### Install as a systemd service

Source: https://github.com/wez/evremap/blob/master/README.md

Deploy the provided service unit file and enable it via systemctl.

```console
$ sudo cp evremap.service /usr/lib/systemd/system/
$ sudo systemctl daemon-reload
$ sudo systemctl enable evremap.service
$ sudo systemctl start evremap.service
```

--------------------------------

### Start OpenRC service

Source: https://github.com/wez/evremap/blob/master/README.md

Manually starts the evremap service.

```console
rc-service evremap start
```

--------------------------------

### Build evremap from source

Source: https://github.com/wez/evremap/blob/master/README.md

Install required system dependencies and compile the project using cargo.

```console
$ sudo dnf install libevdev-devel # redhat/centos
## or
$ sudo apt install libevdev-dev pkg-config # debian/ubuntu

$ cargo build --release
```

--------------------------------

### Configure as a Runit service

Source: https://github.com/wez/evremap/blob/master/README.md

Set up a Runit service directory and run script for evremap.

```console
sudo mkdir /etc/sv/evremap
sudo touch /etc/sv/evremap/run
```

```sh
#!/bin/sh
set -e 
exec <PATH_TO_EVREMAP> remap <CONFIG>
```

```console
sudo ln -s /etc/sv/evremap /var/service
```

--------------------------------

### Enable OpenRC service

Source: https://github.com/wez/evremap/blob/master/README.md

Adds the evremap service to the default runlevel.

```console
rc-update add evremap
```

--------------------------------

### Make service file executable

Source: https://github.com/wez/evremap/blob/master/README.md

Sets the execution permissions for the newly created init script.

```console
chmod +x /etc/init.d/evremap
```

--------------------------------

### Create OpenRC service file

Source: https://github.com/wez/evremap/blob/master/README.md

Defines the service configuration for evremap using supervise-daemon.

```console
#!/usr/bin/openrc-run

supervisor=supervise-daemon
command="<PATH_TO_EVREMAP>"
command_args="remap <CONFIG>"
```

--------------------------------

### CLI Commands for Device and Key Discovery

Source: https://github.com/wez/evremap/blob/master/README.md

Commands to identify input devices and available key codes for configuration.

```bash
sudo evremap list-devices
```

```bash
evremap list-keys
```

--------------------------------

### Run evremap

Source: https://github.com/wez/evremap/blob/master/README.md

Execute the remapper with root privileges to ensure exclusive access to input devices.

```console
$ sudo target/release/evremap remap my-config-file.toml
```

--------------------------------

### Configure Ordered Remapping Rules

Source: https://github.com/wez/evremap/blob/master/README.md

Demonstrates how rule ordering affects output when multiple mappings overlap.

```toml
[[remap]]
input = ["KEY_LEFTALT", "KEY_F8"]
# When our `input` is matched, our list of `output` is prevented from
# matching as the `input` of subsequent rules.
output = ["KEY_F8"]

[[remap]]
input = ["KEY_F8"]
output = ["KEY_MUTE"]
```

--------------------------------

### Define Simple Key Remappings

Source: https://github.com/wez/evremap/blob/master/README.md

Maps specific key combinations to different output keys.

```toml
# This config snippet is useful if your keyboard has an arrow
# cluster, but doesn't have page up, page down, home or end
# keys.  Here we're configuring ALT+arrow to map to those functions.
[[remap]]
input = ["KEY_LEFTALT", "KEY_UP"]
output = ["KEY_PAGEUP"]

[[remap]]
input = ["KEY_LEFTALT", "KEY_DOWN"]
output = ["KEY_PAGEDOWN"]

[[remap]]
input = ["KEY_LEFTALT", "KEY_LEFT"]
output = ["KEY_HOME"]

[[remap]]
input = ["KEY_LEFTALT", "KEY_RIGHT"]
output = ["KEY_END"]
```

--------------------------------

### Configure user permissions for input devices

Source: https://github.com/wez/evremap/blob/master/README.md

Grant unprivileged users access to evdev and uinput devices via udev rules.

```console
sudo gpasswd -a YOUR_USER input
echo 'KERNEL=="uinput", GROUP="input"' | sudo tee /etc/udev/rules.d/input.rules
```

```console
echo 'KERNEL=="event*", NAME="input/%k", MODE="660", GROUP="input"' | sudo tee /etc/udev/rules.d/input.rules
```

--------------------------------

### Configure Dual Role Keys

Source: https://github.com/wez/evremap/blob/master/README.md

Defines a key that acts as one input when tapped and another when held.

```toml
# The name of the device to remap.
# Run `sudo evremap list-devices` to see the devices available
# on your system.
device_name = "AT Translated Set 2 keyboard"

# If you have multiple devices with the same name, you can optionally
# specify the `phys` value that is printed by the `list-devices` subcommand
# phys = "usb-0000:07:00.3-2.1.1/input0"

# Configure CAPSLOCK as a Dual Role key.
# Holding it produces LEFTCTRL, but tapping it
# will produce ESC.
# Both `tap` and `hold` can expand to multiple output keys.
[[dual_role]]
input = "KEY_CAPSLOCK"
hold = ["KEY_LEFTCTRL"]
tap = ["KEY_ESC"]
```

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