Kaleidoscope/doc/plugin/HostOS.md

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# Kaleidoscope-HostOS
The `HostOS` extension is not all that useful in itself, rather, it is a
building block other plugins and extensions can use to not repeat the same
guesswork and logic.
The goal is to have a single place that remembers the host OS, whether set by
the end-user in a Sketch, or via a macro, or some other way. This information
can then be reused by other plugins.
See the [Unicode][plugin:unicode] extension for an example about how to use
`HostOS` in practice.
[plugin:unicode]: Unicode.md
## Using the extension
The extension provides a `HostOS` singleton object.
```c++
#include <Kaleidoscope.h>
#include <Kaleidoscope-HostOS.h>
void someFunction(void) {
if (HostOS.os() == kaleidoscope::hostos::LINUX) {
// do something linux-y
}
if (HostOS.os() == kaleidoscope::hostos::OSX) {
// do something OSX-y
}
}
KALEIDOSCOPE_INIT_PLUGINS(HostOS)
void setup(void) {
Kaleidoscope.setup ();
}
```
## Extension methods
The extension provides the following methods on the `HostOS` singleton:
### `.os()`
> Returns the stored type of the Host OS.
### `.os(type)`
> Sets the type of the host OS, overriding any previous value. The type is then
> stored in EEPROM for persistence.
## Host OS Values
The OS type (i.e. the return type of `.os()` and the arguments to `.os(type)`) will be one of the following:
- `kaleidoscope::hostos::LINUX`
- `kaleidoscope::hostos::OSX`
- `kaleidoscope::hostos::WINDOWS`
- `kaleidoscope::hostos::OTHER`
## Focus commands
The plugin provides the `FocusHostOSCommand` object, which, when enabled,
provides the `hostos.type` Focus command.
### `hostos.type [type]`
> Without argument, returns the current OS type set (a numeric value).
>
> With an argument, it sets the OS type.
>
> This command can be used from the host to reliably set the OS type within the firmware.
## Dependencies
* [Kaleidoscope-EEPROM-Settings](EEPROM-Settings.md)
## Further reading
Starting from the [example][plugin:example] is the recommended way of getting
started with the extension.
[plugin:example]: ../../examples/Features/HostOS/HostOS.ino