refactor(editor): migrate to ProseMirror Mark-based ghost text system
- Replace overlay-based GhostTextOverlay.vue with ProseMirror Mark system - Add AI toggle button with enable/disable functionality - Implement new copilotPlugin.ts using copilotGhostMark for inline suggestions - Fix cursor position offset in prompt.py by moving first suffix char to prefix - Improve API error handling with abort signal support and debug logging - Update model configuration from gpt-oss:120b to gpt-oss:20b - Add button tooltips and improve editor styling - Remove deprecated inlineSuggestionPlugin.ts - Update README with new architecture diagram and feature documentation
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234
src/plugins/copilotPlugin.ts
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234
src/plugins/copilotPlugin.ts
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import { Plugin, PluginKey, Selection } from '@milkdown/prose/state'
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import { $prose, $ctx, $markSchema } from '@milkdown/kit/utils'
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import type { Ctx } from '@milkdown/kit/core'
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import type { EditorView } from '@milkdown/prose/view'
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const COPILOT_PLUGIN_KEY = new PluginKey('milkdown-copilot')
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const DEBOUNCE_MS = 500
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let enabled = true
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interface CopilotState {
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from: number
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to: number
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suggestion: string
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}
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interface CopilotConfig {
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fetchSuggestion: (prefix: string, suffix: string, signal?: AbortSignal) => Promise<string>
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debounceMs?: number
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}
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const initialState: CopilotState = {
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from: 0,
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to: 0,
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suggestion: ''
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}
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export const copilotConfigCtx = $ctx<CopilotConfig, 'copilotConfig'>({
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fetchSuggestion: async () => '',
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debounceMs: DEBOUNCE_MS
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}, 'copilotConfig')
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export const copilotGhostMark = $markSchema('copilot_ghost', () => ({
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excludes: '_',
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inclusive: true,
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parseDOM: [{ tag: 'span[data-copilot-ghost]' }],
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toDOM: () => ['span', { 'data-copilot-ghost': '', class: 'copilot-ghost-text' }, 0]
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}))
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let debounceTimer: ReturnType<typeof setTimeout> | null = null
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let abortController: AbortController | null = null
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let currentCtx: Ctx | null = null
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function clearGhostText(view: EditorView) {
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const state = COPILOT_PLUGIN_KEY.getState(view.state)
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if (state && state.suggestion && state.from < state.to) {
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const tr = view.state.tr
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.delete(state.from, state.to)
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.setMeta(COPILOT_PLUGIN_KEY, { ...initialState })
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view.dispatch(tr)
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}
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}
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function insertGhostText(view: EditorView, suggestion: string, from: number) {
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if (!currentCtx || !suggestion) return
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const schema = view.state.schema
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const markType = schema.marks.copilot_ghost
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if (!markType) {
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console.error('[Copilot] copilot_ghost mark not found in schema')
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return
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}
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const tr = view.state.tr
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tr.insertText(suggestion, from)
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const endPos = from + suggestion.length
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tr.addMark(from, endPos, markType.create())
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tr.setMeta(COPILOT_PLUGIN_KEY, { from, to: endPos, suggestion })
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view.dispatch(tr)
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}
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function doFetchSuggestion(view: EditorView, pos: number, prefix: string, suffix: string) {
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if (!currentCtx) return
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const config = currentCtx.get(copilotConfigCtx.key)
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if (abortController) {
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abortController.abort()
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abortController = null
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}
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abortController = new AbortController()
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config.fetchSuggestion(prefix, suffix, abortController.signal)
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.then(suggestion => {
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if (view.state.selection.from !== pos) return
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if (suggestion) {
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insertGhostText(view, suggestion, pos)
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}
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})
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.catch(e => {
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if (e.name !== 'AbortError') {
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console.error('[Copilot] Error:', e)
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}
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})
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.finally(() => {
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abortController = null
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})
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}
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function scheduleFetch(view: EditorView, pos: number, prefix: string, suffix: string) {
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if (!enabled) return
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if (debounceTimer) {
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clearTimeout(debounceTimer)
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debounceTimer = null
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}
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debounceTimer = setTimeout(() => {
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debounceTimer = null
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doFetchSuggestion(view, pos, prefix, suffix)
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}, DEBOUNCE_MS)
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}
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function acceptSuggestion(view: EditorView) {
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const state = COPILOT_PLUGIN_KEY.getState(view.state)
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if (!state?.suggestion || state.from >= state.to) return false
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const tr = view.state.tr.removeMark(state.from, state.to, view.state.schema.marks.copilot_ghost)
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const endPos = Math.min(state.to, tr.doc.content.size)
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tr.setSelection(Selection.near(tr.doc.resolve(endPos)))
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tr.setMeta(COPILOT_PLUGIN_KEY, { ...initialState })
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view.dispatch(tr)
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return true
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}
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function rejectSuggestion(view: EditorView) {
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const state = COPILOT_PLUGIN_KEY.getState(view.state)
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if (!state?.suggestion) return false
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clearGhostText(view)
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return true
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}
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export const copilotPlugin = $prose((ctx) => {
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currentCtx = ctx
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return new Plugin<CopilotState>({
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key: COPILOT_PLUGIN_KEY,
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state: {
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init: () => ({ ...initialState }),
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apply: (tr, value) => {
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const meta = tr.getMeta(COPILOT_PLUGIN_KEY)
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if (meta !== undefined) {
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return meta
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}
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if (tr.docChanged && value.suggestion) {
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return { ...initialState }
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}
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return value
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}
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},
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props: {
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handleKeyDown: (view, event) => {
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const state = COPILOT_PLUGIN_KEY.getState(view.state)
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if (event.key === 'Tab' && state?.suggestion) {
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event.preventDefault()
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return acceptSuggestion(view)
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}
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if (event.key === 'Escape' && state?.suggestion) {
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event.preventDefault()
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return rejectSuggestion(view)
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}
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if (state?.suggestion && event.key !== 'Shift' && event.key !== 'Control' && event.key !== 'Alt' && event.key !== 'Meta') {
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clearGhostText(view)
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}
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return false
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},
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handleClick: (view, pos) => {
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const state = COPILOT_PLUGIN_KEY.getState(view.state)
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if (!state?.suggestion) return false
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if (pos >= state.from && pos < state.to) {
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return acceptSuggestion(view)
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}
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clearGhostText(view)
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return false
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}
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},
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view: () => ({
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update: (view, prevState) => {
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if (view.state.doc.eq(prevState.doc) && view.state.selection.eq(prevState.selection)) {
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return
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}
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const state = COPILOT_PLUGIN_KEY.getState(view.state)
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if (state?.suggestion) {
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return
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}
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if (!view.state.doc.eq(prevState.doc)) {
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const { from, to } = view.state.selection
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if (from !== to) return
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const doc = view.state.doc
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const prefix = doc.textBetween(0, from)
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const suffix = doc.textBetween(to, doc.content.size)
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scheduleFetch(view, from, prefix, suffix)
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}
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}
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})
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})
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})
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export { COPILOT_PLUGIN_KEY }
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export function isCopilotEnabled(): boolean {
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return enabled
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}
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export function setCopilotEnabled(value: boolean): void {
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enabled = value
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if (!value) {
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if (debounceTimer) {
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clearTimeout(debounceTimer)
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debounceTimer = null
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}
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if (abortController) {
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abortController.abort()
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abortController = null
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}
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}
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}
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