fix parsing color

README.md

@@ -45,12 +45,23 @@ You can press `Space` key to _pause_ and _resume_ the timer.
 ## Run stopwatch
 
 ```shell
-# Start timer for 5 minutes
 $ tclock stopwatch
 ```
 
 You can press `Space` key to _pause_ and _resume_ the stopwatch.
 
+## Customize style
+
+You can customize the styles.
+
+* Size
+
+You can use `-s` or `--size` option to custome clock size, for example:
+
+```shell
+$ tclock -s 2
+```
+
 # License
 
 MIT License.

src/app.rs

@@ -146,9 +146,9 @@ fn parse_color(s: &str) -> Result<Color, String> {
                 .captures(s)
                 .ok_or_else(|| format!("Invalid color: {}", s))?;
             let hex = cap.get(1).unwrap().as_str();
-            let r = hex[1..3].parse::<u8>().unwrap();
-            let g = hex[3..5].parse::<u8>().unwrap();
-            let b = hex[5..7].parse::<u8>().unwrap();
+            let r = u8::from_str_radix(&hex[0..2], 16).unwrap();
+            let g = u8::from_str_radix(&hex[2..4], 16).unwrap();
+            let b = u8::from_str_radix(&hex[4..], 16).unwrap();
             Ok(Color::Rgb(r, g, b))
         }
     }