initial version of a sdk issue triage bot (#264)

* initial version of a sdk issue triage bot

* update help message, prompts

* adjust prompts and diagnostic stdout output

* Update pkgs/sdk_triage_bot/lib/src/common.dart

Co-authored-by: Moritz <mosum@google.com>

* update the classify method type sig

* regenerate the mono_repo settings

* adjust the format of the github comment

* Update .gitignore

* Apply suggestions from code review

Co-authored-by: Nate Bosch <nbosch@google.com>

* rename 'getIssue' to 'fetchIssue'

* remove extra interfaces

---------

Co-authored-by: Moritz <mosum@google.com>
Co-authored-by: Nate Bosch <nbosch@google.com>

pkgs/sdk_triage_bot/.gitignore

@@ -0,0 +1,11 @@
+# https://dart.dev/guides/libraries/private-files
+
+# Created by `dart pub`
+.dart_tool/
+pubspec.lock
+
+.env
+
+tool/training.csv
+tool/training.jsonl
+tool/training.txt

pkgs/sdk_triage_bot/README.md

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+## What's this?
+
+A LLM based triage automation system for the dart-lang/sdk repo. It processes
+new issues filed against the repo and triages them in the same manner that a
+human would. This includes:
+
+- re-summarizing the issue for clarity
+- assigning the issues to an `area-` label (first line triage)
+
+## Bot trigger and entry-point
+
+TODO: doc
+
+## Overview
+
+TODO: doc
+
+## Tuning
+
+TODO: doc

pkgs/sdk_triage_bot/analysis_options.yaml

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+include: package:dart_flutter_team_lints/analysis_options.yaml

pkgs/sdk_triage_bot/bin/triage.dart

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+// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:io' as io;
+
+import 'package:args/args.dart';
+import 'package:github/github.dart';
+import 'package:http/http.dart' as http;
+import 'package:sdk_triage_bot/src/common.dart';
+import 'package:sdk_triage_bot/src/gemini.dart';
+import 'package:sdk_triage_bot/src/github.dart';
+import 'package:sdk_triage_bot/triage.dart';
+
+void main(List<String> arguments) async {
+  final argParser = ArgParser();
+  argParser.addFlag('dry-run',
+      negatable: false,
+      help: 'Perform triage but don\'t make any actual changes to the issue.');
+  argParser.addFlag('force',
+      negatable: false,
+      help: 'Make changes to the issue even if it already looks triaged.');
+  argParser.addFlag('help',
+      abbr: 'h', negatable: false, help: 'Print this usage information.');
+
+  final ArgResults results;
+  try {
+    results = argParser.parse(arguments);
+  } on ArgParserException catch (e) {
+    print(e.message);
+    print('');
+    print(usage);
+    print('');
+    print(argParser.usage);
+    io.exit(64);
+  }
+
+  if (results.flag('help') || results.rest.isEmpty) {
+    print(usage);
+    print('');
+    print(argParser.usage);
+    io.exit(results.flag('help') ? 0 : 64);
+  }
+
+  var issue = results.rest.first;
+  final dryRun = results.flag('dry-run');
+  final force = results.flag('force');
+
+  // Accept either an issue number or a url (i.e.,
+  // https://github.com/dart-lang/sdk/issues/55816).
+  const sdkToken = 'dart-lang/sdk/issues/';
+  if (issue.contains(sdkToken)) {
+    issue = issue.substring(issue.indexOf(sdkToken) + sdkToken.length);
+  }
+
+  final client = http.Client();
+
+  final github = GitHub(
+    auth: Authentication.withToken(githubToken),
+    client: client,
+  );
+  final githubService = GithubService(github: github);
+
+  final geminiService = GeminiService(
+    apiKey: geminiKey,
+    httpClient: client,
+  );
+
+  await triage(
+    int.parse(issue),
+    dryRun: dryRun,
+    force: force,
+    githubService: githubService,
+    geminiService: geminiService,
+  );
+
+  client.close();
+}
+
+const String usage = '''
+A tool to triage issues from https://github.com/dart-lang/sdk.
+
+usage: dart bin/triage.dart [options] <issue>''';

pkgs/sdk_triage_bot/lib/src/common.dart

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+// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:io';
+
+String? _envFileTokenOrEnvironment({required String key}) {
+  final envFile = File('.env');
+  if (envFile.existsSync()) {
+    final env = <String, String>{};
+    for (var line in envFile.readAsLinesSync().map((line) => line.trim())) {
+      if (line.isEmpty || line.startsWith('#')) continue;
+      var split = line.indexOf('=');
+      env[line.substring(0, split).trim()] = line.substring(split + 1).trim();
+    }
+    return env[key];
+  } else {
+    return Platform.environment[key];
+  }
+}
+
+String get githubToken {
+  var token = _envFileTokenOrEnvironment(key: 'GITHUB_TOKEN');
+  if (token == null) {
+    throw StateError('This tool expects a github access token in the '
+        'GITHUB_TOKEN environment variable.');
+  }
+  return token;
+}
+
+String get geminiKey {
+  var token = _envFileTokenOrEnvironment(key: 'GOOGLE_API_KEY');
+  if (token == null) {
+    throw StateError('This tool expects a gemini api key in the '
+        'GOOGLE_API_KEY environment variable.');
+  }
+  return token;
+}
+
+/// Don't return more than 4k of text for an issue body.
+String trimmedBody(String body) {
+  return body.length > 4096 ? body = body.substring(0, 4096) : body;
+}