Hints backend (#234)

* Generate hints from list of actions

* Remove redundant Key from output

* Improve formatting

* Change logging verbosity for hints

core/editor/src/communication/dispatcher.rs

@@ -33,6 +33,7 @@ impl Dispatcher {
 		) || MessageDiscriminant::from(&message).local_name().ends_with("MouseMove"))
 		{
 			log::trace!("Message: {}", message.to_discriminant().local_name());
+			log::trace!("Hints:{}", self.input_mapper.hints(self.collect_actions()));
 		}
 		match message {
 			NoOp => (),

core/editor/src/input/input_mapper.rs

@@ -1,11 +1,12 @@
-use crate::consts::{MINUS_KEY_ZOOM_RATE, PLUS_KEY_ZOOM_RATE};
-use crate::message_prelude::*;
-use crate::tool::ToolType;
-
 use super::{
 	keyboard::{Key, KeyStates, NUMBER_OF_KEYS},
 	InputPreprocessor,
 };
+use crate::consts::{MINUS_KEY_ZOOM_RATE, PLUS_KEY_ZOOM_RATE};
+use crate::message_prelude::*;
+use crate::tool::ToolType;
+
+use std::fmt::Write;
 
 const NUDGE_AMOUNT: f64 = 1.;
 const SHIFT_NUDGE_AMOUNT: f64 = 10.;
@@ -16,6 +17,7 @@ pub enum InputMapperMessage {
 	PointerMove,
 	MouseScroll,
 	KeyUp(Key),
+	#[child]
 	KeyDown(Key),
 }
 
@@ -281,6 +283,32 @@ pub struct InputMapper {
 	mapping: Mapping,
 }
 
+impl InputMapper {
+	pub fn hints(&self, actions: ActionList) -> String {
+		let mut output = String::new();
+		let actions: Vec<MessageDiscriminant> = actions
+			.into_iter()
+			.flatten()
+			.filter(|a| !matches!(*a, MessageDiscriminant::Tool(ToolMessageDiscriminant::SelectTool) | MessageDiscriminant::Global(_)))
+			.collect();
+		self.mapping
+			.key_down
+			.iter()
+			.enumerate()
+			.filter_map(|(i, m)| {
+				let ma =
+					m.0.iter()
+						.find_map(|m| actions.iter().find_map(|a| (a == &m.action.to_discriminant()).then(|| m.action.to_discriminant())));
+
+				ma.map(|a| unsafe { (std::mem::transmute_copy::<usize, Key>(&i), a) })
+			})
+			.for_each(|(k, a)| {
+				let _ = write!(output, "{}: {}, ", k.to_discriminant().local_name(), a.local_name().split('.').last().unwrap());
+			});
+		output.replace("Key", "")
+	}
+}
+
 impl MessageHandler<InputMapperMessage, (&InputPreprocessor, ActionList)> for InputMapper {
 	fn process_action(&mut self, message: InputMapperMessage, data: (&InputPreprocessor, ActionList), responses: &mut VecDeque<Message>) {
 		let (input, actions) = data;

core/editor/src/input/keyboard.rs

@@ -1,3 +1,5 @@
+use crate::message_prelude::*;
+
 pub const NUMBER_OF_KEYS: usize = Key::NumKeys as usize;
 // Edit this to specify the storage type used
 // TODO: Increase size of type
@@ -9,6 +11,7 @@ const STORAGE_SIZE_BITS: usize = 1 << STORAGE_SIZE;
 const KEY_MASK_STORAGE_LENGTH: usize = (NUMBER_OF_KEYS + STORAGE_SIZE_BITS - 1) >> STORAGE_SIZE;
 pub type KeyStates = BitVector<KEY_MASK_STORAGE_LENGTH>;
 
+#[impl_message(Message, InputMapperMessage, KeyDown)]
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum Key {
 	UnknownKey,