libimagentrytag: Replace error code with code generator macro

libimagentrytag/Cargo.toml

@@ -13,3 +13,6 @@ itertools = "0.4"
 [dependencies.libimagstore]
 path = "../libimagstore"
 
+[dependencies.libimagerror]
+path = "../libimagerror"
+

libimagentrytag/src/error.rs

@@ -2,67 +2,10 @@ use std::error::Error;
 use std::fmt::Error as FmtError;
 use std::fmt::{Display, Formatter};
 
-#[derive(Clone, Copy, Debug, PartialEq)]
-pub enum TagErrorKind {
-    TagTypeError,
-    HeaderReadError,
-    HeaderWriteError,
-    NotATag,
-}
-
-fn tag_error_type_as_str(e: &TagErrorKind) -> &'static str {
-    match *e {
-        TagErrorKind::TagTypeError     => "Entry Header Tag Type wrong",
-        TagErrorKind::HeaderReadError  => "Error while reading entry header",
-        TagErrorKind::HeaderWriteError => "Error while writing entry header",
-        TagErrorKind::NotATag          => "String is not a tag",
-    }
-}
-
-impl Display for TagErrorKind {
-
-    fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
-        try!(write!(fmt, "{}", tag_error_type_as_str(self)));
-        Ok(())
-    }
-
-}
-
-#[derive(Debug)]
-pub struct TagError {
-    kind: TagErrorKind,
-    cause: Option<Box<Error>>,
-}
-
-impl TagError {
-
-    pub fn new(errtype: TagErrorKind, cause: Option<Box<Error>>) -> TagError {
-        TagError {
-            kind: errtype,
-            cause: cause,
-        }
-    }
-
-}
-
-impl Display for TagError {
-
-    fn fmt(&self, fmt: &mut Formatter) -> Result<(), FmtError> {
-        try!(write!(fmt, "[{}]", tag_error_type_as_str(&self.kind)));
-        Ok(())
-    }
-
-}
-
-impl Error for TagError {
-
-    fn description(&self) -> &str {
-        tag_error_type_as_str(&self.kind)
-    }
-
-    fn cause(&self) -> Option<&Error> {
-        self.cause.as_ref().map(|e| &**e)
-    }
-
-}
+generate_error_types!(TagError, TagErrorKind,
+    TagTypeError     => "Entry Header Tag Type wrong",
+    HeaderReadError  => "Error while reading entry header",
+    HeaderWriteError => "Error while writing entry header",
+    NotATag          => "String is not a tag"
+);
 

libimagentrytag/src/lib.rs

@@ -19,6 +19,7 @@ extern crate regex;
 extern crate toml;
 
 extern crate libimagstore;
+#[macro_use] extern crate libimagerror;
 
 pub mod error;
 pub mod exec;