imag-store: Replace error code with code generator macro

imag-store/Cargo.toml

@@ -19,3 +19,6 @@ path = "../libimagrt"
 [dependencies.libimagutil]
 path = "../libimagutil"
 
+[dependencies.libimagerror]
+path = "../libimagerror"
+

imag-store/src/error.rs

@@ -1,75 +1,9 @@
 use std::error::Error;
 use std::fmt::Error as FmtError;
-use std::clone::Clone;
 use std::fmt::{Display, Formatter};
 
-#[derive(Clone, Copy, Debug, PartialEq)]
-/// Kind of store error
-pub enum StoreErrorKind {
-    BackendError,
-    NoCommandlineCall,
-    // maybe more
-}
-
-fn store_error_type_as_str(e: &StoreErrorKind) -> &'static str {
-    match *e {
-        StoreErrorKind::BackendError      => "Backend Error",
-        StoreErrorKind::NoCommandlineCall => "No commandline call",
-    }
-}
-
-impl Display for StoreErrorKind {
-
-    fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
-        try!(write!(fmt, "{}", store_error_type_as_str(self)));
-        Ok(())
-    }
-
-}
-
-#[derive(Debug)]
-pub struct StoreError {
-    err_type: StoreErrorKind,
-    cause: Option<Box<Error>>,
-}
-
-impl StoreError {
-
-    ///Build a new StoreError from an StoreErrorKind, optionally with cause
-    pub fn new(errtype: StoreErrorKind, cause: Option<Box<Error>>)
-        -> StoreError
-        {
-            StoreError {
-                err_type: errtype,
-                cause: cause,
-            }
-        }
-
-    /// Get the error type of this StoreError
-    pub fn err_type(&self) -> StoreErrorKind {
-        self.err_type
-    }
-
-}
-
-impl Display for StoreError {
-
-    fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
-        try!(write!(fmt, "[{}]", store_error_type_as_str(&self.err_type.clone())));
-        Ok(())
-    }
-
-}
-
-impl Error for StoreError {
-
-    fn description(&self) -> &str {
-        store_error_type_as_str(&self.err_type)
-    }
-
-    fn cause(&self) -> Option<&Error> {
-        self.cause.as_ref().map(|e| &**e)
-    }
-
-}
+generate_error_types!(StoreError, StoreErrorKind,
+    BackendError      => "Backend Error",
+    NoCommandlineCall => "No commandline call"
+);
 

imag-store/src/main.rs

@@ -22,6 +22,7 @@ extern crate toml;
 extern crate libimagrt;
 extern crate libimagstore;
 extern crate libimagutil;
+#[macro_use] extern crate libimagerror;
 
 use libimagrt::runtime::Runtime;
 use std::process::exit;