[PATCH v9 0/4] worktree: teach "add" to check out existing branches

[Thomas Gummerer <t.gummerer@gmail.com>]

Previous rounds are at <20180121120208.12760-1-t.gummerer@gmail.com>,
<20180204221305.28300-1-t.gummerer@gmail.com>,
<20180317220830.30963-1-t.gummerer@gmail.com>,
<20180317222219.4940-1-t.gummerer@gmail.com>,
<20180325134947.25828-1-t.gummerer@gmail.com>,
<20180331151804.30380-1-t.gummerer@gmail.com>,
<20180415202917.4360-1-t.gummerer@gmail.com> and
<20180423193848.5159-1-t.gummerer@gmail.com>.

Thanks Eric for the review and the suggestions on the previous round.

Changes since the previous round:

- UNLEAK new_branch after it was xstrndup'd
- update the commit message of 2/4 according to Eric's suggestions
- make force_new_branch a boolean flag in
  print_preparing_worktree_line, instead of using it as the branch
  name.  Instead use new_branch as the new branch name everywhere in
  that function.
- get rid of the ckeckout_existing_branch flag

Interdiff below:

diff --git a/builtin/worktree.c b/builtin/worktree.c
index d52495f312..d3aeb4877d 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -356,18 +356,15 @@ static int add_worktree(const char *path, const char *refname,
 static void print_preparing_worktree_line(int detach,
 					  const char *branch,
 					  const char *new_branch,
-					  const char *new_branch_force,
-					  int checkout_existing_branch)
+					  int force_new_branch)
 {
-	if (checkout_existing_branch) {
-		printf_ln(_("Preparing worktree (checking out '%s')"), branch);
-	} else if (new_branch_force) {
-		struct commit *commit = lookup_commit_reference_by_name(new_branch_force);
+	if (force_new_branch) {
+		struct commit *commit = lookup_commit_reference_by_name(new_branch);
 		if (!commit)
-			printf_ln(_("Preparing worktree (new branch '%s')"), new_branch_force);
+			printf_ln(_("Preparing worktree (new branch '%s')"), new_branch);
 		else
 			printf_ln(_("Preparing worktree (resetting branch '%s'; was at %s)"),
-				  new_branch_force,
+				  new_branch,
 				  find_unique_abbrev(commit->object.oid.hash,
 						     DEFAULT_ABBREV));
 	} else if (new_branch) {
@@ -390,19 +387,17 @@ static void print_preparing_worktree_line(int detach,
 	}
 }
 
-static const char *dwim_branch(const char *path, const char **new_branch,
-			       int *checkout_existing_branch)
+static const char *dwim_branch(const char *path, const char **new_branch)
 {
 	int n;
 	const char *s = worktree_basename(path, &n);
 	const char *branchname = xstrndup(s, n);
 	struct strbuf ref = STRBUF_INIT;
 
+	UNLEAK(branchname);
 	if (!strbuf_check_branch_ref(&ref, branchname) &&
 	    ref_exists(ref.buf)) {
-		*checkout_existing_branch = 1;
 		strbuf_release(&ref);
-		UNLEAK(branchname);
 		return branchname;
 	}
 
@@ -421,7 +416,6 @@ static int add(int ac, const char **av, const char *prefix)
 	struct add_opts opts;
 	const char *new_branch_force = NULL;
 	char *path;
-	int checkout_existing_branch = 0;
 	const char *branch;
 	const char *new_branch = NULL;
 	const char *opt_track = NULL;
@@ -469,8 +463,7 @@ static int add(int ac, const char **av, const char *prefix)
 	}
 
 	if (ac < 2 && !new_branch && !opts.detach) {
-		const char *s = dwim_branch(path, &new_branch,
-					    &checkout_existing_branch);
+		const char *s = dwim_branch(path, &new_branch);
 		if (s)
 			branch = s;
 	}
@@ -490,8 +483,7 @@ static int add(int ac, const char **av, const char *prefix)
 		}
 	}
 
-	print_preparing_worktree_line(opts.detach, branch, new_branch, new_branch_force,
-				      checkout_existing_branch);
+	print_preparing_worktree_line(opts.detach, branch, new_branch, !!new_branch_force);
 
 	if (new_branch) {
 		struct child_process cp = CHILD_PROCESS_INIT;

Thomas Gummerer (4):
  worktree: remove extra members from struct add_opts
  worktree: improve message when creating a new worktree
  worktree: factor out dwim_branch function
  worktree: teach "add" to check out existing branches

 Documentation/git-worktree.txt |   9 +++-
 builtin/worktree.c             | 103 ++++++++++++++++++++++++++++++-----------
 t/t2025-worktree-add.sh        |  26 ++++++++---
 3 files changed, 102 insertions(+), 36 deletions(-)

-- 
2.16.1.74.g7afd1c25cc.dirty