Help menu improvements (#4997)

* Help menu improvements

* default config

crates/nu-cli/src/help_completions.rs

@@ -1,5 +1,5 @@
 use nu_engine::documentation::get_flags_section;
-use nu_protocol::engine::EngineState;
+use nu_protocol::{engine::EngineState, levenshtein_distance};
 use reedline::{Completer, Suggestion};
 
 pub const EXAMPLE_MARKER: &str = ">>>>>>";
@@ -18,7 +18,7 @@ impl NuHelpCompleter {
         let full_commands = self.engine_state.get_signatures_with_examples(false);
 
         //Vec<(Signature, Vec<Example>, bool, bool)> {
-        full_commands
+        let mut commands = full_commands
             .iter()
             .filter(|(sig, _, _, _)| {
                 sig.name.to_lowercase().contains(&line.to_lowercase())
@@ -28,6 +28,16 @@ impl NuHelpCompleter {
                         .to_lowercase()
                         .contains(&line.to_lowercase())
             })
+            .collect::<Vec<_>>();
+
+        commands.sort_by(|(a, _, _, _), (b, _, _, _)| {
+            let a_distance = levenshtein_distance(line, &a.name);
+            let b_distance = levenshtein_distance(line, &b.name);
+            a_distance.cmp(&b_distance)
+        });
+
+        commands
+            .into_iter()
             .map(|(sig, examples, _, _)| {
                 let mut long_desc = String::new();
 

crates/nu-cli/src/help_menu.rs

@@ -93,7 +93,7 @@ impl Default for NuHelpMenu {
             values: Vec::new(),
             col_pos: 0,
             row_pos: 0,
-            marker: "| ".to_string(),
+            marker: "? ".to_string(),
             event: None,
             input: None,
             examples: Vec::new(),

crates/nu-cli/src/reedline_config.rs

@@ -222,7 +222,7 @@ fn add_menu_keybindings(keybindings: &mut Keybindings) {
         KeyModifiers::NONE,
         KeyCode::Tab,
         ReedlineEvent::UntilFound(vec![
-            ReedlineEvent::Menu("completer_menu".to_string()),
+            ReedlineEvent::Menu("completion_menu".to_string()),
             ReedlineEvent::MenuNext,
         ]),
     );
@@ -255,7 +255,7 @@ fn add_menu_keybindings(keybindings: &mut Keybindings) {
     // Help menu keybinding
     keybindings.add_binding(
         KeyModifiers::CONTROL,
-        KeyCode::Char('i'),
+        KeyCode::Char('q'),
         ReedlineEvent::Menu("help_menu".to_string()),
     );
 }

docs/sample_config/default_config.nu

@@ -221,7 +221,7 @@ let $config = {
     text_style: green
     selected_text_style: green_reverse
     description_text_style: yellow
-    marker: "% "
+    marker: "? "
   }
   keybindings: [
     {