keymap: Allow looking up by Component ID

Previously we only split key tries by editor Mode. This commit changes
that to allow other "domain"s like Component IDs. We'll use the
Component IDs later so that a Component like a Picker can look up
keybindings for itself.

The naming is a bit of a placeholder. The hashmap could just use
`&'static str` and we could add a From for Mode. But I'd like the key to
have some sort of formal name to it.

helix-term/src/config.rs

@@ -1,7 +1,6 @@
 use crate::keymap;
-use crate::keymap::{merge_keys, KeyTrie};
+use crate::keymap::{merge_keys, Domain, KeyTrie};
 use helix_loader::merge_toml_values;
-use helix_view::document::Mode;
 use serde::Deserialize;
 use std::collections::HashMap;
 use std::fmt::Display;
@@ -12,7 +11,7 @@ use toml::de::Error as TomlError;
 #[derive(Debug, Clone, PartialEq)]
 pub struct Config {
     pub theme: Option<String>,
-    pub keys: HashMap<Mode, KeyTrie>,
+    pub keys: HashMap<Domain, KeyTrie>,
     pub editor: helix_view::editor::Config,
 }
 
@@ -20,7 +19,7 @@ pub struct Config {
 #[serde(deny_unknown_fields)]
 pub struct ConfigRaw {
     pub theme: Option<String>,
-    pub keys: Option<HashMap<Mode, KeyTrie>>,
+    pub keys: Option<HashMap<Domain, KeyTrie>>,
     pub editor: Option<toml::Value>,
 }
 
@@ -154,11 +153,11 @@ mod tests {
         merge_keys(
             &mut keys,
             hashmap! {
-                Mode::Insert => keymap!({ "Insert mode"
+                Domain::Mode(Mode::Insert) => keymap!({ "Insert mode"
                     "y" => move_line_down,
                     "S-C-a" => delete_selection,
                 }),
-                Mode::Normal => keymap!({ "Normal mode"
+                Domain::Mode(Mode::Normal) => keymap!({ "Normal mode"
                     "A-F12" => move_next_word_end,
                 }),
             },

helix-term/src/keymap.rs

@@ -272,8 +272,15 @@ pub enum KeymapResult {
 /// A map of command names to keybinds that will execute the command.
 pub type ReverseKeymap = HashMap<String, Vec<Vec<KeyEvent>>>;
 
+// TODO name
+#[derive(Eq, Hash, PartialEq, Clone, Debug)]
+pub enum Domain {
+    Mode(Mode),
+    Component(&'static str),
+}
+
 pub struct Keymaps {
-    pub map: Box<dyn DynAccess<HashMap<Mode, KeyTrie>>>,
+    pub map: Box<dyn DynAccess<HashMap<Domain, KeyTrie>>>,
     /// Stores pending keys waiting for the next key. This is relative to a
     /// sticky node if one is in use.
     state: Vec<KeyEvent>,
@@ -282,7 +289,7 @@ pub struct Keymaps {
 }
 
 impl Keymaps {
-    pub fn new(map: Box<dyn DynAccess<HashMap<Mode, KeyTrie>>>) -> Self {
+    pub fn new(map: Box<dyn DynAccess<HashMap<Domain, KeyTrie>>>) -> Self {
         Self {
             map,
             state: Vec::new(),
@@ -290,7 +297,7 @@ impl Keymaps {
         }
     }
 
-    pub fn map(&self) -> DynGuard<HashMap<Mode, KeyTrie>> {
+    pub fn map(&self) -> DynGuard<HashMap<Domain, KeyTrie>> {
         self.map.load()
     }
 
@@ -303,14 +310,24 @@ impl Keymaps {
         self.sticky.as_ref()
     }
 
+    pub fn get_by_mode(&mut self, mode: Mode, key: KeyEvent) -> KeymapResult {
+        self.get(Domain::Mode(mode), key)
+    }
+
+    pub fn get_by_component_id(&mut self, id: &'static str, key: KeyEvent) -> KeymapResult {
+        self.get(Domain::Component(id), key)
+    }
+
     /// Lookup `key` in the keymap to try and find a command to execute. Escape
     /// key cancels pending keystrokes. If there are no pending keystrokes but a
     /// sticky node is in use, it will be cleared.
-    pub fn get(&mut self, mode: Mode, key: KeyEvent) -> KeymapResult {
-        // TODO: remove the sticky part and look up manually
+    fn get(&mut self, domain: Domain, key: KeyEvent) -> KeymapResult {
         let keymaps = &*self.map();
-        let keymap = &keymaps[&mode];
+        let Some(keymap) = keymaps.get(&domain) else {
+            return KeymapResult::NotFound;
+        };
 
+        // TODO: remove the sticky part and look up manually
         if key!(Esc) == key {
             if !self.state.is_empty() {
                 // Note that Esc is not included here
@@ -365,7 +382,7 @@ impl Default for Keymaps {
 }
 
 /// Merge default config keys with user overwritten keys for custom user config.
-pub fn merge_keys(dst: &mut HashMap<Mode, KeyTrie>, mut delta: HashMap<Mode, KeyTrie>) {
+pub fn merge_keys(dst: &mut HashMap<Domain, KeyTrie>, mut delta: HashMap<Domain, KeyTrie>) {
     for (mode, keys) in dst {
         keys.merge_nodes(
             delta
@@ -400,7 +417,7 @@ mod tests {
     #[test]
     fn merge_partial_keys() {
         let keymap = hashmap! {
-            Mode::Normal => keymap!({ "Normal mode"
+            Domain::Mode(Mode::Normal) => keymap!({ "Normal mode"
                     "i" => normal_mode,
                     "无" => insert_mode,
                     "z" => jump_backward,
@@ -416,23 +433,23 @@ mod tests {
 
         let mut keymap = Keymaps::new(Box::new(Constant(merged_keyamp.clone())));
         assert_eq!(
-            keymap.get(Mode::Normal, key!('i')),
+            keymap.get_by_mode(Mode::Normal, key!('i')),
             KeymapResult::Matched(MappableCommand::normal_mode),
             "Leaf should replace leaf"
         );
         assert_eq!(
-            keymap.get(Mode::Normal, key!('无')),
+            keymap.get_by_mode(Mode::Normal, key!('无')),
             KeymapResult::Matched(MappableCommand::insert_mode),
             "New leaf should be present in merged keymap"
         );
         // Assumes that z is a node in the default keymap
         assert_eq!(
-            keymap.get(Mode::Normal, key!('z')),
+            keymap.get_by_mode(Mode::Normal, key!('z')),
             KeymapResult::Matched(MappableCommand::jump_backward),
             "Leaf should replace node"
         );
 
-        let keymap = merged_keyamp.get_mut(&Mode::Normal).unwrap();
+        let keymap = merged_keyamp.get_mut(&Domain::Mode(Mode::Normal)).unwrap();
         // Assumes that `g` is a node in default keymap
         assert_eq!(
             keymap.search(&[key!('g'), key!('$')]).unwrap(),
@@ -454,7 +471,7 @@ mod tests {
 
         assert!(
             merged_keyamp
-                .get(&Mode::Normal)
+                .get(&Domain::Mode(Mode::Normal))
                 .and_then(|key_trie| key_trie.node())
                 .unwrap()
                 .len()
@@ -462,7 +479,7 @@ mod tests {
         );
         assert!(
             merged_keyamp
-                .get(&Mode::Insert)
+                .get(&Domain::Mode(Mode::Insert))
                 .and_then(|key_trie| key_trie.node())
                 .unwrap()
                 .len()
@@ -473,7 +490,7 @@ mod tests {
     #[test]
     fn order_should_be_set() {
         let keymap = hashmap! {
-            Mode::Normal => keymap!({ "Normal mode"
+            Domain::Mode(Mode::Normal) => keymap!({ "Normal mode"
                     "space" => { ""
                         "s" => { ""
                             "v" => vsplit,
@@ -485,7 +502,7 @@ mod tests {
         let mut merged_keyamp = default();
         merge_keys(&mut merged_keyamp, keymap.clone());
         assert_ne!(keymap, merged_keyamp);
-        let keymap = merged_keyamp.get_mut(&Mode::Normal).unwrap();
+        let keymap = merged_keyamp.get_mut(&Domain::Mode(Mode::Normal)).unwrap();
         // Make sure mapping works
         assert_eq!(
             keymap.search(&[key!(' '), key!('s'), key!('v')]).unwrap(),
@@ -500,7 +517,7 @@ mod tests {
     #[test]
     fn aliased_modes_are_same_in_default_keymap() {
         let keymaps = Keymaps::default().map();
-        let root = keymaps.get(&Mode::Normal).unwrap();
+        let root = keymaps.get(&Domain::Mode(Mode::Normal)).unwrap();
         assert_eq!(
             root.search(&[key!(' '), key!('w')]).unwrap(),
             root.search(&["C-w".parse::<KeyEvent>().unwrap()]).unwrap(),

helix-term/src/keymap/default.rs

@@ -1,10 +1,10 @@
 use std::collections::HashMap;
 
 use super::macros::keymap;
-use super::{KeyTrie, Mode};
+use super::{Domain, KeyTrie, Mode};
 use helix_core::hashmap;
 
-pub fn default() -> HashMap<Mode, KeyTrie> {
+pub fn default() -> HashMap<Domain, KeyTrie> {
     let normal = keymap!({ "Normal mode"
         "h" | "left" => move_char_left,
         "j" | "down" => move_visual_line_down,
@@ -380,8 +380,8 @@ pub fn default() -> HashMap<Mode, KeyTrie> {
         "end" => goto_line_end_newline,
     });
     hashmap!(
-        Mode::Normal => normal,
-        Mode::Select => select,
-        Mode::Insert => insert,
+        Domain::Mode(Mode::Normal) => normal,
+        Domain::Mode(Mode::Select) => select,
+        Domain::Mode(Mode::Insert) => insert,
     )
 }

helix-term/src/ui/editor.rs

@@ -792,7 +792,7 @@ impl EditorView {
     ) -> Option<KeymapResult> {
         let mut last_mode = mode;
         self.pseudo_pending.extend(cxt.keymaps.pending());
-        let key_result = cxt.keymaps.get(mode, event);
+        let key_result = cxt.keymaps.get_by_mode(mode, event);
         cxt.editor.autoinfo = cxt.keymaps.sticky().map(|node| node.infobox());
 
         let mut execute_command = |command: &commands::MappableCommand| {