write_since(): Take an arbitrary branch as input

Allow the branch to be parameterised instead of forcing the base to be
the local "master" branch.

Added the `Todos` struct to store a `Repository` reference, since we
need this for both the base ref and the diff.

Decided to take a `Tree` instead of a `Branch` because we might want to
compare against an arbitrary ref and allow users to specify that ref on
the command line.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/main.rs b/src/main.rs
index 60f12d8..48e8f5d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,8 +1,13 @@
 #![warn(rust_2018_idioms)]
 
-use git_todo::write_since;
+use git2::Repository;
+
+use git_todo::Todos;
 
 
 fn main() {
-    write_since(&mut std::io::stdout());
+    let repo = Repository::open(".").unwrap();
+
+    let todos = Todos { repo: &repo };
+    todos.write_since(todos.master_tree(), &mut std::io::stdout());
 }