#!/bin/sh

test_description='undoing resolution'

. ./test-lib.sh

check_resolve_undo () {
        msg=$1
        shift
        while case $# in
        0)      break ;;
        1|2|3)  die "Bug in check-resolve-undo test" ;;
        esac
        do
                path=$1
                shift
                for stage in 1 2 3
                do
                        sha1=$1
                        shift
                        case "$sha1" in
                        '') continue ;;
                        esac
                        sha1=$(git rev-parse --verify "$sha1")
                        printf "100644 %s %s\t%s\n" $sha1 $stage $path
                done
        done >"$msg.expect" &&
        git ls-files --resolve-undo >"$msg.actual" &&
        test_cmp "$msg.expect" "$msg.actual"
}

prime_resolve_undo () {
        git reset --hard &&
        git checkout second^0 &&
        test_tick &&
        test_must_fail git merge third^0 &&
        echo merge does not leave anything &&
        check_resolve_undo empty &&
        echo different >fi/le &&
        git add fi/le &&
        echo resolving records &&
        check_resolve_undo recorded fi/le initial:fi/le second:fi/le third:fi/le
}

test_expect_success setup '
        mkdir fi &&
        test_commit initial fi/le first &&
        git branch side &&
        git branch another &&
        test_commit second fi/le second &&
        git checkout side &&
        test_commit third fi/le third &&
        git checkout another &&
        test_commit fourth fi/le fourth &&
        git checkout master
'

test_expect_success 'add records switch clears' '
        prime_resolve_undo &&
        test_tick &&
        git commit -m merged &&
        echo committing keeps &&
        check_resolve_undo kept fi/le initial:fi/le second:fi/le third:fi/le &&
        git checkout second^0 &&
        echo switching clears &&
        check_resolve_undo cleared
'

test_expect_success 'rm records reset clears' '
        prime_resolve_undo &&
        test_tick &&
        git commit -m merged &&
        echo committing keeps &&
        check_resolve_undo kept fi/le initial:fi/le second:fi/le third:fi/le &&

        echo merge clears upfront &&
        test_must_fail git merge fourth^0 &&
        check_resolve_undo nuked &&

        git rm -f fi/le &&
        echo resolving records &&
        check_resolve_undo recorded fi/le initial:fi/le HEAD:fi/le fourth:fi/le &&

        git reset --hard &&
        echo resetting discards &&
        check_resolve_undo discarded
'

test_expect_success 'plumbing clears' '
        prime_resolve_undo &&
        test_tick &&
        git commit -m merged &&
        echo committing keeps &&
        check_resolve_undo kept fi/le initial:fi/le second:fi/le third:fi/le &&

        echo plumbing clear &&
        git update-index --clear-resolve-undo &&
        check_resolve_undo cleared
'

test_expect_success 'add records checkout -m undoes' '
        prime_resolve_undo &&
        git diff HEAD &&
        git checkout --conflict=merge fi/le &&
        echo checkout used the record and removed it &&
        check_resolve_undo removed &&
        echo the index and the work tree is unmerged again &&
        git diff >actual &&
        grep "^++<<<<<<<" actual
'

test_expect_success 'unmerge with plumbing' '
        prime_resolve_undo &&
        git update-index --unresolve fi/le &&
        git ls-files -u >actual &&
        test_line_count = 3 actual
'

test_expect_success 'rerere and rerere forget' '
        mkdir .git/rr-cache &&
        prime_resolve_undo &&
        echo record the resolution &&
        git rerere &&
        rerere_id=$(cd .git/rr-cache && echo */postimage) &&
        rerere_id=${rerere_id%/postimage} &&
        test -f .git/rr-cache/$rerere_id/postimage &&
        git checkout -m fi/le &&
        echo resurrect the conflict &&
        grep "^=======" fi/le &&
        echo reresolve the conflict &&
        git rerere &&
        test "z$(cat fi/le)" = zdifferent &&
        echo register the resolution again &&
        git add fi/le &&
        check_resolve_undo kept fi/le initial:fi/le second:fi/le third:fi/le &&
        test -z "$(git ls-files -u)" &&
        git rerere forget fi/le &&
        ! test -f .git/rr-cache/$rerere_id/postimage &&
        tr "\0" "\n" <.git/MERGE_RR >actual &&
        echo "$rerere_id        fi/le" >expect &&
        test_cmp expect actual
'

test_expect_success 'rerere and rerere forget (subdirectory)' '
        rm -fr .git/rr-cache &&
        mkdir .git/rr-cache &&
        prime_resolve_undo &&
        echo record the resolution &&
        (cd fi && git rerere) &&
        rerere_id=$(cd .git/rr-cache && echo */postimage) &&
        rerere_id=${rerere_id%/postimage} &&
        test -f .git/rr-cache/$rerere_id/postimage &&
        (cd fi && git checkout -m le) &&
        echo resurrect the conflict &&
        grep "^=======" fi/le &&
        echo reresolve the conflict &&
        (cd fi && git rerere) &&
        test "z$(cat fi/le)" = zdifferent &&
        echo register the resolution again &&
        (cd fi && git add le) &&
        check_resolve_undo kept fi/le initial:fi/le second:fi/le third:fi/le &&
        test -z "$(git ls-files -u)" &&
        (cd fi && git rerere forget le) &&
        ! test -f .git/rr-cache/$rerere_id/postimage &&
        tr "\0" "\n" <.git/MERGE_RR >actual &&
        echo "$rerere_id        fi/le" >expect &&
        test_cmp expect actual
'

test_done