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CC-Tweaked/doc/events/key.md
Jonathan Coates e1e7ef59c6 Measure code coverage from in-game tests
More importantly, `./gradlew check' actually runs the in-game tests,
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module: [kind=event] key

This event is fired when any key is pressed while the terminal is focused.

This event returns a numerical "key code" (for instance, F1 is 290). This value may vary between versions and so it is recommended to use the constants in the @{keys} API rather than hard coding numeric values.

If the button pressed represented a printable character, then the @{key} event will be followed immediately by a @{char} event. If you are consuming text input, use a @{char} event instead!

Return values

  1. [string]: The event name.
  2. [number]: The numerical key value of the key pressed.
  3. [boolean]: Whether the key event was generated while holding the key (@{true}), rather than pressing it the first time (@{false}).

Example

Prints each key when the user presses it, and if the key is being held.

while true do
  local event, key, is_held = os.pullEvent("key")  
  print(("%s held=%s"):format(keys.getName(key), is_held))
end