Implement missing endpoints and small fixes

lib/src/common/model/repos.dart

@@ -380,6 +380,39 @@ class CreateRepository {
   Map<String, dynamic> toJson() => _$CreateRepositoryToJson(this);
 }
 
+/// Model class for a new repository to be created using a template.
+@JsonSerializable()
+class CreateRepositoryFromTemplate {
+  CreateRepositoryFromTemplate(
+    this.name, {
+    this.owner,
+    this.description,
+    this.includeAllBranches,
+    this.private,
+  });
+
+  /// Repository Name
+  final String name;
+
+  /// Owner Name
+  final String? owner;
+
+  /// Repository Description
+  String? description;
+
+  /// Include the directory structure and files from all branches in the
+  /// template repository, and not just the default branch. Default: false.
+  @JsonKey(name: 'include_all_branches')
+  bool? includeAllBranches = false;
+
+  /// If the repository should be private or not.
+  bool? private = false;
+
+  factory CreateRepositoryFromTemplate.fromJson(Map<String, dynamic> input) =>
+      _$CreateRepositoryFromTemplateFromJson(input);
+  Map<String, dynamic> toJson() => _$CreateRepositoryFromTemplateToJson(this);
+}
+
 /// Model class for a branch.
 @JsonSerializable()
 class Branch {

lib/src/common/model/repos_forks.dart

@@ -2,11 +2,13 @@ import 'package:json_annotation/json_annotation.dart';
 part 'repos_forks.g.dart';
 
 /// Model class for a new fork to be created.
+/// https://docs.github.com/en/rest/repos/forks#create-a-fork
 @JsonSerializable()
 class CreateFork {
-  CreateFork([this.organization]);
+  CreateFork({this.organization, this.name});
 
   String? organization;
+  String? name;
 
   factory CreateFork.fromJson(Map<String, dynamic> input) =>
       _$CreateForkFromJson(input);

lib/src/common/repos_service.dart

@@ -118,6 +118,21 @@ class RepositoriesService extends Service {
     }
   }
 
+  /// Creates a repository with [repository] using a template. If an [org] is
+  /// specified, the new repository will be created under that organization. If
+  /// no [org] is specified, it will be created for the authenticated user.
+  ///
+  /// API docs: https://developer.github.com/v3/repos/#create
+  Future<Repository> createRepositoryFromTemplate(
+      RepositorySlug template, CreateRepositoryFromTemplate repository) async {
+    ArgumentError.checkNotNull(repository);
+    return github.postJSON<Map<String, dynamic>, Repository>(
+      '/repos/${template.fullName}/generate',
+      body: GitHubJson.encode(repository),
+      convert: (i) => Repository.fromJson(i),
+    );
+  }
+
   Future<LicenseDetails> getLicense(RepositorySlug slug) async {
     ArgumentError.checkNotNull(slug);
     return github.getJSON<Map<String, dynamic>, LicenseDetails>(
@@ -153,29 +168,34 @@ class RepositoriesService extends Service {
 
   /// Edit a Repository.
   ///
-  /// API docs: https://developer.github.com/v3/repos/#edit
-  Future<Repository> editRepository(RepositorySlug slug,
-      {String? name,
-      String? description,
-      String? homepage,
-      bool? private,
-      bool? hasIssues,
-      bool? hasWiki,
-      bool? hasDownloads}) async {
+  /// API docs: https://docs.github.com/en/rest/repos/repos#update-a-repository
+  Future<Repository> editRepository(
+    RepositorySlug slug, {
+    String? name,
+    String? description,
+    String? homepage,
+    bool? private,
+    bool? hasIssues,
+    bool? hasWiki,
+    bool? hasDownloads,
+    String? defaultBranch,
+  }) async {
     ArgumentError.checkNotNull(slug);
+
     final data = createNonNullMap({
-      'name': name!,
-      'description': description!,
-      'homepage': homepage!,
-      'private': private!,
-      'has_issues': hasIssues!,
-      'has_wiki': hasWiki!,
-      'has_downloads': hasDownloads!,
-      'default_branch': 'defaultBranch'
+      'name': name,
+      'description': description,
+      'homepage': homepage,
+      'private': private,
+      'has_issues': hasIssues,
+      'has_wiki': hasWiki,
+      'has_downloads': hasDownloads,
+      'default_branch': defaultBranch,
     });
-    return github.postJSON(
+    return github.postJSON<Map<String, dynamic>, Repository>(
       '/repos/${slug.fullName}',
       body: GitHubJson.encode(data),
+      convert: (i) => Repository.fromJson(i),
       statusCode: 200,
     );
   }
@@ -309,16 +329,16 @@ class RepositoriesService extends Service {
     return false;
   }
 
+  /// https://docs.github.com/en/rest/collaborators/collaborators#add-a-repository-collaborator
   Future<bool> addCollaborator(RepositorySlug slug, String user) async {
     ArgumentError.checkNotNull(slug);
     ArgumentError.checkNotNull(user);
     return github
         .request(
           'PUT',
           '/repos/${slug.fullName}/collaborators/$user',
-          statusCode: StatusCodes.NO_CONTENT,
         )
-        .then((response) => response.statusCode == StatusCodes.NO_CONTENT);
+        .then((response) => response.statusCode == StatusCodes.CREATED || response.statusCode == StatusCodes. NO_CONTENT);
   }
 
   Future<bool> removeCollaborator(RepositorySlug slug, String user) async {