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#pragma once
#include "fts.h"
#include <util/system/error.h>
#include <util/generic/ptr.h>
#include <util/generic/iterator.h>
#include <util/generic/yexception.h>
/// Note this magic API traverses directory hierarchy
class TDirIterator: public TInputRangeAdaptor<TDirIterator> {
struct TFtsDestroy {
static inline void Destroy(FTS* f) noexcept {
yfts_close(f);
}
};
public:
class TError: public TSystemError {
public:
inline TError(int err)
: TSystemError(err)
{
}
};
using TCompare = int (*)(const FTSENT**, const FTSENT**);
struct TOptions {
inline TOptions() {
Init(FTS_PHYSICAL);
}
inline TOptions(int opts) {
Init(opts);
}
inline TOptions& SetMaxLevel(size_t level) noexcept {
MaxLevel = level;
return *this;
}
inline TOptions& SetSortFunctor(TCompare cmp) noexcept {
Cmp = cmp;
return *this;
}
TOptions& SetSortByName() noexcept;
int FtsOptions;
size_t MaxLevel;
TCompare Cmp;
private:
inline void Init(int opts) noexcept {
FtsOptions = opts | FTS_NOCHDIR;
MaxLevel = Max<size_t>();
Cmp = nullptr;
}
};
inline TDirIterator(const TString& path, const TOptions& options = TOptions())
: Options_(options)
, Path_(path)
{
Trees_[0] = Path_.begin();
Trees_[1] = nullptr;
FileTree_.Reset(yfts_open(Trees_, Options_.FtsOptions, Options_.Cmp));
if (!FileTree_.Get() || FileTree_->fts_cur->fts_link->fts_errno) {
ythrow TError(FileTree_.Get() ? FileTree_->fts_cur->fts_link->fts_errno : LastSystemError()) << "can not open '" << Path_ << "'";
}
}
inline FTSENT* Next() {
FTSENT* ret = yfts_read(FileTree_.Get());
if (ret) {
if ((size_t)(ret->fts_level + 1) > Options_.MaxLevel) {
yfts_set(FileTree_.Get(), ret, FTS_SKIP);
}
} else {
const int err = LastSystemError();
if (err) {
ythrow TError(err) << "error while iterating " << Path_;
}
}
return ret;
}
inline void Skip(FTSENT* ent) {
yfts_set(FileTree_.Get(), ent, FTS_SKIP);
}
private:
TOptions Options_;
TString Path_;
char* Trees_[2];
THolder<FTS, TFtsDestroy> FileTree_;
};
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