ghquery: hit GitHub's GraphQL API from shell

ghquery.sh

# ghquery: hit GitHub's GraphQL API
# Set the GITHUB_TOKEN environment variable.
ghquery() {
    if [ "$#" -gt 1 ]; then
        printf >&2 'ghquery: bad invocation\n'
        printf >&2 'usage: ghquery [GRAPHQL_COMMAND]\n'
        printf >&2 'if no args provided, command will be read from stdin\n'
        return 1
    fi
    case "$#" in
        0) cat ;;
        1) printf '%s' "$1" ;;
    esac |
    jq -csR '{query: ., variables: {}}' |
        curl 'https://api.github.com/graphql' -X POST \
        -H "Authorization: bearer ${GITHUB_TOKEN}" \
        -d @-
}