Functional help bar

src/main.rs

@@ -2,7 +2,10 @@ use colored::*;
 use mosaic_tile::*;
 
 #[derive(Default)]
-struct State(usize, String);
+struct State {
+    lines: Vec<String>,
+    page: usize,
+}
 
 register_tile!(State);
 
@@ -12,12 +15,41 @@ impl MosaicTile for State {
     }
 
     fn draw(&mut self, _rows: usize, cols: usize) {
-        let line = format!("{}: {}", self.0, self.1);
-        println!("{:cols$}", line.reversed(), cols = cols);
+        let mut width = 0;
+        let more_msg = ", <?> More";
+        self.lines = vec![String::new()];
+        for item in get_help() {
+            if width + item.len() > cols - more_msg.len() {
+                self.lines.last_mut().unwrap().push_str(more_msg);
+                width = item.len();
+                self.lines.push(item);
+            } else {
+                let line = self.lines.last_mut().unwrap();
+                if !line.is_empty() {
+                    line.push_str(", ");
+                }
+                line.push_str(&item);
+                width += item.len() + 2;
+            }
+        }
+        let line = format!(
+            "{}{}",
+            self.lines[self.page],
+            if self.page > 0 && self.lines.len() == self.page + 1 {
+                ", <?> Back"
+            } else {
+                ""
+            }
+        );
+        println!("{}", line.italic());
     }
 
     fn handle_global_key(&mut self, key: Key) {
-        self.0 += 1;
-        self.1 = format!("{:?}", key);
+        if self.lines.len() > 1 {
+            if let Key::Char('?') = key {
+                self.page += 1;
+                self.page %= self.lines.len();
+            }
+        }
     }
 }