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

test_description='git-merge

Testing basic merge operations/option parsing.'

. ./test-lib.sh

cat >file <<EOF
1
2
3
4
5
6
7
8
9
EOF

cat >file.1 <<EOF
1 X
2
3
4
5
6
7
8
9
EOF

cat >file.5 <<EOF
1
2
3
4
5 X
6
7
8
9
EOF

cat >file.9 <<EOF
1
2
3
4
5
6
7
8
9 X
EOF

cat  >result.1 <<EOF
1 X
2
3
4
5
6
7
8
9
EOF

cat >result.1-5 <<EOF
1 X
2
3
4
5 X
6
7
8
9
EOF

cat >result.1-5-9 <<EOF
1 X
2
3
4
5 X
6
7
8
9 X
EOF

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:" >squash.1 &&
        echo >>squash.1 &&
        git log --no-merges ^HEAD c1 >>squash.1 &&
        echo "Squashed commit of the following:" >squash.1-5 &&
        echo >>squash.1-5 &&
        git log --no-merges ^HEAD c2 >>squash.1-5 &&
        echo "Squashed commit of the following:" >squash.1-5-9 &&
        echo >>squash.1-5-9 &&
        git log --no-merges ^HEAD c2 c3 >>squash.1-5-9
}

verify_diff() {
        if ! diff -u "$1" "$2"
        then
                echo "$3"
                false
        fi
}

verify_merge() {
        verify_diff "$2" "$1" "[OOPS] bad merge result" &&
        if test $(git ls-files -u | wc -l) -gt 0
        then
                echo "[OOPS] unmerged files"
                false
        fi &&
        if ! git diff --exit-code
        then
                echo "[OOPS] working tree != index"
                false
        fi &&
        if test -n "$3"
        then
                git show -s --pretty=format:%s HEAD >msg.act &&
                verify_diff "$3" msg.act "[OOPS] bad merge message"
        fi
}

verify_head() {
        if test "$1" != "$(git rev-parse HEAD)"
        then
                echo "[OOPS] HEAD != $1"
                false
        fi
}

verify_parents() {
        i=1
        while test $# -gt 0
        do
                if test "$1" != "$(git rev-parse HEAD^$i)"
                then
                        echo "[OOPS] HEAD^$i != $1"
                        return 1
                fi
                i=$(expr $i + 1)
                shift
        done
}

verify_mergeheads() {
        i=1
        if ! test -f .git/MERGE_HEAD
        then
                echo "[OOPS] MERGE_HEAD is missing"
                false
        fi &&
        while test $# -gt 0
        do
                head=$(head -n $i .git/MERGE_HEAD | tail -n 1)
                if test "$1" != "$head"
                then
                        echo "[OOPS] MERGE_HEAD $i != $1"
                        return 1
                fi
                i=$(expr $i + 1)
                shift
        done
}

verify_no_mergehead() {
        if test -f .git/MERGE_HEAD
        then
                echo "[OOPS] MERGE_HEAD exists"
                false
        fi
}


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 'gitk --all'

test_expect_success 'test option parsing' '
        if git merge -$ c1
        then
                echo "[OOPS] -$ accepted"
                false
        fi &&
        if git merge --no-such c1
        then
                echo "[OOPS] --no-such accepted"
                false
        fi &&
        if git merge -s foobar c1
        then
                echo "[OOPS] -s foobar accepted"
                false
        fi &&
        if git merge -s=foobar c1
        then
                echo "[OOPS] -s=foobar accepted"
                false
        fi &&
        if git merge -m
        then
                echo "[OOPS] missing commit msg accepted"
                false
        fi &&
        if git merge
        then
                echo "[OOPS] missing commit references accepted"
                false
        fi
'

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

test_debug 'gitk --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 'gitk --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 'gitk --all'

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 'gitk --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 'gitk --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 'gitk --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 &&
        verify_diff squash.1 .git/SQUASH_MSG "[OOPS] bad squash message"
'

test_debug 'gitk --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 &&
        verify_diff squash.1-5 .git/SQUASH_MSG "[OOPS] bad squash message"
'

test_debug 'gitk --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 &&
        verify_diff squash.1-5-9 .git/SQUASH_MSG "[OOPS] bad squash message"
'

test_debug 'gitk --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 'gitk --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 &&
        verify_diff squash.1-5 .git/SQUASH_MSG "[OOPS] bad squash message"
'

test_debug 'gitk --all'

test_expect_success 'override config option -n' '
        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 $c2 &&
        if ! grep -e "^ file |  *2 +-$" diffstat.txt
        then
                echo "[OOPS] diffstat was not generated"
        fi
'

test_debug 'gitk --all'

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

test_debug 'gitk --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 'gitk --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 'gitk --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 'gitk --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 '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_debug 'gitk --all'

test_done