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LibCore: Introduce a new directory iteration API
`Core::Directory::for_each_entry()` takes a callback which is passed the DirectoryEntry and the parent Directory. It returns any error from creating the iterator, iterating the entries, or returned from the callback. As a simple example, this: ```c++ Core::DirIterator piece_set_iterator { "/res/icons/chess/sets/", Core::DirIterator::SkipParentAndBaseDir }; while (piece_set_iterator.has_next()) m_piece_sets.append(piece_set_iterator.next_path()); ``` becomes this: ```c++ TRY(Core::Directory::for_each_entry("/res/icons/chess/sets/"sv, Core::DirIterator::SkipParentAndBaseDir, [&](auto const& entry, auto&) -> ErrorOr<IterationDecision> { TRY(m_piece_sets.try_append(entry.name)); return IterationDecision::Continue; })); ```
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ceaed7440e
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2 changed files with 37 additions and 2 deletions
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@ -93,4 +93,32 @@ ErrorOr<struct stat> Directory::stat() const
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return System::fstat(m_directory_fd);
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}
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ErrorOr<void> Directory::for_each_entry(DirIterator::Flags flags, Core::Directory::ForEachEntryCallback callback)
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{
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DirIterator iterator { path().string(), flags };
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if (iterator.has_error())
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return iterator.error();
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while (iterator.has_next()) {
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if (iterator.has_error())
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return iterator.error();
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auto entry = iterator.next();
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if (!entry.has_value())
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break;
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auto decision = TRY(callback(entry.value(), *this));
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if (decision == IterationDecision::Break)
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break;
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}
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return {};
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}
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ErrorOr<void> Directory::for_each_entry(AK::StringView path, DirIterator::Flags flags, Core::Directory::ForEachEntryCallback callback)
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{
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auto directory = TRY(Directory::create(path, CreateDirectories::No));
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return directory.for_each_entry(flags, move(callback));
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}
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}
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