Re: [PATCH 17/21] list-files: show directories as well as files

[Eric Sunshine <sunshine@sunshineco.com>]

On Sun, Jan 25, 2015 at 7:37 AM, Nguyễn Thái Ngọc Duy <pclouds@gmail.com> wrote:
> The index does not store directories explicitly (except submodules) so
> we have to figure them out from file list when output lis depth-limited.
>
> The function show_as_directory() deliberately generates duplicate
> directories and expects the previous patch to remove duplicates.
>
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
> ---
> diff --git a/builtin/ls-files.c b/builtin/ls-files.c
> index 1a1c9c8..29b5c2e 100644
> --- a/builtin/ls-files.c
> +++ b/builtin/ls-files.c
> @@ -179,6 +181,35 @@ static void show_killed_files(struct dir_struct *dir)
>         }
>  }
>
> +static int show_as_directory(const struct cache_entry *ce)
> +{
> +       struct strbuf sb = STRBUF_INIT;
> +       const char *p;
> +
> +       strbuf_add(&sb, ce->name, ce_namelen(ce));
> +       while (sb.len && (p = strrchr(sb.buf, '/')) != NULL) {
> +               struct strbuf sb2 = STRBUF_INIT;
> +               strbuf_setlen(&sb, p - sb.buf);
> +               if (!match_pathspec(&pathspec, sb.buf, sb.len,
> +                                   max_prefix_len, NULL, 1))
> +                       continue;
> +               write_name(&sb2, sb.buf);
> +               if (want_color(use_color)) {
> +                       struct strbuf sb3 = STRBUF_INIT;
> +                       color_filename(&sb3, ce->name, sb2.buf, S_IFDIR, 1);
> +                       strbuf_release(&sb2);
> +                       sb2 = sb3;

Although more expensive, would it be a bit more idiomatic and obvious
to phrase this as

    strbuf_swap(&sb2, &sb3);
    strbuf_release(&sb3);

or is it not worth it?

> +               }
> +               if (show_tag)
> +                       strbuf_insert(&sb2, 0, tag_cached, strlen(tag_cached));
> +               strbuf_fputs(&sb2, strbuf_detach(&sb, NULL), NULL);

The detached strbuf content gets assigned to the 'util' field of the
'struct string_list output' item and is eventually leaked, however,
the program exits soon after. Okay.

> +               strbuf_release(&sb2);
> +               return 1;
> +       }
> +       strbuf_release(&sb);
> +       return 0;
> +}
> +
>  static void write_ce_name(struct strbuf *sb, const struct cache_entry *ce)
>  {
>         struct strbuf quoted = STRBUF_INIT;