Key Mapper

A tool to change and program the mapping of your input device buttons.

Usage

To open the UI to modify the mappings, look into your applications menu and search for 'Key Mapper' in settings. You can also start it via key-mapper-gtk. It works with both Wayland and X11.

If stuff doesn't work, check the output of key-mapper-gtk -d and feel free to open up an issue here.

Macros

It is possible to write timed macros into the center column:

k(1).k(2) 1, 2
r(3, k(a).w(500)) a, a, a with 500ms pause
m(Control_L, k(a).k(x)) CTRL + a, CTRL + x

Documentation:

r repeats the execution of the second parameter
w waits in milliseconds
k writes a single keystroke
m holds a modifier while executing the second parameter
. executes two actions behind each other

Syntax errors are logged to the console.

Names

For a list of supported keystrokes and their names for the middle column, check the output of xmodmap -pke

Alphanumeric a to z and 0 to 9
Modifiers Alt_L Control_L Control_R Shift_L Shift_R

If you can't find what you need, consult linux/input-event-codes.h for KEY and BTN names

Mouse buttons BTN_LEFT BTN_RIGHT BTN_MIDDLE BTN_SIDE ...
Multimedia keys KEY_NEXTSONG KEY_PLAYPAUSE ...
Macro special keys KEY_MACRO1 KEY_MACRO2 ...

Gamepads

Tested with the XBOX 360 Gamepad.

Joystick movements will be translated to mouse movements
The second joystick acts as a mouse wheel
Buttons can be mapped to keycodes or macros
The D-Pad only works as two buttons - horizontal and vertical

Installation

The tool shows and logs if there are issues, but usually, independent of the method, you should add yourself to the input and plugdev groups so that you can read information from your devices. You have to start the application via sudo otherwise. You may also need to grant yourself write access to /dev/uinput to be able to inject your programmed mapping.

# either use sudo key-mapper-gtk or
sudo usermod -a -G plugdev,input $USER
sudo setfacl -m u:$USER:rw- /dev/uinput
# log out and back in or restart, the two groups should be visible with:
groups

Manjaro/Arch

pacaur -S key-mapper-git

Ubuntu/Debian

wget "https://github.com/sezanzeb/key-mapper/releases/"\
"download/0.2.0/python3-key-mapper_0.2.0-1_all.deb"
sudo dpkg -i python3-key-mapper_0.2.0-1_all.deb

Git/pip

Depending on your distro, maybe you need to use both methods with --force to get all your files properly in place and overwrite a previous installation of key-mapper.

# method 1
sudo pip install git+https://github.com/sezanzeb/key-mapper.git
# method 2
git clone https://github.com/sezanzeb/key-mapper.git
cd key-mapper && sudo python3 setup.py install

Roadmap

show a dropdown to select valid devices
creating presets per device
renaming presets
show a mapping table
make that list extend itself automatically
read keycodes with evdev
inject the mapping
keep the system defaults for unmapped buttons
button to stop mapping and using system defaults
highlight changes and alert before discarding unsaved changes
automatically load presets on login for plugged in devices
make sure it works on wayland
support timed macros, maybe using some sort of syntax
add to the AUR, provide .deb file
basic support for gamepads as keyboard and mouse combi
map D-Pad and Joystick directions as buttons, joystick purpose via config
automatically load presets when devices get plugged in after login
option to write hwdb configs for lower level mappings (Remapping keys using hwdb files)
mapping a combined button press to a key
executing a macro while holding down the key

Tests

pylint keymapper --extension-pkg-whitelist=evdev
sudo pip install . && coverage run tests/test.py
coverage combine && coverage report -m

To read events, evtest is very helpful. Add -d to key-mapper-gtk to get debug outbut.

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