Implement an emit command (#4937)

[Tert0]

Closes #4937

Command Syntax: emit <press|release|press-release> <criteria> <keys>

Parameters

• action: specifies whether to press, release the keys or do both
• criteria: first window that matches the criteria will get the key input
• keys: modifiers and keys separated by +

Examples

• emit press-release [app_id=com.obsproject.Studio] ALT+F8
• bindsym --no-repeat Ctrl+T emit press [app_id=wev] Ctrl+A
• bindsym --no-repeat --release Ctrl+T emit release [app_id=wev] Ctrl+A

Test

1. Open wev -f wl_keyboard with a terminal
2. Move the wev window into another workspace
3. Run

swaymsg 'bindsym --no-repeat Ctrl+T emit press [app_id=wev] Ctrl+A'
swaymsg 'bindsym --no-repeat --release Ctrl+T emit release [app_id=wev] Ctrl+A'

4. Press and hold Ctrl+T
   -> The terminal running wev should show that Ctrl+A was pressed
5. Release Ctrl+T
   -> The terminal running wev should show that Ctrl+A was released

Code Structure

I am not sure if I should move the code (for converting xkb keysym to key codes), that I copied from the sway/commands/bind.c, to common/utils.c or maybe somewhere else.