Add Alias#update_alias_id

This function takes a list of aliases and updates the current `Alias`'s
alias using an auto-incremented numeric id.

Not happy with the repetition in the tests. Need to figure out if
there's a way to abstract that.

2 files changed, 38 insertions, 0 deletions

diff --git a/src/main.rs b/src/main.rs
index fdeab31..89deb49 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -48,6 +48,12 @@ impl Alias {
             format!("alias {} {} {}", self.alias, self.name, self.email)
         }
     }
+
+    fn update_alias_id(&mut self, similar_aliases: Vec<String>) {
+        if !similar_aliases.is_empty() {
+            self.alias = format!("{}-{}", self.alias, similar_aliases.len() + 1);
+        }
+    }
 }
 
 fn handle_alias(s: &str) {
diff --git a/src/tests.rs b/src/tests.rs
index 0dc3901..f877408 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -88,3 +88,35 @@ fn find_alias_in_file_finds_a_match() {
         )
     );
 }
+
+
+#[test]
+fn update_alias_id_does_nothing_given_an_empty_vector() {
+    let alias_identifier = "hooves-derpy";
+    let mut alias = Alias {
+        alias: alias_identifier.to_owned(),
+        name: "Derpy Hooves".to_owned(),
+        email: "derpyhooves@postmaster.pv".to_owned()
+    };
+    alias.update_alias_id(vec![]);
+
+    assert_eq!(alias_identifier, &alias.alias);
+}
+
+#[test]
+fn update_alias_id_increments_alias() {
+    let alias_identifier = "hooves-derpy";
+    let mut alias = Alias {
+        alias: alias_identifier.to_owned(),
+        name: "Derpy Hooves".to_owned(),
+        email: "derpyhooves@postmaster.pv".to_owned()
+    };
+    alias.update_alias_id(vec![
+        "hooves-derpy".to_owned(),
+        "hooves-derpy-2".to_owned(),
+        "hooves-derpy-3".to_owned(),
+        "hooves-derpy-4".to_owned()
+    ]);
+
+    assert_eq!("hooves-derpy-5", &alias.alias);
+}