http.md/src/cli/ui/ui.tsx

import { Box, render, Text, useApp, useInput } from "ink"
import { ScrollableMarkdown } from './components/scrollable-markdown.js';
import { useStateValue, State, StateProvider } from './state/state.js';
import { useEffect, useState } from "react";
import { useTerminalHeight } from "./hooks/terminal.js";

const MarkdownView = () => {
  const markdown = useStateValue((state) => state.markdown);
  const error = useStateValue((state) => state.error);

  return (
    <Box flexGrow={1} flexDirection="column">
      <Box flexDirection="column" flexGrow={1} overflow="hidden">
        <ScrollableMarkdown markdownContent={markdown} />
      </Box>
      {error && (
        <Box flexDirection="column" padding={1}>
          <Text color="red">{error}</Text>
        </Box>
      )}
    </Box>
  );
}

const App = () => {
  const { exit } = useApp();
  const height = useTerminalHeight();
  useInput((_input, key) => {
    if (key.escape) {
      process.exit(0);
    }
  });
  useEffect(
    () => {
      const enterAltScreenCommand = "\x1b[?1049h";
      const leaveAltScreenCommand = "\x1b[?1049l";
      process.stdout.write(enterAltScreenCommand);
      const onExit = () => {
        exit();
        process.stdout.write(leaveAltScreenCommand);
      }
      process.on("exit", onExit);
      return () => {
        process.stdout.write(leaveAltScreenCommand);
        process.off("exit", onExit);
      }
    }, []
  );

  return (
    <Box height={height} flexDirection="column">
      <MarkdownView />
      <Box>
        <Text>Press esc to exit</Text>
      </Box>
    </Box>
  )
}

const renderUI = (state: State) => {

  render(
    <StateProvider state={state}>
      <App />
    </StateProvider>
  );
}

export { renderUI, State }