added a way to search through list, ref rust-lang#2093

Author: frroossst

src/exercise.rs

@@ -55,6 +55,7 @@ fn run_bin(
 }
 
 /// See `info_file::ExerciseInfo`
+#[derive(Debug)]
 pub struct Exercise {
     pub dir: Option<&'static str>,
     pub name: &'static str,

src/list.rs

@@ -1,4 +1,4 @@
-use anyhow::{Context, Result};
+use anyhow::{Context, Ok, Result};
 use crossterm::{
     cursor,
     event::{
@@ -21,6 +21,7 @@ mod state;
 
 fn handle_list(app_state: &mut AppState, stdout: &mut StdoutLock) -> Result<()> {
     let mut list_state = ListState::new(app_state, stdout)?;
+    let mut is_searching = false;
 
     loop {
         match event::read().context("Failed to read terminal event")? {
@@ -31,9 +32,50 @@ fn handle_list(app_state: &mut AppState, stdout: &mut StdoutLock) -> Result<()>
                 }
 
                 list_state.message.clear();
+                
+                let curr_key = key.code;
+                
+                if is_searching {
+                    match curr_key {
+                        KeyCode::Esc | KeyCode::Enter => {
+                            is_searching = false; // not sure why rust analyzer thinks this is unused
+                            list_state.search_query.clear();
+                            return Ok(());
+                        }
+                        KeyCode::Char(k) => {
+                            eprintln!("pressed while searching {:?}", curr_key);
+
+                            list_state.search_query.push(k);
+                            list_state.message.push_str("search:");
+                            list_state.message.push_str(&list_state.search_query);
+                            list_state.message.push_str("|");
+                            
+                            list_state.select_if_matches_search_query();
+                            
+                            list_state.draw(stdout)?;
+                            continue;
+                        }
+                        KeyCode::Backspace => {
+                            list_state.search_query.pop();
+                            list_state.message.push_str("search:");
+                            list_state.message.push_str(&list_state.search_query);
+                            list_state.message.push_str("|");
+
+                            list_state.select_if_matches_search_query();
+
+                            list_state.draw(stdout)?;
+                            continue;
+                        }
+                        _ => {
+                            continue;
+                        }
+                    }
+                }
 
                 match key.code {
-                    KeyCode::Char('q') => return Ok(()),
+                    KeyCode::Char('q') => {
+                        return Ok(());
+                    }
                     KeyCode::Down | KeyCode::Char('j') => list_state.select_next(),
                     KeyCode::Up | KeyCode::Char('k') => list_state.select_previous(),
                     KeyCode::Home | KeyCode::Char('g') => list_state.select_first(),
@@ -66,9 +108,16 @@ fn handle_list(app_state: &mut AppState, stdout: &mut StdoutLock) -> Result<()>
                             return Ok(());
                         }
                     }
+                    KeyCode::Char('s') | KeyCode::Char('/') => {
+                        eprintln!("starting search");
+                        list_state.message.push_str("search:|");
+                        is_searching = true;
+                    }
                     // Redraw to remove the message.
                     KeyCode::Esc => (),
-                    _ => continue,
+                    _ => {
+                        continue;
+                    }
                 }
             }
             Event::Mouse(event) => match event.kind {

src/list/scroll_state.rs

@@ -46,7 +46,7 @@ impl ScrollState {
         self.selected
     }
 
-    fn set_selected(&mut self, selected: usize) {
+    pub fn set_selected(&mut self, selected: usize) {
         self.selected = Some(selected);
         self.update_offset();
     }

src/list/state.rs

@@ -45,6 +45,7 @@ pub struct ListState<'a> {
     term_height: u16,
     separator_line: Vec<u8>,
     show_footer: bool,
+    pub search_query: String,
 }
 
 impl<'a> ListState<'a> {
@@ -78,6 +79,7 @@ impl<'a> ListState<'a> {
             term_height: 0,
             separator_line: Vec::new(),
             show_footer: true,
+            search_query: String::new(),
         };
 
         slf.set_term_size(width, height);
@@ -356,6 +358,41 @@ impl<'a> ListState<'a> {
 
         Ok(())
     }
+    
+    pub fn select_if_matches_search_query(&mut self) {
+        eprintln!("search query: {:?}", self.search_query); 
+
+        let idx = self
+            .app_state
+            .exercises()
+            .iter()
+            .enumerate()
+            .find_map(|(i, s)| {
+                if s.name.contains(self.search_query.as_str()) {
+                    Some(i)
+                } else {
+                    None
+                }
+            });
+        eprintln!("idx: {:?}", idx);
+        
+        match idx {
+            Some(i) => {
+                // ? do we need this function call?
+                // let exercise_ind = self.selected_to_exercise_ind(i).unwrap();
+                let exercise_ind = i;
+                self.scroll_state.set_selected(exercise_ind);
+                eprintln!("exercise_ind: {:?}", exercise_ind);
+                self.update_rows();
+            }
+            None => {
+                let msg = String::from("[NOT FOUND]") + &self.message.clone();
+                self.message.clear();
+                self.message.push_str(&msg);
+            }
+        }
+        
+    }
 
     // Return `true` if there was something to select.
     pub fn selected_to_current_exercise(&mut self) -> Result<bool> {