👩‍💻 Create a build dart script, add github actions

I want to be able to create usable arifacts quickly, and be able to update versions of dart quickly, so I've added a script to fetch and build dart, and a github action to try to automatically build artifacts

.dart_version

@@ -0,0 +1,2 @@
+# This file contains the current Dart version we build against
+3.0.7

.github/workflows/build.yaml

@@ -0,0 +1,21 @@
+name: Build Dart Shared Library
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+jobs:
+  build_windows:
+    runs-on: [windows-latest]
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dart-lang/setup-dart@v1
+      - uses: ilammy/msvc-dev-cmd@v1
+      - uses: threal/cmake-action@v1
+      - run: dart pub get
+        working-directory: ./scripts/build_helpers
+      - name: Build Dart
+        run: dart ./scripts/build_helpers/bin/build_dart.dart
+      - name: Build Shared Library
+        run: cmake -B .\.build . && cmake --build .\.build --config release
+

.vscode/settings.json

@@ -0,0 +1,8 @@
+{
+    "files.exclude": {
+        "**/.git": true,         // this is a default value
+        "**/.DS_Store": true,    // this is a default value
+
+        "dart-sdk/": true
+    }
+}

README.md

@@ -8,9 +8,8 @@ The hope is that the the dynamic library will eventually support the following t
 * A "Fully Featured" .dll / .so that supports booting Dart in different configurations:
   * Boot (or not) the service and kernel isolates
   * Support Dart Source Compilation and / or Kernel Isolates
-  * Support "AOT only" mode? (aka, just the runtime)
-* A JIT Only .dll / .so
-* A AOT Only .dll / .so (aka, just the runtime)
+  * JIT from source or .dil
+* An AOT Only .dll / .so
 
 Additionally we may have a static target that uses the same interface as the dynamic library, so the VM can be embedded on platforms that don't support dynamic linking.
 

scripts/build_helpers/.gitignore

@@ -0,0 +1,3 @@
+# https://dart.dev/guides/libraries/private-files
+# Created by `dart pub`
+.dart_tool/

scripts/build_helpers/CHANGELOG.md

@@ -0,0 +1,3 @@
+## 1.0.0
+
+- Initial version.

scripts/build_helpers/analysis_options.yaml

@@ -0,0 +1,25 @@
+# This file configures the static analysis results for your project (errors,
+# warnings, and lints).
+#
+# This enables the 'recommended' set of lints from `package:lints`.
+# This set helps identify many issues that may lead to problems when running
+# or consuming Dart code, and enforces writing Dart using a single, idiomatic
+# style and format.
+#
+# If you want a smaller set of lints you can change this to specify
+# 'package:lints/core.yaml'. These are just the most critical lints
+# (the recommended set includes the core lints).
+# The core lints are also what is used by pub.dev for scoring packages.
+
+include: package:lints/recommended.yaml
+
+# Uncomment the following section to specify additional rules.
+
+linter:
+  rules:
+    - camel_case_types
+    - prefer_relative_imports
+
+# analyzer:
+#   exclude:
+#     - path/to/excluded/files/**

scripts/build_helpers/bin/build_dart.dart

@@ -0,0 +1,162 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:args/args.dart';
+import 'package:build_helpers/build_helpers.dart';
+import 'package:logger/logger.dart';
+import 'package:path/path.dart' as path;
+
+void main(List<String> args) async {
+  final parser = ArgParser();
+  parser.addFlag('verbose', abbr: 'v');
+
+  final argResults = parser.parse(args);
+  Level logLevel = Level.info;
+  if (argResults['verbose'] == true) {
+    logLevel = Level.debug;
+  }
+
+  if (!checkRightDirectory()) {
+    // Not run from root. Exit.
+    exit(-1);
+  }
+
+  if (Platform.isWindows) {
+    final depotToolsEnv = Platform.environment['DEPOT_TOOLS_WIN_TOOLCHAIN'];
+    if (depotToolsEnv == null) {
+      BuildToolsLogger.shared.e(
+          'DEPOT_TOOLS_WIN_TOOOLCHAIN not set! Run ./setup_env.ps1 before running this script!');
+      exit(-1);
+    }
+  }
+
+  BuildToolsLogger.initLogger(logLevel: logLevel);
+  if (!await checkForDepotTools()) {
+    if (!await getDepotTools()) {
+      // Fatal. Can't do this without depot_tools
+      exit(-1);
+    }
+  }
+
+  try {
+    if (!await _fetchOrUpdateDartSdk()) {
+      exit(-1);
+    }
+
+    if (!await _patchDartSdk()) {
+      exit(-1);
+    }
+
+    if (!await _buildDart()) {
+      exit(-1);
+    }
+  } catch (e) {
+    BuildToolsLogger.shared.f('Caught an exception building the Dart SDK:');
+    BuildToolsLogger.shared.f(e);
+    exit(-1);
+  }
+}
+
+Future<bool> _fetchOrUpdateDartSdk() async {
+  final logger = BuildToolsLogger.shared;
+  final dartVersion = await _fetchRequestedDartVersion();
+
+  if (!Directory('dart-sdk').existsSync()) {
+    logger.i('dart-sdk does not exist. Doing full fetch');
+
+    Directory('dart-sdk').create();
+
+    final fetchResult = await inDir('dart-sdk', () async {
+      final fetchProcess =
+          await startAppendingDepotToolsPath('fetch', ['--no-history', 'dart']);
+      var fetchResult = await waitForProcessFinish(fetchProcess);
+      return fetchResult;
+    });
+    if (fetchResult != 0) return false;
+  }
+
+  final finalResult = await inDir(path.join('dart-sdk', 'sdk'), () async {
+    logger.i('Checking out tag $dartVersion');
+    final fetchProcess = await Process.start(
+      'git',
+      ['fetch', 'origin', 'refs/tags/$dartVersion:refs/tags/$dartVersion'],
+      runInShell: true,
+    );
+    var fetchResult = await waitForProcessFinish(fetchProcess);
+    if (fetchResult != 0) return fetchResult;
+
+    final checkoutProcess = await Process.start(
+      'git',
+      ['checkout', '-f', 'tags/$dartVersion'],
+      runInShell: true,
+    );
+    var checkoutResult = await waitForProcessFinish(checkoutProcess);
+    if (checkoutResult != 0) return checkoutResult;
+
+    logger.i('Performing `gclient sync -D --no-history');
+    final syncProcess = await Process.start(
+      'gclient',
+      ['sync', '-D', '--no-history'],
+      runInShell: true,
+    );
+    var syncResult = await waitForProcessFinish(syncProcess);
+    if (syncResult != 0) return syncResult;
+
+    return 0;
+  });
+
+  return finalResult == 0;
+}
+
+Future<String> _fetchRequestedDartVersion() async {
+  final lines = await File('.dart_version').readAsLines();
+  for (var line in lines) {
+    if (line.startsWith('#')) {
+      continue;
+    }
+
+    return line;
+  }
+  throw Exception('Only found comments in the `.dart_version` file!');
+}
+
+Future<bool> _patchDartSdk() async {
+  final logger = BuildToolsLogger.shared;
+  final result = await inDir('dart-sdk/sdk', () async {
+    logger.i("Patching the Dart SDK to create libdart");
+    var result = await Process.run('git', ['apply', '../../dart_sdk.patch'],
+        runInShell: true);
+    logger.d(result.stdout);
+    return result.exitCode;
+  });
+  if (result != 0) {
+    logger.f('Failed to apply patch.');
+  }
+
+  return result == 0;
+}
+
+Future<bool> _buildDart() async {
+  final logger = BuildToolsLogger.shared;
+  final result = await inDir('dart-sdk/sdk', () async {
+    logger.i("Building libdart");
+    var script = './tools/build.py';
+    var args = ['--no-goma', '-m', 'release', 'libdart'];
+    var command = script;
+    if (Platform.isWindows) {
+      command = 'python';
+      args.insert(0, script);
+    }
+    final buildProcess = await Process.start(
+      command,
+      args,
+      runInShell: true,
+    );
+    var buildResult = await waitForProcessFinish(buildProcess);
+    return buildResult;
+  });
+  if (result != 0) {
+    logger.f('Failed to build dart.');
+  }
+  return result == 0;
+}

scripts/build_helpers/lib/build_helpers.dart

@@ -0,0 +1,81 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:logger/logger.dart';
+import 'package:path/path.dart' as path;
+
+export 'depot_tools.dart';
+
+class BuildToolsLogger {
+  static Logger? _shared;
+  static Logger get shared {
+    _shared ??= initLogger();
+    return _shared!;
+  }
+
+  static Logger initLogger({Level logLevel = Level.info}) {
+    return Logger(
+      filter: ProductionFilter(),
+      level: logLevel,
+      printer: SimplePrinter(),
+    );
+  }
+}
+
+bool checkRightDirectory() {
+  final logger = BuildToolsLogger.shared;
+
+  final currentDir = Directory.current;
+  // Check if the .dart_version and the patch file are there.
+  if (!File(path.join(currentDir.path, '.dart_version')).existsSync()) {
+    logger.f(
+        'Could not find `.dart_version`. Make sure you\'re running from the root of the `dart_dll` repo.');
+    return false;
+  }
+
+  if (!File(path.join(currentDir.path, 'dart_sdk.patch')).existsSync()) {
+    logger.f(
+        'Could not find `dart_sdk.pathch`. Make sure you\'re running from the root of the `dart_dll` repo.');
+    return false;
+  }
+
+  return true;
+}
+
+// Waits for the process to finish, outputting output to the BuildToolsLogger
+Future<int> waitForProcessFinish(Process process) async {
+  final logger = BuildToolsLogger.shared;
+  final stdoutCompleter = Completer();
+  final stderrCompleter = Completer();
+
+  process.stdout.transform(utf8.decoder).transform(const LineSplitter()).listen(
+    (l) {
+      logger.i(l);
+    },
+  ).onDone(() {
+    stdoutCompleter.complete();
+  });
+
+  process.stderr.transform(utf8.decoder).transform(const LineSplitter()).listen(
+    (l) {
+      logger.i(l);
+    },
+  ).onDone(() {
+    stderrCompleter.complete();
+  });
+
+  var exitCode = await process.exitCode;
+
+  await (Future.wait([stdoutCompleter.future, stderrCompleter.future]));
+
+  return exitCode;
+}
+
+Future<T> inDir<T>(String directory, Future<T> Function() callback) async {
+  final oldDir = Directory.current;
+  Directory.current = Directory(directory);
+  final result = await callback();
+  Directory.current = oldDir;
+  return result;
+}