Merge package:markdown (#1208)

- [x] Move and fix workflow files, labeler.yaml, and badges in the
README.md
- [x] Rev the version of the package, so that pub.dev points to the
correct site
- [x] Add a line to the changelog:
```
* Move to `dart-lang/tools` monorepo.
```

- [x] Add the package to the top-level readme of the monorepo:
```
| [markdown](pkgs/markdown/) | A portable Markdown library written in Dart that can parse Markdown into HTML. | [![pub package](https://img.shields.io/pub/v/markdown.svg)](https://pub.dev/packages/markdown) |
```

- [ ] **Important!** Merge the PR with 'Create a merge commit' (enabling
then disabling the `Allow merge commits` admin setting)
- [x] Update the auto-publishing settings on
https://pub.dev/packages/markdown/admin
- [x] Add the following text to https://github.com/dart-lang/markdown/:'

```
> [!IMPORTANT]  
> This repo has moved to https://github.com/dart-lang/tools/tree/main/pkgs/markdown
```

- [ ] Publish using the autopublish workflow
- [ ] Push tags to GitHub using
```git tag --list 'markdown*' | xargs git push origin```

- [x] Close open PRs in dart-lang/markdown with the following message:

```
Closing as the
[dart-lang/markdown](https://github.com/dart-lang/markdown) repository
is merged into the [dart-lang/tools](https://github.com/dart-lang/tools)
monorepo. Please re-open this PR there!
```
      
- [x] Transfer issues by running
```dart run pkgs/repo_manage/bin/report.dart transfer-issues
--source-repo dart-lang/markdown --target-repo dart-lang/tools
--add-label package:markdown --apply-changes```

- [ ] Archive https://github.com/dart-lang/markdown/


---

- [x] I’ve reviewed the contributor guide and applied the relevant
portions to this PR.

<details>
  <summary>Contribution guidelines:</summary><br>

- See our [contributor
guide](https://github.com/dart-lang/.github/blob/main/CONTRIBUTING.md)
for general expectations for PRs.
- Larger or significant changes should be discussed in an issue before
creating a PR.
- Contributions to our repos should follow the [Dart style
guide](https://dart.dev/guides/language/effective-dart) and use `dart
format`.
- Most changes should add an entry to the changelog and may need to [rev
the pubspec package
version](https://github.com/dart-lang/sdk/blob/main/docs/External-Package-Maintenance.md#making-a-change).
- Changes to packages require [corresponding
tests](https://github.com/dart-lang/.github/blob/main/CONTRIBUTING.md#Testing).

Note that many Dart repos have a weekly cadence for reviewing PRs -
please allow for some latency before initial review feedback.
</details>

.github/ISSUE_TEMPLATE/markdown.md

@@ -0,0 +1,5 @@
+---
+name: "package:markdown"
+about: "Create a bug or file a feature request against package:markdown."
+labels: "package:markdown"
+---

.github/labeler.yml

@@ -72,6 +72,10 @@
   - changed-files:
     - any-glob-to-any-file: 'pkgs/json_rpc_2/**'
 
+'package:markdown':
+  - changed-files:
+    - any-glob-to-any-file: 'pkgs/markdown/**'
+
 'package:mime':
   - changed-files:
     - any-glob-to-any-file: 'pkgs/mime/**'

.github/workflows/health.yaml

@@ -9,6 +9,6 @@ jobs:
     uses: dart-lang/ecosystem/.github/workflows/health.yaml@main
     with:
       ignore_coverage: "**.mock.dart,**.g.dart"
-      ignore_license: "**.mock.dart,**.g.dart,**.mocks.dart"
+      ignore_license: "**.mock.dart,**.g.dart,**.mocks.dart,pkgs/markdown/**"
     permissions:
       pull-requests: write

.github/workflows/markdown.yaml

@@ -0,0 +1,93 @@
+name: package:markdown
+
+on:
+  # Run on PRs and pushes to the default branch.
+  push:
+    branches: [ main ]
+    paths:
+      - '.github/workflows/markdown.yaml'
+      - 'pkgs/markdown/**'
+  pull_request:
+    branches: [ main ]
+    paths:
+      - '.github/workflows/markdown.yaml'
+      - 'pkgs/markdown/**'
+  schedule:
+    - cron: "0 0 * * 0"
+
+env:
+  PUB_ENVIRONMENT: bot.github
+
+
+defaults:
+  run:
+    working-directory: pkgs/markdown/
+
+
+jobs:
+  # Check code formatting and static analysis on a single OS (linux)
+  # against Dart dev.
+  analyze:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        sdk: [dev]
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: dart-lang/setup-dart@e630b99d28a3b71860378cafdc2a067c71107f94
+        with:
+          sdk: ${{ matrix.sdk }}
+      - id: install
+        name: Install dependencies
+        run: dart pub get
+      - name: Check formatting
+        run: dart format --output=none --set-exit-if-changed .
+        if: always() && steps.install.outcome == 'success'
+      - name: Analyze code
+        run: dart analyze --fatal-infos
+        if: always() && steps.install.outcome == 'success'
+
+  # Run tests on a matrix consisting of two dimensions:
+  # 1. OS: ubuntu-latest, (macos-latest, windows-latest)
+  # 2. release channel: dev
+  test:
+    needs: analyze
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        # Add macos-latest and/or windows-latest if relevant for this package.
+        os: [ubuntu-latest]
+        sdk: [3.2, dev]
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: dart-lang/setup-dart@e630b99d28a3b71860378cafdc2a067c71107f94
+        with:
+          sdk: ${{ matrix.sdk }}
+      - id: install
+        name: Install dependencies
+        run: dart pub get
+      - name: Run VM tests
+        run: dart test --platform vm
+        if: always() && steps.install.outcome == 'success'
+
+  coverage:
+    needs: test
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+    - uses: dart-lang/setup-dart@e630b99d28a3b71860378cafdc2a067c71107f94
+      with:
+        sdk: dev
+    - name: Install dependencies
+      run: dart pub get
+    - name: Install coverage
+      run: dart pub global activate coverage
+    - name: Collect and report coverage
+      run: dart pub global run coverage:test_with_coverage
+    - name: Upload coverage
+      uses: coverallsapp/github-action@master
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}
+        path-to-lcov: pkgs/markdown/coverage/lcov.info

.github/workflows/markdown_crash_test.yaml

@@ -0,0 +1,27 @@
+# Run against all markdown files in latest version of packages on pub.dev to
+# see if any can provoke a crash
+
+name: package:markdown: crash tests
+
+on:
+  schedule:
+    # “At 00:00 (UTC) on Sunday.”
+    - cron: '0 0 * * 0'
+
+defaults:
+  run:
+    working-directory: pkgs/markdown/
+
+jobs:
+  crash-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+
+      - uses: dart-lang/setup-dart@e630b99d28a3b71860378cafdc2a067c71107f94
+
+      - name: Install dependencies
+        run: dart pub get
+
+      - name: Run crash_test.dart
+        run: dart test -P crash_test test/crash_test.dart

.github/workflows/markdown_flutter.yaml

@@ -0,0 +1,66 @@
+# Run a smoke test against package:flutter_markdown.
+
+name: package:markdown: flutter
+
+on:
+  # Run on PRs and pushes to the default branch.
+  push:
+    branches: [ main ]
+    paths:
+      - '.github/workflows/markdown_flutter.yaml'
+      - 'pkgs/markdown/**'
+  pull_request:
+    branches: [ main ]
+    paths:
+      - '.github/workflows/markdown_flutter.yaml'
+      - 'pkgs/markdown/**'
+  schedule:
+    - cron: "0 0 * * 0"
+
+env:
+  PUB_ENVIRONMENT: bot.github
+
+jobs:
+  smoke-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: clone dart-lang/tools
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+        with:
+          repository: dart-lang/tools
+          path: tools_repo
+
+      - name: clone flutter/packages
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+        with:
+          repository: flutter/packages
+          path: flutter_packages
+
+      # Install the Flutter SDK using the subosito/flutter-action GitHub action.
+      - name: install the flutter sdk
+        uses: subosito/flutter-action@74af56c5ed2697ba4621264652728e8d217e53d3
+        with:
+          channel: beta
+
+      - name: flutter --version
+        run: flutter --version
+
+      - name: create pubspec_overrides.yaml
+        working-directory: flutter_packages/packages/flutter_markdown
+        run: |
+          echo "dependency_overrides:"        > pubspec_overrides.yaml
+          echo "  markdown:"                 >> pubspec_overrides.yaml
+          echo "    path: ../../../tools_repo/pkgs/markdown" >> pubspec_overrides.yaml
+
+      - name: flutter pub get
+        working-directory: flutter_packages/packages/flutter_markdown
+        run: flutter pub get
+
+      - name: flutter analyze package:flutter_markdown
+        working-directory: flutter_packages/packages/flutter_markdown
+        run: flutter analyze
+
+      - name: flutter test package:flutter_markdown
+        working-directory: flutter_packages/packages/flutter_markdown
+        run: flutter test

README.md

@@ -31,6 +31,7 @@ don't naturally belong to other topic monorepos (like
 | [html](pkgs/html/) | APIs for parsing and manipulating HTML content outside the browser. | [![package issues](https://img.shields.io/badge/package:html-4774bc)](https://github.com/dart-lang/tools/issues?q=is%3Aissue+is%3Aopen+label%3Apackage%3Ahtml) | [![pub package](https://img.shields.io/pub/v/html.svg)](https://pub.dev/packages/html) |
 | [io](pkgs/io/) | Utilities for the Dart VM Runtime including support for ANSI colors, file copying, and standard exit code values. | [![pub package](https://img.shields.io/pub/v/io.svg)](https://pub.dev/packages/io) |
 | [json_rpc_2](pkgs/json_rpc_2/) | Utilities to write a client or server using the JSON-RPC 2.0 spec. | [![package issues](https://img.shields.io/badge/package:json_rpc_2-4774bc)](https://github.com/dart-lang/tools/issues?q=is%3Aissue+is%3Aopen+label%3Apackage%3Ajson_rpc_2) | [![pub package](https://img.shields.io/pub/v/json_rpc_2.svg)](https://pub.dev/packages/json_rpc_2) |
+| [markdown](pkgs/markdown/) | A portable Markdown library written in Dart that can parse Markdown into HTML. | [![pub package](https://img.shields.io/pub/v/markdown.svg)](https://pub.dev/packages/markdown) |
 | [mime](pkgs/mime/) | Utilities for handling media (MIME) types, including determining a type from a file extension and file contents. | [![package issues](https://img.shields.io/badge/package:mime-4774bc)](https://github.com/dart-lang/tools/issues?q=is%3Aissue+is%3Aopen+label%3Apackage%3Amime) | [![pub package](https://img.shields.io/pub/v/mime.svg)](https://pub.dev/packages/mime) |
 | [oauth2](pkgs/oauth2/) | A client library for authenticating with a remote service via OAuth2 on behalf of a user, and making authorized HTTP requests with the user's OAuth2 credentials. | [![package issues](https://img.shields.io/badge/package:oauth2-4774bc)](https://github.com/dart-lang/tools/issues?q=is%3Aissue+is%3Aopen+label%3Apackage%3Aoauth2) | [![pub package](https://img.shields.io/pub/v/oauth2.svg)](https://pub.dev/packages/oauth2) |
 | [package_config](pkgs/package_config/) | Support for reading and writing Dart Package Configuration files. | [![package issues](https://img.shields.io/badge/package:package_config-4774bc)](https://github.com/dart-lang/tools/issues?q=is%3Aissue+is%3Aopen+label%3Apackage%3Apackage_config) | [![pub package](https://img.shields.io/pub/v/package_config.svg)](https://pub.dev/packages/package_config) |

pkgs/markdown/.gitignore

@@ -0,0 +1,5 @@
+.dart_tool
+.packages
+.pub
+pubspec.lock
+doc/

pkgs/markdown/AUTHORS

@@ -0,0 +1,13 @@
+# Below is a list of people and organizations that have contributed
+# to the Dart project. Names should be added to the list like so:
+#
+#   Name/Organization <email address>
+
+Google Inc.
+
+David Peek <[email protected]>
+Daniel Schubert <[email protected]>
+Jirka Daněk <[email protected]>
+Seth Westphal <[email protected]>
+Tim Maffett <[email protected]>
+Alex Li <[email protected]>