implement nested handlers in call block

src/App.tsx

@@ -1,4 +1,3 @@
-// import { useState } from 'react'
 import { useEffect, useState } from 'react';
 import './App.css'
 import { Editor, initialEditorState, type EditorState } from './Editor'
@@ -82,9 +81,9 @@ const tripleFunctionCallEditorState: EditorState = {
 }
 
 export function App() {
-  const [history, setHistory] = useState([initialEditorState]);
+  // const [history, setHistory] = useState([initialEditorState]);
   // const [history, setHistory] = useState([nonEmptyEditorState]);
-  // const [history, setHistory] = useState([tripleFunctionCallEditorState]);
+  const [history, setHistory] = useState([tripleFunctionCallEditorState]);
 
   const [future, setFuture] = useState<EditorState[]>([]);
 

src/CallBlock.tsx

@@ -1,12 +1,12 @@
-import { apply, getType, getInst, assignFn, UnifyError } from "dope2";
-import type { Dynamic, State2Props } from "./util/extra";
+import { useState } from "react";
+
+import { apply, UnifyError } from "dope2";
+
 import { Editor, type EditorState } from "./Editor";
+import { Value } from "./Value";
+import type { Dynamic, State2Props } from "./util/extra";
 
 import "./CallBlock.css";
-import { useEffect, useState } from "react";
-import { Type } from "./Type";
-import { Value } from "./Value";
-import { focusPrevElement } from "./util/dom_trickery";
 
 export interface CallBlockState<
   FnState=EditorState,
@@ -110,11 +110,17 @@ export function CallBlock({ state, setState, onResolve }: CallBlockProps) {
   const {unifyError, setFn, setInput, onFnResolve, onInputResolve, onFnCancel, onInputCancel}
     = headlessCallBlock({ state, setState, onResolve });
   return <span className={"functionBlock" + (unifyError ? " unifyError" : "")}>
-    <FunctionHeader fn={state.fn}/>
+    <FunctionHeader
+      fn={state.fn}
+      setFn={setFn}
+      onFnResolve={onFnResolve} />
     <div className="functionParams">
       <div className="outputParam">
         {/* Sequence of input parameters */}
-        <InputParams fn={state.fn} input={state.input} setInput={setInput}
+        <InputParams
+          fn={state.fn}       setFn={setFn}
+          input={state.input} setInput={setInput}
+          onFnResolve={onFnResolve}
           onInputResolve={onInputResolve} onInputCancel={onInputCancel} />
           
         {/* Output (or Error) */}
@@ -125,25 +131,39 @@ export function CallBlock({ state, setState, onResolve }: CallBlockProps) {
   </span>;
 }
 
-function FunctionHeader({ fn }) {
+function FunctionHeader({ fn, setFn, onFnResolve }) {
   if (fn.kind === "call") {
     // if the function we're calling is itself the result of a function call,
     // then we are anonymous, and so we don't draw a function name
 
     // recurse:
-    return <FunctionHeader fn={fn.fn} />;
+    const {
+      onFnResolve   : onFnFnResolve
+    } = headlessCallBlock({state: fn, setState: setFn, onResolve: onFnResolve});
+
+    return <FunctionHeader
+      fn={fn.fn}
+      setFn={fnFn => setFn({...fn, fn: fnFn})}
+      onFnResolve={onFnFnResolve} />;
   }
   else {
     //  end of recursion - draw function name
     return <div className="functionName">
       &#119891;&#119899;&nbsp;
-      <Editor state={fn} setState={() => {/*todo*/}}
-        onResolve={() => {}} onCancel={() => {/*todo*/}}/>
+      <Editor
+        state={fn}
+        setState={setFn}
+        onResolve={onFnResolve}
+        onCancel={() => {/*todo*/}}/>
     </div>;
   }
 }
 
-function InputParams({ fn, input, setInput, onInputResolve, onInputCancel }) {
+function InputParams({ fn, setFn, input, setInput, onFnResolve, onInputResolve, onInputCancel }) {
+  const {
+    onInputResolve: onFnInputResolve,
+    onFnResolve   : onFnFnResolve
+  } = headlessCallBlock({state: fn, setState: setFn, onResolve: onFnResolve});
   return <div className="inputParam">
     {(fn.kind === "call") &&
       // if the function we're calling is itself the result of a function call,
@@ -152,9 +172,11 @@ function InputParams({ fn, input, setInput, onInputResolve, onInputCancel }) {
       // Input(s) of the function we're calling:
       <InputParams
         fn={fn.fn}
+        setFn={fnFn => setFn({...fn, fn: fnFn})}
         input={fn.input}
-        setInput={() => {/*todo*/}}
-        onInputResolve={() => {/*todo*/}}
+        setInput={fnInput => setFn({...fn, input: fnInput})}
+        onFnResolve={onFnFnResolve}
+        onInputResolve={onFnInputResolve}
         onInputCancel={() => {/*todo*/}}/>
     }