Class TextFormatter

packages/query-plan-executor/src/log/format.ts:83–120

 * Formatter that outputs log events as human-readable text with color highlighting.
 */
export class TextFormatter implements ConsoleFormatter {
  format(event: LogEvent): unknown[] {
    const { fmt, params } = mergeFragments([
      TextFormatter.formatLevel(event.level),
      TextFormatter.formatTimestamp(event.timestamp),
      TextFormatter.formatMessage(event.message),
      ...TextFormatter.formatAttributes(event.attributes),
    ])
    return [fmt, ...params]
  }

  private static maxLevelLength = Math.max(...validLogLevels.map((level) => level.length))

  private static formatLevel(level: LogLevel): Fragment {
    return {
      fmt: '%c%s%c',
      params: [levelStyles[level], level.toUpperCase().padEnd(TextFormatter.maxLevelLength), 'color: initial'],
    }
  }

  private static formatTimestamp(timestamp: Temporal.Instant): Fragment {
    return {
      fmt: '%c%s%c',
      params: ['color: gray', timestamp.toString(), 'color: initial'],
    }
  }

  private static formatMessage(message: string): Fragment {
    return { fmt: '%s', params: [message] }
  }

  private static formatAttributes(attributes: Record<string, unknown>): Fragment[] {
    return Object.entries(attributes).map(([key, value]) => ({
      fmt: '%c%s%c=%o',
      params: ['color: cyan', key, 'color: initial', value],
    }))
  }
}