completion highlighting

helix-term/src/application.rs

@@ -243,7 +243,7 @@ impl Renderer {
             for i in (3..7) {
                 self.surface.set_string(
                     0,
-                    self.size.1 - i,
+                    self.size.1 - i as u16,
                     " ".repeat(self.size.0 as usize),
                     self.text_color,
                 );
@@ -253,12 +253,23 @@ impl Renderer {
                 view.theme.get("ui.statusline"),
             );
             for i in (0..completion.len()) {
-                self.surface.set_string(
-                    1,
-                    self.size.1 - 6 + i as u16,
-                    &completion[i],
-                    self.text_color,
-                )
+                if prompt.completion_selection_index.is_some()
+                    && i == prompt.completion_selection_index.unwrap()
+                {
+                    self.surface.set_string(
+                        1,
+                        self.size.1 - 6 + i as u16,
+                        &completion[i],
+                        Style::default().bg(Color::Rgb(104, 060, 232)),
+                    );
+                } else {
+                    self.surface.set_string(
+                        1,
+                        self.size.1 - 6 + i as u16,
+                        &completion[i],
+                        self.text_color,
+                    );
+                }
             }
         }
         // render buffer text
@@ -409,16 +420,24 @@ impl Application {
                                     ..
                                 }] = keys.as_slice()
                                 {
+                                    let command_list = vec![
+                                        String::from("q"),
+                                        String::from("aaa"),
+                                        String::from("bbb"),
+                                        String::from("ccc"),
+                                    ];
+
                                     let prompt = Prompt::new(
                                         ":".to_owned(),
                                         |_input: &str| {
+                                            let mut matches = vec![];
+                                            // TODO: i need this duplicate list right now to avoid borrow checker issues
                                             let placeholder_list = vec![
                                                 String::from("q"),
                                                 String::from("aaa"),
                                                 String::from("bbb"),
                                                 String::from("ccc"),
                                             ];
-                                            let mut matches = vec![];
                                             for command in placeholder_list {
                                                 if command.contains(_input) {
                                                     matches.push(command);
@@ -433,6 +452,7 @@ impl Application {
                                             "q" => editor.should_close = true,
                                             _ => (),
                                         },
+                                        command_list,
                                     );
 
                                     self.prompt = Some(prompt);

helix-view/src/prompt.rs

@@ -8,6 +8,7 @@ pub struct Prompt {
     pub cursor: usize,
     pub completion: Option<Vec<String>>,
     pub should_close: bool,
+    pub completion_selection_index: Option<usize>,
     completion_fn: Box<dyn FnMut(&str) -> Option<Vec<String>>>,
     callback_fn: Box<dyn FnMut(&mut Editor, &str)>,
 }
@@ -17,13 +18,15 @@ impl Prompt {
         prompt: String,
         completion_fn: impl FnMut(&str) -> Option<Vec<String>> + 'static,
         callback_fn: impl FnMut(&mut Editor, &str) + 'static,
+        command_list: Vec<String>,
     ) -> Prompt {
         Prompt {
             prompt,
             line: String::new(),
             cursor: 0,
-            completion: None,
+            completion: Some(command_list),
             should_close: false,
+            completion_selection_index: None,
             completion_fn: Box::new(completion_fn),
             callback_fn: Box::new(callback_fn),
         }
@@ -32,6 +35,7 @@ impl Prompt {
     pub fn insert_char(&mut self, c: char) {
         self.line.insert(self.cursor, c);
         self.cursor += 1;
+        self.completion = (self.completion_fn)(&self.line);
     }
 
     pub fn move_char_left(&mut self) {
@@ -58,6 +62,15 @@ impl Prompt {
         if self.cursor > 0 {
             self.line.remove(self.cursor - 1);
             self.cursor -= 1;
+            self.completion = (self.completion_fn)(&self.line);
+        }
+    }
+
+    pub fn change_completion_selection(&mut self) {
+        if self.completion_selection_index.is_none() {
+            self.completion_selection_index = Some(0)
+        } else {
+            self.completion_selection_index = Some(self.completion_selection_index.unwrap() + 1)
         }
     }
 
@@ -96,9 +109,7 @@ impl Prompt {
             } => (self.callback_fn)(editor, &self.line),
             KeyEvent {
                 code: KeyCode::Tab, ..
-            } => {
-                self.completion = (self.completion_fn)(&self.line);
-            }
+            } => self.change_completion_selection(),
             _ => (),
         }
     }