Implement `Error` for `NotmuchStatus`.

Entails implementation of `ToStr` and `Display`, also.

Note that the `to_str()` method uses the `to_static_str()` method on the
`ToStaticStr` trait internally --- this is how I expect to use the
latter.  This lets me provide a uniform `to_str()` method in the rest of
the API, while transparently handling the differences between C string
lifetimes.

1 files changed, 31 insertions, 1 deletions

diff --git a/src/ffi.rs b/src/ffi.rs
index 2ee99e0..45a1f17 100644
--- a/src/ffi.rs
+++ b/src/ffi.rs
@@ -11,7 +11,17 @@ use libc::{
     time_t,
 };
 
-use utils::NotmuchEnum;
+use std::{
+    error,
+    fmt,
+    str,
+};
+
+use utils::{
+    NotmuchEnum,
+    ToStaticStr,
+    ToStr,
+};
 
 pub type notmuch_bool_t = c_int;
 
@@ -56,6 +66,26 @@ impl notmuch_status_t {
     }
 }
 
+impl ToStr for NotmuchStatus {
+    fn to_str(&self) -> Result<&str, str::Utf8Error> {
+        unsafe {
+            notmuch_status_to_string(self.to_notmuch_t())
+        }.to_static_str()
+    }
+}
+
+impl fmt::Display for NotmuchStatus {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.to_str().unwrap())
+    }
+}
+
+impl error::Error for NotmuchStatus {
+    fn description(&self) -> &str {
+        self.to_str().unwrap()
+    }
+}
+
 notmuch_enum! {
     #[repr(C)]
     #[derive(Copy, Debug)]