todoapp: use local storage properly

src/jstrutils.nim

@@ -21,3 +21,5 @@ proc isInt*(s: cstring): bool {.asmNoStackFrame.} =
   asm """
     return s.match(/^[0-9]+$/);
   """
+
+proc parseInt*(s: cstring): int {.importcpp: "parseInt(#, 10)", nodecl.}

src/localstorage.nim

@@ -0,0 +1,10 @@
+## Karax -- Single page applications for Nim.
+
+## This module contains wrappers for the HTML 5 local storage.
+
+proc getItem*(key: cstring): cstring {.importc: "localStorage.getItem"}
+proc setItem*(key, value: cstring) {.importc: "localStorage.setItem"}
+proc hasItem*(key: cstring): bool {.importcpp: "(localStorage.getItem(#) !== null)".}
+proc clear*() {.importc: "localStorage.clear"}
+
+proc removeItem*(key: cstring) {.importc: "localStorage.removeItem".}