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94 lines
3.4 KiB
94 lines
3.4 KiB
# Akela-Syster
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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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Syster is a way to input symbols in a different way: instead of macros, Leader
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sequences or the like, we trigger the special input mode, and enter the symbol's
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name. Once finished, we hit `Space`, and this plugin will do the rest: delete
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everything we typed, look up an action for the entered symbol, and execute that.
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There are a number of ways this can be useful, but the easiest showcase is
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symbolic Unicode input: `SYSTER coffee SPACE` turns into `☕`, witch just a
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little code.
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## Using the plugin
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To use the plugin, one needs to include the header, and set up a function that
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will handle the symbol actions:
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```c++
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#include <Akela-Syster.h>
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#include <Akela-Unicode.h>
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void systerAction (Akela::Syster::action_t action, const char *symbol) {
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switch (action) {
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case Akela::Syster::StartAction:
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Unicode.type (0x2328);
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break;
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case Akela::Syster::EndAction:
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handle_key_event (Key_Backspace, 255, 255, IS_PRESSED | INJECTED);
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Keyboard.sendReport ();
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handle_key_event (Key_Backspace, 255, 255, WAS_PRESSED | INJECTED);
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Keyboard.sendReport ();
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break;
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case Akela::Syster::SymbolAction:
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Serial.print ("systerAction: symbol=");
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Serial.println (symbol);
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if (strcmp (symbol, "coffee") == 0) {
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Unicode.type (0x2615);
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}
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break;
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}
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}
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void setup () {
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Serial.begin (9600);
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Keyboardio.setup (KEYMAP_SIZE);
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Keyboardio.use (&Unicode, &Syster, NULL);
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}
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```
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**Note** that we need to use the `Syster` object before any other that adds or
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changes key behaviour! Failing to do so may result in unpredictable behaviour.
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## Plugin methods
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The plugin provides the `Syster` object, with no public methods. There are two
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methods outside of the object, however, that can be overridden:
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### `systerAction(action, symbol)`
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> Called whenever an action needs to be taken, which can happen in three cases:
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> First, when the `Syster` key is pressed, and the alternate processing starts.
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> In this case, `action` will be set to `Akela::Syster::StartAction`, and
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> `symbol` will be `NULL`. This function can be used to do some setup to make it
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> more obvious that the Syster input mode is active, such as sending a Unicode
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> symbol to the host, or lighting up LEDs, or anything else we'd like.
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>
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> Second, when the sequence is finished with a `Space`. In this case, `action`
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> will be set to `Akela::Syster::EndAction`, and `symbol` will be `NULL`. This
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> can be used to undo anything that the start action did, if need be.
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>
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> Third, when the action for the symbol should be made. In this case, `action`
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> is set to `Akela::Syster::SymbolAction`, and `symbol` will be a C string. It
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> is up to us, what we do with this information, how we handle it.
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### `keyToChar(key)`
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> A function that turns a keycode into a character. If using QWERTY on the host,
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> the default implementation is sufficient. When using something else, you may
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> have to reimplement this function.
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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/keyboardio/Akela-Syster/blob/master/examples/Syster/Syster.ino
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