#!/bin/sh
#
# Copyright (c) 2007 Lars Hjemli
#

test_description='git merge

Testing basic merge operations/option parsing.

! [c0] commit 0
 ! [c1] commit 1
  ! [c2] commit 2
   ! [c3] commit 3
    ! [c4] c4
     ! [c5] c5
      ! [c6] c6
       * [master] Merge commit 'c1'
--------
       - [master] Merge commit 'c1'
 +     * [c1] commit 1
      +  [c6] c6
     +   [c5] c5
    ++   [c4] c4
   ++++  [c3] commit 3
  +      [c2] commit 2
+++++++* [c0] commit 0
'

. ./test-lib.sh

test_expect_success 'set up test data and helpers' '
	printf "%s\n" 1 2 3 4 5 6 7 8 9 >file &&
	printf "%s\n" "1 X" 2 3 4 5 6 7 8 9 >file.1 &&
	printf "%s\n" 1 2 3 4 "5 X" 6 7 8 9 >file.5 &&
	printf "%s\n" 1 2 3 4 5 6 7 8 "9 X" >file.9 &&
	printf "%s\n" "1 X" 2 3 4 5 6 7 8 9 >result.1 &&
	printf "%s\n" "1 X" 2 3 4 "5 X" 6 7 8 9 >result.1-5 &&
	printf "%s\n" "1 X" 2 3 4 "5 X" 6 7 8 "9 X" >result.1-5-9 &&

	create_merge_msgs() {
		echo "Merge commit '\''c2'\''" >msg.1-5 &&
		echo "Merge commit '\''c2'\''; commit '\''c3'\''" >msg.1-5-9 &&
		{
			echo "Squashed commit of the following:" &&
			echo &&
			git log --no-merges ^HEAD c1
		} >squash.1 &&
		{
			echo "Squashed commit of the following:" &&
			echo &&
			git log --no-merges ^HEAD c2
		} >squash.1-5 &&
		{
			echo "Squashed commit of the following:" &&
			echo &&
			git log --no-merges ^HEAD c2 c3
		} >squash.1-5-9 &&
		echo >msg.nolog &&
		{
			echo "* commit '\''c3'\'':" &&
			echo "  commit 3" &&
			echo
		} >msg.log
	} &&

	verify_merge() {
		test_cmp "$2" "$1" &&
		git update-index --refresh &&
		git diff --exit-code &&
		if test -n "$3"
		then
			git show -s --pretty=format:%s HEAD >msg.act &&
			test_cmp "$3" msg.act
		fi
	} &&

	verify_head() {
		echo "$1" >head.expected &&
		git rev-parse HEAD >head.actual &&
		test_cmp head.expected head.actual
	} &&

	verify_parents() {
		printf "%s\n" "$@" >parents.expected &&
		>parents.actual &&
		i=1 &&
		while test $i -le $#
		do
			git rev-parse HEAD^$i >>parents.actual &&
			i=$(expr $i + 1) ||
			return 1
		done &&
		test_cmp parents.expected parents.actual
	} &&

	verify_mergeheads() {
		printf "%s\n" "$@" >mergehead.expected &&
		test_cmp mergehead.expected .git/MERGE_HEAD
	} &&

	verify_no_mergehead() {
		! test -e .git/MERGE_HEAD
	}
'

test_expect_success 'setup' '
	git add file &&
	test_tick &&
	git commit -m "commit 0" &&
	git tag c0 &&
	c0=$(git rev-parse HEAD) &&
	cp file.1 file &&
	git add file &&
	test_tick &&
	git commit -m "commit 1" &&
	git tag c1 &&
	c1=$(git rev-parse HEAD) &&
	git reset --hard "$c0" &&
	cp file.5 file &&
	git add file &&
	test_tick &&
	git commit -m "commit 2" &&
	git tag c2 &&
	c2=$(git rev-parse HEAD) &&
	git reset --hard "$c0" &&
	cp file.9 file &&
	git add file &&
	test_tick &&
	git commit -m "commit 3" &&
	git tag c3 &&
	c3=$(git rev-parse HEAD)
	git reset --hard "$c0" &&
	create_merge_msgs
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'test option parsing' '
	test_must_fail git merge -$ c1 &&
	test_must_fail git merge --no-such c1 &&
	test_must_fail git merge -s foobar c1 &&
	test_must_fail git merge -s=foobar c1 &&
	test_must_fail git merge -m &&
	test_must_fail git merge
'

test_expect_success 'reject non-strategy with a git-merge-foo name' '
	test_must_fail git merge -s index c1
'

test_expect_success 'merge c0 with c1' '
	echo "OBJID HEAD@{0}: merge c1: Fast-forward" >reflog.expected &&

	git reset --hard c0 &&
	git merge c1 &&
	verify_merge file result.1 &&
	verify_head "$c1" &&

	git reflog -1 >reflog.actual &&
	sed "s/$_x05[0-9a-f]*/OBJID/g" reflog.actual >reflog.fuzzy &&
	test_cmp reflog.expected reflog.fuzzy
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c0 with c1 with --ff-only' '
	git reset --hard c0 &&
	git merge --ff-only c1 &&
	git merge --ff-only HEAD c0 c1 &&
	verify_merge file result.1 &&
	verify_head "$c1"
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge from unborn branch' '
	git checkout -f master &&
	test_might_fail git branch -D kid &&

	echo "OBJID HEAD@{0}: initial pull" >reflog.expected &&

	git checkout --orphan kid &&
	test_when_finished "git checkout -f master" &&
	git rm -fr . &&
	test_tick &&
	git merge --ff-only c1 &&
	verify_merge file result.1 &&
	verify_head "$c1" &&

	git reflog -1 >reflog.actual &&
	sed "s/$_x05[0-9a-f][0-9a-f]/OBJID/g" reflog.actual >reflog.fuzzy &&
	test_cmp reflog.expected reflog.fuzzy
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c1 with c2' '
	git reset --hard c1 &&
	test_tick &&
	git merge c2 &&
	verify_merge file result.1-5 msg.1-5 &&
	verify_parents $c1 $c2
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c1 with c2 and c3' '
	git reset --hard c1 &&
	test_tick &&
	git merge c2 c3 &&
	verify_merge file result.1-5-9 msg.1-5-9 &&
	verify_parents $c1 $c2 $c3
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'failing merges with --ff-only' '
	git reset --hard c1 &&
	test_tick &&
	test_must_fail git merge --ff-only c2 &&
	test_must_fail git merge --ff-only c3 &&
	test_must_fail git merge --ff-only c2 c3
'

test_expect_success 'merge c0 with c1 (no-commit)' '
	git reset --hard c0 &&
	git merge --no-commit c1 &&
	verify_merge file result.1 &&
	verify_head $c1
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c1 with c2 (no-commit)' '
	git reset --hard c1 &&
	git merge --no-commit c2 &&
	verify_merge file result.1-5 &&
	verify_head $c1 &&
	verify_mergeheads $c2
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c1 with c2 and c3 (no-commit)' '
	git reset --hard c1 &&
	git merge --no-commit c2 c3 &&
	verify_merge file result.1-5-9 &&
	verify_head $c1 &&
	verify_mergeheads $c2 $c3
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c0 with c1 (squash)' '
	git reset --hard c0 &&
	git merge --squash c1 &&
	verify_merge file result.1 &&
	verify_head $c0 &&
	verify_no_mergehead &&
	test_cmp squash.1 .git/SQUASH_MSG
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c0 with c1 (squash, ff-only)' '
	git reset --hard c0 &&
	git merge --squash --ff-only c1 &&
	verify_merge file result.1 &&
	verify_head $c0 &&
	verify_no_mergehead &&
	test_cmp squash.1 .git/SQUASH_MSG
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c1 with c2 (squash)' '
	git reset --hard c1 &&
	git merge --squash c2 &&
	verify_merge file result.1-5 &&
	verify_head $c1 &&
	verify_no_mergehead &&
	test_cmp squash.1-5 .git/SQUASH_MSG
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'unsuccesful merge of c1 with c2 (squash, ff-only)' '
	git reset --hard c1 &&
	test_must_fail git merge --squash --ff-only c2
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c1 with c2 and c3 (squash)' '
	git reset --hard c1 &&
	git merge --squash c2 c3 &&
	verify_merge file result.1-5-9 &&
	verify_head $c1 &&
	verify_no_mergehead &&
	test_cmp squash.1-5-9 .git/SQUASH_MSG
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c1 with c2 (no-commit in config)' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "--no-commit" &&
	git merge c2 &&
	verify_merge file result.1-5 &&
	verify_head $c1 &&
	verify_mergeheads $c2
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c1 with c2 (squash in config)' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "--squash" &&
	git merge c2 &&
	verify_merge file result.1-5 &&
	verify_head $c1 &&
	verify_no_mergehead &&
	test_cmp squash.1-5 .git/SQUASH_MSG
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'override config option -n with --summary' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "-n" &&
	test_tick &&
	git merge --summary c2 >diffstat.txt &&
	verify_merge file result.1-5 msg.1-5 &&
	verify_parents $c1 $c2 &&
	if ! grep "^ file |  *2 +-$" diffstat.txt
	then
		echo "[OOPS] diffstat was not generated with --summary"
		false
	fi
'

test_expect_success 'override config option -n with --stat' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "-n" &&
	test_tick &&
	git merge --stat c2 >diffstat.txt &&
	verify_merge file result.1-5 msg.1-5 &&
	verify_parents $c1 $c2 &&
	if ! grep "^ file |  *2 +-$" diffstat.txt
	then
		echo "[OOPS] diffstat was not generated with --stat"
		false
	fi
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'override config option --stat' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "--stat" &&
	test_tick &&
	git merge -n c2 >diffstat.txt &&
	verify_merge file result.1-5 msg.1-5 &&
	verify_parents $c1 $c2 &&
	if grep "^ file |  *2 +-$" diffstat.txt
	then
		echo "[OOPS] diffstat was generated"
		false
	fi
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c1 with c2 (override --no-commit)' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "--no-commit" &&
	test_tick &&
	git merge --commit c2 &&
	verify_merge file result.1-5 msg.1-5 &&
	verify_parents $c1 $c2
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c1 with c2 (override --squash)' '
	git reset --hard c1 &&
	git config branch.master.mergeoptions "--squash" &&
	test_tick &&
	git merge --no-squash c2 &&
	verify_merge file result.1-5 msg.1-5 &&
	verify_parents $c1 $c2
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c0 with c1 (no-ff)' '
	git reset --hard c0 &&
	git config branch.master.mergeoptions "" &&
	test_tick &&
	git merge --no-ff c1 &&
	verify_merge file result.1 &&
	verify_parents $c0 $c1
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'combining --squash and --no-ff is refused' '
	test_must_fail git merge --squash --no-ff c1 &&
	test_must_fail git merge --no-ff --squash c1
'

test_expect_success 'combining --ff-only and --no-ff is refused' '
	test_must_fail git merge --ff-only --no-ff c1 &&
	test_must_fail git merge --no-ff --ff-only c1
'

test_expect_success 'merge c0 with c1 (ff overrides no-ff)' '
	git reset --hard c0 &&
	git config branch.master.mergeoptions "--no-ff" &&
	git merge --ff c1 &&
	verify_merge file result.1 &&
	verify_head $c1
'

test_expect_success 'merge log message' '
	git reset --hard c0 &&
	git merge --no-log c2 &&
	git show -s --pretty=format:%b HEAD >msg.act &&
	test_cmp msg.nolog msg.act &&

	git merge --log c3 &&
	git show -s --pretty=format:%b HEAD >msg.act &&
	test_cmp msg.log msg.act &&

	git reset --hard HEAD^ &&
	git config merge.log yes &&
	git merge c3 &&
	git show -s --pretty=format:%b HEAD >msg.act &&
	test_cmp msg.log msg.act
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c1 with c0, c2, c0, and c1' '
       git reset --hard c1 &&
       git config branch.master.mergeoptions "" &&
       test_tick &&
       git merge c0 c2 c0 c1 &&
       verify_merge file result.1-5 &&
       verify_parents $c1 $c2
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c1 with c0, c2, c0, and c1' '
       git reset --hard c1 &&
       git config branch.master.mergeoptions "" &&
       test_tick &&
       git merge c0 c2 c0 c1 &&
       verify_merge file result.1-5 &&
       verify_parents $c1 $c2
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge c1 with c1 and c2' '
       git reset --hard c1 &&
       git config branch.master.mergeoptions "" &&
       test_tick &&
       git merge c1 c2 &&
       verify_merge file result.1-5 &&
       verify_parents $c1 $c2
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge fast-forward in a dirty tree' '
       git reset --hard c0 &&
       mv file file1 &&
       cat file1 >file &&
       rm -f file1 &&
       git merge c2
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'in-index merge' '
	git reset --hard c0 &&
	git merge --no-ff -s resolve c1 >out &&
	grep "Wonderful." out &&
	verify_parents $c0 $c1
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'refresh the index before merging' '
	git reset --hard c1 &&
	cp file file.n && mv -f file.n file &&
	git merge c3
'

cat >expected.branch <<\EOF
Merge branch 'c5-branch' (early part)
EOF
cat >expected.tag <<\EOF
Merge commit 'c5~1'
EOF

test_expect_success 'merge early part of c2' '
	git reset --hard c3 &&
	echo c4 >c4.c &&
	git add c4.c &&
	git commit -m c4 &&
	git tag c4 &&
	echo c5 >c5.c &&
	git add c5.c &&
	git commit -m c5 &&
	git tag c5 &&
	git reset --hard c3 &&
	echo c6 >c6.c &&
	git add c6.c &&
	git commit -m c6 &&
	git tag c6 &&
	git branch -f c5-branch c5 &&
	git merge c5-branch~1 &&
	git show -s --pretty=format:%s HEAD >actual.branch &&
	git reset --keep HEAD^ &&
	git merge c5~1 &&
	git show -s --pretty=format:%s HEAD >actual.tag &&
	test_cmp expected.branch actual.branch &&
	test_cmp expected.tag actual.tag
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'merge --no-ff --no-commit && commit' '
	git reset --hard c0 &&
	git merge --no-ff --no-commit c1 &&
	EDITOR=: git commit &&
	verify_parents $c0 $c1
'

test_debug 'git log --graph --decorate --oneline --all'

test_expect_success 'amending no-ff merge commit' '
	EDITOR=: git commit --amend &&
	verify_parents $c0 $c1
'

test_debug 'git log --graph --decorate --oneline --all'

test_done