1 files changed, 65 insertions, 0 deletions
diff --git a/t/lib-rebase.sh b/t/lib-rebase.sh
new file mode 100644
index 0000000000..6aefe27593
--- /dev/null
+++ b/t/lib-rebase.sh
@@ -0,0 +1,65 @@
+#!/bin/sh
+
+# After setting the fake editor with this function, you can
+#
+# - override the commit message with $FAKE_COMMIT_MESSAGE
+# - amend the commit message with $FAKE_COMMIT_AMEND
+# - check that non-commit messages have a certain line count with $EXPECT_COUNT
+# - check the commit count in the commit message header with $EXPECT_HEADER_COUNT
+# - rewrite a rebase -i script as directed by $FAKE_LINES.
+#   $FAKE_LINES consists of a sequence of words separated by spaces.
+#   The following word combinations are possible:
+#
+#   "<lineno>" -- add a "pick" line with the SHA1 taken from the
+#       specified line.
+#
+#   "<cmd> <lineno>" -- add a line with the specified command
+#       ("squash", "fixup", "edit", or "reword") and the SHA1 taken
+#       from the specified line.
+#
+#   "#" -- Add a comment line.
+#
+#   ">" -- Add a blank line.
+
+set_fake_editor () {
+	echo "#!$SHELL_PATH" >fake-editor.sh
+	cat >> fake-editor.sh <<\EOF
+case "$1" in
+*/COMMIT_EDITMSG)
+	test -z "$EXPECT_HEADER_COUNT" ||
+		test "$EXPECT_HEADER_COUNT" = "$(sed -n '1s/^# This is a combination of \(.*\) commits\./\1/p' < "$1")" ||
+		exit
+	test -z "$FAKE_COMMIT_MESSAGE" || echo "$FAKE_COMMIT_MESSAGE" > "$1"
+	test -z "$FAKE_COMMIT_AMEND" || echo "$FAKE_COMMIT_AMEND" >> "$1"
+	exit
+	;;
+esac
+test -z "$EXPECT_COUNT" ||
+	test "$EXPECT_COUNT" = $(sed -e '/^#/d' -e '/^$/d' < "$1" | wc -l) ||
+	exit
+test -z "$FAKE_LINES" && exit
+grep -v '^#' < "$1" > "$1".tmp
+rm -f "$1"
+echo 'rebase -i script before editing:'
+cat "$1".tmp
+action=pick
+for line in $FAKE_LINES; do
+	case $line in
+	squash|fixup|edit|reword)
+		action="$line";;
+	"#")
+		echo '# comment' >> "$1";;
+	">")
+		echo >> "$1";;
+	*)
+		sed -n "${line}s/^pick/$action/p" < "$1".tmp >> "$1"
+		action=pick;;
+	esac
+done
+echo 'rebase -i script after editing:'
+cat "$1"
+EOF
+
+	test_set_editor "$(pwd)/fake-editor.sh"
+	chmod a+x fake-editor.sh
+}