Class ExecutableFinder

java/src/org/openqa/selenium/os/ExecutableFinder.java:33–106

import org.openqa.selenium.Platform;

public class ExecutableFinder {
  private static final List<String> ENDINGS =
      Platform.getCurrent().is(WINDOWS)
          ? List.of("", ".cmd", ".exe", ".com", ".bat")
          : singletonList("");

  /**
   * Find the executable by scanning the file system and the PATH. In the case of Windows this
   * method allows common executable endings (".com", ".bat" and ".exe") to be omitted.
   *
   * @param named The name of the executable to find
   * @return The absolute path to the executable, or null if no match is made.
   */
  @Nullable
  public String find(String named) {
    File file = new File(named);
    if (canExecute(file)) {
      return named;
    }

    if (Platform.getCurrent().is(Platform.WINDOWS)) {
      file = new File(named + ".exe");
      if (canExecute(file)) {
        return named + ".exe";
      }
    }

    List<String> pathSegments = new ArrayList<>(fromEnvironment());
    if (Platform.getCurrent().is(Platform.MAC)) {
      pathSegments.addAll(macSpecificPathSegments());
    }

    for (String pathSegment : pathSegments) {
      for (String ending : ENDINGS) {
        file = new File(pathSegment, named + ending);
        if (canExecute(file)) {
          return file.getAbsolutePath();
        }
      }
    }
    return null;
  }

  private List<String> fromEnvironment() {
    String pathName = "PATH";
    Map<String, String> env = System.getenv();
    if (!env.containsKey(pathName)) {
      for (String key : env.keySet()) {
        if (pathName.equalsIgnoreCase(key)) {
          pathName = key;
          break;
        }
      }
    }
    String path = env.get(pathName);
    return path != null ? List.of(path.split(File.pathSeparator)) : emptyList();
  }