Jens Lehmann <jens.lehm...@web.de> writes:
> When using the '-v' option of "git commit" the diff added to the commit
> message temporarily for editing is stripped off after the user exited the
> editor by searching for "\ndiff --git " and truncating the commmit message
> there if it is found.
>
> But this approach has two problems:
>
> - when the commit message itself contains a line starting with
> "diff --git" it will be truncated there prematurely; and
>
> - when the "diff.submodule" setting is set to "log", the diff may
> start with "Submodule <hash1>..<hash2>", which will be left in
> the commit message while it shouldn't.
>
> Fix that by introducing a special scissor separator line starting with the
> comment character ('#' or the core.commentChar config if set) followed by
> two lines describing what it is for. The scissor line - which will not be
> translated - is used to reliably detect the start of the diff so it can be
> chopped off from the commit message, no matter what the user enters there.
>
> Turn a known test failure fixed by this change into a successful test;
> also add one for a diff starting with a submodule log and another one for
> proper handling of the comment char.
>
> Reported-by: Ari Pollak <a...@debian.org>
> Signed-off-by: Jens Lehmann <jens.lehm...@web.de>
> ---
>
> Changes to v3:
>
> - separating comment_line_char from the cut_line
>
> - using strbuf_add_commented_lines() for the comment
>
> All issues raised should be addressed with this version.
Nicely done.
Thanks, will replace and queue.
> builtin/commit.c | 9 +++------
> t/t7507-commit-verbose.sh | 28 +++++++++++++++++++++++++++-
> wt-status.c | 29 +++++++++++++++++++++++++++--
> wt-status.h | 1 +
> 4 files changed, 58 insertions(+), 9 deletions(-)
>
> diff --git a/builtin/commit.c b/builtin/commit.c
> index 6ab4605..fedb45a 100644
> --- a/builtin/commit.c
> +++ b/builtin/commit.c
> @@ -1505,7 +1505,7 @@ int cmd_commit(int argc, const char **argv, const char
> *prefix)
> struct strbuf sb = STRBUF_INIT;
> struct strbuf author_ident = STRBUF_INIT;
> const char *index_file, *reflog_msg;
> - char *nl, *p;
> + char *nl;
> unsigned char sha1[20];
> struct ref_lock *ref_lock;
> struct commit_list *parents = NULL, **pptr = &parents;
> @@ -1601,11 +1601,8 @@ int cmd_commit(int argc, const char **argv, const char
> *prefix)
> }
>
> /* Truncate the message just before the diff, if any. */
> - if (verbose) {
> - p = strstr(sb.buf, "\ndiff --git ");
> - if (p != NULL)
> - strbuf_setlen(&sb, p - sb.buf + 1);
> - }
> + if (verbose)
> + wt_status_truncate_message_at_cut_line(&sb);
>
> if (cleanup_mode != CLEANUP_NONE)
> stripspace(&sb, cleanup_mode == CLEANUP_ALL);
> diff --git a/t/t7507-commit-verbose.sh b/t/t7507-commit-verbose.sh
> index da5bd3b..2ddf28c 100755
> --- a/t/t7507-commit-verbose.sh
> +++ b/t/t7507-commit-verbose.sh
> @@ -65,9 +65,35 @@ test_expect_success 'diff in message is retained without
> -v' '
> check_message diff
> '
>
> -test_expect_failure 'diff in message is retained with -v' '
> +test_expect_success 'diff in message is retained with -v' '
> git commit --amend -F diff -v &&
> check_message diff
> '
>
> +test_expect_success 'submodule log is stripped out too with -v' '
> + git config diff.submodule log &&
> + git submodule add ./. sub &&
> + git commit -m "sub added" &&
> + (
> + cd sub &&
> + echo "more" >>file &&
> + git commit -a -m "submodule commit"
> + ) &&
> + (
> + GIT_EDITOR=cat &&
> + export GIT_EDITOR &&
> + test_must_fail git commit -a -v 2>err
> + ) &&
> + test_i18ngrep "Aborting commit due to empty commit message." err
> +'
> +
> +test_expect_success 'verbose diff is stripped out with set core.commentChar'
> '
> + (
> + GIT_EDITOR=cat &&
> + export GIT_EDITOR &&
> + test_must_fail git -c core.commentchar=";" commit -a -v 2>err
> + ) &&
> + test_i18ngrep "Aborting commit due to empty commit message." err
> +'
> +
> test_done
> diff --git a/wt-status.c b/wt-status.c
> index b4e44ba..99c3d1c 100644
> --- a/wt-status.c
> +++ b/wt-status.c
> @@ -16,6 +16,9 @@
> #include "column.h"
> #include "strbuf.h"
>
> +static char cut_line[] =
> +"------------------------ >8 ------------------------\n";
> +
> static char default_wt_status_colors[][COLOR_MAXLEN] = {
> GIT_COLOR_NORMAL, /* WT_STATUS_HEADER */
> GIT_COLOR_GREEN, /* WT_STATUS_UPDATED */
> @@ -767,6 +770,18 @@ conclude:
> status_printf_ln(s, GIT_COLOR_NORMAL, "");
> }
>
> +void wt_status_truncate_message_at_cut_line(struct strbuf *buf)
> +{
> + const char *p;
> + struct strbuf pattern = STRBUF_INIT;
> +
> + strbuf_addf(&pattern, "%c %s", comment_line_char, cut_line);
> + p = strstr(buf->buf, pattern.buf);
> + if (p && (p == buf->buf || p[-1] == '\n'))
> + strbuf_setlen(buf, p - buf->buf);
> + strbuf_release(&pattern);
> +}
> +
> static void wt_status_print_verbose(struct wt_status *s)
> {
> struct rev_info rev;
> @@ -787,10 +802,20 @@ static void wt_status_print_verbose(struct wt_status *s)
> * If we're not going to stdout, then we definitely don't
> * want color, since we are going to the commit message
> * file (and even the "auto" setting won't work, since it
> - * will have checked isatty on stdout).
> + * will have checked isatty on stdout). But we then do want
> + * to insert the scissor line here to reliably remove the
> + * diff before committing.
> */
> - if (s->fp != stdout)
> + if (s->fp != stdout) {
> + const char *explanation = _("Do not touch the line
> above.\nEverything below will be removed.");
> + struct strbuf buf = STRBUF_INIT;
> +
> rev.diffopt.use_color = 0;
> + fprintf(s->fp, "%c %s", comment_line_char, cut_line);
> + strbuf_add_commented_lines(&buf, explanation,
> strlen(explanation));
> + fprintf(s->fp, buf.buf);
> + strbuf_release(&buf);
> + }
> run_diff_index(&rev, 1);
> }
>
> diff --git a/wt-status.h b/wt-status.h
> index 6c29e6f..30a4812 100644
> --- a/wt-status.h
> +++ b/wt-status.h
> @@ -91,6 +91,7 @@ struct wt_status_state {
> unsigned char cherry_pick_head_sha1[20];
> };
>
> +void wt_status_truncate_message_at_cut_line(struct strbuf *);
> void wt_status_prepare(struct wt_status *s);
> void wt_status_print(struct wt_status *s);
> void wt_status_collect(struct wt_status *s);
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