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# XDG Base Directory Standard
The 2.0 API is much a great deal more concise than the original
0.0+ and 1.0+ APIs. It consists primarily of a single
interface method `XDG[]`. Yet all the functionality of the older
API remain and then some.
First we need to require the library.
require 'xdg'
In the applique we have setup a fake root directory with
coorepsonding environment settings to use as test fixtures.
## Data Paths
### Home
XDG['DATA_HOME'].environment.assert == ENV['XDG_DATA_HOME'].to_s
XDG['DATA_HOME'].environment_variables.assert == ['XDG_DATA_HOME']
Looking at the data home location by default it should be point to
our joe user's home directory under `.local/share`.
XDG['DATA_HOME'].to_a.assert == [$froot + 'home/joe/.local/share']
### Dirs
XDG['DATA_DIRS'].environment.assert == ENV['XDG_DATA_DIRS'].to_s
XDG['DATA_DIRS'].environment_variables.assert == ['XDG_DATA_DIRS']
Looking at the system data locations
XDG['DATA_DIRS'].to_a.assert == [$froot + 'usr/share']
### Combined
XDG['DATA'].environment_variables.assert == ['XDG_DATA_HOME', 'XDG_DATA_DIRS']
Lookking at both data location combined
XDG['DATA'].to_a.assert == [$froot + 'home/joe/.local/share', $froot + 'usr/share']
## Config Paths
### Home
XDG['CONFIG_HOME'].environment.assert == ENV['XDG_CONFIG_HOME'].to_s
XDG['CONFIG_HOME'].to_a.assert == [$froot + 'home/joe/.config']
### Dirs
XDG['CONFIG_DIRS'].environment.assert == ENV['XDG_CONFIG_DIRS'].to_s
XDG['CONFIG_DIRS'].to_a.assert == [$froot + 'etc/xdg', $froot + 'etc']
### Combined
XDG['CONFIG'].to_a.assert == [$froot + 'home/joe/.config', $froot + 'etc/xdg', $froot + 'etc']
## Cache Paths
### Home
XDG['CACHE_HOME'].environment.assert == ENV['XDG_CACHE_HOME'].to_s
XDG['CACHE_HOME'].to_a.assert == [$froot + 'home/joe/.cache']
### Dirs
XDG['CACHE_DIRS'].environment.assert == ENV['XDG_CACHE_DIRS'].to_s
XDG['CACHE_DIRS'].to_a.assert == [$froot + 'tmp']
### Combined
XDG['CACHE'].to_a.assert == [$froot + 'home/joe/.cache', $froot + 'tmp']
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