List pull requests that touch/change a specified file or path

list-prs-for-path.sh

#!/bin/bash

# dependencies: jq, gh

if [ -z "$1" ]; then
  echo "Usage: list-prs-for-path PATH [branch]";
  echo "Lists all PRs touching files starting with PATH";
  exit 1;
fi

branch=${2:-$(gh repo view --json defaultBranchRef --jq '.defaultBranchRef.name')}

echo "Querying PRs to branch $branch touching paths starting with '$1'";

cursor=
match_count=0
while true; do
  response=$(gh api graphql -f query="query {
    repository($(gh repo view --json 'name,owner' --template 'owner: "{{.owner.login}}", name: "{{.name}}"')) {
      pullRequests(
        first: 100,
        ${cursor:+"after: \"$cursor\","}
        states: OPEN,
        baseRefName: \"$branch\",
        orderBy: {
          field: UPDATED_AT,
          direction: DESC
        }
      ) {
        totalCount
        edges {
          node {
            number author {
              login
            }
            title updatedAt url
            files(first: 100) {
              nodes {
                path
              }
            }
          }
        }
        pageInfo {
          endCursor
          hasNextPage
        }
    } }
  }")

  # # uncomment for debugging:
  # jq -r '.' <<<"$response"

  errors=$(jq -r '.errors' <<< "$response")
  if [ ! "$errors" = "null" ]; then
    echo "GitHub API Query returned errors: $errors" >&2;
    exit 1;
  fi

  result_set=$(jq -r '.data.repository.pullRequests' <<< "$response")
  : ${total_count:=$(jq -r '.totalCount' <<< "$result_set")}

  has_next_page=$(jq -r '.pageInfo.hasNextPage | select(.)' <<< "$result_set")
  cursor=${has_next_page:+$(jq -r '.pageInfo.endCursor' <<< "$result_set")}

  matching_pull_requests=$(jq -r --arg path "$1" '
    .edges
    | map(.node | select(
      .files.nodes | map(select(.path | startswith($path))) | length > 0
    ))
  ' <<< "$result_set")
  ((match_count+=$(jq -r 'length' <<< "$matching_pull_requests")))

  jq -r --arg path "$1" '.[]
    | {
      number: .number, title: .title, author: .author.login,
      updatedAt: .updatedAt,
      url: .url,
      matchingChangedFiles: .files.nodes | map(.path | select(startswith($path)))
    }
  ' <<< "$matching_pull_requests"

  [ -n "$cursor" ] || break;
done;

echo "Matched $match_count out of $total_count open pull requests for branch '$branch'";