#!/bin/sh

test_description='test various @{X} syntax combinations together'
. ./test-lib.sh

check() {
        test_expect_${4:-success} "$1 = $3" "
                echo '$3' >expect &&
                if test '$2' = 'commit'
                then
                        git log -1 --format=%s '$1' >actual
                else
                        git rev-parse --symbolic-full-name '$1' >actual
                fi &&
                test_cmp expect actual
        "
}

nonsense() {
        test_expect_${2:-success} "$1 is nonsensical" "
                test_must_fail git rev-parse --verify '$1'
        "
}

fail() {
        "$@" failure
}

test_expect_success 'setup' '
        test_commit master-one &&
        test_commit master-two &&
        git checkout -b upstream-branch &&
        test_commit upstream-one &&
        test_commit upstream-two &&
        git checkout -b old-branch &&
        test_commit old-one &&
        test_commit old-two &&
        git checkout -b new-branch &&
        test_commit new-one &&
        test_commit new-two &&
        git branch -u master old-branch &&
        git branch -u upstream-branch new-branch
'

check HEAD ref refs/heads/new-branch
check "@{1}" commit new-one
check "HEAD@{1}" commit new-one
check "@{now}" commit new-two
check "HEAD@{now}" commit new-two
check "@{-1}" ref refs/heads/old-branch
check "@{-1}@{0}" commit old-two
check "@{-1}@{1}" commit old-one
check "@{u}" ref refs/heads/upstream-branch
check "HEAD@{u}" ref refs/heads/upstream-branch
check "@{u}@{1}" commit upstream-one
check "@{-1}@{u}" ref refs/heads/master
check "@{-1}@{u}@{1}" commit master-one
nonsense "@{u}@{-1}"
nonsense "@{0}@{0}"
nonsense "@{1}@{u}"
nonsense "HEAD@{-1}"
nonsense "@{-1}@{-1}"

# @{N} versus HEAD@{N}

check "HEAD@{3}" commit old-two
nonsense "@{3}"

test_expect_success 'switch to old-branch' '
        git checkout old-branch
'

check HEAD ref refs/heads/old-branch
check "HEAD@{1}" commit new-two
check "@{1}" commit old-one

test_done