Compare two String Versions

String.swift

extension String {
  func getRawVersionString() -> String? {
      return self.removePrefix("v")
          .split(separator: "-")
          .first?.toString()
  }

  // Modified from the DragonCherry extension - https://github.com/DragonCherry/VersionCompare
  private func compare(toVersion targetVersion: String) -> ComparisonResult {
      let versionDelimiter = "."
      var result: ComparisonResult = .orderedSame
      var versionComponents = components(separatedBy: versionDelimiter)
      var targetComponents = targetVersion.components(separatedBy: versionDelimiter)

      while versionComponents.count < targetComponents.count {
          versionComponents.append("0")
      }
      while targetComponents.count < versionComponents.count {
          targetComponents.append("0")
      }

      for (version, target) in zip(versionComponents, targetComponents) {
          result = version.compare(target, options: .numeric)
          if result != .orderedSame {
              break
          }
      }

      return result
  }

  func isVersion(equalTo targetVersion: String) -> Bool { return compare(toVersion: targetVersion) == .orderedSame }
  func isVersion(greaterThan targetVersion: String) -> Bool { return compare(toVersion: targetVersion) == .orderedDescending }
  func isVersion(greaterThanOrEqualTo targetVersion: String) -> Bool { return compare(toVersion: targetVersion) != .orderedAscending }
  func isVersion(lessThan targetVersion: String) -> Bool { return compare(toVersion: targetVersion) == .orderedAscending }
  func isVersion(lessThanOrEqualTo targetVersion: String) -> Bool { return compare(toVersion: targetVersion) != .orderedDescending }
}