Draw in the interface with a mod

await $.ui.open({ id: 'hello-tabs', title: 'Hello tabs', focus: true })

await $.ui.close({ id: 'hello-tabs' })

// The value that means "use the terminal's default color"
const DEFAULT_COLOR = 0x01000000

// Pack rows of [character, color] pairs into the one string a Raster takes
// One cell is three numbers: the character's code point, its color, and its background
function cellsOf(rows) {
  const numbers = rows.flat().flatMap(([char, color]) => [char.codePointAt(0), color, DEFAULT_COLOR])
  return new Uint8Array(Uint32Array.from(numbers).buffer).toBase64()
}

on('ui.render', { component: 'Pane' }, async ($, e, next) => {
  // Draw only in the pane opened with the id 'heat'
  if (e.requestId !== 'heat') return next(e)
  const { Box, Text, Raster } = $.ui.resolve(e)
  // Two rows of three cells, each a block character and its color
  const rows = [
    [['█', 0x2e7d32], ['█', 0xf9a825], ['█', 0xc62828]],
    [['█', 0x2e7d32], ['█', 0x2e7d32], ['█', 0xf9a825]],
  ]
  if (e.surface !== 'terminal') {
    return Text({ children: ['The heat map needs the terminal.'] })
  }
  return Box({
    flexDirection: 'column',
    children: [Raster({ key: 'grid', columns: 3, rows: 2, cells: cellsOf(rows) })],
  })
})

╭──────────────────────────────────────────────────────────╮
│ Note: Type a note and press Enter ⏎ add                ✕ │
│ x buy milk                                               │
│ x call bob                                               │
╰──────────────────────────────────────────────────────────╯

// The list the pane draws
let notes = []

on('ui.render', { component: 'Pane' }, async ($, e, next) => {
  // Draw only in the pane opened with the id 'notes'
  if (e.requestId !== 'notes') return next(e)
  const { Box, Text, Button, Input } = $.ui.resolve(e)
  const redraw = () => $.ui.invalidate('ui.render')

  return Box({
    flexDirection: 'column',
    children: [
      Input({
        key: 'new-note',
        label: 'Note',
        placeholder: 'Type a note and press Enter',
        // Draw the field empty each time, which clears it after a submit
        value: '',
        submitLabel: 'add',
        autoFocus: true,
        // Runs when you press Enter in the field
        onSubmit: async (value) => {
          // Ignore an empty line
          if (!value.trim()) return
          notes = [...notes, value.trim()]
          redraw()
          await $.store.set('notes', notes)
        },
      }),
      // One row for each note: a delete button, then the note's text
      ...notes.map((note, i) =>
        Box({
          flexDirection: 'row',
          columnGap: 1,
          children: [
            Button({
              // A key of its own, so each row's button can be told apart
              key: 'delete-' + i,
              label: 'x',
              plain: true,
              onPress: async () => {
                notes = notes.filter((_, j) => j !== i)
                redraw()
                await $.store.set('notes', notes)
              },
            }),
            Text({ children: [note] }),
          ],
        }),
      ),
    ],
  })
})

let count = 0

on('ui.render', { component: 'Pane' }, async ($, e, next) => {
  if (e.requestId !== 'counter') return next(e)
  const { Box, Text, Button } = $.ui.resolve(e)
  return Box({
    flexDirection: 'row',
    columnGap: 2,
    children: [
      Button({
        key: 'more',
        label: 'Add one',
        onPress: () => {
          count += 1
          // The data changed, so ask Claude Code to draw the pane again
          $.ui.invalidate('ui.render')
        },
      }),
      Text({ children: ['Count: ' + count] }),
    ],
  })
})

on('session.start', async ($, e, next) => {
  // Every 1000 milliseconds, ask Claude Code to draw your sites again
  $.clock.every(1000, () => $.ui.invalidate('ui.render'))
  return next(e)
})

import { atom, read, update } from 'claude-code'

// At the top of the module: name the value and give its default
const count = atom({ plugin: 'hello-tabs', key: 'count' }, 0)

// In the ui.render hook: read the value to draw it
const n = await read($, count)

// In a Button: write a new value from the old one
onPress: () => update($, count, (value) => value + 1)

// Copy the saved count from $.store into $.state, or 0 if nothing is saved
async function loadCount($) {
  const saved = Number((await $.store.get('count')) ?? 0)
  await update($, count, () => saved)
}

// Runs before your first prompt, and again after a reload
on('session.start', async ($, e, next) => {
  await loadCount($)
  return next(e)
})

// Runs again after /clear, /resume, and /branch, which reports fork
on('classic.SessionStart', { source: ['clear', 'resume', 'fork'] }, async ($, e, next) => {
  await loadCount($)
  return next(e)
})

onPress: async () => {
  // Read what the store holds now, which another session may have changed
  const saved = Number((await $.store.get('count')) ?? 0)
  // Save the new count, then show it
  await $.store.set('count', saved + 1)
  await update($, count, () => saved + 1)
}