
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""" |
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def changed(self, filename='.md5', glob=None): |
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"""Are any of the files matched by ``glob`` changed? |
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""" |
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if glob is not None: |
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filename += '.glob-' + ''.join(ch.lower() |
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for ch in glob if ch.isalpha()) |
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return changed(self, filename, glob=glob) |
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def main(): # pragma: nocover |
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"""Return exit code of zero iff directory is not changed. |
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""" |
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p = argparse.ArgumentParser() |
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p.add_argument( |
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'directory', |
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help="Directory to check" |
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) |
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p.add_argument( |
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'--verbose', '-v', action='store_true', |
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help="increase verbosity" |
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) |
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args = p.parse_args() |
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import sys |
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_changed = changed(sys.argv[1], args=args) |
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sys.exit(_changed) |
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if __name__ == "__main__": # pragma: nocover |
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main() |
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datakortet /
dkfileutils
