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LibCore: Introduce a new directory iteration API

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`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;
}));
```
This commit is contained in:
Sam Atkins 2023-03-02 17:01:08 +00:00 • committed by Andreas Kling
parent ceaed7440e
commit 23aec16e8b
2 changed files with 37 additions and 2 deletions
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11
Userland/Libraries/LibCore/Directory.h
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2022, kleines Filmröllchen <filmroellchen@serenityos.org>
* Copyright (c) 2023, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -8,17 +9,19 @@
#include <AK/Error.h>
#include <AK/Format.h>
#include <AK/Function.h>
#include <AK/IterationDecision.h>
#include <AK/LexicalPath.h>
#include <AK/Noncopyable.h>
#include <AK/Optional.h>
#include <LibCore/DirIterator.h>
#include <LibCore/DirectoryEntry.h>
#include <LibCore/File.h>
#include <dirent.h>
#include <sys/stat.h>
namespace Core {
class DirIterator;
// Deal with real system directories. Any Directory instance always refers to a valid existing directory.
class Directory {
AK_MAKE_NONCOPYABLE(Directory);
@ -43,6 +46,10 @@ public:
LexicalPath const& path() const { return m_path; }
using ForEachEntryCallback = Function<ErrorOr<IterationDecision>(DirectoryEntry const&, Directory const& parent)>;
static ErrorOr<void> for_each_entry(StringView path, DirIterator::Flags, ForEachEntryCallback);
ErrorOr<void> for_each_entry(DirIterator::Flags, ForEachEntryCallback);
ErrorOr<void> chown(uid_t, gid_t);
static ErrorOr<bool> is_valid_directory(int fd);