// Returns the single base directory relative to which user-specific data files
// should be written, which is defined by $XDG_DATA_HOME. If $XDG_DATA_HOME is
// either not set or empty, a default equal to $HOME/.local/share is used.
// 
// The memory is statically allocated and must not be free'd. It may be
// overwritten later, so use [[strings::dup]] to extend its lifetime.
export fn data_home (prog: str = "") str = {
	// TODO
};

// Returns the single base directory relative to which user-specific
// configuration files should be written, which is defined by $XDG_CONFIG_HOME.
// If $XDG_CONFIG_HOME is either not set or empty, a default equal to
// $HOME/.config is used.
// 
// The memory is statically allocated and must not be free'd. It may be
// overwritten later, so use [[strings::dup]] to extend its lifetime.s
export fn config_home (prog: str = "") str = {
	// TODO
};

// Returns the single base directory relative to which user-specific state data
// that should persist between (application) restarts, but that is not important
// or portable enough to the user that it should be stored. It is defined by
// $XDG_STATE_HOME. It may contain:
// 
// - actions history (logs, history, recently used files, …)
// - current state of the application that can be reused on a restart (view,
//   layout, open files, undo history, …)
//
// The memory is statically allocated and must not be free'd. It may be
// overwritten later, so use [[strings::dup]] to extend its lifetime.
export fn state_home (prog: str = "") str = {
	// TODO
};

// CacheHome returns the single base directory relative to which user-specific
// non-essential (cached) data should be written, which is defined by
// $XDG_CACHE_HOME. If $XDG_CACHE_HOME is either not set or empty, a default
// equal to $HOME/.cache is used.
// 
// The memory is statically allocated and must not be free'd. It may be
// overwritten later, so use [[strings::dup]] to extend its lifetime.
export fn cache_home (prog: str = "") str = {
	// TODO
};

// Returns the single base directory relative to which user-specific runtime
// files and other file objects should be placed, which is defined by
// $XDG_RUNTIME_DIR. This module does not provide a fallback directory. If this
// function returns an error, applications should fall back to a replacement
// directory with similar capabilities (in accordance with §3) and print a
// warning message.
// 
// The memory is statically allocated and must not be free'd. It may be
// overwritten later, so use [[strings::dup]] to extend its lifetime.
export fn runtime_dir (prog: str = "") str = {
	// TODO
};

// Returns the set of preference ordered base directories relative to which data
// files should be searched, which is defined by $XDG_DATA_DIRS. If
// $XDG_DATA_DIRS is either not set or empty, a value equal to
// /usr/local/share/:/usr/share/ is used. It is reccomended to call [[data_all]]
// instead for most use cases.
// 
// The memory is statically allocated and must not be free'd. It may be
// overwritten later, so use [[strings::dup]] to extend its lifetime.
export fn data_dirs (prog: str = "") []str = {
	// TODO
};

// Returns set of preference ordered base directories relative to which
// configuration files should be searched, which is defined by $XDG_CONFIG_DIRS.
// If $XDG_CONFIG_DIRS is either not set or empty, a value equal to /etc/xdg is
// used. It is reccomended to call [[config_all]] instead for most use cases.
//
// The memory is statically allocated and must not be free'd. It may be
// overwritten later, so use [[strings::dup]] to extend its lifetime.
export fn config_dirs (prog: str = "") []str = {
	// TODO
};

// Returns the result of [[data_home]] in front of [[data_dirs]].
// 
// The memory is statically allocated and must not be free'd. It may be
// overwritten later, so use [[strings::dup]] to extend its lifetime.
export fn data_all (prog: str = "") []str = {
	// TODO
};

// Returns the result of [[config_home]] in front of [[config_dirs]].
// 
// The memory is statically allocated and must not be free'd. It may be
// overwritten later, so use [[strings::dup]] to extend its lifetime.
export fn config_all (prog: str = "") []str = {
	// TODO
};