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2in1screen - Zig Style

Basically this is a conversion of the already perfectly fine 2in1screen command into zig (It seems there are so many different repos for this I'm hoping that this is the original one...) because I wanted to do something in zig and this seemed fun.

Differences with original

Other then being written in zig there are a few differences with the original version:

  • Can deal with multihead as this will only rotate the output display configured in the build options (with the disadvantage that there is no option to rotate all screens)

  • Will run a custom script (configured in build options) when the rotation changes, defaults to .xrandr-changed.

    If the script does not exist it will just print an error but recover.

    Example of my .xrandr-changed which deals with rotating touch devices

    #!/usr/bin/env sh

display="eDP-1"
xinput --map-to-output "Wacom HID 48EE Finger touch" $display
xinput --map-to-output "Wacom HID 48EE Pen stylus"   $display
xinput --map-to-output "Wacom HID 48EE Pen eraser"   $display

  • You can now run the script as a one off to rotate your screen, which also includes running the script above. See Usage for more info. Which is useful to make sure if you only want it rotating in tablet mode, it will always rotate back to being upright when going back into desktop mode.

Build Requirements

  • Zig >= 0.11 to be installed
  • xrandr to rotate the screen (have not made it handle wayland soz)
  • find command for running glob pattern matching

Install

git clone https://github.com/WilfSilver/2in1screen
cd 2in1screen

Before we build there are some options you may want to change:

(These options with their defaults can be seen by going zig build --help)

  • display - The display name of your touchscreen (e.g. eDP-1)
  • script - The script to run

Other compile options you may want to experiment with

  • n-state - Should we rotate in all directions or just upside down and upright
  • buffer-size - The size of the buffer we use on the stack, careful not to go too low, should only be changed if the script is erroring out
  • device-location - The directory to search to try and find the iio:device* symlinks

You can then install with these options by going:

zig build install -Doptimize=ReleaseFast -D<option>=<value> -p ~/.local

Which will install it to your ~/.local/bin folder.

NOTE: Sadly this cannot currently compile with ReleaseSmall because issue with running child process.

Usage

Default: Start daemon to listen to accelerator for change and rotate as necessary.

2in1screen &

Stop the daemon

pkill 2in1screen

Rotate the screen back to upright

2in1screen 0

The argument should be an index of ROT: { "normal", "inverted", "right", "left" } for the direction to rotate in.