How to get relative path?

[devSC]

It's have a easy method to get relative path?

[phimage]

relative path from what? from current path?

there is no cocoa functions I think so we must implement it

I could provide a non tested code

• maybe we must standardize the path before
• then some code maybe are not swift3 . compliant

• return a Path will be more elegant

  extension Path {
  
  func stringWithPathRelative(to anchorPath: Path) -> String {
      let pathComponents = self. components
      let anchorComponents = anchorPath. components
  
      var componentsInCommon = 0
      for (c1, c2) in zip(pathComponents, anchorComponents) {
          if c1 != c2 {
              break
          }
          componentsInCommon += 1
      }
  
      let numberOfParentComponents = anchorComponents.count - componentsInCommon
      let numberOfPathComponents = pathComponents.count - componentsInCommon
  
      var relativeComponents = [String]()
      relativeComponents.reserveCapacity(numberOfParentComponents + numberOfPathComponents)
      for _ in 0..<numberOfParentComponents {
          relativeComponents.append("..")
      }
      relativeComponents.appendContentsOf(pathComponents[componentsInCommon..<pathComponents.count])
  
      return String.pathWithComponents(relativeComponents)
  }
  }

[ivankolesnik]

I have something like this in my extension

    func relativeTo(path: Path) -> Path? {
        let root = path.components
        let this = self.components

        guard this.starts(with: root) else {
            return nil
        }

        let rel = this.suffix(from: root.endIndex)
        let path = rel.map({ $0.rawValue }).joined(separator: "/")

        return Path(path)
    }

And I use it like that

let filePath = file.relativeTo(path: Path.userDocuments)

This function does not handle some edge cases, but it suits my needs.

[neoneye]

I have made separate repo, SwiftyRelativePath, for just this purpose with tests for edge cases.

let url0 = URL(fileURLWithPath: "/computer/qubit/17")
let url1 = URL(fileURLWithPath: "/computer/lab")
url0.relativePath(from: url1) // -> "../qubit/17"

Feel free to import it into FileKit.