While luajit seems to be the most popular (and fastest) lua
implementation for higher-level implementations, at the system level
it is relatively unused. Lua 5.4 on the other hand is used by other
system-level components like wireplumber and RPM. In the latter case
this means that lua is already available on every rpm-based distro
without further dependencies.
The performance of 5.4 seems to be acceptable and while luajit may be
faster the extra dependency requires more maintenance. Let's only expose
ourselves to that if absolutely needed.
This is not a strict revert because the code has changed a bit since
with several bugfixes deployed on top.
This reverts commit 2723cadaeb.
Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1366>
The existence of the log global was in part due to early (pre-merge)
versions of the Lua plugins supporting multiple libinput plugin objects
per file. This is no longer the case and integrating the log functions
into the (single) libinput object makes the code more obvious (we're
calling libinput:log_debug() now, so it's obviously a libinput log
function) and we no longer mix dot with colon notations.
Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1350>
Injecting frame was the first implementation of adding event frames but
it has since effectively been replaced by append/prepend_frame which are
more predictable and easier to support.
In the Lua API injecting frames was only possible within the timer and
the only real use-case for this is to inject events that are then also
seen by other plugins. But that can be achieved by simply ordering the
plugin before the other plugins and using the append/prepend approach.
Until we have a real use-case for injecting events let's remove the API
so we don't lock ourselves into an API that may not do what it needs to
but needs to be supported for a long time.
Closes: #1210
Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1351>
Because our lua hooks don't expose the device-added callback we need to
cache any calls to disable a feature and then apply it quietly when the
device is actually added. Any other call can go straight through.
Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1249>
This patch adds support for Lua scripts to modify evdev devices and
event frames before libinput sees those events.
Plugins in Lua are sandboxed and restricted in what they can do: no IO,
no network, not much of anything else.
A plugin is notified about a new device before libinput handles it and
it can thus modify that device (changes are passed through to our libevdev
context). A plugin can then also connect an evdev frame handler which
gives it access to the evdev frames before libinput processes them. The
example plugin included shows how to swap left/right mouse buttons:
libinput:register({1})
function frame(device, frame)
for _, v in ipairs(frame.events) do
if v.usage == evdev.BTN_RIGHT then
v.usage = evdev.BTN_LEFT
elseif v.usage == evdev.BTN_LEFT then
v.usage = evdev.BTN_RIGHT
end
end
return frame
end
function device_new(plugin, device)
local usages = device:usages()
if usages[evdev.BTN_LEFT] and usages[evdev.BTN_RIGHT] then
device:connect("evdev-frame", frame)
end
end
libinput:connect("new-evdev-device", device_new)
A few other example plugins are included in this patch
Part-of: <https://gitlab.freedesktop.org/libinput/libinput/-/merge_requests/1192>
