When calling `git rebase -i -v`, the user wants to see some statistics
after the commits were rebased. Let's show some.

The strbuf we use to perform that task will be used for other things
in subsequent commits, hence it is declared and initialized in a wider
scope than strictly needed here.

Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---
 sequencer.c | 22 ++++++++++++++++++++++
 sequencer.h |  1 +
 2 files changed, 23 insertions(+)

diff --git a/sequencer.c b/sequencer.c
index a58bb91..95c31bb 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -63,6 +63,8 @@ static GIT_PATH_FUNC(rebase_path_stopped_sha, 
"rebase-merge/stopped-sha")
  * command-line (and are only consumed, not modified, by the sequencer).
  */
 static GIT_PATH_FUNC(rebase_path_gpg_sign_opt, "rebase-merge/gpg_sign_opt")
+static GIT_PATH_FUNC(rebase_path_orig_head, "rebase-merge/orig-head")
+static GIT_PATH_FUNC(rebase_path_verbose, "rebase-merge/verbose")
 
 /* We will introduce the 'interactive rebase' mode later */
 static inline int is_rebase_i(const struct replay_opts *opts)
@@ -1096,6 +1098,9 @@ static int read_populate_opts(struct replay_opts *opts)
                        }
                }
 
+               if (file_exists(rebase_path_verbose()))
+                       opts->verbose = 1;
+
                return 0;
        }
 
@@ -1468,9 +1473,26 @@ static int pick_commits(struct todo_list *todo_list, 
struct replay_opts *opts)
        }
 
        if (is_rebase_i(opts)) {
+               struct strbuf buf = STRBUF_INIT;
+
                /* Stopped in the middle, as planned? */
                if (todo_list->current < todo_list->nr)
                        return 0;
+
+               if (opts->verbose) {
+                       const char *argv[] = {
+                               "diff-tree", "--stat", NULL, NULL
+                       };
+
+                       if (!read_oneliner(&buf, rebase_path_orig_head(), 0))
+                               return error("Could not read %s",
+                                       rebase_path_orig_head());
+                       strbuf_addstr(&buf, "..HEAD");
+                       argv[2] = buf.buf;
+                       run_command_v_opt(argv, RUN_GIT_CMD);
+                       strbuf_reset(&buf);
+               }
+               strbuf_release(&buf);
        }
 
        /*
diff --git a/sequencer.h b/sequencer.h
index edd7d4a..fd2a719 100644
--- a/sequencer.h
+++ b/sequencer.h
@@ -24,6 +24,7 @@ struct replay_opts {
        int allow_empty;
        int allow_empty_message;
        int keep_redundant_commits;
+       int verbose;
 
        int mainline;
 
-- 
2.10.0.rc2.102.g5c102ec


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