Show manual

extract playing the game and the manual from main

src/main.rs

@@ -1,4 +1,5 @@
-use std::io::Result;
+use std::cmp::min;
+use std::io::{Result, Stdout};
 use std::io::stdout;
 use std::string::ToString;
 use std::time::Instant;
@@ -48,47 +49,26 @@ struct CliOptions {
 fn main() -> Result<()> {
     let cli_options = CliOptions::parse();
 
-
-    let player_stats = PlayerStats::create_random();
-    let mut game = Game::new(Player::new(realname().as_str(), player_stats));
-
     stdout().execute(EnterAlternateScreen)?;
     enable_raw_mode()?;
     let mut terminal = Terminal::new(CrosstermBackend::new(stdout()))?;
     terminal.clear()?;
 
     if cli_options.manual {
-        loop {
+        show_manual(&mut terminal);
-            let _ = terminal.draw(|frame| {
-                let mut area = frame.size();
-                let w = area.width / 2;
-                let h = area.height / 2;
-                area.x += w - 20;
-                area.y += h - 10;
-                area.width = 40;
-                area.height = 20;
-                let block = Block::default()
-                    .title(Title::from(" Manual ").alignment(Alignment::Center).position(Position::Top))
-                    .title(Title::from("Press `q` to quit!").position(Position::Bottom))
-                    .borders(Borders::ALL)
-                    .border_style(Style::default().fg(Color::White))
-                    .border_type(BorderType::Rounded)
-                    .style(Style::default().bg(Color::Black));
-                let mut text = "To control your character (depicted by the 8) you can use the cursor keys. \n\n\
-                To interact simply walk into the entity to interact with. Possible entities are creates \
-                (depicted by C), potions (depicted by P) or enemies.".to_string();
-                let paragraph = Paragraph::new(text).block(block).wrap(Wrap { trim: true });
-                frame.render_widget(paragraph, area);
-            });
-            if event::poll(std::time::Duration::from_millis(16))? {
-                if let event::Event::Key(key) = event::read()? {
-                    if key.kind == KeyEventKind::Press && key.code == KeyCode::Char('q') {
-                        break;
-                    }
-                }
-            }
-        }
     } else {
+        play_game(&mut terminal)?;
+    }
+
+    stdout().execute(LeaveAlternateScreen)?;
+    disable_raw_mode()?;
+    Ok(())
+}
+
+/// play the game ;)
+fn play_game(terminal: &mut Terminal<CrosstermBackend<Stdout>>) -> Result<()> {
+    let player_stats = PlayerStats::create_random();
+    let mut game = Game::new(Player::new(realname().as_str(), player_stats));
     let start_time = Instant::now();
     let mut ticks = 0;
     loop {
@@ -268,9 +248,51 @@ fn main() -> Result<()> {
             }
         }
     }
-    }
-
-    stdout().execute(LeaveAlternateScreen)?;
-    disable_raw_mode()?;
     Ok(())
 }
+
+/// this function shows some manual text
+fn show_manual(terminal: &mut Terminal<CrosstermBackend<Stdout>>) {
+    let mut page = 0;
+    let pages = [
+        "Background story\n\n\
+        You are a traveller and on your journey....
+        ".to_string(),
+        "To control your character (depicted by the 8) you can use the cursor keys (←, ↑, →, ↓). \n\n\
+                To interact simply walk into the entity to interact with. Possible entities are creates \
+                (depicted by C), potions (depicted by P) or enemies.".to_string(),
+    ];
+    loop {
+        let _ = terminal.draw(|frame| {
+            let mut area = frame.size();
+            let w = area.width / 2;
+            let h = area.height / 2;
+            area.x += w - 20;
+            area.y += h - 10;
+            area.width = 40;
+            area.height = 20;
+            let block = Block::default()
+                .title(Title::from(format!(" Manual ({}/{})", page + 1, pages.len())).alignment(Alignment::Center).position(Position::Top))
+                .title(Title::from("`q` to quit, `↑` and `↓` to scroll.").position(Position::Bottom))
+                .borders(Borders::ALL)
+                .border_style(Style::default().fg(Color::White))
+                .border_type(BorderType::Rounded)
+                .style(Style::default().bg(Color::Black));
+            let paragraph = Paragraph::new(pages[page].as_str()).block(block).wrap(Wrap { trim: true });
+            frame.render_widget(paragraph, area);
+        });
+        if event::poll(std::time::Duration::from_millis(16)).unwrap_or(false) {
+            if let event::Event::Key(key) = event::read().unwrap() {
+                if key.kind == KeyEventKind::Press && key.code == KeyCode::Char('q') {
+                    break;
+                }
+                if key.kind == KeyEventKind::Press && key.code == KeyCode::Up {
+                    page = page.saturating_sub(1);
+                }
+                if key.kind == KeyEventKind::Press && key.code == KeyCode::Down {
+                    page = min(pages.len() - 1, page + 1);
+                }
+            }
+        }
+    }
+}