@template-tools/template-sync/src/mergers/replace-if-empty.mjs

Keep repository in sync with its template

import { StringContentEntry } from "content-entry";
import { Merger } from "../merger.mjs";

/**
 * Overwrites none existing entries from template.
 */
export class ReplaceIfEmpty extends Merger {
  static get priority() {
    return 0.1;
  }

  static async *commits(
    context,
    destinationEntry,
    sourceEntry,
    options = this.options
  ) {
    if (await destinationEntry.isEmpty) {
      const source = await sourceEntry.string;

      if (source.length > 0) {
        yield {
          message: `${options.messagePrefix}add missing ${destinationEntry.name} from template`,
          entries: [
            new StringContentEntry(
              destinationEntry.name,
              undefined,
              context.expand(source, options.expand)
            )
          ]
        };
      }
    }
  }
}