From 10d3235c46e6b271f59b4971ec8d466f552eacbb Mon Sep 17 00:00:00 2001
From: Johannes Schindelin <johannes.schindelin@gmx.de>
Date: Wed, 13 Apr 2016 14:11:12 +0200
Subject: [PATCH] sequencer (rebase -i): write an author-script file

When the interactive rebase aborts, it writes out an author-script file
to record the author information for the current commit. As we are about
to teach the sequencer how to perform the actions behind an interactive
rebase, it needs to write those author-script files, too.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 sequencer.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 50 insertions(+), 1 deletion(-)

diff --git a/sequencer.c b/sequencer.c
index 2d94092e72..734ce2aabd 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -515,6 +515,53 @@ static int is_index_unchanged(void)
 	return !hashcmp(active_cache_tree->sha1, head_commit->tree->object.oid.hash);
 }
 
+static int write_author_script(const char *message)
+{
+	struct strbuf buf = STRBUF_INIT;
+	const char *eol;
+	int res;
+
+	for (;;)
+		if (!*message || starts_with(message, "\n")) {
+missing_author:
+			/* Missing 'author' line? */
+			unlink(rebase_path_author_script());
+			return 0;
+		}
+		else if (skip_prefix(message, "author ", &message))
+			break;
+		else if ((eol = strchr(message, '\n')))
+			message = eol + 1;
+		else
+			goto missing_author;
+
+	strbuf_addstr(&buf, "GIT_AUTHOR_NAME='");
+	while (*message && *message != '\n' && *message != '\r')
+		if (skip_prefix(message, " <", &message))
+			break;
+		else if (*message != '\'')
+			strbuf_addch(&buf, *(message++));
+		else
+			strbuf_addf(&buf, "'\\\\%c'", *(message++));
+	strbuf_addstr(&buf, "'\nGIT_AUTHOR_EMAIL='");
+	while (*message && *message != '\n' && *message != '\r')
+		if (skip_prefix(message, "> ", &message))
+			break;
+		else if (*message != '\'')
+			strbuf_addch(&buf, *(message++));
+		else
+			strbuf_addf(&buf, "'\\\\%c'", *(message++));
+	strbuf_addstr(&buf, "'\nGIT_AUTHOR_DATE='@");
+	while (*message && *message != '\n' && *message != '\r')
+		if (*message != '\'')
+			strbuf_addch(&buf, *(message++));
+		else
+			strbuf_addf(&buf, "'\\\\%c'", *(message++));
+	res = write_message(buf.buf, buf.len, rebase_path_author_script(), 1);
+	strbuf_release(&buf);
+	return res;
+}
+
 /*
  * Read the author-script file into an environment block, ready for use in
  * run_command(), that can be free()d afterwards.
@@ -974,7 +1021,9 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
 		}
 	}
 
-	if (!opts->strategy || !strcmp(opts->strategy, "recursive") || command == TODO_REVERT) {
+	if (is_rebase_i(opts) && write_author_script(msg.message) < 0)
+		res = -1;
+	else if (!opts->strategy || !strcmp(opts->strategy, "recursive") || command == TODO_REVERT) {
 		res = do_recursive_merge(base, next, base_label, next_label,
 					 head, &msgbuf, opts);
 		if (res < 0)