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A collaborative coding-agent orchestrator for atproto radl.app
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175// The CodeMirror instance, loaded on demand.//// Kept out of the component for two reasons. The first is the bundle: CodeMirror is a couple of// hundred kilobytes of editor, and a tab that only ever READS a space — which is most of them, and// every signed-out one — must not download it. Everything below is behind one dynamic `import()`,// so the chunk arrives when an editor is first mounted and never before// (`test/browser-bundle.test.mjs` holds that).//// The second is that the assembly is a decision rather than a detail: which extensions are on// decides what the editor DOES, and a keymap that quietly re-binds Enter or swallows Escape is the// classic way a replacement editor breaks a form. So the set is small, explicit, and commented, and// the component above it only wires it to props.
import type { Extension } from '@codemirror/state'import type { EditorView, KeyBinding } from '@codemirror/view'
export interface EditorModules { EditorState: typeof import('@codemirror/state').EditorState Compartment: typeof import('@codemirror/state').Compartment EditorView: typeof import('@codemirror/view').EditorView keymap: typeof import('@codemirror/view').keymap placeholder: typeof import('@codemirror/view').placeholder}
let loading: Promise<EditorModules & { baseExtensions: (options: BaseOptions) => Extension[] }> | undefined
export interface BaseOptions { /** ⌘↵ / Ctrl↵. The composers bind it to their own submit; a card with no default action omits it. */ onSubmit?: (() => void) | undefined}
/** * The browser's writing aids, spelled out so that BOTH halves of the editor behave the same way. * * A textarea has all four on by default; CodeMirror turns all four OFF on its contenteditable * (`spellcheck`, `autocorrect`, `autocapitalize`, `writingsuggestions` in `EditorView.updateAttrs`). * Left to the defaults, a person drafting on a phone would get sentence capitalization while the * fallback is showing and lose it mid-draft the moment the chunk lands — the one thing the swap * exists to prevent. So this is the set, it is applied to the textarea as attributes and to the * editor through `EditorView.contentAttributes` below, and the two are the same object. * * `autocapitalize` is here rather than dropped because on a touch keyboard it is the visible half of * what a person calls autocorrect; `writingsuggestions` is here because a textarea offers predictive * text and a field that stops offering it once an editor loads has changed under the reader. * `translate` and `contenteditable` stay CodeMirror's — those are about the document, not the typing. */export const WRITING_AIDS: Record<string, string> = { spellcheck: 'true', autocorrect: 'on', autocapitalize: 'sentences', writingsuggestions: 'true',}
/** * Load CodeMirror and build the extension set. Cached: the second editor on a page reuses the first * one's modules, and a failed load is retried by the next mount rather than remembered as broken. */export function loadEditor(): Promise<EditorModules & { baseExtensions: (options: BaseOptions) => Extension[] }> { loading ??= build().catch((error: unknown) => { loading = undefined throw error }) return loading}
async function build(): Promise<EditorModules & { baseExtensions: (options: BaseOptions) => Extension[] }> { const [state, view, commands, language, markdownLanguage, highlight] = await Promise.all([ import('@codemirror/state'), import('@codemirror/view'), import('@codemirror/commands'), import('@codemirror/language'), import('@codemirror/lang-markdown'), import('@lezer/highlight'), ])
const { tags } = highlight // Markdown is structure, not syntax: there are no keywords to colour and nothing to look up. What // a writer wants back from an editor is confirmation that what they typed IS a heading, a link, a // fence — so weight and colour say "this is emphasis" and the punctuation that makes it emphasis // recedes. Every colour is a variable the rest of the app already uses, so the editor is the same // object in light and dark and nothing here is a second palette. const style = language.HighlightStyle.define([ { tag: tags.heading, color: 'var(--ink)', fontWeight: '600' }, { tag: tags.strong, color: 'var(--ink)', fontWeight: '600' }, { tag: tags.emphasis, fontStyle: 'italic' }, { tag: tags.strikethrough, textDecoration: 'line-through', color: 'var(--ink-2)' }, { tag: tags.link, color: 'var(--accent)' }, { tag: tags.url, color: 'var(--ink-2)' }, { tag: [tags.monospace, tags.contentSeparator], color: 'var(--ink-2)', fontFamily: 'var(--mono)' }, { tag: tags.quote, color: 'var(--ink-2)' }, { tag: tags.list, color: 'var(--accent)' }, // The `#`, the `**`, the `](`: present, because markdown is text and hiding its punctuation is // how an editor starts lying about what the document says — but quiet. { tag: tags.processingInstruction, color: 'var(--stroke)' }, ])
const theme = view.EditorView.theme({ // The field size, from the stylesheet's token rather than a number here: it is the same box as a // `.ta` and it has to keep being one — including on a touch device, where the token is raised to // 16px so focusing this does not zoom the page (`app.css`, the touch floor). '&': { color: 'var(--ink)', backgroundColor: 'transparent', fontSize: 'var(--field-size)' }, '.cm-content': { fontFamily: 'inherit', lineHeight: '1.5', padding: '8px 10px', caretColor: 'var(--ink)', }, '.cm-line': { padding: '0' }, '&.cm-focused': { outline: 'none' }, '.cm-placeholder': { color: 'var(--ink-2)' }, '.cm-scroller': { fontFamily: 'inherit', overflow: 'auto' }, '&.cm-editor.cm-focused .cm-selectionBackground, .cm-selectionBackground, ::selection': { backgroundColor: 'var(--accent-wash)', }, '.cm-cursor, .cm-dropCursor': { borderLeftColor: 'var(--ink)' }, })
const baseExtensions = (options: BaseOptions): Extension[] => { // Escape LEAVES the field; it never discards what is in it. That is the app's rule for every // field (`keys.ts`), and it has to be stated explicitly here because a textarea got it from the // browser and a contenteditable does not. const local: KeyBinding[] = [ { key: 'Escape', run: (target: EditorView) => { target.contentDOM.blur() return true }, }, ] if (options.onSubmit) { const submit = options.onSubmit local.push({ key: 'Mod-Enter', run: () => { submit() return true }, }) } return [ // Ahead of the defaults, so Escape and ⌘↵ are ours rather than whatever the default map does // with them. Everything else — Enter, Tab, the arrow keys, IME composition — is left to // CodeMirror, which is the whole reason for using it rather than hand-rolling a contenteditable. view.keymap.of(local), // The same reason the keymaps are here: a contenteditable inherits nothing from the browser, // and CodeMirror actively turns the writing aids off. A facet rather than a `setAttribute` on // `contentDOM`, because `updateAttrs()` recomputes the whole default set on every view update // and compares against its own cached values — a hand-written attribute survives only while // nothing makes that comparison unequal, and this is the seam that becomes the cached value. view.EditorView.contentAttributes.of(WRITING_AIDS), view.keymap.of([...commands.defaultKeymap, ...commands.historyKeymap]), commands.history(), view.drawSelection(), view.dropCursor(), view.highlightSpecialChars(), view.EditorView.lineWrapping, // No `codeLanguages`: a fenced block inside a body is quoted code, and loading a grammar per // language a body might mention is exactly the bundle this module exists to keep small. markdownLanguage.markdown({ codeLanguages: [] }), language.syntaxHighlighting(style), theme, ] }
return { EditorState: state.EditorState, Compartment: state.Compartment, EditorView: view.EditorView, keymap: view.keymap, placeholder: view.placeholder, baseExtensions, }}