Expose IDs to be used for parsing component names

This is just the picker for now but could be expanded to other
components.

helix-term/src/commands.rs

@@ -2591,7 +2591,8 @@ fn buffer_picker(cx: &mut Context) {
             .primary()
             .cursor_line(doc.text().slice(..));
         Some((meta.id.into(), Some((line, line))))
-    });
+    })
+    .with_id("buffer-picker");
     cx.push_layer(Box::new(overlaid(picker)));
 }
 

helix-term/src/keymap.rs

@@ -279,6 +279,34 @@ pub enum Domain {
     Component(&'static str),
 }
 
+const REMAPPABLE_COMPONENTS: [&'static str; 3] = [
+    crate::ui::DYNAMIC_PICKER_ID,
+    crate::ui::PICKER_ID,
+    // TODO: make it a constant
+    "buffer-picker",
+];
+
+impl<'de> Deserialize<'de> for Domain {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        let s = String::deserialize(deserializer)?;
+        if let Ok(mode) = s.parse::<Mode>() {
+            return Ok(Domain::Mode(mode));
+        } else if let Some(name) = REMAPPABLE_COMPONENTS
+            .iter()
+            .find(|name| **name == s.as_str())
+        {
+            Ok(Domain::Component(name))
+        } else {
+            Err(serde::de::Error::custom(format!(
+                "Unknown keymap domain {s}. Expected a mode or component name"
+            )))
+        }
+    }
+}
+
 pub struct Keymaps {
     pub map: Box<dyn DynAccess<HashMap<Domain, KeyTrie>>>,
     /// Stores pending keys waiting for the next key. This is relative to a

helix-term/src/ui/mod.rs

@@ -7,7 +7,7 @@ pub mod lsp;
 mod markdown;
 pub mod menu;
 pub mod overlay;
-mod picker;
+pub mod picker;
 pub mod popup;
 mod prompt;
 mod spinner;
@@ -21,7 +21,7 @@ pub use completion::{Completion, CompletionItem};
 pub use editor::EditorView;
 pub use markdown::Markdown;
 pub use menu::Menu;
-pub use picker::{DynamicPicker, FileLocation, Picker};
+pub use picker::{DynamicPicker, FileLocation, Picker, DYNAMIC_PICKER_ID, PICKER_ID};
 pub use popup::Popup;
 pub use prompt::{Prompt, PromptEvent};
 pub use spinner::{ProgressSpinners, Spinner};

helix-term/src/ui/picker.rs

@@ -114,6 +114,8 @@ impl Preview<'_, '_> {
     }
 }
 
+pub const PICKER_ID: &'static str = "picker";
+
 pub struct Picker<T: Item> {
     options: Vec<T>,
     editor_data: T::Data,
@@ -141,6 +143,9 @@ pub struct Picker<T: Item> {
     read_buffer: Vec<u8>,
     /// Given an item in the picker, return the file path and line number to display.
     file_fn: Option<FileCallback<T>>,
+
+    /// A unique identifier for the picker as a Component
+    id: &'static str,
 }
 
 impl<T: Item + 'static> Picker<T> {
@@ -172,6 +177,7 @@ impl<T: Item + 'static> Picker<T> {
             preview_cache: HashMap::new(),
             read_buffer: Vec::with_capacity(1024),
             file_fn: None,
+            id: PICKER_ID,
         };
 
         picker.calculate_column_widths();
@@ -205,6 +211,11 @@ impl<T: Item + 'static> Picker<T> {
         self
     }
 
+    pub fn with_id(mut self, id: &'static str) -> Self {
+        self.id = id;
+        self
+    }
+
     pub fn set_options(&mut self, new_options: Vec<T>) {
         self.options = new_options;
         self.cursor = 0;
@@ -871,6 +882,10 @@ impl<T: Item + 'static> Component for Picker<T> {
         self.completion_height = height.saturating_sub(4);
         Some((width, height))
     }
+
+    fn id(&self) -> Option<&'static str> {
+        Some(self.id)
+    }
 }
 
 #[derive(PartialEq, Eq, Debug)]
@@ -905,6 +920,8 @@ type PickerCallback<T> = Box<dyn Fn(&mut Context, &T, Action)>;
 pub type DynQueryCallback<T> =
     Box<dyn Fn(String, &mut Editor) -> BoxFuture<'static, anyhow::Result<Vec<T>>>>;
 
+pub const DYNAMIC_PICKER_ID: &'static str = "dynamic-picker";
+
 /// A picker that updates its contents via a callback whenever the
 /// query string changes. Useful for live grep, workspace symbols, etc.
 pub struct DynamicPicker<T: ui::menu::Item + Send> {
@@ -914,8 +931,6 @@ pub struct DynamicPicker<T: ui::menu::Item + Send> {
 }
 
 impl<T: ui::menu::Item + Send> DynamicPicker<T> {
-    pub const ID: &'static str = "dynamic-picker";
-
     pub fn new(file_picker: Picker<T>, query_callback: DynQueryCallback<T>) -> Self {
         Self {
             file_picker,
@@ -947,7 +962,8 @@ impl<T: Item + Send + 'static> Component for DynamicPicker<T> {
             let callback = Callback::EditorCompositor(Box::new(move |editor, compositor| {
                 // Wrapping of pickers in overlay is done outside the picker code,
                 // so this is fragile and will break if wrapped in some other widget.
-                let picker = match compositor.find_id::<Overlay<DynamicPicker<T>>>(Self::ID) {
+                let picker =
+                    match compositor.find_id::<Overlay<DynamicPicker<T>>>(DYNAMIC_PICKER_ID) {
                         Some(overlay) => &mut overlay.content.file_picker,
                         None => return,
                     };
@@ -968,6 +984,6 @@ impl<T: Item + Send + 'static> Component for DynamicPicker<T> {
     }
 
     fn id(&self) -> Option<&'static str> {
-        Some(Self::ID)
+        Some(DYNAMIC_PICKER_ID)
     }
 }