FastHub/data/src/main/graphql/github/file_content.graphql

query getFileContent($login: String!, $repo: String!, $path: String!) {
    repositoryOwner(login: $login) {
        repository(name: $repo) {
            object(expression: $path) {
                ... on Blob {
                  isBinary
                  byteSize
                  isTruncated
                  text
                }
            }
        }
    }
}