#!/bin/sh

test_description='Test automatic use of a pager.'

. ./test-lib.sh

cleanup_fail() {
        echo >&2 cleanup failed
        (exit 1)
}

test_expect_success 'set up terminal for tests' '
        rm -f stdout_is_tty ||
        cleanup_fail &&

        if test -t 1
        then
                >stdout_is_tty
        elif
                test_have_prereq PERL &&
                "$PERL_PATH" "$TEST_DIRECTORY"/t7006/test-terminal.perl \
                        sh -c "test -t 1"
        then
                >test_terminal_works
        fi
'

if test -e stdout_is_tty
then
        test_terminal() { "$@"; }
        test_set_prereq TTY
elif test -e test_terminal_works
then
        test_terminal() {
                "$PERL_PATH" "$TEST_DIRECTORY"/t7006/test-terminal.perl "$@"
        }
        test_set_prereq TTY
else
        say no usable terminal, so skipping some tests
fi

test_expect_success 'setup' '
        unset GIT_PAGER GIT_PAGER_IN_USE &&
        test_might_fail git config --unset core.pager &&

        PAGER="cat >paginated.out" &&
        export PAGER &&

        test_commit initial
'

test_expect_success TTY 'some commands use a pager' '
        rm -f paginated.out ||
        cleanup_fail &&

        test_terminal git log &&
        test -e paginated.out
'

test_expect_success TTY 'some commands do not use a pager' '
        rm -f paginated.out ||
        cleanup_fail &&

        test_terminal git rev-list HEAD &&
        ! test -e paginated.out
'

test_expect_success 'no pager when stdout is a pipe' '
        rm -f paginated.out ||
        cleanup_fail &&

        git log | cat &&
        ! test -e paginated.out
'

test_expect_success 'no pager when stdout is a regular file' '
        rm -f paginated.out ||
        cleanup_fail &&

        git log >file &&
        ! test -e paginated.out
'

test_expect_success TTY 'git --paginate rev-list uses a pager' '
        rm -f paginated.out ||
        cleanup_fail &&

        test_terminal git --paginate rev-list HEAD &&
        test -e paginated.out
'

test_expect_success 'no pager even with --paginate when stdout is a pipe' '
        rm -f file paginated.out ||
        cleanup_fail &&

        git --paginate log | cat &&
        ! test -e paginated.out
'

test_expect_success TTY 'no pager with --no-pager' '
        rm -f paginated.out ||
        cleanup_fail &&

        test_terminal git --no-pager log &&
        ! test -e paginated.out
'

# A colored commit log will begin with an appropriate ANSI escape
# for the first color; the text "commit" comes later.
colorful() {
        read firstline <$1
        ! expr "$firstline" : "[a-zA-Z]" >/dev/null
}

test_expect_success 'tests can detect color' '
        rm -f colorful.log colorless.log ||
        cleanup_fail &&

        git log --no-color >colorless.log &&
        git log --color >colorful.log &&
        ! colorful colorless.log &&
        colorful colorful.log
'

test_expect_success 'no color when stdout is a regular file' '
        rm -f colorless.log &&
        git config color.ui auto ||
        cleanup_fail &&

        git log >colorless.log &&
        ! colorful colorless.log
'

test_expect_success TTY 'color when writing to a pager' '
        rm -f paginated.out &&
        git config color.ui auto ||
        cleanup_fail &&

        (
                TERM=vt100 &&
                export TERM &&
                test_terminal git log
        ) &&
        colorful paginated.out
'

test_expect_success 'color when writing to a file intended for a pager' '
        rm -f colorful.log &&
        git config color.ui auto ||
        cleanup_fail &&

        (
                TERM=vt100 &&
                GIT_PAGER_IN_USE=true &&
                export TERM GIT_PAGER_IN_USE &&
                git log >colorful.log
        ) &&
        colorful colorful.log
'

test_expect_success 'determine default pager' '
        unset PAGER GIT_PAGER &&
        test_might_fail git config --unset core.pager ||
        cleanup_fail &&

        less=$(git var GIT_PAGER) &&
        test -n "$less"
'

if expr "$less" : '[a-z][a-z]*$' >/dev/null && test_have_prereq TTY
then
        test_set_prereq SIMPLEPAGER
fi

test_expect_success SIMPLEPAGER 'default pager is used by default' '
        unset PAGER GIT_PAGER &&
        test_might_fail git config --unset core.pager &&
        rm -f default_pager_used ||
        cleanup_fail &&

        cat >$less <<-\EOF &&
        #!/bin/sh
        wc >default_pager_used
        EOF
        chmod +x $less &&
        (
                PATH=.:$PATH &&
                export PATH &&
                test_terminal git log
        ) &&
        test -e default_pager_used
'

test_expect_success TTY 'PAGER overrides default pager' '
        unset GIT_PAGER &&
        test_might_fail git config --unset core.pager &&
        rm -f PAGER_used ||
        cleanup_fail &&

        PAGER="wc >PAGER_used" &&
        export PAGER &&
        test_terminal git log &&
        test -e PAGER_used
'

test_expect_success TTY 'core.pager overrides PAGER' '
        unset GIT_PAGER &&
        rm -f core.pager_used ||
        cleanup_fail &&

        PAGER=wc &&
        export PAGER &&
        git config core.pager "wc >core.pager_used" &&
        test_terminal git log &&
        test -e core.pager_used
'

test_expect_success TTY 'GIT_PAGER overrides core.pager' '
        rm -f GIT_PAGER_used ||
        cleanup_fail &&

        git config core.pager wc &&
        GIT_PAGER="wc >GIT_PAGER_used" &&
        export GIT_PAGER &&
        test_terminal git log &&
        test -e GIT_PAGER_used
'

test_done