Add Role Eq/Ord impls

Roles can now be compared directly. This is a heirarchy check.
This checks the following between two roles, A and B:
- A's position is greater than B;
- if not, then A's Id is greater than B;
if these two conditions are false, then B is greater than A. If the two
conditions are both true, then they are of equivilance.

1 files changed, 33 insertions, 0 deletions

diff --git a/src/model/guild.rs b/src/model/guild.rs
index 7a3410f..6c5fab2 100644
--- a/src/model/guild.rs
+++ b/src/model/guild.rs
@@ -1,3 +1,4 @@
+use std::cmp::Ordering;
 use std::collections::HashMap;
 use std::fmt;
 use super::utils::{
@@ -1099,3 +1100,35 @@ impl fmt::Display for Role {
         fmt::Display::fmt(&self.mention(), f)
     }
 }
+
+impl Eq for Role {}
+
+impl Ord for Role {
+    fn cmp(&self, other: &Role) -> Ordering {
+        if self.position > other.position {
+            Ordering::Greater
+        } else if self.position == other.position {
+            if self.id > other.id {
+                Ordering::Greater
+            } else if self.id == other.id {
+                Ordering::Equal
+            } else {
+                Ordering::Less
+            }
+        } else {
+            Ordering::Less
+        }
+    }
+}
+
+impl PartialEq for Role {
+    fn eq(&self, other: &Role) -> bool {
+        self.id == other.id
+    }
+}
+
+impl PartialOrd for Role {
+    fn partial_cmp(&self, other: &Role) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}