docs: generate API docs (#4)

Co-authored-by: haithium <128622475+haithium@users.noreply.github.com>

Author: github-actions[bot]

docs/api/device.md

@@ -0,0 +1,338 @@
+---
+description: "One Linux input event returned by `Device:read()`."
+---
+
+# `device`
+
+One Linux input event returned by `Device:read()`.
+
+## Functions
+
+| Function                                      | Description                                                           |
+| --------------------------------------------- | --------------------------------------------------------------------- |
+| [`close()`](#fn-close)                        | Close the device.                                                     |
+| [`events()`](#fn-events)                      | Return an iterator that waits for and yields input events one by one. |
+| [`fd()`](#fn-fd)                              | Return the underlying Linux file descriptor.                          |
+| [`flush()`](#fn-flush)                        | Drain queued events and return how many were discarded.               |
+| [`get_repeat()`](#fn-get-repeat)              | Return the current auto-repeat delay and period in milliseconds.      |
+| [`grab()`](#fn-grab)                          | Take exclusive control of the input device.                           |
+| [`is_device(value)`](#fn-is-device)           | Return whether a value is an `evdev.Device` instance.                 |
+| [`is_open()`](#fn-is-open)                    | Return whether this device handle still has an open file descriptor.  |
+| [`open(path)`](#fn-open)                      | Open an input device by path.                                         |
+| [`poll()`](#fn-poll)                          | Wait in the kernel until this device has input available.             |
+| [`read()`](#fn-read)                          | Read one input event. Returns `nil` when no event is queued.          |
+| [`set_repeat(delay, period)`](#fn-set-repeat) | Set the auto-repeat delay and period in milliseconds.                 |
+| [`ungrab()`](#fn-ungrab)                      | Release exclusive control of the input device.                        |
+
+<a id="fn-close"></a>
+
+### `close()`
+
+Close the device.
+
+**Return**:
+
+- `ok` (`boolean`): `true` when the device closes successfully.
+- `err` (`string?`): Error message on failure.
+
+**Example**:
+
+```lua
+local Device = evdev.device.open
+local dev = assert(Device("/dev/input/eventX"))
+
+print(dev:is_open()) --> true
+dev:close()
+print(dev:is_open()) --> false
+```
+
+<a id="fn-events"></a>
+
+### `events()`
+
+Return an iterator that waits for and yields input events one by one.
+
+**Return**:
+
+- `evdev.event?` (`fun():`)
+
+**Example**:
+
+```lua
+local Device = evdev.device.open
+local dev = assert(Device("/dev/input/eventX"))
+
+for e in dev:events() do
+  if e.type == ecodes.EV_KEY then
+    print(e.code, e.value)
+  end
+end
+```
+
+<a id="fn-fd"></a>
+
+### `fd()`
+
+Return the underlying Linux file descriptor.
+
+**Return**:
+
+- `fd` (`evdev.fd?`): Linux file descriptor.
+
+**Example**:
+
+```lua
+local Device = evdev.device.open
+local dev = assert(Device("/dev/input/eventX"))
+
+local fd = dev:fd()
+print(fd)
+```
+
+<a id="fn-flush"></a>
+
+### `flush()`
+
+Drain queued events and return how many were discarded.
+
+This is useful after grabbing a device when you want to ignore any stale events
+that were already queued.
+
+**Return**:
+
+- `count` (`integer?`): Number of discarded events.
+- `err` (`string?`): Error message on failure.
+
+**Example**:
+
+```lua
+local Device = evdev.device.open
+local dev = assert(Device("/dev/input/eventX"))
+
+assert(dev:grab())
+-- Move the mouse or press keys during the sleep.
+
+local dropped = assert(dev:flush())
+print("discarded", dropped, "stale events")
+```
+
+<a id="fn-get-repeat"></a>
+
+### `get_repeat()`
+
+Return the current auto-repeat delay and period in milliseconds.
+
+**Return**:
+
+- `delay` (`integer?`): Initial delay before repeating (milliseconds).
+- `period` (`integer?`): Interval between repeats (milliseconds).
+- `err` (`string?`): Error message on failure.
+
+**Example**:
+
+```lua
+local Device = evdev.device.open
+local dev = assert(Device("/dev/input/eventX"))
+
+local delay, period, err = dev:get_repeat()
+assert(delay, err)
+print(delay, period)
+```
+
+<a id="fn-grab"></a>
+
+### `grab()`
+
+Take exclusive control of the input device.
+
+**Return**:
+
+- `ok` (`true?`): `true` when the device is grabbed successfully.
+- `err` (`string?`): Error message on failure.
+
+**Example**:
+
+```lua
+local Device = evdev.device.open
+local dev = assert(Device("/dev/input/eventX"))
+assert(dev:grab())
+```
+
+<a id="fn-is-device"></a>
+
+### `is_device(value)`
+
+Return whether a value is an `evdev.Device` instance.
+
+**Parameters**:
+
+- `value` (`any`)
+
+**Return**:
+
+- **value** (`boolean`)
+
+**Example**:
+
+```lua
+local Device = evdev.device.open
+local is_device = evdev.device.is_device
+
+local dev = assert(Device("/dev/input/eventX"))
+print(is_device(dev)) --> true
+print(is_device({}))  --> false
+```
+
+<a id="fn-is-open"></a>
+
+### `is_open()`
+
+Return whether this device handle still has an open file descriptor.
+
+**Return**:
+
+- `isOpen` (`boolean`): `true` when the device is still open.
+
+**Example**:
+
+```lua
+local Device = evdev.device.open
+local dev = assert(Device("/dev/input/eventX"))
+
+if dev:is_open()
+  then dev:close()
+end
+```
+
+<a id="fn-open"></a>
+
+### `open(path)`
+
+Open an input device by path.
+
+**Parameters**:
+
+- `path` (`evdev.path`)
+
+**Return**:
+
+- `dev` (`evdev.Device?`): Open input device.
+- `err` (`string?`): Error message on failure.
+
+**Example**:
+
+```lua
+local Device = evdev.device.open
+local dev = assert(Device("/dev/input/eventX"))
+```
+
+<a id="fn-poll"></a>
+
+### `poll()`
+
+Wait in the kernel until this device has input available.
+
+This does not spin the CPU. It returns when `read()` can fetch at least one
+queued event.
+
+**Return**:
+
+- `ready` (`boolean?`): `true` when input is ready to read.
+- `err` (`string?`): Error message on failure.
+
+**Example**:
+
+```lua
+local Device = evdev.device.open
+local ecodes = evdev.ecodes
+
+local dev = assert(Device("/dev/input/eventX"))
+
+-- This is the manual form of `dev:events()`.
+while true do
+  if assert(dev:poll()) then
+    local e = assert(dev:read())
+    if e.type == ecodes.EV_KEY then
+      print(e.code, e.value)
+    end
+  end
+end
+```
+
+<a id="fn-read"></a>
+
+### `read()`
+
+Read one input event. Returns `nil` when no event is queued.
+
+**Return**:
+
+- `event` (`evdev.event?`): Next queued input event.
+- `err` (`string?`): Error message on failure.
+
+**Example**:
+
+```lua
+local Device = evdev.device.open
+local dev = assert(Device("/dev/input/eventX"))
+
+-- This is the manual form of `dev:events()`.
+while true do
+  if assert(dev:poll()) then
+    local e = assert(dev:read())
+    if e.type == ecodes.EV_KEY then
+      print(e.code, e.value)
+    end
+  end
+end
+```
+
+<a id="fn-set-repeat"></a>
+
+### `set_repeat(delay, period)`
+
+Set the auto-repeat delay and period in milliseconds.
+
+**Parameters**:
+
+- `delay` (`integer`): Initial delay before repeating (milliseconds).
+- `period` (`integer`): Interval between repeats (milliseconds).
+
+**Return**:
+
+- `ok` (`true?`): `true` when the repeat settings are updated successfully.
+- `err` (`string?`): Error message on failure.
+
+**Example**:
+
+```lua
+local Device = evdev.device.open
+local dev = assert(Device("/dev/input/eventX"))
+
+local delay, period, err = dev:get_repeat()
+assert(delay, err)
+print(delay, period)
+
+assert(dev:set_repeat(300, 40))
+print(dev:get_repeat())
+```
+
+<a id="fn-ungrab"></a>
+
+### `ungrab()`
+
+Release exclusive control of the input device.
+
+**Return**:
+
+- `ok` (`true?`): `true` when the grab is released successfully.
+- `err` (`string?`): Error message on failure.
+
+**Example**:
+
+```lua
+local Device = evdev.device.open
+local dev = assert(Device("/dev/input/eventX"))
+assert(dev:grab())
+assert(dev:ungrab())
+```