Migrate changes from prestodb/presto to prestosql/presto ~/misc/migrate_changes.sh

migrate_changes.sh

#!/usr/bin/env bash

set -euo pipefail

usage() {
	echo "Usage: $0 <git change set>"
	exit 1;
}

ask() {
    echo "$@ [y|N]"
    read answer
    [[ "$answer" == y || "$answer" == Y ]]
}

if [[ $# != 1 ]]; then
    usage
fi

commits="$(git log $1 --pretty='%H' --reverse)"

touch migrated
for commit in $commits; do
    if grep $commit migrated -q; then
        echo "Commit $commit is already migrated, see 'migrated' file"
        continue
    fi
    git show $commit > $commit.diff
    sed -i \
        -e 's@com/facebook/presto.hive@io/prestosql/plugin/hive@g' \
        -e 's@com/facebook/presto@io/prestosql@g' \
        -e 's@facebook/presto@prestosql@g' \
        -e 's@com.facebook.presto.hive@io.prestosql.plugin.hive@g' \
        -e 's@com.facebook.presto@io.prestosql@g' \
        $commit.diff
    if ! git apply -3 < $commit.diff; then
        git mergetool
        if ask "Apply manually?" && ! git apply --reject < $commit.diff; then
            rejected_files_count="$(find -name '*.rej' | wc -l)"
            if [[ "$rejected_files_count" -ne 0 ]]; then
                echo "There are $rejected_files_count rejected files"
                ask "Would you like to fix them manually?"
                for rejected in $(find -name '*.rej'); do
                    # care about new imports, assuming that old imports will be optimized
                    if new_imports="$(cat "$rejected" | grep +import | sed 's/+//g' | tr -d '\n')"; then
                        sed -i "s/\(^package.*;\)/&$new_imports/" -i ${rejected%.rej}
                        if [[ $(cat "$rejected" | grep '^[+-]' | grep -v '[+-]import' | wc -l) -eq 0 ]]; then
                            echo "Skipping $rejected, only import changes"
                        else 
                            vim -o "$rejected" "${rejected%.rej}"
                        fi
                    else
                        vim -o "$rejected" "${rejected%.rej}"
                    fi
                    rm "$rejected"
                done
            fi
        fi
    fi
    modules="$(cat $commit.diff | grep '^[-+][+-][+-]' | cut -d / -f 2 | sort -u | tr '\n' , | sed 's/.$//')"
    git add '*java'
    git add '*pom.xml'
    git status
    if ask "Would you like to rebuild ($modules)? Also now is a good moment to optimize imports."; then
        ./mvnw package -pl "$modules" -DskipTests=true -TC1
    fi
    # in case imports were optimized
    git add '*java'
    git commit -a \
        --author="$(git log $commit -1 --format='%an <%ae>')" \
        --message="$(git log $commit -1 --format='%B')"
    rm $commit.diff
    echo $commit >> migrated
done
rm migrated

echo "All patches are applied"
modules="$(git show $1 | grep '^[-+][+-][+-]' | grep -v dev/null | cut -d / -f 2 | sort -u | tr '\n' , | sed 's/.$//')"
if ask "Would you like to rebuild ($modules)? Also now is a good moment to optimize imports."; then
    ./mvnw package -pl "$modules" -DskipTests=true
fi