Add change and expire accessors

examples/os.rs

@@ -1,6 +1,7 @@
 extern crate users;
 use users::{Users, Groups, UsersCache};
 use users::os::unix::{UserExt, GroupExt};
+//use users::os::bsd::UserExt as BSDUserExt;
 
 fn main() {
 	let cache = UsersCache::new();
@@ -13,6 +14,11 @@ fn main() {
 	println!("Your shell is {}", you.shell().display());
 	println!("Your home directory is {}", you.home_dir().display());
 
+    // The two fields below are only available on BSD systems.
+    // Linux systems don’t have the fields in their `passwd` structs!
+    //println!("Your password change timestamp is {}", you.password_change_time());
+    //println!("Your password expiry timestamp is {}", you.password_expire_time());
+
 	let primary_group = cache.get_group_by_gid(you.primary_group_id()).expect("No entry for your primary group!");
 	println!("Your primary group has ID {} and name {}", primary_group.gid(), primary_group.name());
 

src/base.rs

@@ -555,6 +555,26 @@ pub mod os {
             }
         }
 
+        /// BSD-specific accessors for `User`s.
+        pub trait UserExt {
+
+            /// Returns this user's password change timestamp.
+            fn password_change_time(&self) -> time_t;
+
+            /// Returns this user's password expiry timestamp.
+            fn password_expire_time(&self) -> time_t;
+        }
+
+        impl UserExt for User {
+            fn password_change_time(&self) -> time_t {
+                self.extras.change.clone()
+            }
+
+            fn password_expire_time(&self) -> time_t {
+                self.extras.expire.clone()
+            }
+        }
+
         impl Default for UserExtras {
             fn default() -> UserExtras {
                 UserExtras {