Visual Studio Code snippet generator

main.dart

import 'dart:convert';
import 'dart:io';
import 'package:pure/pure.dart';
import 'package:stream_transform/stream_transform.dart';

typedef Json = Map<String, Object?>;

extension on Directory {
  String get scope => uri.pathSegments.elementAt(1);
}

extension on File {
  String get name => uri.pathSegments.last;
}

extension on String {
  String uppercased() => this[0].toUpperCase() + substring(1);
  String followedBy(String other) => this + other;
}

class SnippetInfo {
  final String scope;
  final String filename;
  final String contents;

  const SnippetInfo({
    required this.scope,
    required this.filename,
    required this.contents,
  });

  String get name => filename
      .split('.')
      .first
      .split('_')
      .join(' ')
      .uppercased()
      .followedBy(' (${scope.uppercased()})');

  Json get json {
    final json = jsonDecode(contents) as Json;

    if (scope.isEmpty || scope == 'global') return json;

    json['scope'] = scope;

    return json;
  }
}

Future<SnippetInfo> extractInfo(String scope, File file) async => SnippetInfo(
      scope: scope,
      filename: file.name,
      contents: await file.readAsString(),
    );

bool isJson(File file) => file.path.endsWith('.json');

Stream<SnippetInfo> extractAllSnippets(Directory scopedDirectory) =>
    scopedDirectory
        .list(recursive: true)
        .whereType<File>()
        .where(isJson)
        .concurrentAsyncMap(extractInfo.curry(scopedDirectory.scope));

Json appendSnippet(Json result, SnippetInfo info) => {
      ...result,
      info.name: info.json,
    };

File get snippetsFile => File('global.code-snippets');

Future<void> writeResult(Json result) =>
    jsonEncode(result).pipe(snippetsFile.writeAsString);

void main(List<String> arguments) => Directory(arguments.first)
    .list()
    .whereType<Directory>()
    .concurrentAsyncExpand(extractAllSnippets)
    .fold<Json>(const {}, appendSnippet).then(writeResult);