Replace error code with macro for code generation

libimagstore/src/hook/error.rs

@@ -3,14 +3,10 @@ use std::fmt::Error as FmtError;
 use std::fmt::{Display, Formatter};
 use std::convert::Into;
 
-/**
- * Kind of error
- */
-#[derive(Clone, Copy, Debug)]
-pub enum HookErrorKind {
-    HookExecutionError,
-    AccessTypeViolation,
-}
+generate_error_types!(HookError, HookErrorKind,
+    HookExecutionError  => "Hook exec error",
+    AccessTypeViolation => "Hook access type violation"
+);
 
 pub trait IntoHookError {
     fn into_hookerror(self) -> HookError;
@@ -33,73 +29,3 @@ impl Into<HookError> for (HookErrorKind, Box<Error>) {
 
 }
 
-fn hook_error_type_as_str(e: &HookErrorKind) -> &'static str {
-    match *e {
-        HookErrorKind::HookExecutionError  => "Hook exec error",
-        HookErrorKind::AccessTypeViolation => "Hook access type violation",
-    }
-}
-
-impl Display for HookErrorKind {
-
-    fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
-        try!(write!(fmt, "{}", hook_error_type_as_str(self)));
-        Ok(())
-    }
-
-}
-
-/**
- * Error type
- */
-#[derive(Debug)]
-pub struct HookError {
-    err_type: HookErrorKind,
-    cause: Option<Box<Error>>,
-}
-
-impl HookError {
-
-    /**
-     * Build a new HookError from an HookErrorKind, optionally with cause
-     */
-    pub fn new(errtype: HookErrorKind, cause: Option<Box<Error>>)
-        -> HookError
-        {
-            HookError {
-                err_type: errtype,
-                cause: cause,
-            }
-        }
-
-    /**
-     * Get the error type of this HookError
-     */
-    pub fn err_type(&self) -> HookErrorKind {
-        self.err_type
-    }
-
-}
-
-impl Display for HookError {
-
-    fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
-        try!(write!(fmt, "[{}]", hook_error_type_as_str(&self.err_type)));
-        Ok(())
-    }
-
-}
-
-impl Error for HookError {
-
-    fn description(&self) -> &str {
-        hook_error_type_as_str(&self.err_type)
-    }
-
-    fn cause(&self) -> Option<&Error> {
-        self.cause.as_ref().map(|e| &**e)
-    }
-
-}
-
-