Clean up.

src/AppDelegate.swift

@@ -46,12 +46,6 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSWindowDelegate {
         }
     }
 
-    //func applicationWillTerminate(_ notification: Notification) {
-    //}
-
-    func windowDidBecomeKey(_ notification: Notification) {
-    }
-
     func windowDidResignKey(_ notification: Notification) {
         if window.isVisible {
             window.orderOut(nil)
@@ -86,51 +80,3 @@ class AppDelegate: NSObject, NSApplicationDelegate, NSWindowDelegate {
         }
     }
 }
-
-extension String {
-    subscript(index: Int) -> Character {
-        return self[self.index(self.startIndex, offsetBy: index)]
-    }
-}
-
-extension String {
-    public func levenshtein(_ other: String) -> Int {
-        let sCount = self.count
-        let oCount = other.count
-
-        guard sCount != 0 else {
-            return oCount
-        }
-
-        guard oCount != 0 else {
-            return sCount
-        }
-
-        let line : [Int]  = Array(repeating: 0, count: oCount + 1)
-        var mat : [[Int]] = Array(repeating: line, count: sCount + 1)
-
-        for i in 0...sCount {
-            mat[i][0] = i
-        }
-
-        for j in 0...oCount {
-            mat[0][j] = j
-        }
-
-        for j in 1...oCount {
-            for i in 1...sCount {
-                if self[i - 1] == other[j - 1] {
-                    mat[i][j] = mat[i - 1][j - 1]       // no operation
-                }
-                else {
-                    let del = mat[i - 1][j] + 1         // deletion
-                    let ins = mat[i][j - 1] + 1         // insertion
-                    let sub = mat[i - 1][j - 1] + 1     // substitution
-                    mat[i][j] = min(min(del, ins), sub)
-                }
-            }
-        }
-
-        return mat[sCount][oCount]
-    }
-}