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// file : butl/filesystem -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUTL_FILESYSTEM
#define BUTL_FILESYSTEM
#include <sys/types.h> // mode_t
#ifndef _WIN32
# include <dirent.h> // DIR, struct dirent, *dir()
#endif
#include <cstddef> // ptrdiff_t
#include <utility> // move()
#include <iterator>
#include <butl/path>
#include <butl/timestamp>
namespace butl
{
// Return timestamp_nonexistent if the entry at the specified path
// does not exist or is not a path. All other errors are reported
// by throwing std::system_error. Note that this function resolves
// symlinks.
//
timestamp
file_mtime (const path&);
// Return true if the path is to an existing directory. Note that
// this function resolves symlinks.
//
bool
dir_exists (const path&);
// Return true if the path is to an existing regular file. Note that
// this function resolves symlinks.
//
bool
file_exists (const path&);
// Try to create a directory unless it already exists. If you expect
// the directory to exist and performance is important, then you
// should first call dir_exists() above since that's what this
// implementation will do to make sure the path is actually a
// directory.
//
// You should also probably use the default mode 0777 and let the
// umask mechanism adjust it to the user's preferences.
//
// Errors are reported by throwing std::system_error.
//
enum class mkdir_status {success, already_exists};
mkdir_status
try_mkdir (const path&, mode_t = 0777);
// Try to remove the directory returning not_exist if it does not
// exist and not_empty if it is not empty. All other errors are
// reported by throwing std::system_error.
//
enum class rmdir_status {success, not_exist, not_empty};
rmdir_status
try_rmdir (const path&);
// Try to remove the file (or symlinks) returning not_exist if
// it does not exist. All other errors are reported by throwing
// std::system_error.
//
enum class rmfile_status {success, not_exist};
rmfile_status
try_rmfile (const path&);
// Directory entry iteration.
//
enum class entry_type
{
unknown,
regular,
directory,
symlink,
other
};
class dir_entry
{
public:
typedef butl::path path_type;
entry_type
type () const;
// Symlink target type in case of the symlink, type() otherwise.
//
entry_type
ltype () const;
// Entry path (excluding the base). To get the full path, do
// base () / path ().
//
const path_type&
path () const {return p_;}
const dir_path&
base () const {return b_;}
dir_entry () = default;
dir_entry (entry_type t, path_type p, dir_path b)
: t_ (t), p_ (std::move (p)), b_ (std::move (b)) {}
private:
entry_type
type (bool link) const;
private:
friend class dir_iterator;
mutable entry_type t_ = entry_type::unknown; // Lazy evaluation.
mutable entry_type lt_ = entry_type::unknown; // Lazy evaluation.
path_type p_;
dir_path b_;
};
class dir_iterator
{
public:
typedef dir_entry value_type;
typedef const dir_entry* pointer;
typedef const dir_entry& reference;
typedef std::ptrdiff_t difference_type;
typedef std::input_iterator_tag iterator_category;
~dir_iterator ();
dir_iterator () = default;
explicit
dir_iterator (const dir_path&);
dir_iterator (const dir_iterator&) = delete;
dir_iterator& operator= (const dir_iterator&) = delete;
dir_iterator (dir_iterator&& x);
dir_iterator& operator= (dir_iterator&&);
dir_iterator& operator++ () {next (); return *this;}
reference operator* () const {return e_;}
pointer operator-> () const {return &e_;}
friend bool operator== (const dir_iterator&, const dir_iterator&);
friend bool operator!= (const dir_iterator&, const dir_iterator&);
private:
void
next ();
private:
dir_entry e_;
#ifndef _WIN32
DIR* h_ {nullptr};
#else
// Check move implementation.
//
# error Win32 implementation lacking
#endif
};
// Range-based for loop support.
//
// for (const auto& de: dir_iterator (dir_path ("/tmp"))) ...
//
// Note that the "range" (which is the "begin" iterator), is no
// longer usable. In other words, don't do this:
//
// dir_iterator i (...);
// for (...: i) ...
// ++i; // Invalid.
//
inline dir_iterator begin (dir_iterator& i) {return std::move (i);}
inline dir_iterator end (const dir_iterator&) {return dir_iterator ();}
}
#include <butl/filesystem.ixx>
#endif // BUTL_FILESYSTEM
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