Class: Rubydex::CLI::Command::Query

Inherits:
Command
  • Object
show all
Defined in:
lib/rubydex/cli/command/query.rb

Instance Method Summary collapse

Instance Method Details

#run ⇒ Object

: -> void



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# File 'lib/rubydex/cli/command/query.rb', line 20

def run
  schema = false
  format = "table"

  parse_options!(options: true) do |parser|
    parser.on("--schema", "Describe the queryable schema instead of running a query") { schema = true }
    parser.on("--format FORMAT", ["table", "json"], "Output format (table or json)") do |value|
      format = value
    end
  end

  query = argv.shift

  if schema
    warn("warning: ignoring query argument because `--schema` was given") if query
    # The schema is static, so describe it without building a graph.

    print(Rubydex::Query.schema(format))
    return
  end

  if query.nil? || query.empty?
    abort_with_usage("`query` requires a Cypher query argument (or pass `--schema`)")
  end

  # Parse the query up front so a malformed query fails fast, before the expensive indexing.

  parsed = parse_query(query)

  # Progress goes to stderr so stdout carries only the result (e.g. for piping a query's JSON).

  graph = build_graph($stderr)

  begin
    result = parsed.run(graph)
  rescue Rubydex::QueryExecutionError => e
    abort(e.message)
  end

  print(result.render(format))
end