filesys.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
 
#pragma once
 
#include "config.h"
#include <string>
#include <string_view>
#include <vector>
#include <fstream>
 
#ifdef _WIN32
#define DIR_DELIM "\\"
#define DIR_DELIM_CHAR '\\'
#define FILESYS_CASE_INSENSITIVE true
#define PATH_DELIM ";"
#else
#define DIR_DELIM "/"
#define DIR_DELIM_CHAR '/'
// FIXME: the idea that "all filesystem on an UNIX system are case-sensitive"
// is very wrong. Different folders on the same filesystem can even have differing
// case-sensitivity. This seems tough to handle correctly however.
#define FILESYS_CASE_INSENSITIVE false
#define PATH_DELIM ":"
#endif
 
namespace io {
class IFileSystem;
}
 
namespace fs
{
 
struct DirListNode
{
        std::string name;
        bool dir;
};
 
[[nodiscard]]
std::vector<DirListNode> GetDirListing(const std::string &path);
 
// Returns true if already exists
bool CreateDir(const std::string &path);
 
[[nodiscard]] bool PathExists(const std::string &path);
 
[[nodiscard]] bool IsPathAbsolute(const std::string &path);
 
[[nodiscard]] bool IsDir(const std::string &path);
 
[[nodiscard]] bool IsExecutable(const std::string &path);
 
[[nodiscard]] bool IsFile(const std::string &path);
 
[[nodiscard]] inline bool IsDirDelimiter(char c)
{
        return c == '/' || c == DIR_DELIM_CHAR;
}
 
// Only pass full paths to this one. returns true on success.
bool RecursiveDelete(const std::string &path);
 
bool DeleteSingleFileOrEmptyDirectory(const std::string &path, bool log_error = false);

[[nodiscard]] std::string TempPath();

[[nodiscard]] std::string CreateTempFile();

[[nodiscard]] std::string CreateTempDir();
 
/* Returns a list of subdirectories, including the path itself, but excluding
       hidden directories (whose names start with . or _)
*/
void GetRecursiveDirs(std::vector<std::string> &dirs, const std::string &dir);
 
[[nodiscard]]
std::vector<std::string> GetRecursiveDirs(const std::string &dir);
 
/* The path itself not included, returns a list of all subpaths.
   dst - vector that contains all the subpaths.
   list files - include files in the list of subpaths.
   ignore - paths that start with one of these characters will not be listed.
*/
void GetRecursiveSubPaths(const std::string &path,
                std::vector<std::string> &dst,
                bool list_files,
                std::string_view ignore = {});
 
// Create all directories on the given path that don't already exist.
bool CreateAllDirs(const std::string &path);
 
// Copy a regular file
bool CopyFileContents(const std::string &source, const std::string &target);
 
// Copy directory and all subdirectories
// Omits files and subdirectories that start with a period
bool CopyDir(const std::string &source, const std::string &target);
 
// Move directory and all subdirectories
// Behavior with files/subdirs that start with a period is undefined
bool MoveDir(const std::string &source, const std::string &target);
 
// Check if two paths are the same
// Ignores case differences and '/' vs. '\\' on Windows
bool PathsEqual(const std::string &p1, const std::string &p2);
 
// Check if one path is prefix of another
// For example, "/tmp" is a prefix of "/tmp" and "/tmp/file" but not "/tmp2"
// Ignores case differences and '/' vs. '\\' on Windows
bool PathStartsWith(const std::string &path, const std::string &prefix);
 
// If child is (as absolute path) inside parent (also as absolute path), returns
// the part of child that is relative to parent.
// Symlinks and "." and ".." components are removed.
// If child and parent are (absolute) the same, the result is ".". (Otherwise it
// never starts with '.'.)
// Returns "" if child is not in parent, also returns "" on failure.
std::string MakePathRelativeTo(const std::string &child, const std::string &parent);
 
// Remove last path component and the dir delimiter before and/or after it.
// If there's only one path component it will refuse to remove it (if absolute)
// or return "" (if relative).
// removed: If non-NULL, receives the removed components
// count: Number of components to remove
std::string RemoveLastPathComponent(const std::string &path,
                std::string *removed = nullptr, int count = 1);
 
// Remove "." and ".." path components and for every ".." removed, remove
// the last normal path component before it. Unlike AbsolutePath,
// this does not resolve symlinks and check for existence of directories.
std::string RemoveRelativePathComponents(std::string path);
 
// Returns the absolute path for the passed path, with "." and ".." path
// components and symlinks removed.  Returns "" on error.
[[nodiscard]]
std::string AbsolutePath(const std::string &path);
 
// This is a combination of RemoveRelativePathComponents() and AbsolutePath()
// It will resolve symlinks for the leading path components that exist and
// still remove "." and ".." in the rest of the path.
// Returns "" on error.
[[nodiscard]]
std::string AbsolutePathPartial(const std::string &path);
 
// Returns the filename from a path or the entire path if no directory
// delimiter is found.
[[nodiscard]]
const char *GetFilenameFromPath(const char *path);
 
// Replace the content of a file on disk in a way that is safe from
// corruption/truncation on a crash.
// logs and returns false on error
bool safeWriteToFile(const std::string &path, std::string_view content);
 
#if IS_CLIENT_BUILD
bool extractZipFile(io::IFileSystem *fs, const char *filename, const std::string &destination);
#endif
 
bool ReadFile(const std::string &path, std::string &out, bool log_error = false);
 
bool Rename(const std::string &from, const std::string &to);

bool OpenStream(std::filebuf &stream, const char *filename,
        std::ios::openmode mode, bool log_error, bool log_warn);
 
} // namespace fs
 
// outside of namespace for convenience:

[[nodiscard]]
inline std::ofstream open_ofstream(const char *name, bool log,
        std::ios::openmode mode = std::ios::openmode())
{
        mode |= std::ios::out | std::ios::binary;
        if (!(mode & std::ios::app))
                mode |= std::ios::trunc;
        std::ofstream ofs;
        if (!fs::OpenStream(*ofs.rdbuf(), name, mode, log, false))
                ofs.setstate(std::ios::failbit);
        return ofs;
}

[[nodiscard]]
inline std::ifstream open_ifstream(const char *name, bool log,
        std::ios::openmode mode = std::ios::openmode())
{
        mode |= std::ios::in | std::ios::binary;
        std::ifstream ifs;
        if (!fs::OpenStream(*ifs.rdbuf(), name, mode, log, false))
                ifs.setstate(std::ios::failbit);
        return ifs;
}