first basic printing of result when no change was found (#450)

This just prints the ref-map, which will be determined to have no change
at all.

gitoxide-core/src/repository/fetch.rs

@@ -19,6 +19,7 @@ pub(crate) mod function {
     use crate::OutputFormat;
     use anyhow::bail;
     use git_repository as git;
+    use git_repository::remote::fetch::Status;
 
     pub fn fetch(
         repo: git::Repository,
@@ -43,6 +44,15 @@ pub(crate) mod function {
             .with_dry_run(dry_run)
             .receive(&git::interrupt::IS_INTERRUPTED)?;
 
-        Ok(())
+        match res.status {
+            Status::NoChange => crate::repository::remote::refs::print_refmap(
+                &repo,
+                remote.refspecs(git::remote::Direction::Fetch),
+                res.ref_map,
+                out,
+                err,
+            ),
+            Status::Change { update_refs, .. } | Status::DryRun { update_refs } => todo!("change printing or dry-run"),
+        }
     }
 }

gitoxide-core/src/repository/remote.rs

@@ -27,7 +27,7 @@ mod refs_impl {
             pub handshake_info: bool,
         }
 
-        pub(crate) use super::print;
+        pub(crate) use super::{print, print_refmap};
     }
 
     #[git::protocol::maybe_async::maybe_async]
@@ -91,7 +91,7 @@ mod refs_impl {
         }
     }
 
-    fn print_refmap(
+    pub(crate) fn print_refmap(
         repo: &git::Repository,
         refspecs: &[RefSpec],
         mut map: git::remote::fetch::RefMap<'_>,