added search state

src/app.rs

@@ -1,7 +1,7 @@
-pub enum InputMode {
-    Normal,
-    Editing,
-}
+use crate::{
+    models::states::InputMode,
+    routes::{ActiveBlock, Route},
+};
 
 // App holds the state of the application
 pub struct App {
@@ -11,14 +11,99 @@ pub struct App {
     pub messages: Vec<String>,
     // Current input into search bar
     pub input: String,
+    /// whether to show help dialogue
+    pub show_help: bool,
+    /// Position of the cursor
+    pub cursor_position: usize,
+    /// Current route
+    pub routes: Vec<Route>,
 }
 
 impl App {
     pub fn default() -> App {
         App {
+            cursor_position: 0,
             input: "".to_owned(),
             input_mode: InputMode::Normal,
             messages: Vec::new(),
+            routes: vec![Route::default()],
+            show_help: false,
+        }
+    }
+
+    pub fn pop_current_route(&mut self) {
+        if self.routes.len() > 1 {
+            self.routes.pop();
+        }
+    }
+
+    pub fn get_current_route(&self) -> Route {
+        self.routes
+            .last()
+            .map_or(Route::default(), |route| route.to_owned())
+    }
+
+    pub fn set_route(&mut self, route: Route) {
+        self.routes.push(route);
+    }
+
+    pub fn change_active_block(&mut self, active_block: ActiveBlock) {
+        let current_route = self.get_current_route();
+        self.routes.pop();
+        self.routes
+            .push(Route::new(current_route.get_id(), active_block));
+    }
+
+    pub fn move_cursor_left(&mut self) {
+        let cursor_moved_left = self.cursor_position.saturating_sub(1);
+        self.cursor_position = self.clamp_cursor(cursor_moved_left);
+    }
+
+    pub fn move_cursor_right(&mut self) {
+        let cursor_moved_right = self.cursor_position.saturating_add(1);
+        self.cursor_position = self.clamp_cursor(cursor_moved_right);
+    }
+
+    pub fn enter_char(&mut self, new_char: char) {
+        self.input.insert(self.cursor_position, new_char);
+
+        self.move_cursor_right();
+    }
+
+    pub fn paste(&mut self, data: String) {
+        self.input = format!("{}{}", self.input, data);
+        for _ in 0..data.len() {
+            self.move_cursor_right();
         }
     }
+
+    pub fn delete_char(&mut self) {
+        let is_not_cursor_leftmost = self.cursor_position != 0;
+        if is_not_cursor_leftmost {
+            // Method "remove" is not used on the saved text for deleting the selected char.
+            // Reason: Using remove on String works on bytes instead of the chars.
+            // Using remove would require special care because of char boundaries.
+
+            let current_index = self.cursor_position;
+            let from_left_to_current_index = current_index - 1;
+
+            // Getting all characters before the selected character.
+            let before_char_to_delete = self.input.chars().take(from_left_to_current_index);
+            // Getting all characters after selected character.
+            let after_char_to_delete = self.input.chars().skip(current_index);
+
+            // Put all characters together except the selected one.
+            // By leaving the selected one out, it is forgotten and therefore deleted.
+            self.input = before_char_to_delete.chain(after_char_to_delete).collect();
+            self.move_cursor_left();
+        }
+    }
+
+    pub fn clamp_cursor(&self, new_cursor_pos: usize) -> usize {
+        new_cursor_pos.clamp(0, self.input.len())
+    }
+
+    pub fn reset_cursor(&mut self) {
+        self.cursor_position = 0;
+    }
 }

src/main.rs

@@ -4,12 +4,13 @@ use std::sync::{mpsc, Arc};
 use std::thread;
 use std::time::{Duration, Instant};
 
-use app::{App, InputMode};
+use app::App;
 use crossterm::{
     event::{self, Event as CEvent, KeyCode},
     terminal::{disable_raw_mode, enable_raw_mode},
 };
 
+use models::states::InputMode;
 use ratatui::{
     backend::CrosstermBackend,
     layout::{Constraint, Direction, Layout},
@@ -23,6 +24,7 @@ use widgets::welcome::render_welcome;
 mod app;
 mod models;
 mod network;
+mod routes;
 mod util;
 mod widgets;
 

src/models/mod.rs

@@ -1 +1,2 @@
 pub mod position;
+pub mod states;

src/models/states.rs

@@ -0,0 +1,45 @@
+pub enum InputMode {
+    Normal,
+    Editing,
+}
+
+pub struct Query {
+    pub query: String,
+    pub error_message: Option<String>,
+}
+
+pub struct AppSearchState {
+    pub current_search_query: String,
+    pub cursor_position: usize,
+    pub input_mode: InputMode,
+    pub is_invalid_search: bool,
+    pub is_blank_search: bool,
+    pub query: Option<Query>,
+}
+
+impl Default for AppSearchState {
+    fn default() -> Self {
+        AppSearchState {
+            current_search_query: "".to_owned(),
+            cursor_position: 0,
+            input_mode: InputMode::Normal,
+            is_invalid_search: false,
+            is_blank_search: false,
+            query: None,
+        }
+    }
+}
+
+impl AppSearchState {
+    /// Resets the [`AppSearchState`] to its default state, albeit still enabled.
+    pub fn reset(&mut self) {
+        *self = AppSearchState {
+            ..AppSearchState::default()
+        }
+    }
+
+    /// Returns whether the [`AppSearchState`] has an invalid or blank search.
+    pub fn is_invalid_or_blank_search(&self) -> bool {
+        self.is_blank_search || self.is_invalid_search
+    }
+}

src/routes.rs

@@ -0,0 +1,40 @@
+#[derive(Clone)]
+pub enum RouteId {
+    Welcome,
+    Searching(String),
+}
+
+#[derive(Clone, Copy, PartialEq, Debug)]
+pub enum ActiveBlock {
+    SearchBar,
+    Main,
+}
+
+#[derive(Clone)]
+pub struct Route {
+    id: RouteId,
+    active_block: ActiveBlock,
+}
+
+impl Route {
+    pub fn new(id: RouteId, active_block: ActiveBlock) -> Self {
+        Self { id, active_block }
+    }
+
+    pub fn get_active_block(&self) -> ActiveBlock {
+        self.active_block
+    }
+
+    pub fn get_id(&self) -> RouteId {
+        self.id.to_owned()
+    }
+}
+
+impl Default for Route {
+    fn default() -> Self {
+        Self {
+            id: RouteId::Welcome,
+            active_block: ActiveBlock::SearchBar,
+        }
+    }
+}