Add support for home, end, delete, and ctrl+w

src/module/repl.wren

@@ -71,6 +71,15 @@ class Repl {
       deleteLeft()
     } else if (byte >= Chars.space && byte <= Chars.tilde) {
       insertChar(byte)
+    } else if (byte == Chars.ctrlW) { // Handle Ctrl+w
+      // Delete trailing spaces
+      while (_cursor != 0 && _line[_cursor - 1] == " ") {
+        deleteLeft()
+      }
+      // Delete until the next space
+      while (_cursor != 0 && _line[_cursor - 1] != " ") {
+        deleteLeft()
+      }
     } else {
       // TODO: Other shortcuts?
       System.print("Unhandled key-code [dec]: %(byte)")
@@ -108,6 +117,14 @@ class Repl {
       previousHistory()
     } else if (byte == EscapeBracket.down) {
       nextHistory()
+    } else if (byte == EscapeBracket.delete) {
+      deleteRight()
+      // Consume extra 126 character generated by delete
+      Stdin.readByte()
+    } else if (byte == EscapeBracket.end) {
+      _cursor = _line.count
+    } else if (byte == EscapeBracket.home) {
+      _cursor = 0
     }
   }
 
@@ -403,6 +420,7 @@ class Chars {
   static ctrlN { 0x0e }
   static ctrlP { 0x10 }
   static ctrlU { 0x15 }
+  static ctrlW { 0x17 }
   static escape { 0x1b }
   static space { 0x20 }
   static bang { 0x21 }
@@ -470,10 +488,13 @@ class Chars {
 }
 
 class EscapeBracket {
+  static delete { 0x33 }
   static up { 0x41 }
   static down { 0x42 }
   static right { 0x43 }
   static left { 0x44 }
+  static end { 0x46 }
+  static home { 0x48 }
 }
 
 class Token {