feat: 🎸 make inline sync plugin support global nodes

packages/preset-commonmark/src/plugin/inline-sync/config.ts

@@ -0,0 +1,56 @@
+/* Copyright 2021, Milkdown by Mirone. */
+import { createSlice, Ctx } from '@milkdown/core';
+import { Node, NodeType } from '@milkdown/prose/model';
+import { Transaction } from '@milkdown/prose/state';
+
+import { swap } from './utils';
+
+export type ShouldSyncNode = (context: {
+    prevNode: Node;
+    nextNode: Node;
+    ctx: Ctx;
+    tr: Transaction;
+    text: string;
+}) => boolean;
+
+export type SyncNodePlaceholder = {
+    hole: string;
+    punctuation: string;
+    char: string;
+};
+
+export type InlineSyncConfig = {
+    placeholderConfig: SyncNodePlaceholder;
+    shouldSyncNode: ShouldSyncNode;
+    globalNodes: Array<NodeType | string>;
+    movePlaceholder: (placeholderToMove: string, text: string) => string;
+};
+
+export const defaultConfig: InlineSyncConfig = {
+    placeholderConfig: {
+        hole: '∅',
+        punctuation: '⁂',
+        char: '∴',
+    },
+    globalNodes: ['footnote_definition'],
+    shouldSyncNode: ({ prevNode, nextNode }) =>
+        prevNode.inlineContent &&
+        nextNode &&
+        // if node type changes, do not sync
+        prevNode.type === nextNode.type &&
+        // if two node fully equal, we don't modify them
+        !prevNode.eq(nextNode),
+    movePlaceholder: (placeholderToMove: string, text: string) => {
+        const symbolsNeedToMove = ['*', '_'];
+
+        let index = text.indexOf(placeholderToMove);
+        while (symbolsNeedToMove.includes(text[index - 1] || '') && symbolsNeedToMove.includes(text[index + 1] || '')) {
+            text = swap(text, index, index + 1);
+            index = index + 1;
+        }
+
+        return text;
+    },
+};
+
+export const inlineSyncConfigCtx = createSlice<InlineSyncConfig, 'inlineSyncConfig'>(defaultConfig, 'inlineSyncConfig');