anime: CLI and user-daemon work

daemon-user/src/error.rs

@@ -0,0 +1,37 @@
+use std::fmt;
+
+use rog_anime::error::AnimeError;
+
+#[derive(Debug)]
+pub enum Error {
+    Io(std::io::Error),
+    ConfigLoadFail,
+    XdgVars,
+    Anime(AnimeError),
+}
+
+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::Io(err) => write!(f, "Failed to open: {}", err),
+            Error::ConfigLoadFail => write!(f, "Failed to load user config"),
+            Error::XdgVars => write!(f, "XDG environment vars appear unset"),
+            Error::Anime(err) => write!(f, "Anime error: {}", err),
+        }
+    }
+}
+
+impl std::error::Error for Error {}
+
+impl From<std::io::Error> for Error {
+    fn from(err: std::io::Error) -> Self {
+        Error::Io(err)
+    }
+}
+
+impl From<AnimeError> for Error {
+    fn from(err: AnimeError) -> Self {
+        Error::Anime(err)
+    }
+}