It is useful to see the full patch while resolving conflicts in a
rebase. The only way to do it now is

    less .git/rebase-*/patch

which could turn out to be a lot longer to type if you are in a
linked worktree, or not at top-dir. On top of that, an ordinary user
should not need to peek into .git directory. The new option is
provided to examine the patch.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 Documentation/git-rebase.txt           |  6 ++++-
 builtin/am.c                           | 11 +++++++++
 contrib/completion/git-completion.bash |  4 ++--
 git-rebase--am.sh                      |  3 +++
 git-rebase--interactive.sh             |  3 +++
 git-rebase--merge.sh                   |  3 +++
 git-rebase.sh                          |  7 +++++-
 t/t3400-rebase.sh                      | 33 ++++++++++++++++++++++++++
 t/t3404-rebase-interactive.sh          |  5 ++++
 9 files changed, 71 insertions(+), 4 deletions(-)

diff --git a/Documentation/git-rebase.txt b/Documentation/git-rebase.txt
index 8a861c1e0d..7ef9577472 100644
--- a/Documentation/git-rebase.txt
+++ b/Documentation/git-rebase.txt
@@ -12,7 +12,7 @@ SYNOPSIS
        [<upstream> [<branch>]]
 'git rebase' [-i | --interactive] [options] [--exec <cmd>] [--onto <newbase>]
        --root [<branch>]
-'git rebase' --continue | --skip | --abort | --quit | --edit-todo
+'git rebase' --continue | --skip | --abort | --quit | --edit-todo | 
--show-current-patch
 
 DESCRIPTION
 -----------
@@ -250,6 +250,10 @@ leave out at most one of A and B, in which case it 
defaults to HEAD.
 --edit-todo::
        Edit the todo list during an interactive rebase.
 
+--show-current-patch::
+       Show the current patch in an interactive rebase or when rebase
+       is stopped because of conflicts.
+
 -m::
 --merge::
        Use merging strategies to rebase.  When the recursive (default) merge
diff --git a/builtin/am.c b/builtin/am.c
index 5eff1a648d..caec50cba9 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -2125,6 +2125,17 @@ static int show_patch(struct am_state *state)
        struct strbuf sb = STRBUF_INIT;
        int len;
 
+       if (!is_null_oid(&state->orig_commit)) {
+               const char *av[4] = { "show", NULL, "--", NULL };
+               char *new_oid_str;
+               int ret;
+
+               av[1] = new_oid_str = xstrdup(oid_to_hex(&state->orig_commit));
+               ret = run_command_v_opt(av, RUN_GIT_CMD);
+               free(new_oid_str);
+               return ret;
+       }
+
        len = strbuf_read_file(&sb, am_path(state, msgnum(state)), 0);
        if (len < 0)
                die_errno(_("failed to read '%s'"),
diff --git a/contrib/completion/git-completion.bash 
b/contrib/completion/git-completion.bash
index 56ca445fa8..2bd30d68cf 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -1992,11 +1992,11 @@ _git_rebase ()
 {
        __git_find_repo_path
        if [ -f "$__git_repo_path"/rebase-merge/interactive ]; then
-               __gitcomp "--continue --skip --abort --quit --edit-todo"
+               __gitcomp "--continue --skip --abort --quit --edit-todo 
--show-current-patch"
                return
        elif [ -d "$__git_repo_path"/rebase-apply ] || \
             [ -d "$__git_repo_path"/rebase-merge ]; then
-               __gitcomp "--continue --skip --abort --quit"
+               __gitcomp "--continue --skip --abort --quit 
--show-current-patch"
                return
        fi
        __git_complete_strategy && return
diff --git a/git-rebase--am.sh b/git-rebase--am.sh
index 14c50782e0..c931891cbc 100644
--- a/git-rebase--am.sh
+++ b/git-rebase--am.sh
@@ -27,6 +27,9 @@ skip)
        move_to_original_branch
        return
        ;;
+show-current-patch)
+       exec git am --show-current-patch
+       ;;
 esac
 
 if test -z "$rebase_root"
diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index d47bd29593..0c0f8abbf9 100644
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -840,6 +840,9 @@ To continue rebase after editing, run:
 
        exit
        ;;
+show-current-patch)
+       exec git show "$(cat "$state_dir/stopped-sha")" --
+       ;;
 esac
 
 comment_for_reflog start
diff --git a/git-rebase--merge.sh b/git-rebase--merge.sh
index 06a4723d4d..0a96dfae37 100644
--- a/git-rebase--merge.sh
+++ b/git-rebase--merge.sh
@@ -137,6 +137,9 @@ skip)
        finish_rb_merge
        return
        ;;
+show-current-patch)
+       exec git show "$(cat "$state_dir/current")" --
+       ;;
 esac
 
 mkdir -p "$state_dir"
diff --git a/git-rebase.sh b/git-rebase.sh
index fd72a35c65..41c915d18c 100755
--- a/git-rebase.sh
+++ b/git-rebase.sh
@@ -45,6 +45,7 @@ abort!             abort and check out the original branch
 skip!              skip current patch and continue
 edit-todo!         edit the todo list during an interactive rebase
 quit!              abort but keep HEAD where it is
+show-current-patch! show the patch file being applied or merged
 "
 . git-sh-setup
 set_reflog_action rebase
@@ -245,7 +246,7 @@ do
        --verify)
                ok_to_skip_pre_rebase=
                ;;
-       --continue|--skip|--abort|--quit|--edit-todo)
+       --continue|--skip|--abort|--quit|--edit-todo|--show-current-patch)
                test $total_argc -eq 2 || usage
                action=${1##--}
                ;;
@@ -412,6 +413,10 @@ quit)
 edit-todo)
        run_specific_rebase
        ;;
+show-current-patch)
+       run_specific_rebase
+       die "BUG: run_specific_rebase is not supposed to return here"
+       ;;
 esac
 
 # Make sure no rebase is in progress
diff --git a/t/t3400-rebase.sh b/t/t3400-rebase.sh
index 8ac58d5ea5..09943d6a9b 100755
--- a/t/t3400-rebase.sh
+++ b/t/t3400-rebase.sh
@@ -277,4 +277,37 @@ EOF
        test_cmp From_.msg out
 '
 
+test_expect_success 'rebase--am.sh and --show-current-patch' '
+       test_create_repo conflict-apply &&
+       (
+               cd conflict-apply &&
+               test_commit init &&
+               echo one >>init.t &&
+               git commit -a -m one &&
+               echo two >>init.t &&
+               git commit -a -m two &&
+               git tag two &&
+               test_must_fail git rebase --onto init HEAD^ &&
+               GIT_TRACE=1 git rebase --show-current-patch >/dev/null 2>stderr 
&&
+               grep "show.*$(git rev-parse two)" stderr
+       )
+'
+
+test_expect_success 'rebase--merge.sh and --show-current-patch' '
+       test_create_repo conflict-merge &&
+       (
+               cd conflict-merge &&
+               test_commit init &&
+               echo one >>init.t &&
+               git commit -a -m one &&
+               echo two >>init.t &&
+               git commit -a -m two &&
+               git tag two &&
+               test_must_fail git rebase --merge --onto init HEAD^ &&
+               git rebase --show-current-patch >actual.patch &&
+               GIT_TRACE=1 git rebase --show-current-patch >/dev/null 2>stderr 
&&
+               grep "show.*$(git rev-parse two)" stderr
+       )
+'
+
 test_done
diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index 481a350090..3af6f149a9 100755
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh
@@ -225,6 +225,11 @@ test_expect_success 'stop on conflicting pick' '
        test 0 = $(grep -c "^[^#]" < .git/rebase-merge/git-rebase-todo)
 '
 
+test_expect_success 'show conflicted patch' '
+       GIT_TRACE=1 git rebase --show-current-patch >/dev/null 2>stderr &&
+       grep "show.*$(cat "$state_dir/stopped-sha")" stderr
+'
+
 test_expect_success 'abort' '
        git rebase --abort &&
        test $(git rev-parse new-branch1) = $(git rev-parse HEAD) &&
-- 
2.16.1.205.g271f633410

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