Remove copypasta and maintain our own fork

x11/src/error.rs

@@ -0,0 +1,63 @@
+use xcb::Atom;
+use xcb::base::{ ConnError, GenericError };
+use std::fmt;
+use std::sync::mpsc::SendError;
+use std::error::Error as StdError;
+
+#[must_use]
+#[derive(Debug)]
+pub enum Error {
+    Set(SendError<Atom>),
+    XcbConn(ConnError),
+    XcbGeneric(GenericError),
+    Lock,
+    Timeout,
+    Owner,
+    UnexpectedType(Atom),
+
+    #[doc(hidden)]
+    __Unknown
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        use self::Error::*;
+        match self {
+            Set(e) => write!(f, "XCB - couldn't set atom: {:?}", e),
+            XcbConn(e) => write!(f, "XCB connection error: {:?}", e),
+            XcbGeneric(e) => write!(f, "XCB generic error: {:?}", e),
+            Lock => write!(f, "XCB: Lock is poisoned"),
+            Timeout => write!(f, "Selection timed out"),
+            Owner => write!(f, "Failed to set new owner of XCB selection"),
+            UnexpectedType(target) => write!(f, "Unexpected Reply type: {}", target),
+            __Unknown => unreachable!()
+        }
+    }
+}
+
+impl StdError for Error {
+    fn source(&self) -> Option<&(dyn StdError + 'static)> {
+        use self::Error::*;
+        match self {
+            Set(e) => Some(e),
+            XcbConn(e) => Some(e),
+            XcbGeneric(e) => Some(e),
+            Lock | Timeout | Owner | UnexpectedType(_) => None,
+            __Unknown => unreachable!()
+        }
+    }
+}
+
+macro_rules! define_from {
+    ( $item:ident from $err:ty ) => {
+        impl From<$err> for Error {
+            fn from(err: $err) -> Error {
+                Error::$item(err)
+            }
+        }
+    }
+}
+
+define_from!(Set from SendError<Atom>);
+define_from!(XcbConn from ConnError);
+define_from!(XcbGeneric from GenericError);