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Switched the history from using the XDG_CACHE_HOME directory by default
to use XDG_STATE_HOME by default.
This makes sense since cache can (and should be prepared to) be wiped at
any moment and the program functionality should not be hindered by this.
Since we need to retain history through such wipes the newly introduced
state directory is the perfect match for keeping the history file in.
This does constitute a breaking change for existing histories which need
to be moved to the new directory if they made use of the old cache
directory.
Concurrent with this we are renaming `XDG_CACHE_LOCATION` environment
variable to `XDG_HISTORY_LOCATION` so this is a second breaking change
for those using a custom location for their histories.
This change attempts to make the naming scheme coherent and remove some
left-over naming cruft from the old location being the cache directory.
This provides one of the larger changes to the program so far.
Fixes #5.
Added a simple test for each of the base command options: echo, type,
clip. It uses custom commands set through environment options so does
not yet test the actual default command logic (finding a typer,
clipper), that is still a TODO.
Also split tests into tests concerning commands of the program and tests
concerning the directory settings and options of the program, to avoid
ending up with a single test file spanning hundreds of lines.
Marty Oehme