combine-prs.sh

#!/bin/bash

set -euo pipefail

COMBINED_BRANCH=combined-pr-branch
BODY_FILE=/tmp/.combined-pr-body.md
LIMIT=50

echo -n > $BODY_FILE

git fetch
git checkout master
git pull --ff-only

git branch -D combined-pr-branch || true
git checkout -b $COMBINED_BRANCH

echo $'Combining multiple dependencies PRs into one:\n\n' > $BODY_FILE

count=0
gh pr list --search "author:app/dependabot" --limit 100 --json headRefName,number | jq -r ".[] | [.number,.headRefName] | @tsv" | while read -r NUMBER HEADREF
do
    if [[ $(gh pr checks "$NUMBER" | cut -d$'\t' -f2 | grep -E "fail|pending" -c) -gt 0 ]]; then
        echo "Checks are not all passing - skipping PR #$NUMBER"
        continue
    fi

    echo "Trying to merge $HEADREF into $COMBINED_BRANCH"
    if [[ ! $(git merge "origin/$HEADREF" --no-edit) ]]; then
        echo "Unable to merge $HEADREF - skipping PR #$NUMBER"
        continue
    fi
    echo "Merged $HEADREF into $COMBINED_BRANCH"

    DESCRIPTION=$(gh pr view "$NUMBER" --json title,author,number --template '{{.title}} (#{{.number}}) @{{.author.login}}')
    echo "* ${DESCRIPTION}" >> $BODY_FILE
    cat $BODY_FILE

    ((count=count+1))
    if [[ $count == "$LIMIT" ]]; then
        echo "Hit limit of $LIMIT - no more PRs will be added"
        break
    fi
done

echo "Creating PR if one does not exist"
gh pr create --title "Combined dependencies PR" --body-file $BODY_FILE --label dependencies