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Merge branch 'jc/checkout-orphan-warning'

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* jc/checkout-orphan-warning:
  commit: give final warning when reattaching HEAD to leave commits behind
This commit is contained in:
Junio C Hamano 2011-03-15 14:22:16 -07:00
commit ccf6d62d1e
1 changed files with 95 additions and 6 deletions
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101
builtin/checkout.c
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@ -582,6 +582,100 @@ static void update_refs_for_switch(struct checkout_opts *opts,
report_tracking(new);
}
struct rev_list_args {
int argc;
int alloc;
const char **argv;
};
static void add_one_rev_list_arg(struct rev_list_args *args, const char *s)
{
ALLOC_GROW(args->argv, args->argc + 1, args->alloc);
args->argv[args->argc++] = s;
}
static int add_one_ref_to_rev_list_arg(const char *refname,
const unsigned char *sha1,
int flags,
void *cb_data)
{
add_one_rev_list_arg(cb_data, refname);
return 0;
}
static void describe_one_orphan(struct strbuf *sb, struct commit *commit)
{
struct pretty_print_context ctx = { 0 };
parse_commit(commit);
strbuf_addstr(sb, " - ");
pretty_print_commit(CMIT_FMT_ONELINE, commit, sb, &ctx);
strbuf_addch(sb, '\n');
}
#define ORPHAN_CUTOFF 4
static void suggest_reattach(struct commit *commit, struct rev_info *revs)
{
struct commit *c, *last = NULL;
struct strbuf sb = STRBUF_INIT;
int lost = 0;
while ((c = get_revision(revs)) != NULL) {
if (lost < ORPHAN_CUTOFF)
describe_one_orphan(&sb, c);
last = c;
lost++;
}
if (ORPHAN_CUTOFF < lost) {
int more = lost - ORPHAN_CUTOFF;
if (more == 1)
describe_one_orphan(&sb, last);
else
strbuf_addf(&sb, " ... and %d more.\n", more);
}
fprintf(stderr,
"Warning: you are leaving %d commit%s behind, "
"not connected to\n"
"any of your branches:\n\n"
"%s\n"
"If you want to keep them by creating a new branch, "
"this may be a good time\nto do so with:\n\n"
" git branch new_branch_name %s\n\n",
lost, ((1 < lost) ? "s" : ""),
sb.buf,
sha1_to_hex(commit->object.sha1));
strbuf_release(&sb);
}
/*
* We are about to leave commit that was at the tip of a detached
* HEAD. If it is not reachable from any ref, this is the last chance
* for the user to do so without resorting to reflog.
*/
static void orphaned_commit_warning(struct commit *commit)
{
struct rev_list_args args = { 0, 0, NULL };
struct rev_info revs;
add_one_rev_list_arg(&args, "(internal)");
add_one_rev_list_arg(&args, sha1_to_hex(commit->object.sha1));
add_one_rev_list_arg(&args, "--not");
for_each_ref(add_one_ref_to_rev_list_arg, &args);
add_one_rev_list_arg(&args, "--");
add_one_rev_list_arg(&args, NULL);
init_revisions(&revs, NULL);
if (setup_revisions(args.argc - 1, args.argv, &revs, NULL) != 1)
die("internal error: only -- alone should have been left");
if (prepare_revision_walk(&revs))
die("internal error in revision walk");
if (!(commit->object.flags & UNINTERESTING))
suggest_reattach(commit, &revs);
else
describe_detached_head("Previous HEAD position was", commit);
}
static int switch_branches(struct checkout_opts *opts, struct branch_info *new)
{
int ret = 0;
@ -609,13 +703,8 @@ static int switch_branches(struct checkout_opts *opts, struct branch_info *new)
if (ret)
return ret;
/*
* If we were on a detached HEAD, but have now moved to
* a new commit, we want to mention the old commit once more
* to remind the user that it might be lost.
*/
if (!opts->quiet && !old.path && old.commit && new->commit != old.commit)
describe_detached_head("Previous HEAD position was", old.commit);
orphaned_commit_warning(old.commit);
update_refs_for_switch(opts, &old, new);