Implement printing selected dependency versions

Author: briancroom

Sources/dep/get.swift

@@ -166,12 +166,14 @@ extension Sandbox: Fetcher {
  }
 
  /// contract, you cannot call this before you have attempted to `constrain` this clone
- func setVersion(v: Version) throws {
+ func setVersion(ver: Version) throws {
  let packageVersionsArePrefixed = repo.versionsArePrefixed
- let v = (packageVersionsArePrefixed ? "v" : "") + v.description
+ let v = (packageVersionsArePrefixed ? "v" : "") + ver.description
  try popen([Git.tool, "-C", path, "reset", "--hard", v])
  try popen([Git.tool, "-C", path, "branch", "-m", v])
 
+ print("Using version \(ver) of package \(Package.name(forURL: url))")
+
  // we must re-read the manifest
  _manifest = nil
  }