Exit immediately if trying to select currently selected xcode

If the currently requested xcode is already selected, there is no need to prompt the user to give sudo permissions and re-select the path. We can just avoid the step and exit early.

Author: tahirmt

Sources/XcodesKit/XcodeSelect.swift

@@ -22,16 +22,34 @@ public func selectXcode(shouldPrint: Bool, pathOrVersion: String, directory: Pat
             }
         }
 
+        let installedXcodes = Current.files.installedXcodes(directory)
         if let version = Version(xcodeVersion: pathOrVersion),
-           let installedXcode = Current.files.installedXcodes(directory).first(withVersion: version) {
+           let installedXcode = installedXcodes.first(withVersion: version) {
+            let selectedInstalledXcodeVersion = installedXcodes.first { output.out.hasPrefix($0.path.string) }.map { $0.version }
+            if installedXcode.version == selectedInstalledXcodeVersion {
+                Current.logging.log("Xcode \(version) is already selected")
+                Current.shell.exit(0)
+                return Promise.value(())
+            }
+
             return selectXcodeAtPath(installedXcode.path.string)
                 .done { output in
                     Current.logging.log("Selected \(output.out)".green)
                     Current.shell.exit(0)
                 }
         }
         else {
-            return selectXcodeAtPath(pathOrVersion)
+            // remove any whitespaces
+            let pathToSelect = pathOrVersion.trimmingCharacters(in: .whitespacesAndNewlines)
+            let currentPath = output.out.trimmingCharacters(in: .whitespacesAndNewlines)
+
+            if pathToSelect == currentPath {
+                Current.logging.log("Xcode at path \(pathOrVersion) is already selected")
+                Current.shell.exit(0)
+                return Promise.value(())
+            }
+
+            return selectXcodeAtPath(pathToSelect)
                 .done { output in
                     Current.logging.log("Selected \(output.out)".green)
                     Current.shell.exit(0)
@@ -94,7 +112,7 @@ public func chooseFromInstalledXcodesInteractively(currentPath: String, director
         return Promise(error: error)
     }
 
-    return Promise.value(sortedInstalledXcodes[selectionNumber - 1]) 
+    return Promise.value(sortedInstalledXcodes[selectionNumber - 1])
 }
 
 public func selectXcodeInteractively(currentPath: String, directory: Path) -> Promise<ProcessOutput> {