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@node XDG Base Directory
@section XDG Base Directory
Implementation of the XDG Base Directory Specification
@url{https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html}, v0.8.
It's recommended to include this module with a symbol prefix:
@example
(use-modules ((xdg basedir) :prefix xdg-)
(xdg-data-dirs)
⇒ ("/usr/local/share" "/usr/share")
@end example
The users home directory is fetched from the environment variable @env{HOME}.
@defun data-home
@findex XDG_DATA_HOME
@env{XDG_DATA_HOME}, usually @file{~/.local/share}.
@end defun
@defun config-home
@findex XDG_CONFIG_HOME
@env{XDG_CONFIG_HOME}, usually @file{~/.config}.
@end defun
@defun state-home
@findex XDG_STATE_HOME
@env{XDG_STATE_HOME}, usually @file{~/.local/state}.
@end defun
@defun data-dirs
@findex XDG_DATA_DIRS
@env{XDG_DATA_DIRS}, split into a list.
Defaults to @code{("/usr/local/share" "/usr/share")}.
@end defun
@defun config-dirs
@findex XDG_CONFIG_DIRS
@env{XDG_CONFIG_DIRS} as a list, usually @code{("/etc/xdg")}.
Defaults to @file{/etc/xdg}.
@end defun
@defun cache-home
@findex XDG_CACHE_HOME
@env{XDG_CACHE_HOME}, usually @file{~/.cache}.
@end defun
@defun runtime-dir
@findex XDG_RUNTIME_DIR
If @env{XDG_RUNTIME_DIR} is set, than that is used. Otherwise a
warning message is printed to stderr and @file{/tmp} is returned.
The standard also stipulates a few things about permissons for this
directory. These are currently not checked.
Systemd usually sets this value to @file{/run/user/$(id -u)}.
@end defun
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