Fix a bug where the scissors line is placed after the Conflicts:
section, in the case where a merge conflict occurs and
commit.cleanup = scissors.

Note that the removal of the if-else tower in git_sequencer_config may
appear to be a no-op refactor but it actually isn't. First of all, we
now accept "default". More importantly, though, if
commit.cleanup = scissors, the cleanup enum will be set to
COMMIT_MSG_CLEANUP_SCISSORS instead of COMMIT_MSG_CLEANUP_SPACE when we
are reverting or cherry-picking. This allows us to append scissors to
MERGE_MSG in the case of a conflict.

Signed-off-by: Denton Liu <liu.den...@gmail.com>
---
 Documentation/git-cherry-pick.txt |  7 +++
 Documentation/git-revert.txt      |  7 +++
 builtin/merge.c                   | 13 ++---
 builtin/rebase--helper.c          |  2 +-
 builtin/revert.c                  |  5 ++
 sequencer.c                       | 32 +++++------
 sequencer.h                       |  3 +-
 t/t3507-cherry-pick-conflict.sh   | 88 +++++++++++++++++++++++++++++++
 8 files changed, 127 insertions(+), 30 deletions(-)

diff --git a/Documentation/git-cherry-pick.txt 
b/Documentation/git-cherry-pick.txt
index d35d771fc8..5c086d78c8 100644
--- a/Documentation/git-cherry-pick.txt
+++ b/Documentation/git-cherry-pick.txt
@@ -57,6 +57,13 @@ OPTIONS
        With this option, 'git cherry-pick' will let you edit the commit
        message prior to committing.
 
+--cleanup=<mode>::
+       This option determines how the commit message will be cleaned up before
+       being passed on. See linkgit:git-commit[1] for more details. In
+       addition, if the '<mode>' is given a value of `scissors`, scissors will
+       be prepended to MERGE_MSG before being passed on in the case of a
+       conflict.
+
 -x::
        When recording the commit, append a line that says
        "(cherry picked from commit ...)" to the original commit
diff --git a/Documentation/git-revert.txt b/Documentation/git-revert.txt
index 837707a8fd..1894010e60 100644
--- a/Documentation/git-revert.txt
+++ b/Documentation/git-revert.txt
@@ -66,6 +66,13 @@ more details.
        With this option, 'git revert' will not start the commit
        message editor.
 
+--cleanup=<mode>::
+       This option determines how the commit message will be cleaned up before
+       being passed on. See linkgit:git-commit[1] for more details. In
+       addition, if the '<mode>' is given a value of `scissors`, scissors will
+       be prepended to MERGE_MSG before being passed on in the case of a
+       conflict.
+
 -n::
 --no-commit::
        Usually the command automatically creates some commits with
diff --git a/builtin/merge.c b/builtin/merge.c
index 92efc3d8fa..d4217ebcf5 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -913,17 +913,10 @@ static int suggest_conflicts(void)
         * We can't use cleanup_mode because if we're not using the editor,
         * get_cleanup_mode will return COMMIT_MSG_CLEANUP_SPACE instead, even
         * though the message is meant to be processed later by git-commit.
-        * Thus, we will get the cleanup mode is returned we _are_ using an
-        * editor.
+        * Thus, we will get the cleanup mode which is returned when we _are_ 
using
+        * an editor.
         */
-       if (get_cleanup_mode(cleanup_arg, 1) == COMMIT_MSG_CLEANUP_SCISSORS) {
-           fputc('\n', fp);
-           wt_status_add_cut_line(fp);
-           /* comments out the newline from append_conflicts_hint */
-           fputc(comment_line_char, fp);
-       }
-
-       append_conflicts_hint(&msgbuf);
+       append_conflicts_hint(&msgbuf, get_cleanup_mode(cleanup_arg, 1));
        fputs(msgbuf.buf, fp);
        strbuf_release(&msgbuf);
        fclose(fp);
diff --git a/builtin/rebase--helper.c b/builtin/rebase--helper.c
index f7c2a5fdc8..5f1bc9d383 100644
--- a/builtin/rebase--helper.c
+++ b/builtin/rebase--helper.c
@@ -48,10 +48,10 @@ int cmd_rebase__helper(int argc, const char **argv, const 
char *prefix)
                OPT_END()
        };
 
+       opts.action = REPLAY_INTERACTIVE_REBASE;
        sequencer_init_config(&opts);
        git_config_get_bool("rebase.abbreviatecommands", &abbreviate_commands);
 
-       opts.action = REPLAY_INTERACTIVE_REBASE;
        opts.allow_ff = 1;
        opts.allow_empty = 1;
 
diff --git a/builtin/revert.c b/builtin/revert.c
index 9a66720cfc..fe18036be7 100644
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -95,11 +95,13 @@ static int run_sequencer(int argc, const char **argv, 
struct replay_opts *opts)
 {
        const char * const * usage_str = revert_or_cherry_pick_usage(opts);
        const char *me = action_name(opts);
+       const char *cleanup_arg = NULL;
        int cmd = 0;
        struct option base_options[] = {
                OPT_CMDMODE(0, "quit", &cmd, N_("end revert or cherry-pick 
sequence"), 'q'),
                OPT_CMDMODE(0, "continue", &cmd, N_("resume revert or 
cherry-pick sequence"), 'c'),
                OPT_CMDMODE(0, "abort", &cmd, N_("cancel revert or cherry-pick 
sequence"), 'a'),
+               OPT_STRING(0, "cleanup", &cleanup_arg, N_("default"), N_("how 
to strip spaces and #comments from message")),
                OPT_BOOL('n', "no-commit", &opts->no_commit, N_("don't 
automatically commit")),
                OPT_BOOL('e', "edit", &opts->edit, N_("edit the commit 
message")),
                OPT_NOOP_NOARG('r', NULL),
@@ -136,6 +138,9 @@ static int run_sequencer(int argc, const char **argv, 
struct replay_opts *opts)
        if (opts->keep_redundant_commits)
                opts->allow_empty = 1;
 
+       if (cleanup_arg)
+               opts->default_msg_cleanup = get_cleanup_mode(cleanup_arg, 1);
+
        /* Check for incompatible command line arguments */
        if (cmd) {
                char *this_operation;
diff --git a/sequencer.c b/sequencer.c
index 707e72fb39..5c04bae7ac 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -153,6 +153,11 @@ static GIT_PATH_FUNC(rebase_path_strategy, 
"rebase-merge/strategy")
 static GIT_PATH_FUNC(rebase_path_strategy_opts, "rebase-merge/strategy_opts")
 static GIT_PATH_FUNC(rebase_path_allow_rerere_autoupdate, 
"rebase-merge/allow_rerere_autoupdate")
 
+static inline int is_rebase_i(const struct replay_opts *opts)
+{
+       return opts->action == REPLAY_INTERACTIVE_REBASE;
+}
+
 static int git_sequencer_config(const char *k, const char *v, void *cb)
 {
        struct replay_opts *opts = cb;
@@ -165,17 +170,7 @@ static int git_sequencer_config(const char *k, const char 
*v, void *cb)
                if (status)
                        return status;
 
-               if (!strcmp(s, "verbatim"))
-                       opts->default_msg_cleanup = COMMIT_MSG_CLEANUP_NONE;
-               else if (!strcmp(s, "whitespace"))
-                       opts->default_msg_cleanup = COMMIT_MSG_CLEANUP_SPACE;
-               else if (!strcmp(s, "strip"))
-                       opts->default_msg_cleanup = COMMIT_MSG_CLEANUP_ALL;
-               else if (!strcmp(s, "scissors"))
-                       opts->default_msg_cleanup = COMMIT_MSG_CLEANUP_SPACE;
-               else
-                       warning(_("invalid commit message cleanup mode '%s'"),
-                                 s);
+               opts->default_msg_cleanup = get_cleanup_mode(s, 
!is_rebase_i(opts));
 
                free((char *)s);
                return status;
@@ -199,11 +194,6 @@ void sequencer_init_config(struct replay_opts *opts)
        git_config(git_sequencer_config, opts);
 }
 
-static inline int is_rebase_i(const struct replay_opts *opts)
-{
-       return opts->action == REPLAY_INTERACTIVE_REBASE;
-}
-
 static const char *get_dir(const struct replay_opts *opts)
 {
        if (is_rebase_i(opts))
@@ -516,10 +506,16 @@ enum commit_msg_cleanup_mode get_cleanup_mode(const char 
*cleanup_arg,
                die(_("Invalid cleanup mode %s"), cleanup_arg);
 }
 
-void append_conflicts_hint(struct strbuf *msgbuf)
+void append_conflicts_hint(struct strbuf *msgbuf, enum commit_msg_cleanup_mode 
cleanup_mode)
 {
        int i;
 
+       if (cleanup_mode == COMMIT_MSG_CLEANUP_SCISSORS) {
+               strbuf_addch(msgbuf, '\n');
+               wt_status_append_cut_line(msgbuf);
+               strbuf_addch(msgbuf, comment_line_char);
+       }
+
        strbuf_addch(msgbuf, '\n');
        strbuf_commented_addf(msgbuf, "Conflicts:\n");
        for (i = 0; i < active_nr;) {
@@ -586,7 +582,7 @@ static int do_recursive_merge(struct commit *base, struct 
commit *next,
                        _(action_name(opts)));
 
        if (!clean)
-               append_conflicts_hint(msgbuf);
+               append_conflicts_hint(msgbuf, opts->default_msg_cleanup);
 
        return !clean;
 }
diff --git a/sequencer.h b/sequencer.h
index 5690e0c27e..aa99503dd7 100644
--- a/sequencer.h
+++ b/sequencer.h
@@ -91,7 +91,8 @@ int rearrange_squash(void);
 extern const char sign_off_header[];
 
 void append_signoff(struct strbuf *msgbuf, int ignore_footer, unsigned flag);
-void append_conflicts_hint(struct strbuf *msgbuf);
+void append_conflicts_hint(struct strbuf *msgbuf,
+               enum commit_msg_cleanup_mode cleanup_mode);
 enum commit_msg_cleanup_mode get_cleanup_mode(const char *cleanup_arg,
        int use_editor);
 
diff --git a/t/t3507-cherry-pick-conflict.sh b/t/t3507-cherry-pick-conflict.sh
index 74ff925526..c94e44dad0 100755
--- a/t/t3507-cherry-pick-conflict.sh
+++ b/t/t3507-cherry-pick-conflict.sh
@@ -189,6 +189,48 @@ test_expect_success 'failed cherry-pick registers 
participants in index' '
        test_cmp expected actual
 '
 
+test_expect_success \
+       'cherry-pick conflict, ensure commit.cleanup = scissors places scissors 
line properly' '
+       pristine_detach initial &&
+       git config commit.cleanup scissors &&
+       cat <<-EOF >expected &&
+               picked
+
+               # ------------------------ >8 ------------------------
+               # Do not modify or remove the line above.
+               # Everything below it will be ignored.
+               #
+               # Conflicts:
+               #       foo
+               EOF
+
+       test_must_fail git cherry-pick picked &&
+
+       sed "s/[a-f0-9]\{40\}/objid/" .git/MERGE_MSG >actual &&
+       test_i18ncmp expected actual
+'
+
+test_expect_success \
+       'cherry-pick conflict, ensure cleanup=scissors places scissors line 
properly' '
+       pristine_detach initial &&
+       git config --unset commit.cleanup &&
+       cat <<-EOF >expected &&
+               picked
+
+               # ------------------------ >8 ------------------------
+               # Do not modify or remove the line above.
+               # Everything below it will be ignored.
+               #
+               # Conflicts:
+               #       foo
+               EOF
+
+       test_must_fail git cherry-pick --cleanup=scissors picked &&
+
+       sed "s/[a-f0-9]\{40\}/objid/" .git/MERGE_MSG >actual &&
+       test_i18ncmp expected actual
+'
+
 test_expect_success 'failed cherry-pick describes conflict in work tree' '
        pristine_detach initial &&
        cat <<-EOF >expected &&
@@ -335,6 +377,52 @@ test_expect_success 'revert conflict, diff3 -m style' '
        test_cmp expected actual
 '
 
+test_expect_success \
+       'revert conflict, ensure commit.cleanup = scissors places scissors line 
properly' '
+       pristine_detach initial &&
+       git config commit.cleanup scissors &&
+       cat >expected <<-EOF &&
+               Revert "picked"
+
+               This reverts commit objid.
+
+               # ------------------------ >8 ------------------------
+               # Do not modify or remove the line above.
+               # Everything below it will be ignored.
+               #
+               # Conflicts:
+               #       foo
+               EOF
+
+       test_must_fail git revert picked &&
+
+       sed "s/[a-f0-9]\{40\}/objid/" .git/MERGE_MSG >actual &&
+       test_i18ncmp expected actual
+'
+
+test_expect_success \
+       'revert conflict, ensure cleanup=scissors places scissors line 
properly' '
+       pristine_detach initial &&
+       git config --unset commit.cleanup &&
+       cat >expected <<-EOF &&
+               Revert "picked"
+
+               This reverts commit objid.
+
+               # ------------------------ >8 ------------------------
+               # Do not modify or remove the line above.
+               # Everything below it will be ignored.
+               #
+               # Conflicts:
+               #       foo
+               EOF
+
+       test_must_fail git revert --cleanup=scissors picked &&
+
+       sed "s/[a-f0-9]\{40\}/objid/" .git/MERGE_MSG >actual &&
+       test_i18ncmp expected actual
+'
+
 test_expect_success 'failed cherry-pick does not forget -s' '
        pristine_detach initial &&
        test_must_fail git cherry-pick -s picked &&
-- 
2.21.0.368.gbf248417d7

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