step fifty seven: retrieve remote refs in a separate function

src/remote.rs

@@ -1,11 +1,21 @@
+use std::collections::HashMap;
+
 #[path = "data.rs"]
 mod data;
 
 pub fn fetch(path: String) {
     println!("Will fetch the following refs:");
+    for (refname, _) in get_remote_refs(path, "refs/heads").iter() {
+        println!("- {}", refname);
+    }
+}
+
+fn get_remote_refs(path: String, prefix: &str) -> HashMap<String, String> {
+    let mut refs = HashMap::new();
     data::set_rgit_dir(path.as_str());
-    for (refname, _) in data::iter_refs("refs/heads", true) {
-        println!(" - {}", refname);
+    for (refname, reference) in data::iter_refs(prefix, true) {
+        refs.insert(refname, reference.value);
     }
     data::reset_rgit_dir();
+    return refs;
 }