217 lines
8.8 KiB
Python
217 lines
8.8 KiB
Python
# Copyright 2016 Hardcoded Software (http://www.hardcoded.net)
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#
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# This software is licensed under the "GPLv3" License as described in the "LICENSE" file,
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# which should be included with this package. The terms are also available at
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# http://www.gnu.org/licenses/gpl-3.0.html
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import logging
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import re
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import os.path as op
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from collections import namedtuple
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from hscommon.jobprogress import job
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from hscommon.util import dedupe, rem_file_ext, get_file_ext
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from hscommon.trans import tr
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from core import engine
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# It's quite ugly to have scan types from all editions all put in the same class, but because there's
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# there will be some nasty bugs popping up (ScanType is used in core when in should exclusively be
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# used in core_*). One day I'll clean this up.
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class ScanType:
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FILENAME = 0
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FIELDS = 1
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FIELDSNOORDER = 2
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TAG = 3
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FOLDERS = 4
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CONTENTS = 5
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# PE
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FUZZYBLOCK = 10
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EXIFTIMESTAMP = 11
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ScanOption = namedtuple("ScanOption", "scan_type label")
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SCANNABLE_TAGS = ["track", "artist", "album", "title", "genre", "year"]
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RE_DIGIT_ENDING = re.compile(r"\d+|\(\d+\)|\[\d+\]|{\d+}")
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def is_same_with_digit(name, refname):
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# Returns True if name is the same as refname, but with digits (with brackets or not) at the end
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if not name.startswith(refname):
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return False
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end = name[len(refname) :].strip()
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return RE_DIGIT_ENDING.match(end) is not None
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def remove_dupe_paths(files):
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# Returns files with duplicates-by-path removed. Files with the exact same path are considered
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# duplicates and only the first file to have a path is kept. In certain cases, we have files
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# that have the same path, but not with the same case, that's why we normalize. However, we also
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# have case-sensitive filesystems, and in those, we don't want to falsely remove duplicates,
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# that's why we have a `samefile` mechanism.
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result = []
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path2file = {}
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for f in files:
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normalized = str(f.path).lower()
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if normalized in path2file:
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try:
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if op.samefile(normalized, str(path2file[normalized].path)):
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continue # same file, it's a dupe
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else:
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pass # We don't treat them as dupes
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except OSError:
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continue # File doesn't exist? Well, treat them as dupes
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else:
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path2file[normalized] = f
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result.append(f)
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return result
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class Scanner:
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def __init__(self):
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self.discarded_file_count = 0
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def _getmatches(self, files, j):
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if (
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self.size_threshold
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or self.large_size_threshold
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or self.scan_type
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in {
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ScanType.CONTENTS,
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ScanType.FOLDERS,
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}
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):
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j = j.start_subjob([2, 8])
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if self.size_threshold:
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files = [f for f in files if f.size >= self.size_threshold]
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if self.large_size_threshold:
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files = [f for f in files if f.size <= self.large_size_threshold]
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if self.scan_type in {ScanType.CONTENTS, ScanType.FOLDERS}:
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return engine.getmatches_by_contents(files, bigsize=self.big_file_size_threshold, j=j)
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else:
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j = j.start_subjob([2, 8])
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kw = {}
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kw["match_similar_words"] = self.match_similar_words
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kw["weight_words"] = self.word_weighting
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kw["min_match_percentage"] = self.min_match_percentage
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if self.scan_type == ScanType.FIELDSNOORDER:
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self.scan_type = ScanType.FIELDS
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kw["no_field_order"] = True
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func = {
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ScanType.FILENAME: lambda f: engine.getwords(rem_file_ext(f.name)),
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ScanType.FIELDS: lambda f: engine.getfields(rem_file_ext(f.name)),
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ScanType.TAG: lambda f: [
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engine.getwords(str(getattr(f, attrname)))
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for attrname in SCANNABLE_TAGS
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if attrname in self.scanned_tags
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],
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}[self.scan_type]
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for f in j.iter_with_progress(files, tr("Read metadata of %d/%d files")):
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logging.debug("Reading metadata of %s", f.path)
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f.words = func(f)
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return engine.getmatches(files, j=j, **kw)
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@staticmethod
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def _key_func(dupe):
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return -dupe.size
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@staticmethod
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def _tie_breaker(ref, dupe):
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refname = rem_file_ext(ref.name).lower()
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dupename = rem_file_ext(dupe.name).lower()
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if "copy" in dupename:
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return False
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if "copy" in refname:
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return True
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if is_same_with_digit(dupename, refname):
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return False
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if is_same_with_digit(refname, dupename):
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return True
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return len(dupe.path.parts) > len(ref.path.parts)
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@staticmethod
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def get_scan_options():
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"""Returns a list of scanning options for this scanner.
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Returns a list of ``ScanOption``.
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"""
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raise NotImplementedError()
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def get_dupe_groups(self, files, ignore_list=None, j=job.nulljob):
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for f in (f for f in files if not hasattr(f, "is_ref")):
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f.is_ref = False
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files = remove_dupe_paths(files)
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logging.info("Getting matches. Scan type: %d", self.scan_type)
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matches = self._getmatches(files, j)
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logging.info("Found %d matches" % len(matches))
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j.set_progress(100, tr("Almost done! Fiddling with results..."))
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# In removing what we call here "false matches", we first want to remove, if we scan by
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# folders, we want to remove folder matches for which the parent is also in a match (they're
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# "duplicated duplicates if you will). Then, we also don't want mixed file kinds if the
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# option isn't enabled, we want matches for which both files exist and, lastly, we don't
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# want matches with both files as ref.
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if self.scan_type == ScanType.FOLDERS and matches:
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allpath = {m.first.path for m in matches}
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allpath |= {m.second.path for m in matches}
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sortedpaths = sorted(allpath)
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toremove = set()
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last_parent_path = sortedpaths[0]
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for p in sortedpaths[1:]:
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if last_parent_path in p.parents:
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toremove.add(p)
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else:
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last_parent_path = p
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matches = [m for m in matches if m.first.path not in toremove or m.second.path not in toremove]
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if not self.mix_file_kind:
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matches = [m for m in matches if get_file_ext(m.first.name) == get_file_ext(m.second.name)]
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if self.include_exists_check:
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matches = [m for m in matches if m.first.exists() and m.second.exists()]
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# Contents already handles ref checks, other scan types might not catch during scan
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if self.scan_type != ScanType.CONTENTS:
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matches = [m for m in matches if not (m.first.is_ref and m.second.is_ref)]
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if ignore_list:
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matches = [m for m in matches if not ignore_list.are_ignored(str(m.first.path), str(m.second.path))]
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logging.info("Grouping matches")
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groups = engine.get_groups(matches)
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if self.scan_type in {
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ScanType.FILENAME,
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ScanType.FIELDS,
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ScanType.FIELDSNOORDER,
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ScanType.TAG,
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}:
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matched_files = dedupe([m.first for m in matches] + [m.second for m in matches])
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self.discarded_file_count = len(matched_files) - sum(len(g) for g in groups)
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else:
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# Ticket #195
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# To speed up the scan, we don't bother comparing contents of files that are both ref
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# files. However, this messes up "discarded" counting because there's a missing match
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# in cases where we end up with a dupe group anyway (with a non-ref file). Because it's
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# impossible to have discarded matches in exact dupe scans, we simply set it at 0, thus
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# bypassing our tricky problem.
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# Also, although ScanType.FuzzyBlock is not always doing exact comparisons, we also
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# bypass ref comparison, thus messing up with our "discarded" count. So we're
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# effectively disabling the "discarded" feature in PE, but it's better than falsely
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# reporting discarded matches.
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self.discarded_file_count = 0
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groups = [g for g in groups if any(not f.is_ref for f in g)]
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logging.info("Created %d groups" % len(groups))
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for g in groups:
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g.prioritize(self._key_func, self._tie_breaker)
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return groups
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match_similar_words = False
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min_match_percentage = 80
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mix_file_kind = True
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scan_type = ScanType.FILENAME
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scanned_tags = {"artist", "title"}
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size_threshold = 0
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large_size_threshold = 0
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big_file_size_threshold = 0
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word_weighting = False
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include_exists_check = True
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