@milkdown/plugin-indent/lib/index.js

The indent plugin of [milkdown](https://milkdown.dev/).

import { TextSelection, AllSelection } from "@milkdown/prose/state";
import { $ctx, $shortcut } from "@milkdown/utils";
function updateIndent(tr, options) {
  const { doc, selection } = tr;
  if (!doc || !selection) return tr;
  if (!(selection instanceof TextSelection || selection instanceof AllSelection))
    return tr;
  const { to } = selection;
  const text = options.type === "space" ? Array(options.size).fill(" ").join("") : "	";
  return tr.insertText(text, to);
}
const indentConfig = $ctx(
  { type: "space", size: 2 },
  "indentConfig"
);
indentConfig.meta = {
  package: "@milkdown/plugin-indent",
  displayName: "Ctx<indentConfig>"
};
const indentPlugin = $shortcut((ctx) => ({
  Tab: (state, dispatch) => {
    const config = ctx.get(indentConfig.key);
    const { tr } = state;
    const _tr = updateIndent(tr, config);
    if (_tr.docChanged) {
      dispatch?.(_tr);
      return true;
    }
    return false;
  }
}));
indentPlugin.meta = {
  package: "@milkdown/plugin-indent",
  displayName: "Shortcut<indent>"
};
const indent = [indentConfig, indentPlugin];
export {
  indent,
  indentConfig,
  indentPlugin
};
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