Add hex support

README.md

@@ -21,6 +21,7 @@ Coloring terminal so simple, you already know how to do it!
     "purple and magenta are the same".purple().magenta();
     "and so are normal and clear".normal().clear();
     "you can specify color by string".color("blue").on_color("red");
+    "you can also use hex colors".color("#0057B7").on_color("#fd0");
     String::from("this also works!").green().bold();
     format!("{:30}", "format works as expected. This will be padded".blue());
     format!("{:.3}", "and this will be green but truncated to 3 chars".green());

src/color.rs

@@ -231,11 +231,31 @@ impl FromStr for Color {
             "bright magenta" => Ok(Self::BrightMagenta),
             "bright cyan" => Ok(Self::BrightCyan),
             "bright white" => Ok(Self::BrightWhite),
+            s if s.starts_with('#') => parse_hex(&s[1..]).ok_or(()),
             _ => Err(()),
         }
     }
 }
 
+fn parse_hex(s: &str) -> Option<Color> {
+    if s.len() == 6 {
+        let r = u8::from_str_radix(&s[0..2], 16).ok()?;
+        let g = u8::from_str_radix(&s[2..4], 16).ok()?;
+        let b = u8::from_str_radix(&s[4..6], 16).ok()?;
+        Some(Color::TrueColor { r, g, b })
+    } else if s.len() == 3 {
+        let r = u8::from_str_radix(&s[0..1], 16).ok()?;
+        let r = r | (r << 4);
+        let g = u8::from_str_radix(&s[1..2], 16).ok()?;
+        let g = g | (g << 4);
+        let b = u8::from_str_radix(&s[2..3], 16).ok()?;
+        let b = b | (b << 4);
+        Some(Color::TrueColor { r, g, b })
+    } else {
+        None
+    }
+}
+
 #[cfg(test)]
 mod tests {
     pub use super::*;
@@ -277,7 +297,17 @@ mod tests {
 
             invalid: "invalid" => Color::White,
             capitalized: "BLUE" => Color::Blue,
-            mixed_case: "bLuE" => Color::Blue
+            mixed_case: "bLuE" => Color::Blue,
+
+            hex3_lower: "#abc" => Color::TrueColor { r: 170, g: 187, b: 204 },
+            hex3_upper: "#ABC" => Color::TrueColor { r: 170, g: 187, b: 204 },
+            hex3_mixed: "#aBc" => Color::TrueColor { r: 170, g: 187, b: 204 },
+            hex6_lower: "#abcdef" => Color::TrueColor { r: 171, g: 205, b: 239 },
+            hex6_upper: "#ABCDEF" => Color::TrueColor { r: 171, g: 205, b: 239 },
+            hex6_mixed: "#aBcDeF" => Color::TrueColor { r: 171, g: 205, b: 239 },
+            hex_too_short: "#aa" => Color::White,
+            hex_too_long: "#aaabbbccc" => Color::White,
+            hex_invalid: "#abcxyz" => Color::White
         );
     }
 
@@ -318,7 +348,17 @@ mod tests {
 
             invalid: "invalid" => Color::White,
             capitalized: "BLUE" => Color::Blue,
-            mixed_case: "bLuE" => Color::Blue
+            mixed_case: "bLuE" => Color::Blue,
+
+            hex3_lower: "#abc" => Color::TrueColor { r: 170, g: 187, b: 204 },
+            hex3_upper: "#ABC" => Color::TrueColor { r: 170, g: 187, b: 204 },
+            hex3_mixed: "#aBc" => Color::TrueColor { r: 170, g: 187, b: 204 },
+            hex6_lower: "#abcdef" => Color::TrueColor { r: 171, g: 205, b: 239 },
+            hex6_upper: "#ABCDEF" => Color::TrueColor { r: 171, g: 205, b: 239 },
+            hex6_mixed: "#aBcDeF" => Color::TrueColor { r: 171, g: 205, b: 239 },
+            hex_too_short: "#aa" => Color::White,
+            hex_too_long: "#aaabbbccc" => Color::White,
+            hex_invalid: "#abcxyz" => Color::White
         );
     }