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get_worktrees() must return main worktree as first item even on error

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This is required by git-worktree.txt, stating that the main worktree is
the first line (especially in --porcelain mode when we can't just change
behavior at will).

There's only one case when get_worktrees() may skip main worktree, when
parse_ref() fails. Update the code so that we keep first item as main
worktree and return something sensible in this case:

 - In user-friendly mode, since we're not constraint by anything,
   returning "(error)" should do the job (we already show "(detached
   HEAD)" which is not machine-friendly). Actually errors should be
   printed on stderr by parse_ref() (*)

 - In plumbing mode, we do not show neither 'bare', 'detached' or
   'branch ...', which is possible by the format description if I read
   it right.

Careful readers may realize that when the local variable "head_ref" in
get_main_worktree() is emptied, add_head_info() will do nothing to
wt->head_sha1. But that's ok because head_sha1 is zero-ized in the
previous patch.

(*) Well, it does not. But it's supposed to be a stop gap implementation
    until we can reuse refs code to parse "ref: " stuff in HEAD, from
    resolve_refs_unsafe(). Now may be the time since refs refactoring is
    mostly done.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy
2016-11-28 16:36:54 +07:00
committed by Junio C Hamano
parent 96f09e2a11
commit a234563a3b
3 changed files with 28 additions and 9 deletions
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6
builtin/worktree.c
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@ -388,7 +388,7 @@ static void show_worktree_porcelain(struct worktree *wt)
printf("HEAD %s\n", sha1_to_hex(wt->head_sha1));
if (wt->is_detached)
printf("detached\n");
else
else if (wt->head_ref)
printf("branch %s\n", wt->head_ref);
}
printf("\n");
@ -408,8 +408,10 @@ static void show_worktree(struct worktree *wt, int path_maxlen, int abbrev_len)
find_unique_abbrev(wt->head_sha1, DEFAULT_ABBREV));
if (wt->is_detached)
strbuf_addstr(&sb, "(detached HEAD)");
else
else if (wt->head_ref)
strbuf_addf(&sb, "[%s]", shorten_unambiguous_ref(wt->head_ref, 0));
else
strbuf_addstr(&sb, "(error)");
}
printf("%s\n", sb.buf);