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# Space Cadet Shift: The Future, Built In
Steve Losh described the [Space Cadet Shift](http://stevelosh.com/blog/2012/10/a-modern-space-cadet/) quite well. Essentially, when you tap Left Shift on its own, you get an opening parenthesis; tap Right Shift on its own and you get the closing one. When held, the Shift keys function as normal. Yes, it's as cool as it sounds.
## Usage
Replace the Left Shift key in your keymap with `KC_LSPO` (Left Shift, Parenthesis Open), and Right Shift with `KC_RSPC` (Right Shift, Parenthesis Close).
## Keycodes
|Keycode |Description |
|---------|--------------------------------------|
|`KC_LSPO`|Left Shift when held, `(` when tapped |
|`KC_RSPC`|Right Shift when held, `)` when tapped|
## Caveats
Space Cadet's functionality can conflict with the default Command functionality when both Shift keys are held at the same time. Make sure that Command is disabled in your `rules.mk` with:
```make
COMMAND_ENABLE = no
```
## Configuration
By default Space Cadet assumes a US ANSI layout, but if your layout uses different keys for parentheses, you can redefine them in your `config.h`.
You can also disable the rollover, allowing you to use the opposite Shift key to cancel the Space Cadet state in the event of an erroneous press, instead of emitting a pair of parentheses when the keys are released.
Also, by default, the Space Cadet applies modifiers LSPO_MOD and RSPC_MOD to keys defined by LSPO_KEY and RSPC_KEY. You can override this behavior by redefining those variables in your `config.h`. You can also prevent the Space Cadet to apply a modifier by defining DISABLE_SPACE_CADET_MODIFIER in your `config.h`.
|Define |Default |Description |
|------------------------------|-------------|--------------------------------------------------------------------------------|
|`LSPO_KEY` |`KC_9` |The keycode to send when Left Shift is tapped |
|`RSPC_KEY` |`KC_0` |The keycode to send when Right Shift is tapped |
|`LSPO_MOD` |`KC_LSFT` |The keycode to send when Left Shift is tapped |
|`RSPC_MOD` |`KC_RSFT` |The keycode to send when Right Shift is tapped |
|`DISABLE_SPACE_CADET_ROLLOVER`|*Not defined*|If defined, use the opposite Shift key to cancel Space Cadet |
|`DISABLE_SPACE_CADET_MODIFIER`|*Not defined*|If defined, prevent the Space Cadet to apply a modifier to LSPO_KEY and RSPC_KEY|
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