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checkout: allow dwim for branch creation for "git checkout $branch --"

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The "--" notation disambiguates files and branches, but as a side-effect
of the previous implementation, also disabled the branch auto-creation
when $branch does not exist.

A possible scenario is then:

git checkout $branch
=> fails if $branch is both a ref and a file, and suggests --

git checkout $branch --
=> refuses to create the $branch

This patch allows the second form to create $branch, and since the -- is
provided, it does not look for file named $branch.

Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Matthieu Moy 2013-10-18 11:25:57 +02:00 committed by Junio C Hamano
parent 69490f3459
commit a047fafc78
2 changed files with 76 additions and 23 deletions
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78
builtin/checkout.c
View file

@ -884,20 +884,30 @@ static int parse_branchname_arg(int argc, const char **argv,
*
* everything after the '--' must be paths.
*
* case 3: git checkout <something> [<paths>]
* case 3: git checkout <something> [--]
*
* With no paths, if <something> is a commit, that is to
* switch to the branch or detach HEAD at it. As a special case,
* if <something> is A...B (missing A or B means HEAD but you can
* omit at most one side), and if there is a unique merge base
* between A and B, A...B names that merge base.
* (a) If <something> is a commit, that is to
* switch to the branch or detach HEAD at it. As a special case,
* if <something> is A...B (missing A or B means HEAD but you can
* omit at most one side), and if there is a unique merge base
* between A and B, A...B names that merge base.
*
* With no paths, if <something> is _not_ a commit, no -t nor -b
* was given, and there is a tracking branch whose name is
* <something> in one and only one remote, then this is a short-hand
* to fork local <something> from that remote-tracking branch.
* (b) If <something> is _not_ a commit, either "--" is present
* or <something> is not a path, no -t nor -b was given, and
* and there is a tracking branch whose name is <something>
* in one and only one remote, then this is a short-hand to
* fork local <something> from that remote-tracking branch.
*
* Otherwise <something> shall not be ambiguous.
* (c) Otherwise, if "--" is present, treat it like case (1).
*
* (d) Otherwise :
* - if it's a reference, treat it like case (1)
* - else if it's a path, treat it like case (2)
* - else: fail.
*
* case 4: git checkout <something> <paths>
*
* The first argument must not be ambiguous.
* - If it's *only* a reference, treat it like case (1).
* - If it's only a path, treat it like case (2).
* - else: fail.
@ -916,18 +926,40 @@ static int parse_branchname_arg(int argc, const char **argv,
arg = "@{-1}";
if (get_sha1_mb(arg, rev)) {
if (has_dash_dash) /* case (1) */
die(_("invalid reference: %s"), arg);
if (dwim_new_local_branch_ok &&
!check_filename(NULL, arg) &&
argc == 1) {
/*
* Either case (3) or (4), with <something> not being
* a commit, or an attempt to use case (1) with an
* invalid ref.
*
* It's likely an error, but we need to find out if
* we should auto-create the branch, case (3).(b).
*/
int recover_with_dwim = dwim_new_local_branch_ok;
if (check_filename(NULL, arg) && !has_dash_dash)
recover_with_dwim = 0;
/*
* Accept "git checkout foo" and "git checkout foo --"
* as candidates for dwim.
*/
if (!(argc == 1 && !has_dash_dash) &&
!(argc == 2 && has_dash_dash))
recover_with_dwim = 0;
if (recover_with_dwim) {
const char *remote = unique_tracking_name(arg, rev);
if (!remote)
return argcount;
*new_branch = arg;
arg = remote;
/* DWIMmed to create local branch */
} else {
if (remote) {
*new_branch = arg;
arg = remote;
/* DWIMmed to create local branch, case (3).(b) */
} else {
recover_with_dwim = 0;
}
}
if (!recover_with_dwim) {
if (has_dash_dash)
die(_("invalid reference: %s"), arg);
return argcount;
}
}
@ -957,7 +989,7 @@ static int parse_branchname_arg(int argc, const char **argv,
if (!*source_tree) /* case (1): want a tree */
die(_("reference is not a tree: %s"), arg);
if (!has_dash_dash) {/* case (3 -> 1) */
if (!has_dash_dash) {/* case (3).(d) -> (1) */
/*
* Do not complain the most common case
* git checkout branch

21
t/t2024-checkout-dwim.sh
View file

@ -164,4 +164,25 @@ test_expect_success 'checkout of branch from a single remote succeeds #4' '
test_branch_upstream eggs repo_d eggs
'
test_expect_success 'checkout of branch with a file having the same name fails' '
git checkout -B master &&
test_might_fail git branch -D spam &&
>spam &&
test_must_fail git checkout spam &&
test_must_fail git rev-parse --verify refs/heads/spam &&
test_branch master
'
test_expect_success 'checkout <branch> -- succeeds, even if a file with the same name exists' '
git checkout -B master &&
test_might_fail git branch -D spam &&
>spam &&
git checkout spam -- &&
test_branch spam &&
test_cmp_rev refs/remotes/extra_dir/repo_c/extra_dir/spam HEAD &&
test_branch_upstream spam repo_c spam
'
test_done