first Handler component: Nothing.

src/main/scala/app/Base.scala

@@ -0,0 +1,66 @@
+package app
+
+import scala.scalajs.js
+import org.scalajs.dom
+import slinky.core.FunctionalComponent
+import slinky.web.html._
+import slinky.core.facade.Hooks._
+
+import app.handlers.{Handler, Nothing}
+
+object Base {
+  val handlers: List[Handler] = List(Nothing)
+
+  val component = FunctionalComponent[Unit] { props =>
+    val (typedValue, setTypedValue) = useState("")
+
+    useEffect(
+      () => {
+        val saved = dom.window.localStorage.getItem("value")
+        println(s"saved: ${saved}")
+        setTypedValue(saved match { case _: String => saved; case _ => "" })
+      },
+      Seq()
+    )
+
+    useEffect(
+      () => {
+        dom.window.localStorage.setItem("value", typedValue)
+      },
+      Seq(typedValue)
+    )
+
+    val Handler = handlers
+      .find(handler => handler.handles(typedValue))
+      .getOrElse(Nothing)
+
+    div(
+      style := js.Dynamic.literal(
+        fontFamily = "monospace"
+      )
+    )(
+      div(
+        h1("nostr army knife"),
+        p("paste something nostric"),
+        textarea(
+          value := typedValue,
+          onChange := { ev => setTypedValue(ev.target.value) },
+          style := js.Dynamic.literal(
+            padding = "7px",
+            width = "100%",
+            minHeight = "200px"
+          )
+        )
+      ),
+      hr(style := js.Dynamic.literal(margin = "18px 0")),
+      div(
+        style := js.Dynamic.literal(
+          width = "90%",
+          margin = "auto"
+        )
+      )(
+        Handler.component(typedValue)
+      )
+    )
+  }
+}

src/main/scala/app/handlers/Handler.scala

@@ -0,0 +1,8 @@
+package app.handlers
+
+import slinky.core.FunctionalComponent
+
+trait Handler {
+  def handles(value: String): Boolean
+  val component: FunctionalComponent[String]
+}

src/main/scala/app/handlers/Nothing.scala

@@ -0,0 +1,34 @@
+package app.handlers
+
+import scala.scalajs.js
+import slinky.core.FunctionalComponent
+import slinky.web.html._
+import slinky.core.facade.Hooks._
+import slinky.core.facade.Fragment
+
+import app.handlers.{Handler}
+
+object Nothing extends Handler {
+  override def handles(value: String): Boolean = true
+
+  override val component = FunctionalComponent[String] { props =>
+    Fragment(
+      p("you can paste here"),
+      ul(
+        li("an unsigned event to be hashed and signed"),
+        li("a signed event to have its signature checked"),
+        li("a nostr relay URL to be inspected"),
+        li("a nostr event id we'll try to fetch"),
+        li("a nip05 identifier to be checked"),
+        li(
+          span("contribute a new function: "),
+          a(
+            target := "_blank",
+            href := "https://github.com/fiatjaf/nostr-army-knife",
+            style := js.Dynamic.literal(color = "inherit")
+          )("_______")
+        )
+      )
+    )
+  }
+}

src/main/scala/app/main.scala

@@ -4,15 +4,16 @@ import org.scalajs.dom.document
 import slinky.web.ReactDOM
 import slinky.web.html._
 
+import app.Base._
+
 object Main {
   def main(args: Array[String]): Unit = {
     val div = document.createElement("div")
     div.id = "root"
     document.body.appendChild(div)
-    println("Hello!")
 
     ReactDOM.render(
-      h1("Hello, world?"),
+      Base.component(),
       document.getElementById("root")
     )
   }