thodg/libgit2

diff --git a/examples/status.c b/examples/status.c
index 6890984..0d9f55f 100644
--- a/examples/status.c
+++ b/examples/status.c
@@ -71,7 +71,7 @@ static void show_branch(git_repository *repo, int format)
 
 	error = git_repository_head(&head, repo);
 
-	if (error == GIT_EORPHANEDHEAD || error == GIT_ENOTFOUND)
+	if (error == GIT_EUNBORNBRANCH || error == GIT_ENOTFOUND)
 		branch = NULL;
 	else if (!error) {
 		branch = git_reference_name(head);
diff --git a/include/git2/checkout.h b/include/git2/checkout.h
index a086408..aa48069 100644
--- a/include/git2/checkout.h
+++ b/include/git2/checkout.h
@@ -249,7 +249,7 @@ typedef struct git_checkout_opts {
  *
  * @param repo repository to check out (must be non-bare)
  * @param opts specifies checkout options (may be NULL)
- * @return 0 on success, GIT_EORPHANEDHEAD when HEAD points to a non existing
+ * @return 0 on success, GIT_EUNBORNBRANCH when HEAD points to a non existing
  * branch, GIT_ERROR otherwise (use giterr_last for information
  * about the error)
  */
diff --git a/include/git2/errors.h b/include/git2/errors.h
index 0f0bddf..dd56644 100644
--- a/include/git2/errors.h
+++ b/include/git2/errors.h
@@ -27,7 +27,7 @@ typedef enum {
 	GIT_EBUFS = -6,
 	GIT_EUSER = -7,
 	GIT_EBAREREPO = -8,
-	GIT_EORPHANEDHEAD = -9,
+	GIT_EUNBORNBRANCH = -9,
 	GIT_EUNMERGED = -10,
 	GIT_ENONFASTFORWARD = -11,
 	GIT_EINVALIDSPEC = -12,
diff --git a/include/git2/repository.h b/include/git2/repository.h
index 807d834..b4d5619 100644
--- a/include/git2/repository.h
+++ b/include/git2/repository.h
@@ -297,7 +297,7 @@ GIT_EXTERN(int) git_repository_init_ext(
  * @param out pointer to the reference which will be retrieved
  * @param repo a repository object
  *
- * @return 0 on success, GIT_EORPHANEDHEAD when HEAD points to a non existing
+ * @return 0 on success, GIT_EUNBORNBRANCH when HEAD points to a non existing
  * branch, GIT_ENOTFOUND when HEAD is missing; an error code otherwise
  */
 GIT_EXTERN(int) git_repository_head(git_reference **out, git_repository *repo);
@@ -315,16 +315,16 @@ GIT_EXTERN(int) git_repository_head(git_reference **out, git_repository *repo);
 GIT_EXTERN(int) git_repository_head_detached(git_repository *repo);
 
 /**
- * Check if the current branch is an orphan
+ * Check if the current branch is unborn
  *
- * An orphan branch is one named from HEAD but which doesn't exist in
+ * An unborn branch is one named from HEAD but which doesn't exist in
  * the refs namespace, because it doesn't have any commit to point to.
  *
  * @param repo Repo to test
- * @return 1 if the current branch is an orphan, 0 if it's not; error
+ * @return 1 if the current branch is unborn, 0 if it's not; error
  * code if there was an error
  */
-GIT_EXTERN(int) git_repository_head_orphan(git_repository *repo);
+GIT_EXTERN(int) git_repository_head_unborn(git_repository *repo);
 
 /**
  * Check if a repository is empty
@@ -611,7 +611,7 @@ GIT_EXTERN(int) git_repository_set_head_detached(
  * Otherwise, the HEAD will be detached and point to the peeled Commit.
  *
  * @param repo Repository pointer
- * @return 0 on success, GIT_EORPHANEDHEAD when HEAD points to a non existing
+ * @return 0 on success, GIT_EUNBORNBRANCH when HEAD points to a non existing
  * branch or an error code
  */
 GIT_EXTERN(int) git_repository_detach_head(
diff --git a/src/branch.c b/src/branch.c
index 7064fa7..3a745c1 100644
--- a/src/branch.c
+++ b/src/branch.c
@@ -585,7 +585,7 @@ int git_branch_is_head(
 
 	error = git_repository_head(&head, git_reference_owner(branch));
 
-	if (error == GIT_EORPHANEDHEAD || error == GIT_ENOTFOUND)
+	if (error == GIT_EUNBORNBRANCH || error == GIT_ENOTFOUND)
 		return false;
 
 	if (error < 0)
diff --git a/src/checkout.c b/src/checkout.c
index aae354c..eb92e8f 100644
--- a/src/checkout.c
+++ b/src/checkout.c
@@ -1232,7 +1232,7 @@ static int checkout_data_init(
 
 		error = checkout_lookup_head_tree(&data->opts.baseline, repo);
 
-		if (error == GIT_EORPHANEDHEAD) {
+		if (error == GIT_EUNBORNBRANCH) {
 			error = 0;
 			giterr_clear();
 		}
diff --git a/src/clone.c b/src/clone.c
index 9f47e07..ff251be 100644
--- a/src/clone.c
+++ b/src/clone.c
@@ -415,7 +415,7 @@ static bool should_checkout(
 	if (opts->checkout_strategy == GIT_CHECKOUT_NONE)
 		return false;
 
-	return !git_repository_head_orphan(repo);
+	return !git_repository_head_unborn(repo);
 }
 
 static void normalize_options(git_clone_options *dst, const git_clone_options *src, git_repository_init_options *initOptions)
diff --git a/src/remote.c b/src/remote.c
index bdc8e0e..bfcb3eb 100644
--- a/src/remote.c
+++ b/src/remote.c
@@ -806,7 +806,7 @@ static int remote_head_for_ref(git_remote_head **out, git_refspec *spec, git_vec
 		(!git_reference_is_branch(resolved_ref)) ||
 		(error = git_branch_upstream(&tracking_ref, resolved_ref)) < 0 ||
 		(error = git_refspec_transform_l(&remote_name, spec, git_reference_name(tracking_ref))) < 0) {
-		/* Not an error if HEAD is orphaned or no tracking branch */
+		/* Not an error if HEAD is unborn or no tracking branch */
 		if (error == GIT_ENOTFOUND)
 			error = 0;
 
diff --git a/src/repository.c b/src/repository.c
index eae22ce..eead412 100644
--- a/src/repository.c
+++ b/src/repository.c
@@ -1451,10 +1451,10 @@ int git_repository_head(git_reference **head_out, git_repository *repo)
 	error = git_reference_lookup_resolved(head_out, repo, git_reference_symbolic_target(head), -1);
 	git_reference_free(head);
 
-	return error == GIT_ENOTFOUND ? GIT_EORPHANEDHEAD : error;
+	return error == GIT_ENOTFOUND ? GIT_EUNBORNBRANCH : error;
 }
 
-int git_repository_head_orphan(git_repository *repo)
+int git_repository_head_unborn(git_repository *repo)
 {
 	git_reference *ref = NULL;
 	int error;
@@ -1462,7 +1462,7 @@ int git_repository_head_orphan(git_repository *repo)
 	error = git_repository_head(&ref, repo);
 	git_reference_free(ref);
 
-	if (error == GIT_EORPHANEDHEAD)
+	if (error == GIT_EUNBORNBRANCH)
 		return 1;
 
 	if (error < 0)
diff --git a/src/stash.c b/src/stash.c
index 48f1914..ab4a685 100644
--- a/src/stash.c
+++ b/src/stash.c
@@ -27,7 +27,7 @@ static int retrieve_head(git_reference **out, git_repository *repo)
 {
 	int error = git_repository_head(out, repo);
 
-	if (error == GIT_EORPHANEDHEAD)
+	if (error == GIT_EUNBORNBRANCH)
 		return create_error(error, "You do not have the initial commit yet.");
 
 	return error;
diff --git a/src/status.c b/src/status.c
index 4a0d650..be40b9f 100644
--- a/src/status.c
+++ b/src/status.c
@@ -252,7 +252,7 @@ int git_status_list_new(
 
 	/* if there is no HEAD, that's okay - we'll make an empty iterator */
 	if (((error = git_repository_head_tree(&head, repo)) < 0) &&
-		error != GIT_ENOTFOUND && error != GIT_EORPHANEDHEAD) {
+		error != GIT_ENOTFOUND && error != GIT_EUNBORNBRANCH) {
 		git_index_free(index); /* release index */
 		return error;
 	}
diff --git a/src/submodule.c b/src/submodule.c
index 40bda9a..121383b 100644
--- a/src/submodule.c
+++ b/src/submodule.c
@@ -1557,7 +1557,7 @@ static void submodule_get_wd_status(
 	if (ign == GIT_SUBMODULE_IGNORE_NONE)
 		opt.flags |= GIT_DIFF_INCLUDE_UNTRACKED;
 
-	/* if we don't have an orphaned head, check diff with index */
+	/* if we don't have an unborn head, check diff with index */
 	if (git_repository_head_tree(&sm_head, sm_repo) < 0)
 		giterr_clear();
 	else {
diff --git a/tests-clar/checkout/head.c b/tests-clar/checkout/head.c
index 46646f8..74c6fb8 100644
--- a/tests-clar/checkout/head.c
+++ b/tests-clar/checkout/head.c
@@ -16,11 +16,11 @@ void test_checkout_head__cleanup(void)
 	cl_git_sandbox_cleanup();
 }
 
-void test_checkout_head__orphaned_head_returns_GIT_EORPHANEDHEAD(void)
+void test_checkout_head__unborn_head_returns_GIT_EUNBORNBRANCH(void)
 {
-	make_head_orphaned(g_repo, NON_EXISTING_HEAD);
+	make_head_unborn(g_repo, NON_EXISTING_HEAD);
 
-	cl_assert_equal_i(GIT_EORPHANEDHEAD, git_checkout_head(g_repo, NULL));
+	cl_assert_equal_i(GIT_EUNBORNBRANCH, git_checkout_head(g_repo, NULL));
 }
 
 void test_checkout_head__with_index_only_tree(void)
diff --git a/tests-clar/clone/empty.c b/tests-clar/clone/empty.c
index f92fa6c..d9dc24f 100644
--- a/tests-clar/clone/empty.c
+++ b/tests-clar/clone/empty.c
@@ -44,7 +44,7 @@ void test_clone_empty__can_clone_an_empty_local_repo_barely(void)
 	g_options.bare = true;
 	cl_git_pass(git_clone(&g_repo_cloned, "./empty_bare.git", "./empty", &g_options));
 
-	/* Although the HEAD is orphaned... */
+	/* Although the HEAD is unborn... */
 	cl_assert_equal_i(GIT_ENOTFOUND, git_reference_lookup(&ref, g_repo_cloned, local_name));
 
 	/* ...one can still retrieve the name of the remote tracking reference */
@@ -59,7 +59,7 @@ void test_clone_empty__can_clone_an_empty_local_repo_barely(void)
 
 	cl_assert_equal_s(expected_remote_name, buffer);
 
-	/* ...even when the remote HEAD is orphaned as well */
+	/* ...even when the remote HEAD is unborn as well */
 	cl_assert_equal_i(GIT_ENOTFOUND, git_reference_lookup(&ref, g_repo_cloned,
 		expected_tracked_branch_name));
 }
diff --git a/tests-clar/clone/nonetwork.c b/tests-clar/clone/nonetwork.c
index 339b1e7..5b9faa6 100644
--- a/tests-clar/clone/nonetwork.c
+++ b/tests-clar/clone/nonetwork.c
@@ -228,7 +228,7 @@ void test_clone_nonetwork__can_checkout_given_branch(void)
 	g_options.checkout_branch = "test";
 	cl_git_pass(git_clone(&g_repo, cl_git_fixture_url("testrepo.git"), "./foo", &g_options));
 
-	cl_assert_equal_i(0, git_repository_head_orphan(g_repo));
+	cl_assert_equal_i(0, git_repository_head_unborn(g_repo));
 
 	cl_git_pass(git_repository_head(&g_ref, g_repo));
 	cl_assert_equal_s(git_reference_name(g_ref), "refs/heads/test");
diff --git a/tests-clar/online/clone.c b/tests-clar/online/clone.c
index bc4285a..dc5aa41 100644
--- a/tests-clar/online/clone.c
+++ b/tests-clar/online/clone.c
@@ -69,7 +69,7 @@ void test_online_clone__empty_repository(void)
 	cl_git_pass(git_clone(&g_repo, LIVE_EMPTYREPO_URL, "./foo", &g_options));
 
 	cl_assert_equal_i(true, git_repository_is_empty(g_repo));
-	cl_assert_equal_i(true, git_repository_head_orphan(g_repo));
+	cl_assert_equal_i(true, git_repository_head_unborn(g_repo));
 
 	cl_git_pass(git_reference_lookup(&head, g_repo, GIT_HEAD_FILE));
 	cl_assert_equal_i(GIT_REF_SYMBOLIC, git_reference_type(head));
diff --git a/tests-clar/refs/branches/delete.c b/tests-clar/refs/branches/delete.c
index 7af5a3e..de90cb7 100644
--- a/tests-clar/refs/branches/delete.c
+++ b/tests-clar/refs/branches/delete.c
@@ -57,11 +57,11 @@ void test_refs_branches_delete__can_delete_a_branch_even_if_HEAD_is_missing(void
 	git_reference_free(branch);
 }
 
-void test_refs_branches_delete__can_delete_a_branch_when_HEAD_is_orphaned(void)
+void test_refs_branches_delete__can_delete_a_branch_when_HEAD_is_unborn(void)
 {
 	git_reference *branch;
 
-	make_head_orphaned(repo, NON_EXISTING_HEAD);
+	make_head_unborn(repo, NON_EXISTING_HEAD);
 
 	cl_git_pass(git_branch_lookup(&branch, repo, "br2", GIT_BRANCH_LOCAL));
 	cl_git_pass(git_branch_delete(branch));
diff --git a/tests-clar/refs/branches/ishead.c b/tests-clar/refs/branches/ishead.c
index dfcf1b5..b1ad09c 100644
--- a/tests-clar/refs/branches/ishead.c
+++ b/tests-clar/refs/branches/ishead.c
@@ -26,13 +26,13 @@ void test_refs_branches_ishead__can_tell_if_a_branch_is_pointed_at_by_HEAD(void)
 	cl_assert_equal_i(true, git_branch_is_head(branch));
 }
 
-void test_refs_branches_ishead__can_properly_handle_orphaned_HEAD(void)
+void test_refs_branches_ishead__can_properly_handle_unborn_HEAD(void)
 {
 	git_repository_free(repo);
 
 	repo = cl_git_sandbox_init("testrepo.git");
 
-	make_head_orphaned(repo, NON_EXISTING_HEAD);
+	make_head_unborn(repo, NON_EXISTING_HEAD);
 
 	cl_git_pass(git_reference_lookup(&branch, repo, "refs/heads/master"));
 
diff --git a/tests-clar/repo/head.c b/tests-clar/repo/head.c
index a9f5cfc..5a55984 100644
--- a/tests-clar/repo/head.c
+++ b/tests-clar/repo/head.c
@@ -32,20 +32,20 @@ void test_repo_head__head_detached(void)
 	cl_assert_equal_i(false, git_repository_head_detached(repo));
 }
 
-void test_repo_head__head_orphan(void)
+void test_repo_head__unborn_head(void)
 {
 	git_reference *ref;
 
 	cl_git_pass(git_repository_head_detached(repo));
 
-	make_head_orphaned(repo, NON_EXISTING_HEAD);
+	make_head_unborn(repo, NON_EXISTING_HEAD);
 
-	cl_assert(git_repository_head_orphan(repo) == 1);
+	cl_assert(git_repository_head_unborn(repo) == 1);
 
 
 	/* take the repo back to it's original state */
 	cl_git_pass(git_reference_symbolic_create(&ref, repo, "HEAD", "refs/heads/master", 1));
-	cl_assert(git_repository_head_orphan(repo) == 0);
+	cl_assert(git_repository_head_unborn(repo) == 0);
 
 	git_reference_free(ref);
 }
@@ -58,7 +58,7 @@ void test_repo_head__set_head_Attaches_HEAD_to_un_unborn_branch_when_the_branch_
 
 	cl_assert_equal_i(false, git_repository_head_detached(repo));
 
-	cl_assert_equal_i(GIT_EORPHANEDHEAD, git_repository_head(&head, repo));
+	cl_assert_equal_i(GIT_EUNBORNBRANCH, git_repository_head(&head, repo));
 }
 
 void test_repo_head__set_head_Returns_ENOTFOUND_when_the_reference_doesnt_exist(void)
@@ -163,20 +163,20 @@ void test_repo_head__detach_head_Fails_if_HEAD_and_point_to_a_non_commitish(void
 	git_reference_free(head);
 }
 
-void test_repo_head__detaching_an_orphaned_head_returns_GIT_EORPHANEDHEAD(void)
+void test_repo_head__detaching_an_unborn_branch_returns_GIT_EUNBORNBRANCH(void)
 {
-	make_head_orphaned(repo, NON_EXISTING_HEAD);
+	make_head_unborn(repo, NON_EXISTING_HEAD);
 
-	cl_assert_equal_i(GIT_EORPHANEDHEAD, git_repository_detach_head(repo));
+	cl_assert_equal_i(GIT_EUNBORNBRANCH, git_repository_detach_head(repo));
 }
 
-void test_repo_head__retrieving_an_orphaned_head_returns_GIT_EORPHANEDHEAD(void)
+void test_repo_head__retrieving_an_unborn_branch_returns_GIT_EUNBORNBRANCH(void)
 {
 	git_reference *head;
 
-	make_head_orphaned(repo, NON_EXISTING_HEAD);
+	make_head_unborn(repo, NON_EXISTING_HEAD);
 
-	cl_assert_equal_i(GIT_EORPHANEDHEAD, git_repository_head(&head, repo));
+	cl_assert_equal_i(GIT_EUNBORNBRANCH, git_repository_head(&head, repo));
 }
 
 void test_repo_head__retrieving_a_missing_head_returns_GIT_ENOTFOUND(void)
@@ -188,9 +188,9 @@ void test_repo_head__retrieving_a_missing_head_returns_GIT_ENOTFOUND(void)
 	cl_assert_equal_i(GIT_ENOTFOUND, git_repository_head(&head, repo));
 }
 
-void test_repo_head__can_tell_if_an_orphaned_head_is_detached(void)
+void test_repo_head__can_tell_if_an_unborn_head_is_detached(void)
 {
-	make_head_orphaned(repo, NON_EXISTING_HEAD);
+	make_head_unborn(repo, NON_EXISTING_HEAD);
 
 	cl_assert_equal_i(false, git_repository_head_detached(repo));
 }
diff --git a/tests-clar/repo/headtree.c b/tests-clar/repo/headtree.c
index 0e7fe93..e899ac3 100644
--- a/tests-clar/repo/headtree.c
+++ b/tests-clar/repo/headtree.c
@@ -36,13 +36,13 @@ void test_repo_headtree__can_retrieve_the_root_tree_from_a_non_detached_head(voi
 	cl_assert(git_oid_streq(git_tree_id(tree), "az"));
 }
 
-void test_repo_headtree__when_head_is_orphaned_returns_EORPHANEDHEAD(void)
+void test_repo_headtree__when_head_is_unborn_returns_EUNBORNBRANCH(void)
 {
-	make_head_orphaned(repo, NON_EXISTING_HEAD);
+	make_head_unborn(repo, NON_EXISTING_HEAD);
 
-	cl_assert_equal_i(true, git_repository_head_orphan(repo));
+	cl_assert_equal_i(true, git_repository_head_unborn(repo));
 
-	cl_assert_equal_i(GIT_EORPHANEDHEAD, git_repository_head_tree(&tree, repo));
+	cl_assert_equal_i(GIT_EUNBORNBRANCH, git_repository_head_tree(&tree, repo));
 }
 
 void test_repo_headtree__when_head_is_missing_returns_ENOTFOUND(void)
diff --git a/tests-clar/repo/repo_helpers.c b/tests-clar/repo/repo_helpers.c
index 74902e4..3d477ff 100644
--- a/tests-clar/repo/repo_helpers.c
+++ b/tests-clar/repo/repo_helpers.c
@@ -3,7 +3,7 @@
 #include "repo_helpers.h"
 #include "posix.h"
 
-void make_head_orphaned(git_repository* repo, const char *target)
+void make_head_unborn(git_repository* repo, const char *target)
 {
 	git_reference *head;
 
diff --git a/tests-clar/repo/repo_helpers.h b/tests-clar/repo/repo_helpers.h
index 09b5cac..6783d57 100644
--- a/tests-clar/repo/repo_helpers.h
+++ b/tests-clar/repo/repo_helpers.h
@@ -2,5 +2,5 @@
 
 #define NON_EXISTING_HEAD "refs/heads/hide/and/seek"
 
-extern void make_head_orphaned(git_repository* repo, const char *target);
+extern void make_head_unborn(git_repository* repo, const char *target);
 extern void delete_head(git_repository* repo);
diff --git a/tests-clar/reset/soft.c b/tests-clar/reset/soft.c
index 884697c..bd6fcc2 100644
--- a/tests-clar/reset/soft.c
+++ b/tests-clar/reset/soft.c
@@ -95,19 +95,19 @@ void test_reset_soft__cannot_reset_to_a_tag_not_pointing_at_a_commit(void)
 	cl_git_fail(git_reset(repo, target, GIT_RESET_SOFT));
 }
 
-void test_reset_soft__resetting_against_an_orphaned_head_repo_makes_the_head_no_longer_orphaned(void)
+void test_reset_soft__resetting_against_an_unborn_head_repo_makes_the_head_no_longer_unborn(void)
 {
 	git_reference *head;
 
 	retrieve_target_from_oid(&target, repo, KNOWN_COMMIT_IN_BARE_REPO);
 
-	make_head_orphaned(repo, NON_EXISTING_HEAD);
+	make_head_unborn(repo, NON_EXISTING_HEAD);
 
-	cl_assert_equal_i(true, git_repository_head_orphan(repo));
+	cl_assert_equal_i(true, git_repository_head_unborn(repo));
 
 	cl_git_pass(git_reset(repo, target, GIT_RESET_SOFT));
 
-	cl_assert_equal_i(false, git_repository_head_orphan(repo));
+	cl_assert_equal_i(false, git_repository_head_unborn(repo));
 
 	cl_git_pass(git_reference_lookup(&head, repo, NON_EXISTING_HEAD));
 	cl_assert_equal_i(0, git_oid_streq(git_reference_target(head), KNOWN_COMMIT_IN_BARE_REPO));
diff --git a/tests-clar/stash/save.c b/tests-clar/stash/save.c
index eae116a..bb35a3d 100644
--- a/tests-clar/stash/save.c
+++ b/tests-clar/stash/save.c
@@ -194,7 +194,7 @@ void test_stash_save__cannot_stash_against_an_unborn_branch(void)
 
 	cl_git_pass(git_reference_symbolic_create(&head, repo, "HEAD", "refs/heads/unborn", 1));
 
-	cl_assert_equal_i(GIT_EORPHANEDHEAD,
+	cl_assert_equal_i(GIT_EUNBORNBRANCH,
 		git_stash_save(&stash_tip_oid, repo, signature, NULL, GIT_STASH_DEFAULT));
 
 	git_reference_free(head);
diff --git a/tests-clar/submodule/lookup.c b/tests-clar/submodule/lookup.c
index 013bbdf..b626cdf 100644
--- a/tests-clar/submodule/lookup.c
+++ b/tests-clar/submodule/lookup.c
@@ -114,15 +114,15 @@ void test_submodule_lookup__foreach(void)
 	cl_assert_equal_i(8, data.count);
 }
 
-void test_submodule_lookup__lookup_even_with_orphaned_head(void)
+void test_submodule_lookup__lookup_even_with_unborn_head(void)
 {
-	git_reference *orphan;
+	git_reference *head;
 	git_submodule *sm;
 
-	/* orphan the head */
+	/* put us on an unborn branch */
 	cl_git_pass(git_reference_symbolic_create(
-		&orphan, g_repo, "HEAD", "refs/heads/garbage", 1));
-	git_reference_free(orphan);
+		&head, g_repo, "HEAD", "refs/heads/garbage", 1));
+	git_reference_free(head);
 
 	/* lookup existing */
 	cl_git_pass(git_submodule_lookup(&sm, g_repo, "sm_unchanged"));