When a commit is reverted (or cherry-picked with -x) we add an English
sentence recording that commit id in the new commit message. Make
these real trailer lines instead so that they are more friendly to
parsers (especially "git interpret-trailers").

A reverted commit will have a new trailer

    Revert: <commit-id>

Similarly a cherry-picked commit with -x will have

    Cherry-Pick: <commit-id>

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 I think standardizing how we record commit ids in the commit message
 is a good idea. Though to be honest this started because of my irk of
 an English string "cherry picked from..." that cannot be translated.
 It might as well be a computer language that happens to look like
 English.

 Documentation/git-cherry-pick.txt |  5 ++---
 sequencer.c                       | 20 ++++++--------------
 t/t3510-cherry-pick-sequence.sh   | 12 ++++++------
 t/t3511-cherry-pick-x.sh          | 26 +++++++++++++-------------
 4 files changed, 27 insertions(+), 36 deletions(-)

diff --git a/Documentation/git-cherry-pick.txt 
b/Documentation/git-cherry-pick.txt
index d35d771fc8..8ffbaed1a0 100644
--- a/Documentation/git-cherry-pick.txt
+++ b/Documentation/git-cherry-pick.txt
@@ -58,9 +58,8 @@ OPTIONS
        message prior to committing.
 
 -x::
-       When recording the commit, append a line that says
-       "(cherry picked from commit ...)" to the original commit
-       message in order to indicate which commit this change was
+       When recording the commit, append "Cherry-Pick:" trailer line
+       recording the commit name which commit this change was
        cherry-picked from.  This is done only for cherry
        picks without conflicts.  Do not use this option if
        you are cherry-picking from your private branch because
diff --git a/sequencer.c b/sequencer.c
index 9e1ab3a2a7..f7318f2862 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -36,7 +36,6 @@
 #define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
 
 const char sign_off_header[] = "Signed-off-by: ";
-static const char cherry_picked_prefix[] = "(cherry picked from commit ";
 
 GIT_PATH_FUNC(git_path_commit_editmsg, "COMMIT_EDITMSG")
 
@@ -1758,16 +1757,10 @@ static int do_pick_commit(enum todo_command command, 
struct commit *commit,
                base_label = msg.label;
                next = parent;
                next_label = msg.parent_label;
-               strbuf_addstr(&msgbuf, "Revert \"");
-               strbuf_addstr(&msgbuf, msg.subject);
-               strbuf_addstr(&msgbuf, "\"\n\nThis reverts commit ");
-               strbuf_addstr(&msgbuf, oid_to_hex(&commit->object.oid));
-
-               if (commit->parents && commit->parents->next) {
-                       strbuf_addstr(&msgbuf, ", reversing\nchanges made to ");
-                       strbuf_addstr(&msgbuf, oid_to_hex(&parent->object.oid));
-               }
-               strbuf_addstr(&msgbuf, ".\n");
+               strbuf_addf(&msgbuf, "Revert \"%s\"\n\n", msg.subject);
+
+               strbuf_addf(&msgbuf, "Revert: %s\n",
+                           oid_to_hex(&commit->object.oid));
        } else {
                const char *p;
 
@@ -1784,9 +1777,8 @@ static int do_pick_commit(enum todo_command command, 
struct commit *commit,
                        strbuf_complete_line(&msgbuf);
                        if (!has_conforming_footer(&msgbuf, NULL, 0))
                                strbuf_addch(&msgbuf, '\n');
-                       strbuf_addstr(&msgbuf, cherry_picked_prefix);
-                       strbuf_addstr(&msgbuf, oid_to_hex(&commit->object.oid));
-                       strbuf_addstr(&msgbuf, ")\n");
+                       strbuf_addf(&msgbuf, "Cherry-Pick: %s\n",
+                                   oid_to_hex(&commit->object.oid));
                }
                if (!is_fixup(command))
                        author = get_author(msg.message);
diff --git a/t/t3510-cherry-pick-sequence.sh b/t/t3510-cherry-pick-sequence.sh
index c84eeefdc9..89b6e7fc1e 100755
--- a/t/t3510-cherry-pick-sequence.sh
+++ b/t/t3510-cherry-pick-sequence.sh
@@ -390,10 +390,10 @@ test_expect_success '--continue respects opts' '
        git cat-file commit HEAD~1 >picked_msg &&
        git cat-file commit HEAD~2 >unrelatedpick_msg &&
        git cat-file commit HEAD~3 >initial_msg &&
-       ! grep "cherry picked from" initial_msg &&
-       grep "cherry picked from" unrelatedpick_msg &&
-       grep "cherry picked from" picked_msg &&
-       grep "cherry picked from" anotherpick_msg
+       ! grep "Cherry-Pick:" initial_msg &&
+       grep "Cherry-Pick: " unrelatedpick_msg &&
+       grep "Cherry-Pick: " picked_msg &&
+       grep "Cherry-Pick: " anotherpick_msg
 '
 
 test_expect_success '--continue of single-pick respects -x' '
@@ -404,7 +404,7 @@ test_expect_success '--continue of single-pick respects -x' 
'
        git cherry-pick --continue &&
        test_path_is_missing .git/sequencer &&
        git cat-file commit HEAD >msg &&
-       grep "cherry picked from" msg
+       grep "Cherry-Pick:" msg
 '
 
 test_expect_success '--continue respects -x in first commit in multi-pick' '
@@ -416,7 +416,7 @@ test_expect_success '--continue respects -x in first commit 
in multi-pick' '
        test_path_is_missing .git/sequencer &&
        git cat-file commit HEAD^ >msg &&
        picked=$(git rev-parse --verify picked) &&
-       grep "cherry picked from.*$picked" msg
+       grep "Cherry-Pick: $picked" msg
 '
 
 test_expect_failure '--signoff is automatically propagated to resolved 
conflict' '
diff --git a/t/t3511-cherry-pick-x.sh b/t/t3511-cherry-pick-x.sh
index 9888bf34b9..db11dd2430 100755
--- a/t/t3511-cherry-pick-x.sh
+++ b/t/t3511-cherry-pick-x.sh
@@ -32,7 +32,7 @@ mesg_with_footer_sob="$mesg_with_footer
 Signed-off-by: $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>"
 
 mesg_with_cherry_footer="$mesg_with_footer_sob
-(cherry picked from commit da39a3ee5e6b4b0d3255bfef95601890afd80709)
+Cherry-Pick: da39a3ee5e6b4b0d3255bfef95601890afd80709
 Tested-by: C.U. Thor <cut...@example.com>"
 
 mesg_unclean="$mesg_one_line
@@ -81,7 +81,7 @@ test_expect_success 'cherry-pick -x inserts blank line after 
one line subject' '
        cat <<-EOF >expect &&
                $mesg_one_line
 
-               (cherry picked from commit $sha1)
+               Cherry-Pick: $sha1
        EOF
        git log -1 --pretty=format:%B >actual &&
        test_cmp expect actual
@@ -129,7 +129,7 @@ test_expect_success 'cherry-pick -x inserts blank line when 
conforming footer no
        cat <<-EOF >expect &&
                $mesg_no_footer
 
-               (cherry picked from commit $sha1)
+               Cherry-Pick: $sha1
        EOF
        git log -1 --pretty=format:%B >actual &&
        test_cmp expect actual
@@ -154,7 +154,7 @@ test_expect_success 'cherry-pick -x -s inserts blank line 
when conforming footer
        cat <<-EOF >expect &&
                $mesg_no_footer
 
-               (cherry picked from commit $sha1)
+               Cherry-Pick: $sha1
                Signed-off-by: $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>
        EOF
        git log -1 --pretty=format:%B >actual &&
@@ -178,7 +178,7 @@ test_expect_success 'cherry-pick -x -s adds sob when last 
sob doesnt match commi
        git cherry-pick -x -s mesg-with-footer &&
        cat <<-EOF >expect &&
                $mesg_with_footer
-               (cherry picked from commit $sha1)
+               Cherry-Pick: $sha1
                Signed-off-by: $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>
        EOF
        git log -1 --pretty=format:%B >actual &&
@@ -201,7 +201,7 @@ test_expect_success 'cherry-pick -x -s adds sob even when 
trailing sob exists fo
        git cherry-pick -x -s mesg-with-footer-sob &&
        cat <<-EOF >expect &&
                $mesg_with_footer_sob
-               (cherry picked from commit $sha1)
+               Cherry-Pick: $sha1
                Signed-off-by: $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>
        EOF
        git log -1 --pretty=format:%B >actual &&
@@ -215,7 +215,7 @@ test_expect_success 'cherry-pick -x handles commits with no 
NL at end of message
        git cherry-pick -x $sha1 &&
        git log -1 --pretty=format:%B >actual &&
 
-       printf "\n(cherry picked from commit %s)\n" $sha1 >>msg &&
+       printf "\nCherry-Pick: %s\n" $sha1 >>msg &&
        test_cmp msg actual
 '
 
@@ -226,7 +226,7 @@ test_expect_success 'cherry-pick -x handles commits with no 
footer and no NL at
        git cherry-pick -x $sha1 &&
        git log -1 --pretty=format:%B >actual &&
 
-       printf "\n\n(cherry picked from commit %s)\n" $sha1 >>msg &&
+       printf "\n\nCherry-Pick: %s\n" $sha1 >>msg &&
        test_cmp msg actual
 '
 
@@ -252,19 +252,19 @@ test_expect_success 'cherry-pick -s handles commits with 
no footer and no NL at
        test_cmp msg actual
 '
 
-test_expect_success 'cherry-pick -x treats "(cherry picked from..." line as 
part of footer' '
+test_expect_success 'cherry-pick -x treats "Cherry-Pick:" line as part of 
footer' '
        pristine_detach initial &&
        sha1=$(git rev-parse mesg-with-cherry-footer^0) &&
        git cherry-pick -x mesg-with-cherry-footer &&
        cat <<-EOF >expect &&
                $mesg_with_cherry_footer
-               (cherry picked from commit $sha1)
+               Cherry-Pick: $sha1
        EOF
        git log -1 --pretty=format:%B >actual &&
        test_cmp expect actual
 '
 
-test_expect_success 'cherry-pick -s treats "(cherry picked from..." line as 
part of footer' '
+test_expect_success 'cherry-pick -s treats "Cherry-Pick:" line as part of 
footer' '
        pristine_detach initial &&
        git cherry-pick -s mesg-with-cherry-footer &&
        cat <<-EOF >expect &&
@@ -275,13 +275,13 @@ test_expect_success 'cherry-pick -s treats "(cherry 
picked from..." line as part
        test_cmp expect actual
 '
 
-test_expect_success 'cherry-pick -x -s treats "(cherry picked from..." line as 
part of footer' '
+test_expect_success 'cherry-pick -x -s treats "Cherry-Pick:..." line as part 
of footer' '
        pristine_detach initial &&
        sha1=$(git rev-parse mesg-with-cherry-footer^0) &&
        git cherry-pick -x -s mesg-with-cherry-footer &&
        cat <<-EOF >expect &&
                $mesg_with_cherry_footer
-               (cherry picked from commit $sha1)
+               Cherry-Pick: $sha1
                Signed-off-by: $GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>
        EOF
        git log -1 --pretty=format:%B >actual &&
-- 
2.19.1.1005.gac84295441

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