When running git-commit`, --verbose appends a diff to the prepared
message, while --no-status omits git-status output; thus, one would
expect --verbose --no-status to give a commit message with a diff of
the commit without git-status output.

However, this is not what happens - the prepared commit message body is
empty, entirely. (Needless to say, no diff is appended.) This is because
internally the git-status machinery is used to provide both the diff and
status output, but this machinery is skipped over entirely due to
--no-status.

We introduce a new status_format, STATUS_FORMAT_DIFFONLY, which triggers
the setting of the commitable flag, and the printing of the diff. This
is set only by git-commit, and when it detects that --verbose and
--no-status have been used.

Signed-off-by: Tay Ray Chuan <rcta...@gmail.com>
---

Changed since v1: adopted peff's suggestion in
20140224083312.gb32...@sigill.intra.peff.net, added tests.

 builtin/commit.c          | 12 +++++++++++-
 t/t7507-commit-verbose.sh | 34 +++++++++++++++++++++++++++++++++-
 wt-status.c               |  2 +-
 wt-status.h               |  3 +++
 4 files changed, 48 insertions(+), 3 deletions(-)

diff --git a/builtin/commit.c b/builtin/commit.c
index 254477f..d752899 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -144,6 +144,7 @@ static enum status_format {
        STATUS_FORMAT_LONG,
        STATUS_FORMAT_SHORT,
        STATUS_FORMAT_PORCELAIN,
+       STATUS_FORMAT_DIFFONLY,
 
        STATUS_FORMAT_UNSPECIFIED
 } status_format = STATUS_FORMAT_UNSPECIFIED;
@@ -510,6 +511,10 @@ static int run_status(FILE *fp, const char *index_file, 
const char *prefix, int
        case STATUS_FORMAT_UNSPECIFIED:
                die("BUG: finalize_deferred_config() should have been called");
                break;
+       case STATUS_FORMAT_DIFFONLY:
+               wt_status_mark_commitable(s);
+               wt_status_print_verbose(s);
+               break;
        case STATUS_FORMAT_NONE:
        case STATUS_FORMAT_LONG:
                wt_status_print(s);
@@ -1213,7 +1218,12 @@ static int parse_and_validate_options(int argc, const 
char *argv[],
        if (all && argc > 0)
                die(_("Paths with -a does not make sense."));
 
-       if (status_format != STATUS_FORMAT_NONE)
+       if (status_format == STATUS_FORMAT_NONE) {
+               if (verbose && !include_status) {
+                       include_status = 1;
+                       status_format = STATUS_FORMAT_DIFFONLY;
+               }
+       } else
                dry_run = 1;
 
        return argc;
diff --git a/t/t7507-commit-verbose.sh b/t/t7507-commit-verbose.sh
index 2ddf28c..9027dd4 100755
--- a/t/t7507-commit-verbose.sh
+++ b/t/t7507-commit-verbose.sh
@@ -26,7 +26,39 @@ test_expect_success 'initial commit shows verbose diff' '
        git commit --amend -v
 '
 
-test_expect_success 'second commit' '
+test_expect_success '--verbose appends diff' '
+       cat >expected <<-\EOF &&
+       # ------------------------ >8 ------------------------
+       # Do not touch the line above.
+       # Everything below will be removed.
+       diff --git a/file b/file
+       index d95f3ad..94ab063 100644
+       --- a/file
+       +++ b/file
+       @@ -1 +1,2 @@
+        content
+       +content content
+       EOF
+       cat >editor <<-\EOF &&
+       #!/bin/sh
+       awk "/^# -+ >8 -+$/ { p=1 } p" "$1" >actual
+       echo commit > "$1"
+       EOF
+       chmod 755 editor &&
+       echo content content >> file &&
+       git add file &&
+       test_tick &&
+       EDITOR=./editor git commit --verbose &&
+       test_cmp expected actual
+'
+
+test_expect_success '--verbose --no-status appends diff' '
+       git reset --soft HEAD^ &&
+       EDITOR=./editor git commit --verbose --no-status &&
+       test_cmp expected actual
+'
+
+test_expect_success 'commit' '
        echo content modified >file &&
        git add file &&
        git commit -F message
diff --git a/wt-status.c b/wt-status.c
index 87550ae..c4f7e48 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -857,7 +857,7 @@ void wt_status_add_cut_line(FILE *fp)
        strbuf_release(&buf);
 }
 
-static void wt_status_print_verbose(struct wt_status *s)
+void wt_status_print_verbose(struct wt_status *s)
 {
        struct rev_info rev;
        struct setup_revision_opt opt;
diff --git a/wt-status.h b/wt-status.h
index e0a99f7..4388296 100644
--- a/wt-status.h
+++ b/wt-status.h
@@ -98,8 +98,11 @@ void wt_status_add_cut_line(FILE *fp);
 void wt_status_prepare(struct wt_status *s);
 void wt_status_print(struct wt_status *s);
 void wt_status_collect(struct wt_status *s);
+void wt_status_mark_commitable(struct wt_status *state);
 void wt_status_get_state(struct wt_status_state *state, int get_detached_from);
 
+void wt_status_print_verbose(struct wt_status *s);
+
 void wt_shortstatus_print(struct wt_status *s);
 void wt_porcelain_print(struct wt_status *s);
 
-- 
2.0.0.581.g64f2558

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