Support WLR_INPUT_DEVICE_SWITCH in sway

This commit adds support for laptop lid and tablet
mode switches as provided by evdev/libinput and
handled by wlroots.

Adds a new bindswitch command with syntax:
bindswitch <switch>:<state> <command>

Where <switch> is one of:
tablet for WLR_SWITCH_TYPE_TABLET_MODE
lid for WLR_SWITCH_TYPE_LID

<state> is one of:
on for WLR_SWITCH_STATE_ON
off for WLR_SWITCH_STATE_OFF
toggle for WLR_SWITCH_STATE_TOGGLE

(Note that WLR_SWITCH_STATE_TOGGLE doesn't map to
libinput and will trigger at both on and off events)

1 files changed, 25 insertions, 3 deletions

diff --git a/sway/sway.5.scd b/sway/sway.5.scd
index 989717cb..18fc28a3 100644
--- a/sway/sway.5.scd
+++ b/sway/sway.5.scd
@@ -341,6 +341,28 @@ runtime.
         *bindcode* [--whole-window] [--border] [--exclude-titlebar] [--release] [--locked] [--input-device=<device>] [--no-warn] <code> <command>
         is also available for binding with key/button codes instead of key/button names.
 
+*bindswitch* [--locked] [--no-warn] <switch>:<state> <command>
+        Binds <switch> to execute the sway command _command_ on state changes.
+        Supported switches are _lid_ (laptop lid) and _tablet_ (tablet mode)
+        switches. Valid values for _state_ are _on_, _off_ and _toggle. These
+        switches are on when the device lid is shut and when tablet mode is active
+        respectively. _toggle_ is also supported to run a command both when the
+        switch is toggled on or off.
+
+        Unless the flag _--locked_ is set, the command will not be run
+        when a screen locking program is active. By default, if you
+        overwrite a binding, swaynag will give you a warning. To silence this, use
+        the _--no-warn_ flag.
+
+        Example:
+```
+                # Show the virtual keyboard when tablet mode is entered.
+                bindswitch tablet:on busctl call --user sm.puri.OSK0 /sm/puri/OSK0 sm.puri.OSK0 SetVisible b true
+
+                # Log a message when the laptop lid is opened or closed.
+                bindswitch lid:toggle exec echo "Lid moved"
+```
+
 *client.<class>* <border> <background> <text> <indicator> <child_border>
         Configures the color of window borders and title bars. All 5 colors are
         required, with the exception of *client.background*, which requires exactly
@@ -551,9 +573,9 @@ The default colors are:
         Switches to the specified mode. The default mode _default_.
 
 *mode* [--pango_markup] <mode> <mode-subcommands...>
-        The only two valid _mode-subcommands..._ are *bindsym* and *bindcode*.
-        If _--pango_markup_ is given, then _mode_ will be interpreted as pango
-        markup.
+        The only valid _mode-subcommands..._ are *bindsym*, *bindcode* and
+        *bindswitch*. If _--pango_markup_ is given, then _mode_ will be interpreted
+        as pango markup.
 
 *mouse_warping* output|container|none
         If _output_ is specified, the mouse will be moved to new outputs as you