This change is an initial step to adding support for profiles in x52d.
This will allow the user to create a keyboard layout in an easy to
read/write text based format, and have it compiled into a flat layout
that's easy for the daemon to parse and load into memory. This layout
can then be used to map a user's action key to the actual input usage
needed. This is necessary, because keyboards don't actually send the
character that is typed, but just the position on the keyboard. For
example, on a French AZERTY keyboard, the A key would actually send the
usage for `Keyboard_q_and_Q`. The OS would translate that into the
letter 'a' (or 'A' if Shift key is held) and pass that to the active
window.
This commit adds the full logic necessary for the layout loading,
validation and compiling, as well as tests for the compiler and loader.
For some reason, the CI runs on Github Actions block the macOS runners,
and they take forever to run the tests. The tests are really needed only
on Linux, and the errno values that it uses are only verified to work on
Linux.
This change adds an automated test harness that will spin up an instance
of the X52 daemon, connect to its command socket, send commands and
validate the responses. This first set of test cases simply validates
the basic configuration file handling. Subsequent commits will enhance
the tests to improve code coverage.
nirenjan