use rev_parse_single() instead of rev_parse().single()

Author: Sidney Douw

git-repository/tests/reference/mod.rs

@@ -70,7 +70,7 @@ mod find {
 fn set_target_id() {
     let (repo, _tmp) = repo_rw("make_basic_repo.sh").unwrap();
     let mut head_ref = repo.head_ref().unwrap().expect("present");
-    let target_id = repo.rev_parse(":/c1").unwrap().single().unwrap();
+    let target_id = repo.rev_parse_single(":/c1").unwrap();
     let prev_id = head_ref.id();
     assert_ne!(prev_id, target_id, "we don't point to the target id yet");
     head_ref.set_target_id(target_id, "reflog message").unwrap();

gitoxide-core/src/repository/commit.rs

@@ -18,12 +18,7 @@ pub fn describe(
 ) -> Result<()> {
     repo.object_cache_size_if_unset(4 * 1024 * 1024);
     let commit = match rev_spec {
-        Some(spec) => repo
-            .rev_parse(spec)?
-            .single()
-            .context("Need single revision revspec")?
-            .object()?
-            .try_into_commit()?,
+        Some(spec) => repo.rev_parse_single(spec)?.object()?.try_into_commit()?,
         None => repo.head_commit()?,
     };
     use git::commit::describe::SelectRef::*;

gitoxide-core/src/repository/revision/list.rs

@@ -18,8 +18,7 @@ pub fn list(
 
     let spec = git::path::os_str_into_bstr(&spec)?;
     let id = repo
-        .rev_parse(spec)?
-        .single()
+        .rev_parse_single(spec)
         .context("Only single revisions are currently supported")?;
     let commit_id = id
         .object()?