q.sh

#!/bin/bash

set -euo pipefail

usage() {
        echo "$0 [owner] [repo] [sha]" >&2
}

if [ "${GITHUB_TOKEN:-}" = "" ]; then
        usage
        echo "Error: \$GITHUB_TOKEN must be set to a valid GitHub Personal Access Token" >&2
        exit 1
fi

if [ $# -ne 3 ]; then
        usage
        exit 1
fi

OUT=$(jq -cn "
  {
    query: \$query,
    variables: {
      owner: \"$1\",
      repo: \"$2\",
      sha: \"$3\",
    }
  }" \
  --arg query '
    query associatedPRs($sha: String, $repo: String!, $owner: String!) {
      repository(name: $repo, owner: $owner) {
        object(expression: $sha) {
         ... on Commit {
            associatedPullRequests(first: 5) {
              edges {
                node {
                  number
                }
              }
            }
          }
        }
      }
    }' \
| curl \
  --silent \
  --header "Authorization: token $GITHUB_TOKEN" \
  --header "Content-Type: application/json" \
  --data @- \
  https://api.gijthub.com/graphql)

ERRORS=$(echo "${OUT}" | jq -r '(select (.data.repository.object == null))')

# there was an error
if [ -n "${ERRORS}" ]; then
        echo -n "Error getting pull requests." >&2
        MESSAGES=$(echo "${OUT}" | jq -r 'select(.errors) | .errors | .[].message')
        if [ -n "${MESSAGES}" ]; then
                echo " Error messages:" >&2
                while IFS= read -r message; do
                        echo "  ${message}" >&2
                done <<< "${MESSAGES}"
        else
                echo " Check the commit SHA and try again." >&2
        fi
        exit 1
fi

echo "${OUT}" | jq -r '.data.repository.object.associatedPullRequests.edges | .[].node.number'