Merge branch 'js/rebase'

* js/rebase:
  Teach rebase -i about --preserve-merges
  rebase -i: provide reasonable reflog for the rebased branch
  rebase -i: several cleanups
  ignore git-rebase--interactive
  Teach rebase an interactive mode
  Move the pick_author code to git-sh-setup

t/t3404-rebase-interactive.sh

@@ -0,0 +1,191 @@
+#!/bin/sh
+#
+# Copyright (c) 2007 Johannes E. Schindelin
+#
+
+test_description='git rebase interactive
+
+This test runs git rebase "interactively", by faking an edit, and verifies
+that the result still makes sense.
+'
+. ./test-lib.sh
+
+# set up two branches like this:
+#
+# A - B - C - D - E
+#   \
+#     F - G - H
+#       \
+#         I
+#
+# where B, D and G touch the same file.
+
+test_expect_success 'setup' '
+	: > file1 &&
+	git add file1 &&
+	test_tick &&
+	git commit -m A &&
+	git tag A &&
+	echo 1 > file1 &&
+	test_tick &&
+	git commit -m B file1 &&
+	: > file2 &&
+	git add file2 &&
+	test_tick &&
+	git commit -m C &&
+	echo 2 > file1 &&
+	test_tick &&
+	git commit -m D file1 &&
+	: > file3 &&
+	git add file3 &&
+	test_tick &&
+	git commit -m E &&
+	git checkout -b branch1 A &&
+	: > file4 &&
+	git add file4 &&
+	test_tick &&
+	git commit -m F &&
+	git tag F &&
+	echo 3 > file1 &&
+	test_tick &&
+	git commit -m G file1 &&
+	: > file5 &&
+	git add file5 &&
+	test_tick &&
+	git commit -m H &&
+	git checkout -b branch2 F &&
+	: > file6 &&
+	git add file6 &&
+	test_tick &&
+	git commit -m I &&
+	git tag I
+'
+
+cat > fake-editor.sh << EOF
+#!/bin/sh
+test "\$1" = .git/COMMIT_EDITMSG && exit
+test -z "\$FAKE_LINES" && exit
+grep -v "^#" < "\$1" > "\$1".tmp
+rm "\$1"
+cat "\$1".tmp
+action=pick
+for line in \$FAKE_LINES; do
+	case \$line in
+	squash)
+		action="\$line";;
+	*)
+		echo sed -n "\${line}s/^pick/\$action/p"
+		sed -n "\${line}p" < "\$1".tmp
+		sed -n "\${line}s/^pick/\$action/p" < "\$1".tmp >> "\$1"
+		action=pick;;
+	esac
+done
+EOF
+
+chmod a+x fake-editor.sh
+VISUAL="$(pwd)/fake-editor.sh"
+export VISUAL
+
+test_expect_success 'no changes are a nop' '
+	git rebase -i F &&
+	test $(git rev-parse I) = $(git rev-parse HEAD)
+'
+
+test_expect_success 'rebase on top of a non-conflicting commit' '
+	git checkout branch1 &&
+	git tag original-branch1 &&
+	git rebase -i branch2 &&
+	test file6 = $(git diff --name-only original-branch1) &&
+	test $(git rev-parse I) = $(git rev-parse HEAD~2)
+'
+
+test_expect_success 'reflog for the branch shows state before rebase' '
+	test $(git rev-parse branch1@{1}) = $(git rev-parse original-branch1)
+'
+
+test_expect_success 'exchange two commits' '
+	FAKE_LINES="2 1" git rebase -i HEAD~2 &&
+	test H = $(git cat-file commit HEAD^ | tail -n 1) &&
+	test G = $(git cat-file commit HEAD | tail -n 1)
+'
+
+cat > expect << EOF
+diff --git a/file1 b/file1
+index e69de29..00750ed 100644
+--- a/file1
++++ b/file1
+@@ -0,0 +1 @@
++3
+EOF
+
+cat > expect2 << EOF
+<<<<<<< HEAD:file1
+2
+=======
+3
+>>>>>>> b7ca976... G:file1
+EOF
+
+test_expect_success 'stop on conflicting pick' '
+	git tag new-branch1 &&
+	! git rebase -i master &&
+	diff -u expect .git/.dotest-merge/patch &&
+	diff -u expect2 file1 &&
+	test 4 = $(grep -v "^#" < .git/.dotest-merge/done | wc -l) &&
+	test 0 = $(grep -v "^#" < .git/.dotest-merge/todo | wc -l)
+'
+
+test_expect_success 'abort' '
+	git rebase --abort &&
+	test $(git rev-parse new-branch1) = $(git rev-parse HEAD) &&
+	! test -d .git/.dotest-merge
+'
+
+test_expect_success 'retain authorship' '
+	echo A > file7 &&
+	git add file7 &&
+	test_tick &&
+	GIT_AUTHOR_NAME="Twerp Snog" git commit -m "different author" &&
+	git tag twerp &&
+	git rebase -i --onto master HEAD^ &&
+	git show HEAD | grep "^Author: Twerp Snog"
+'
+
+test_expect_success 'squash' '
+	git reset --hard twerp &&
+	echo B > file7 &&
+	test_tick &&
+	GIT_AUTHOR_NAME="Nitfol" git commit -m "nitfol" file7 &&
+	echo "******************************" &&
+	FAKE_LINES="1 squash 2" git rebase -i --onto master HEAD~2 &&
+	test B = $(cat file7) &&
+	test $(git rev-parse HEAD^) = $(git rev-parse master)
+'
+
+test_expect_success 'retain authorship when squashing' '
+	git show HEAD | grep "^Author: Nitfol"
+'
+
+test_expect_success 'preserve merges with -p' '
+	git checkout -b to-be-preserved master^ &&
+	: > unrelated-file &&
+	git add unrelated-file &&
+	test_tick &&
+	git commit -m "unrelated" &&
+	git checkout -b to-be-rebased master &&
+	echo B > file1 &&
+	test_tick &&
+	git commit -m J file1 &&
+	test_tick &&
+	git merge to-be-preserved &&
+	echo C > file1 &&
+	test_tick &&
+	git commit -m K file1 &&
+	git rebase -i -p --onto branch1 master &&
+	test $(git rev-parse HEAD^^2) = $(git rev-parse to-be-preserved) &&
+	test $(git rev-parse HEAD~3) = $(git rev-parse branch1) &&
+	test $(git show HEAD:file1) = C &&
+	test $(git show HEAD~2:file1) = B
+'
+
+test_done