Implement key ordering for info box

helix-term/src/keymap.rs

@@ -5,7 +5,7 @@ use helix_view::{document::Mode, info::Info, input::KeyEvent};
 use serde::Deserialize;
 use std::{
     borrow::Cow,
-    collections::HashMap,
+    collections::{BTreeSet, HashMap},
     ops::{Deref, DerefMut},
 };
 
@@ -137,20 +137,28 @@ impl KeyTrieNode {
     }
 
     pub fn infobox(&self) -> Info {
-        let mut body: Vec<(&str, Vec<KeyEvent>)> = Vec::with_capacity(self.len());
+        let mut body: Vec<(&str, BTreeSet<KeyEvent>)> = Vec::with_capacity(self.len());
         for (&key, trie) in self.iter() {
             let desc = match trie {
                 KeyTrie::Leaf(cmd) => cmd.doc(),
                 KeyTrie::Node(n) => n.name(),
             };
             match body.iter().position(|(d, _)| d == &desc) {
-                // FIXME: multiple keys are ordered randomly (use BTreeSet)
-                Some(pos) => body[pos].1.push(key),
-                None => body.push((desc, vec![key])),
+                Some(pos) => {
+                    body[pos].1.insert(key);
+                }
+                None => {
+                    let mut keys = BTreeSet::new();
+                    keys.insert(key);
+                    body.push((desc, keys));
+                }
             }
         }
         body.sort_unstable_by_key(|(_, keys)| {
-            self.order.iter().position(|&k| k == keys[0]).unwrap()
+            self.order
+                .iter()
+                .position(|&k| k == *keys.iter().next().unwrap())
+                .unwrap()
         });
         let prefix = format!("{} ", self.name());
         if body.iter().all(|(desc, _)| desc.starts_with(&prefix)) {

helix-view/src/info.rs

@@ -1,6 +1,6 @@
 use crate::input::KeyEvent;
 use helix_core::unicode::width::UnicodeWidthStr;
-use std::fmt::Write;
+use std::{collections::BTreeSet, fmt::Write};
 
 #[derive(Debug)]
 /// Info box used in editor. Rendering logic will be in other crate.
@@ -16,7 +16,7 @@ pub struct Info {
 }
 
 impl Info {
-    pub fn new(title: &str, body: Vec<(&str, Vec<KeyEvent>)>) -> Info {
+    pub fn new(title: &str, body: Vec<(&str, BTreeSet<KeyEvent>)>) -> Info {
         let body = body
             .into_iter()
             .map(|(desc, events)| {

helix-view/src/input.rs

@@ -8,7 +8,7 @@ use crate::keyboard::{KeyCode, KeyModifiers};
 
 /// Represents a key event.
 // We use a newtype here because we want to customize Deserialize and Display.
-#[derive(Debug, PartialEq, Eq, PartialOrd, Clone, Copy, Hash)]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Hash)]
 pub struct KeyEvent {
     pub code: KeyCode,
     pub modifiers: KeyModifiers,

helix-view/src/keyboard.rs

@@ -54,7 +54,7 @@ impl From<crossterm::event::KeyModifiers> for KeyModifiers {
 }
 
 /// Represents a key.
-#[derive(Debug, PartialOrd, PartialEq, Eq, Clone, Copy, Hash)]
+#[derive(Debug, PartialOrd, Ord, PartialEq, Eq, Clone, Copy, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub enum KeyCode {
     /// Backspace key.