Add command to generate Colors

Sources/CLIToolCore/Extensions.swift

@@ -0,0 +1,64 @@
+//
+//  Extensions.swift
+//  
+//
+//  Created by Thibaut Schmitt on 13/12/2021.
+//
+
+import Foundation
+
+// MARK: - String
+
+public extension String {
+    func removeCharacters(from forbiddenChars: CharacterSet) -> String {
+        let passed = self.unicodeScalars.filter { !forbiddenChars.contains($0) }
+        return String(String.UnicodeScalarView(passed))
+    }
+    
+    func removeCharacters(from: String) -> String {
+        return removeCharacters(from: CharacterSet(charactersIn: from))
+    }
+    
+    func removeTrailingWhitespace() -> String {
+        var newString = self
+        
+        while newString.last?.isWhitespace == true {
+            newString = String(newString.dropLast())
+        }
+        
+        return newString
+    }
+    
+    func colorComponent()  -> (alpha: String, red: String, green: String, blue: String) {
+        var alpha: String = "FF"
+        var red: String
+        var green: String
+        var blue: String
+
+        var colorClean = self
+                .replacingOccurrences(of: "#", with: "")
+                .replacingOccurrences(of: "0x", with: "")
+
+        if colorClean.count == 8 {
+            alpha = String(colorClean.prefix(2))
+            colorClean = String(colorClean.dropFirst(2))
+        }
+        
+        red = String(colorClean.prefix(2))
+        colorClean = String(colorClean.dropFirst(2))
+        green = String(colorClean.prefix(2))
+        colorClean = String(colorClean.dropFirst(2))
+        blue = String(colorClean.prefix(2))
+        return (alpha: alpha, red: red, green: green, blue: blue)
+    }
+}
+
+// MARK: - Sequence
+
+extension Sequence where Iterator.Element: Hashable {
+    public func unique() -> [Iterator.Element] {
+        var seen: [Iterator.Element: Bool] = [:]
+        return self.filter { seen.updateValue(true, forKey: $0) == nil }
+    }
+}
+