void verifyInputs()

in source/depth_estimation/DerpCLI.cpp [67:116]
42 lines of code
12 McCabe index (conditional complexity)

void verifyInputs() {
  CHECK_NE(FLAGS_input_root, "");
  CHECK_NE(FLAGS_output_root, "");
  if (FLAGS_level_start >= 0 && FLAGS_level_end >= 0) {
    CHECK_GE(FLAGS_level_start, FLAGS_level_end);
  }

  if (FLAGS_rig.empty()) {
    FLAGS_rig = FLAGS_input_root + "/rigs/rig_calibrated.json";
  }
  if (FLAGS_color.empty()) {
    FLAGS_color = getImageDir(FLAGS_input_root, ImageType::color_levels).string();
  }
  if (FLAGS_background_disp.empty()) {
    FLAGS_background_disp =
        getImageDir(FLAGS_input_root, ImageType::background_disp_levels).string();
  }
  if (FLAGS_foreground_masks.empty()) {
    FLAGS_foreground_masks =
        getImageDir(FLAGS_input_root, ImageType::foreground_masks_levels).string();
  }

  // Check flag values
  CHECK_GE(FLAGS_random_proposals, 0);
  CHECK_LE(FLAGS_first, FLAGS_last);

  const bool hasColorImages = filesystem::is_directory(FLAGS_color);
  CHECK(hasColorImages) << "No images in " << FLAGS_color;

  if (FLAGS_use_foreground_masks) {
    const bool hasBackgroundDisps = filesystem::is_directory(FLAGS_background_disp);
    CHECK(hasBackgroundDisps) << "Asked to use background but no background disparities found in "
                              << FLAGS_background_disp;

    const bool hasDstForegroundMasks = filesystem::is_directory(FLAGS_foreground_masks);
    CHECK(hasDstForegroundMasks)
        << "Asked to use foreground masks but no foreground masks found in "
        << FLAGS_foreground_masks;
  }

  std::vector<std::string> outputFormats;
  folly::split(",", FLAGS_output_formats, outputFormats);
  for (std::string& outputFormat : outputFormats) {
    // We allow size 0 inputs to ensure stray commas are ignored, i.e. exr,,png is fine
    CHECK(
        outputFormat.size() == 0 || outputFormat == "exr" || outputFormat == "png" ||
        outputFormat == "pfm")
        << "Invalid output format specified: " << outputFormat;
  }
}