From: Duy Nguyen <pclouds@gmail.com>
To: Thomas Gummerer <t.gummerer@gmail.com>
Cc: Git Mailing List <git@vger.kernel.org>,
Eric Sunshine <sunshine@sunshineco.com>
Subject: Re: [PATCH] worktree: teach "add" to check out existing branches
Date: Mon, 22 Jan 2018 18:18:57 +0700 [thread overview]
Message-ID: <CACsJy8D9LS7e=cVE3Fq2qOnxK5++nFg2vjuhkNtRO-Bx0X1j6w@mail.gmail.com> (raw)
In-Reply-To: <20180121120208.12760-1-t.gummerer@gmail.com>
On Sun, Jan 21, 2018 at 7:02 PM, Thomas Gummerer <t.gummerer@gmail.com> wrote:
> Currently 'git worktree add <path>' creates a new branch named after the
> basename of the path by default. If a branch with that name already
> exists, the command refuses to do anything, unless the '--force' option
> is given.
>
> However we can do a little better than that, and check the branch out if
> it is not checked out anywhere else. This will help users who just want
> to check an existing branch out into a new worktree, and save a few
> keystrokes.
>
> As the current behaviour is to simply 'die()' when a brach with the name
> of the basename of the path already exists, there are no backwards
> compatibility worries here.
>
> We will still 'die()' if the branch is checked out in another worktree,
> unless the --force flag is passed.
>
> Signed-off-by: Thomas Gummerer <t.gummerer@gmail.com>
> ---
>
> This is a follow-up to
> https://public-inbox.org/git/20171118181345.GC32324@hank/, where this
> was first suggested, but I didn't want to do it as part of that
> series. Now I finally got around to implementing it.
>
> Documentation/git-worktree.txt | 9 +++++++--
> builtin/worktree.c | 22 +++++++++++++++-------
> t/t2025-worktree-add.sh | 15 ++++++++++++---
> 3 files changed, 34 insertions(+), 12 deletions(-)
>
> diff --git a/Documentation/git-worktree.txt b/Documentation/git-worktree.txt
> index 41585f535d..98731b71a7 100644
> --- a/Documentation/git-worktree.txt
> +++ b/Documentation/git-worktree.txt
> @@ -61,8 +61,13 @@ $ git worktree add --track -b <branch> <path> <remote>/<branch>
> ------------
> +
> If `<commit-ish>` is omitted and neither `-b` nor `-B` nor `--detach` used,
> -then, as a convenience, a new branch based at HEAD is created automatically,
> -as if `-b $(basename <path>)` was specified.
> +then, as a convenience, a worktree with a branch named after
> +`$(basename <path>)` (call it `<branch>`) is created. If `<branch>`
> +doesn't exist, a new branch based on HEAD is automatically created as
> +if `-b <branch>` was given. If `<branch>` exists in the repository,
> +it will be checked out in the new worktree, if it's not checked out
> +anywhere else, otherwise the command will refuse to create the
> +worktree.
It starts getting a bit too magical to me. We probably should print
something "switching to branch..." or "creating new branch ..." to
let people know what decision was taken, unless --quiet is given. Yeah
I know --quiet does not exist. You don't need to add it now either
since nobody has asked for it.
More or less related to this, there was a question [1] whether we
could do better than $(basename <path>) for determining branch name.
Since you're doing start to check if a branch exists, people may start
asking to check for branch "foo/bar" from the path abc/foo/bar instead
of just branch "bar".
[1] https://github.com/git-for-windows/git/issues/1390
>
> list::
>
> diff --git a/builtin/worktree.c b/builtin/worktree.c
> index 7cef5b120b..148a864bb9 100644
> --- a/builtin/worktree.c
> +++ b/builtin/worktree.c
> @@ -411,13 +411,21 @@ static int add(int ac, const char **av, const char *prefix)
> if (ac < 2 && !opts.new_branch && !opts.detach) {
> int n;
> const char *s = worktree_basename(path, &n);
> - opts.new_branch = xstrndup(s, n);
> - if (guess_remote) {
> - struct object_id oid;
> - const char *remote =
> - unique_tracking_name(opts.new_branch, &oid);
> - if (remote)
> - branch = remote;
> + const char *branchname = xstrndup(s, n);
> + struct strbuf ref = STRBUF_INIT;
Perhaps a blank line after this to separate var declarations and the rest.
> + if (!strbuf_check_branch_ref(&ref, branchname) &&
> + ref_exists(ref.buf)) {
> + branch = branchname;
Hmm.. do we need UNLEAK(branch);? Maybe you should try valgrind, I'm not sure.
> + opts.checkout = 1;
> + } else {
> + opts.new_branch = branchname;
> + if (guess_remote) {
> + struct object_id oid;
> + const char *remote =
> + unique_tracking_name(opts.new_branch, &oid);
> + if (remote)
> + branch = remote;
> + }
> }
> }
>
> diff --git a/t/t2025-worktree-add.sh b/t/t2025-worktree-add.sh
> index 2b95944973..721b0e4c26 100755
> --- a/t/t2025-worktree-add.sh
> +++ b/t/t2025-worktree-add.sh
> @@ -198,13 +198,22 @@ test_expect_success '"add" with <branch> omitted' '
> test_cmp_rev HEAD bat
> '
>
> -test_expect_success '"add" auto-vivify does not clobber existing branch' '
> +test_expect_success '"add" auto-vivify checks out existing branch' '
> test_commit c1 &&
> test_commit c2 &&
> git branch precious HEAD~1 &&
> - test_must_fail git worktree add precious &&
> + git worktree add precious &&
> test_cmp_rev HEAD~1 precious &&
> - test_path_is_missing precious
> + (
> + cd precious &&
> + test_cmp_rev precious HEAD
> + )
> +'
> +
> +test_expect_success '"add" auto-vivify fails with checked out branch' '
> + git checkout -b test-branch &&
> + test_must_fail git worktree add test-branch &&
> + test_path_is_missing test-branch
> '
>
> test_expect_success '"add" no auto-vivify with --detach and <branch> omitted' '
> --
> 2.16.0.312.g896df04e46
>
--
Duy
next prev parent reply other threads:[~2018-01-22 11:19 UTC|newest]
Thread overview: 112+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-21 12:02 [PATCH] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-01-21 12:02 ` Robert P. J. Day
2018-01-22 11:18 ` Duy Nguyen [this message]
2018-01-22 20:17 ` Thomas Gummerer
2018-02-04 22:13 ` [PATCH v2 0/3] " Thomas Gummerer
2018-02-04 22:13 ` [PATCH v2 1/3] worktree: improve message when creating a new worktree Thomas Gummerer
2018-02-05 2:12 ` Duy Nguyen
2018-02-05 20:13 ` Thomas Gummerer
2018-02-05 20:15 ` Junio C Hamano
2018-02-07 8:51 ` Eric Sunshine
2018-02-09 11:27 ` Thomas Gummerer
2018-02-09 12:08 ` Duy Nguyen
2018-02-10 11:20 ` Duy Nguyen
2018-02-04 22:13 ` [PATCH v2 2/3] worktree: be clearer when "add" dwim-ery kicks in Thomas Gummerer
2018-02-04 22:13 ` [PATCH v2 3/3] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-02-05 2:18 ` Duy Nguyen
2018-02-05 20:20 ` Junio C Hamano
2018-02-05 20:23 ` Thomas Gummerer
2018-02-06 11:53 ` Duy Nguyen
2018-02-09 11:04 ` Thomas Gummerer
2018-03-17 22:08 ` [PATCH v3 0/4] " Thomas Gummerer
2018-03-17 22:08 ` [PATCH v3 1/4] worktree: improve message when creating a new worktree Thomas Gummerer
2018-03-17 22:08 ` [PATCH v3 2/4] worktree: be clearer when "add" dwim-ery kicks in Thomas Gummerer
2018-03-17 22:08 ` [PATCH v3 3/4] worktree: factor out dwim_branch function Thomas Gummerer
2018-03-17 22:08 ` [PATCH v3 4/4] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-03-17 22:22 ` [PATCH v4 0/4] " Thomas Gummerer
2018-03-17 22:22 ` [PATCH v4 1/4] worktree: improve message when creating a new worktree Thomas Gummerer
2018-03-19 17:11 ` Duy Nguyen
2018-03-19 18:09 ` Junio C Hamano
2018-03-20 6:37 ` Eric Sunshine
2018-03-24 20:34 ` Thomas Gummerer
2018-03-17 22:22 ` [PATCH v4 2/4] worktree: be clearer when "add" dwim-ery kicks in Thomas Gummerer
2018-03-20 6:40 ` Eric Sunshine
2018-03-20 7:26 ` Eric Sunshine
2018-03-20 7:32 ` Eric Sunshine
2018-03-24 20:35 ` Thomas Gummerer
2018-03-17 22:22 ` [PATCH v4 3/4] worktree: factor out dwim_branch function Thomas Gummerer
2018-03-17 22:22 ` [PATCH v4 4/4] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-03-20 8:02 ` Eric Sunshine
2018-03-24 21:00 ` Thomas Gummerer
2018-03-25 13:49 ` [PATCH v5 0/6] " Thomas Gummerer
2018-03-25 13:49 ` [PATCH v5 1/6] worktree: improve message when creating a new worktree Thomas Gummerer
2018-03-25 13:49 ` [PATCH v5 2/6] worktree: be clearer when "add" dwim-ery kicks in Thomas Gummerer
2018-03-27 8:59 ` Eric Sunshine
2018-03-30 13:53 ` Thomas Gummerer
2018-03-25 13:49 ` [PATCH v5 3/6] worktree: remove force_new_branch from struct add_opts Thomas Gummerer
2018-03-27 9:00 ` Eric Sunshine
2018-03-30 13:55 ` Thomas Gummerer
2018-03-25 13:49 ` [PATCH v5 4/6] worktree: factor out dwim_branch function Thomas Gummerer
2018-03-27 9:01 ` Eric Sunshine
2018-03-25 13:49 ` [PATCH v5 5/6] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-03-27 9:04 ` Eric Sunshine
2018-03-30 14:04 ` Thomas Gummerer
2018-03-25 13:49 ` [PATCH v5 6/6] t2025: rename now outdated branch name Thomas Gummerer
2018-03-27 8:58 ` [PATCH v5 0/6] worktree: teach "add" to check out existing branches Eric Sunshine
2018-03-30 14:08 ` Thomas Gummerer
2018-03-31 15:17 ` [PATCH v6 " Thomas Gummerer
2018-03-31 15:17 ` [PATCH v6 1/6] worktree: remove extra members from struct add_opts Thomas Gummerer
2018-03-31 15:18 ` [PATCH v6 2/6] reset: introduce show-new-head-line option Thomas Gummerer
2018-04-02 20:29 ` Junio C Hamano
2018-04-02 22:07 ` Thomas Gummerer
2018-04-02 22:20 ` Thomas Gummerer
2018-04-02 20:34 ` Junio C Hamano
2018-04-02 22:09 ` Thomas Gummerer
2018-03-31 15:18 ` [PATCH v6 3/6] worktree: improve message when creating a new worktree Thomas Gummerer
2018-04-08 9:27 ` Eric Sunshine
2018-03-31 15:18 ` [PATCH v6 4/6] worktree: be clearer when "add" dwim-ery kicks in Thomas Gummerer
2018-03-31 15:18 ` [PATCH v6 5/6] worktree: factor out dwim_branch function Thomas Gummerer
2018-03-31 15:18 ` [PATCH v6 6/6] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-04-01 13:11 ` [PATCH v6 6.5/6] fixup! " Thomas Gummerer
2018-04-09 0:23 ` Eric Sunshine
2018-04-09 19:44 ` Thomas Gummerer
2018-04-09 21:35 ` Eric Sunshine
2018-04-08 10:09 ` [PATCH v6 6/6] " Eric Sunshine
2018-04-08 14:30 ` Thomas Gummerer
2018-04-08 9:08 ` [PATCH v6 0/6] " Eric Sunshine
2018-04-08 14:24 ` Thomas Gummerer
2018-04-09 0:38 ` Eric Sunshine
2018-04-09 19:47 ` Thomas Gummerer
2018-04-09 19:30 ` Thomas Gummerer
2018-04-09 22:06 ` Eric Sunshine
2018-04-11 20:09 ` Thomas Gummerer
2018-04-11 20:48 ` Eric Sunshine
2018-04-11 20:50 ` Thomas Gummerer
2018-04-11 21:14 ` Eric Sunshine
2018-04-15 20:29 ` [PATCH v7 0/4] " Thomas Gummerer
2018-04-15 20:29 ` [PATCH v7 1/4] worktree: remove extra members from struct add_opts Thomas Gummerer
2018-04-15 20:29 ` [PATCH v7 2/4] worktree: improve message when creating a new worktree Thomas Gummerer
2018-04-16 2:09 ` Junio C Hamano
2018-04-23 18:55 ` Thomas Gummerer
2018-04-23 4:27 ` Eric Sunshine
2018-04-23 18:50 ` Thomas Gummerer
2018-04-15 20:29 ` [PATCH v7 3/4] worktree: factor out dwim_branch function Thomas Gummerer
2018-04-15 20:29 ` [PATCH v7 4/4] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-04-23 4:52 ` [PATCH v7 0/4] " Eric Sunshine
2018-04-23 19:38 ` [PATCH v8 " Thomas Gummerer
2018-04-23 19:38 ` [PATCH v8 1/4] worktree: remove extra members from struct add_opts Thomas Gummerer
2018-04-24 3:26 ` Eric Sunshine
2018-04-23 19:38 ` [PATCH v8 2/4] worktree: improve message when creating a new worktree Thomas Gummerer
2018-04-24 3:58 ` Eric Sunshine
2018-04-23 19:38 ` [PATCH v8 3/4] worktree: factor out dwim_branch function Thomas Gummerer
2018-04-23 19:38 ` [PATCH v8 4/4] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-04-24 4:25 ` Eric Sunshine
2018-04-24 21:56 ` [PATCH v9 0/4] " Thomas Gummerer
2018-04-24 21:56 ` [PATCH v9 1/4] worktree: remove extra members from struct add_opts Thomas Gummerer
2018-04-24 21:56 ` [PATCH v9 2/4] worktree: improve message when creating a new worktree Thomas Gummerer
2018-04-24 21:56 ` [PATCH v9 3/4] worktree: factor out dwim_branch function Thomas Gummerer
2018-04-24 21:56 ` [PATCH v9 4/4] worktree: teach "add" to check out existing branches Thomas Gummerer
2018-04-27 7:36 ` [PATCH v9 0/4] " Eric Sunshine
2018-04-28 16:09 ` Thomas Gummerer
2018-04-30 0:07 ` Junio C Hamano
2018-03-18 0:24 ` [PATCH v3 " Junio C Hamano
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