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# Akela-TopsyTurvy
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![status][st:experimental]
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[st:stable]: https://img.shields.io/badge/stable-✔-black.png?style=flat&colorA=44cc11&colorB=494e52
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[st:broken]: https://img.shields.io/badge/broken-X-black.png?style=flat&colorA=e05d44&colorB=494e52
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[st:experimental]: https://img.shields.io/badge/experimental----black.png?style=flat&colorA=dfb317&colorB=494e52
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`TopsyTurvy` is a plugin that inverts the behaviour of the `Shift` key for some
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selected keys. That is, if configured so, it will input `!` when pressing the
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`1` key without `Shift`, but with the modifier pressed, it will input the
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original `1` symbol.
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## Using the plugin
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To use the plugin, one needs to include the header, create a list, and configure
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the provided `TopsyTurvy` object to use the dictionary:
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```c++
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#include <Akela-TopsyTurvy.h>
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static const Key topsyTurvyList[] PROGMEM = {
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Key_1, Key_2, Key_3, Key_4, Key_5,
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Key_6, Key_7, Key_8, Key_9, Key_0,
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Key_NoKey
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};
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void setup () {
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TopsyTurvy.configure (topsyTurvyList);
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Keyboardio.setup (KEYMAP_SIZE);
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Keyboardio.use (&TopsyTurvy, NULL);
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}
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```
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The list of keys **must** be terminated with a `Key_NoKey`, and **must** reside
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in `PROGMEM`.
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## Plugin methods
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The plugin provides the `TopsyTurvy` object, with the following methods:
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### `.configure(list)`
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> Tells `TopsyTurvy` to use the specified list of keys.
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### `.on()`
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> Turns the shift-inversion functionality on.
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### `.off()`
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> Turns the shift-inversion functionality off. In this case, no transformations
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> will be applied, and even if keys pressed appear in the list, they will be
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> ignored until the plugin is turned back on.
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## Further reading
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Starting from the [example][plugin:example] is the recommended way of getting
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started with the plugin.
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[plugin:example]: https://github.com/Akela-Plugins/Akela-TopsyTurvy/blob/master/examples/TopsyTurvy/TopsyTurvy.ino
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