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✨ Add editable thoughts canvas layout #55

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0a87cac
✨ Add editable thoughts canvas layout
yuler Jun 8, 2026
00c30e7
💄 Apply format:fix
github-actions[bot] Jun 8, 2026
33e7e7a
🐛 Fix thoughts canvas edit layout safeguards
yuler Jun 8, 2026
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69 changes: 68 additions & 1 deletion astro.config.mjs
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Original file line number Diff line number Diff line change
@@ -1,10 +1,72 @@
import fs from 'node:fs/promises'
import path from 'node:path'
import { fileURLToPath } from 'node:url'
import mdx from '@astrojs/mdx'
import tailwindcss from '@tailwindcss/vite'
import { defineConfig } from 'astro/config'

const __dirname = path.dirname(fileURLToPath(import.meta.url))
const thoughtsCanvasLayoutPath = path.resolve(__dirname, 'src/data/thoughts-canvas-layout.json')

function thoughtsCanvasLayoutDevPlugin() {
return {
name: 'thoughts-canvas-layout-dev',
configureServer(server) {
server.middlewares.use('/__thoughts-canvas-layout', async (req, res, next) => {
if (req.method !== 'POST')
return next()

try {
let body = ''
for await (const chunk of req)
body += chunk
Comment on lines +20 to +22

@gemini-code-assist gemini-code-assist Bot Jun 8, 2026

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medium

When reading from a Node.js readable stream (like req), chunks are emitted as Buffer objects by default. Concatenating them directly to a string (body += chunk) implicitly calls toString() on each chunk. If a multi-byte UTF-8 character happens to be split across a chunk boundary, this can result in encoding corruption.

It is safer to collect the buffers in an array and concatenate them using Buffer.concat() before converting to a string.

Suggested change
let body = ''
for await (const chunk of req)
body += chunk
const chunks = []
for await (const chunk of req)
chunks.push(chunk)
const body = Buffer.concat(chunks).toString('utf8')


const payload = JSON.parse(body)
if (payload?.version !== 1 || typeof payload.cards !== 'object' || payload.cards === null)
throw new Error('Invalid thoughts layout payload')

const cards = {}
for (const [slug, card] of Object.entries(payload.cards)) {
if (
typeof slug !== 'string'
|| typeof card !== 'object'
|| card === null
|| !Number.isFinite(card.x)
|| !Number.isFinite(card.y)
|| !Number.isFinite(card.rotateDeg)
) {
throw new Error(`Invalid card layout for ${slug}`)
}
cards[slug] = {
x: Math.round(card.x * 100) / 100,
y: Math.round(card.y * 100) / 100,
rotateDeg: Math.round(card.rotateDeg * 100) / 100,
}
}

const sortedCards = Object.fromEntries(Object.entries(cards).sort(([a], [b]) => a.localeCompare(b)))
await fs.writeFile(
thoughtsCanvasLayoutPath,
`${JSON.stringify({ version: 1, cards: sortedCards }, null, 2)}\n`,
'utf8',
)

const layoutModules = server.moduleGraph.getModulesByFile(thoughtsCanvasLayoutPath)
layoutModules?.forEach(mod => server.moduleGraph.invalidateModule(mod))

res.statusCode = 200
res.setHeader('Content-Type', 'application/json')
res.end(JSON.stringify({ ok: true, layout: { version: 1, cards: sortedCards } }))
}
catch (err) {
res.statusCode = 400
res.setHeader('Content-Type', 'application/json')
res.end(JSON.stringify({ ok: false, error: err instanceof Error ? err.message : 'Unknown error' }))
}
})
},
}
}

// https://astro.build/config
export default defineConfig({
Expand Down Expand Up @@ -37,7 +99,12 @@ export default defineConfig({
],

vite: {
plugins: [tailwindcss()],
plugins: [tailwindcss(), thoughtsCanvasLayoutDevPlugin()],
server: {
watch: {
ignored: [thoughtsCanvasLayoutPath],
},
},
resolve: {
alias: {
'@': path.resolve(__dirname, 'src'),
Expand Down
25 changes: 25 additions & 0 deletions src/components/icons/RotateCcw.astro
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Original file line number Diff line number Diff line change
@@ -0,0 +1,25 @@
---
interface Props {
class?: string
size?: number
}

const { class: className = '', size = 14 } = Astro.props
---

<svg
xmlns="http://www.w3.org/2000/svg"
width={size}
height={size}
viewBox="0 0 24 24"
fill="none"
stroke="currentColor"
stroke-width="2"
stroke-linecap="round"
stroke-linejoin="round"
class:list={['lucide lucide-rotate-ccw', className]}
aria-hidden="true"
>
<path d="M3 12a9 9 0 1 0 9-9 9.75 9.75 0 0 0-6.74 2.74L3 8"></path>
<path d="M3 3v5h5"></path>
</svg>
25 changes: 25 additions & 0 deletions src/components/icons/RotateCw.astro
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Original file line number Diff line number Diff line change
@@ -0,0 +1,25 @@
---
interface Props {
class?: string
size?: number
}

const { class: className = '', size = 14 } = Astro.props
---

<svg
xmlns="http://www.w3.org/2000/svg"
width={size}
height={size}
viewBox="0 0 24 24"
fill="none"
stroke="currentColor"
stroke-width="2"
stroke-linecap="round"
stroke-linejoin="round"
class:list={['lucide lucide-rotate-cw', className]}
aria-hidden="true"
>
<path d="M21 12a9 9 0 1 1-9-9 9.75 9.75 0 0 1 6.74 2.74L21 8"></path>
<path d="M21 3v5h-5"></path>
</svg>
111 changes: 90 additions & 21 deletions src/components/thoughts/ThoughtsCanvasBottomToolbar.astro
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Original file line number Diff line number Diff line change
@@ -1,9 +1,23 @@
---
import RotateCcw from '@/components/icons/RotateCcw.astro'
import RotateCw from '@/components/icons/RotateCw.astro'

interface Props {
isDev?: boolean
}

const { isDev = false } = Astro.props
---

<div
id="thoughts-canvas-bottom-toolbar"
class="motion-reduce:hidden pointer-events-none fixed inset-x-0 bottom-[max(1.75rem,calc(env(safe-area-inset-bottom)+0.75rem))] z-40 hidden justify-center px-4 max-md:flex md:motion-safe:flex"
data-editable={isDev ? 'true' : 'false'}
class:list={[
'motion-reduce:hidden pointer-events-none fixed inset-x-0 z-40 hidden justify-center px-4 max-md:flex md:motion-safe:flex',
isDev
? 'bottom-[max(4.75rem,calc(env(safe-area-inset-bottom)+4rem))]'
: 'bottom-[max(1.75rem,calc(env(safe-area-inset-bottom)+0.75rem))]',
]}
aria-label="Thoughts canvas controls"
>
<div
Expand Down Expand Up @@ -34,6 +48,59 @@

<div class="mx-0.5 hidden h-5 w-px bg-gray-200/90 sm:block" aria-hidden="true"></div>

{
isDev && (
<>
<div
class="flex items-center gap-0.5 rounded-sm border border-gray-200/80 bg-white/80 px-1 py-0.5"
aria-label="Canvas edit"
>
<button
type="button"
id="thoughts-canvas-edit"
class="cursor-pointer rounded-sm px-2 py-1 text-[11px] text-gray-700 transition-colors hover:bg-gray-100 sm:text-xs"
aria-pressed="false"
>
Edit
</button>
<button
type="button"
id="thoughts-canvas-rotate-left"
class="flex size-8 shrink-0 cursor-pointer items-center justify-center rounded-sm text-sm leading-none text-gray-700 transition-colors hover:bg-gray-100 disabled:cursor-not-allowed disabled:opacity-35"
aria-label="Rotate left"
disabled
>
<RotateCcw />
</button>
<button
type="button"
id="thoughts-canvas-rotate-right"
class="flex size-8 shrink-0 cursor-pointer items-center justify-center rounded-sm text-sm leading-none text-gray-700 transition-colors hover:bg-gray-100 disabled:cursor-not-allowed disabled:opacity-35"
aria-label="Rotate right"
disabled
>
<RotateCw />
</button>
<button
type="button"
id="thoughts-canvas-save"
class="cursor-pointer rounded-sm px-2 py-1 text-[11px] text-gray-700 transition-colors hover:bg-gray-100 disabled:cursor-not-allowed disabled:opacity-35 sm:text-xs"
disabled
>
Save
</button>
<span
id="thoughts-canvas-edit-status"
class="min-w-[3.75rem] select-none px-1 text-gray-500"
aria-live="polite"
></span>
</div>

<div class="mx-0.5 hidden h-5 w-px bg-gray-200/90 sm:block" aria-hidden="true"></div>
</>
)
}

<div
id="thoughts-canvas-zoom-cluster"
class="flex items-center gap-0.5 rounded-sm border border-gray-200/80 bg-white/80 px-1 py-0.5 tabular-nums"
Expand Down Expand Up @@ -77,16 +144,6 @@ function qs<T extends HTMLElement>(sel: string) {
return document.querySelector<T>(sel)
}

function chromeOpts(): ThoughtsCanvasChromeOptions {
return {
zoomOutBtn: qs<HTMLButtonElement>('#thoughts-canvas-zoom-out'),
zoomInBtn: qs<HTMLButtonElement>('#thoughts-canvas-zoom-in'),
zoomLevelEl: qs<HTMLElement>('#thoughts-canvas-zoom-level'),
resetBtn: qs<HTMLButtonElement>('#thoughts-canvas-reset'),
initialScale: window.innerWidth < 1024 ? 0.75 : 1,
}
}

const root = qs<HTMLElement>('#thoughts-root')
const toolbar = qs<HTMLElement>('#thoughts-canvas-bottom-toolbar')
const cardBtn = qs<HTMLButtonElement>('#thoughts-mode-card')
Expand All @@ -99,11 +156,27 @@ const zoomInEl = qs<HTMLButtonElement>('#thoughts-canvas-zoom-in')
const zoomLevelEl = qs<HTMLElement>('#thoughts-canvas-zoom-level')
const resetBtn = qs<HTMLButtonElement>('#thoughts-canvas-reset')

function chromeOpts(): ThoughtsCanvasChromeOptions {
return {
zoomOutBtn: qs<HTMLButtonElement>('#thoughts-canvas-zoom-out'),
zoomInBtn: qs<HTMLButtonElement>('#thoughts-canvas-zoom-in'),
zoomLevelEl: qs<HTMLElement>('#thoughts-canvas-zoom-level'),
resetBtn: qs<HTMLButtonElement>('#thoughts-canvas-reset'),
editBtn: qs<HTMLButtonElement>('#thoughts-canvas-edit'),
rotateLeftBtn: qs<HTMLButtonElement>('#thoughts-canvas-rotate-left'),
rotateRightBtn: qs<HTMLButtonElement>('#thoughts-canvas-rotate-right'),
saveBtn: qs<HTMLButtonElement>('#thoughts-canvas-save'),
editStatusEl: qs<HTMLElement>('#thoughts-canvas-edit-status'),
enableEditing: toolbar?.dataset.editable === 'true',
initialScale: window.innerWidth < 1024 ? 0.75 : 1,
}
}

if (root && toolbar && cardBtn && canvasBtn && viewport && world && zoomCluster && zoomOutEl && zoomInEl && zoomLevelEl && resetBtn) {
let activeCanvas: ReturnType<typeof initThoughtsCanvas> | null = null

const mqDesktopCanvas = window.matchMedia('(min-width: 768px) and (prefers-reduced-motion: no-preference)')
let currentMode: 'canvas' | 'card' = mqDesktopCanvas.matches ? 'canvas' : 'card'
const mqCanvasAllowed = window.matchMedia('(prefers-reduced-motion: no-preference)')
let currentMode: 'canvas' | 'card' = mqCanvasAllowed.matches ? 'canvas' : 'card'

function setModeUi(mode: 'card' | 'canvas') {
const onCanvas = mode === 'canvas'
Expand All @@ -129,8 +202,8 @@ if (root && toolbar && cardBtn && canvasBtn && viewport && world && zoomCluster
}
}

function setViewMode(mode: 'card' | 'canvas') {
if (mode === currentMode)
function setViewMode(mode: 'card' | 'canvas', force = false) {
if (!force && mode === currentMode)
return
currentMode = mode

Expand All @@ -151,14 +224,10 @@ if (root && toolbar && cardBtn && canvasBtn && viewport && world && zoomCluster
cardBtn!.addEventListener('click', () => setViewMode('card'))
canvasBtn!.addEventListener('click', () => setViewMode('canvas'))

mqDesktopCanvas.addEventListener('change', (e) => {
mqCanvasAllowed.addEventListener('change', (e) => {
setViewMode(e.matches ? 'canvas' : 'card')
})

if (currentMode === 'canvas') {
if (!activeCanvas)
activeCanvas = initThoughtsCanvas(viewport!, world!, chromeOpts())
}
setModeUi(currentMode)
setViewMode(currentMode, true)
}
</script>
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