From abc6924c3257feb8192ff4fed921525cb148ee34 Mon Sep 17 00:00:00 2001
From: Johannes Schindelin <johannes.schindelin@gmx.de>
Date: Tue, 12 Apr 2016 15:30:26 +0200
Subject: [PATCH] sequencer (rebase -i): learn about the 'verbose' mode

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.schindelin@gmx.de>
---
 sequencer.c | 28 ++++++++++++++++++++++++++++
 sequencer.h |  1 +
 2 files changed, 29 insertions(+)

diff --git a/sequencer.c b/sequencer.c
index 8a4418d655..e6895a76bb 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -64,6 +64,8 @@ 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")
 
 static inline int is_rebase_i(const struct replay_opts *opts)
 {
@@ -1135,6 +1137,9 @@ static int read_populate_opts(struct replay_opts *opts)
 		}
 		strbuf_release(&buf);
 
+		if (file_exists(rebase_path_verbose()))
+			opts->verbose = 1;
+
 		return 0;
 	}
 
@@ -1538,9 +1543,32 @@ 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) {
+			struct rev_info log_tree_opt;
+			struct object_id orig, head;
+
+			memset(&log_tree_opt, 0, sizeof(log_tree_opt));
+			init_revisions(&log_tree_opt, NULL);
+			log_tree_opt.diff = 1;
+			log_tree_opt.diffopt.output_format =
+				DIFF_FORMAT_DIFFSTAT;
+			log_tree_opt.disable_stdin = 1;
+
+			if (read_oneliner(&buf, rebase_path_orig_head(), 0) &&
+			    !get_sha1(buf.buf, orig.hash) &&
+			    !get_sha1("HEAD", head.hash)) {
+				diff_tree_sha1(orig.hash, head.hash,
+					       "", &log_tree_opt.diffopt);
+				log_tree_diff_flush(&log_tree_opt);
+			}
+		}
+		strbuf_release(&buf);
 	}
 
 	/*
diff --git a/sequencer.h b/sequencer.h
index cb21cfddee..f885b68395 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;