Begin rog-aura crate

rog-aura/src/error.rs

@@ -0,0 +1,26 @@
+use std::error;
+use std::fmt;
+
+#[derive(Debug)]
+pub enum Error {
+    ParseColour,
+    ParseSpeed,
+    ParseDirection,
+    ParseBrightness,
+    ParseAnime,
+}
+
+impl fmt::Display for Error {
+    // This trait requires `fmt` with this exact signature.
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            Error::ParseColour => write!(f, "Could not parse colour"),
+            Error::ParseSpeed => write!(f, "Could not parse speed"),
+            Error::ParseDirection => write!(f, "Could not parse direction"),
+            Error::ParseBrightness => write!(f, "Could not parse brightness"),
+            Error::ParseAnime => write!(f, "Could not parse anime"),
+        }
+    }
+}
+
+impl error::Error for Error {}