Add script to "shrink" SystemUiRavenTests

#!/bin/bash

# Copyright (C) 2024 The Android Open Source Project

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#      http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

set -e

SCRIPT_NAME="${0##*/}"

usage() {

    cat <<"EOF"

$SCRIPT_NAME: Shrink / unshrink SystemUiRavenTests.

    SystemUiRavenTests has a lot of kotlin source files, so it's slow to build,

    which is painful when you want to run it after updating ravenwood code

    that SystemUiRavenTests depends on. (example: junit-src/)

    This script basically removes the test files in SystemUI/multivalentTests

    that don't have @EnabledOnRavenwood. But if we actaully remove them,

    soong would re-generate the ninja file, which will take a long time,

    so instead it'll truncate them.

    This script will also tell git to ignore these files, so they won't shw up

    in `git status`.

    (Use `git ls-files -v | sed -ne "s/^[a-zS] //p"` to show ignored filse.)

Usage:

    $SCRIPT_NAME -s # Shrink the test files.

    $SCRIPT_NAME -u # Undo it.

EOF

}

TEST_PATH=${ANDROID_BUILD_TOP}/frameworks/base/packages/SystemUI/multivalentTests

cd "$TEST_PATH"

command=""

case "$1" in

    "-s") command=shrink ;;

    "-u") command=unshrink ;;

    *) usage ; exit 1 ;;

esac

echo "Listing test files...."

files=( $(find . -name '*Test.kt' -o -name '*Test.java') )

exemption='(BaseHeadsUpManagerTest)'

shrink() {

    local target=()

    for file in ${files[@]}; do

        # Check for exemption

        if echo $file | egrep -q "$exemption"; then

            echo "  Skip exempted file"

            continue

        fi

        echo "Checking $file"

        if ! [[ -f $file ]] ; then

            echo "  Skip non regular file"

            continue

        fi

        if ! [[ -s $file ]] ; then

            echo "  Skip empty file"

            continue

        fi

        if grep -q '@EnabledOnRavenwood' $file ; then

            echo "  Skip ravenwood test file".

            continue

        fi

        # It's a non ravenwood test file. Empty it.

        : > $file

        # Tell git to ignore the file

        target+=($file)

        echo "  Emptied"

    done

    if (( ${#target[@]} == 0 )) ; then

        echo "No files emptied."

        return 0

    fi

    git update-index --skip-worktree ${target[@]}

    echo "Emptied ${#target[@]} files"

    return 0

}

unshrink() {

    local target=()

    # Collect empty files

    for file in ${files[@]}; do

        if [[ -s $file ]] ; then

            continue

        fi

        target+=($file)

        : > $file

    done

    if (( ${#target[@]} == 0 )) ; then

        echo "No files to restore."

        return 0

    fi

    # Un-ignore the files, and check out the original files

    echo "Restoring ${#target[@]} files..."

    git update-index --no-skip-worktree ${target[@]}

    git checkout goog/main ${target[@]}

    return 0

}

$command