feat: add interfaces and stubs for gitlab

Relates to #166

src/provider/gitlab/client.ts

@@ -0,0 +1,10 @@
+import { Client, Response } from '../client';
+import { GitlabRepository } from './repository';
+
+export class GitlabClient implements Client {
+
+  public async getRepository(_rid: string): Promise<Response<GitlabRepository>> {
+    throw new Error('Method not implemented.');
+  }
+
+}

src/provider/gitlab/merge-request.ts

@@ -0,0 +1,47 @@
+import { Response } from '../client';
+import {
+  PullRequest,
+  MergeBody,
+  MergeResult,
+  RequestReviewBody,
+  CancelReviewBody,
+  Comment
+} from '../pull-request';
+import { GitlabUser } from './user';
+
+export class GitlabMergeRequest implements PullRequest {
+
+  public id: number;
+  public number: number;
+  public state: 'open' | 'closed';
+  public title: string;
+  public body: string;
+  public url: string;
+  public sourceBranch: string;
+  public targetBranch: string;
+  public mergeable?: boolean | null | undefined;
+
+  public async getComments(): Promise<Response<Comment[]>> {
+    throw new Error('Method not implemented.');
+  }
+
+  public async merge(_body: MergeBody): Promise<Response<MergeResult>> {
+    throw new Error('Method not implemented.');
+  }
+
+  public async assign(_assignees: GitlabUser[]): Promise<void> {
+    throw new Error('Method not implemented.');
+  }
+
+  public async unassign(): Promise<void> {
+    throw new Error('Method not implemented.');
+  }
+
+  public async requestReview(_body: RequestReviewBody): Promise<void> {
+    throw new Error('Method not implemented.');
+  }
+
+  public async cancelReview(_body: CancelReviewBody): Promise<void> {
+    throw new Error('Method not implemented.');
+  }
+}

src/provider/gitlab/repository.ts

@@ -0,0 +1,36 @@
+import { Response } from '../client';
+import { Issue } from '../issue';
+import {
+  Repository,
+  ListPullRequestsParameters,
+  CreatePullRequestBody,
+  IssuesParameters
+} from '../repository';
+import { GitlabMergeRequest } from './merge-request';
+
+export class GitlabRepository implements Repository {
+
+  public name: string;
+  public defaultBranch: string;
+  public allowMergeCommits: boolean;
+  public allowSquashCommits: boolean;
+  public allowRebaseCommits: boolean;
+  public parent: Repository | undefined;
+
+  public async getPullRequests(_parameters?: ListPullRequestsParameters | undefined):
+      Promise<Response<GitlabMergeRequest[]>> {
+    throw new Error('Method not implemented.');
+  }
+
+  public async getPullRequest(_id: number): Promise<Response<GitlabMergeRequest>> {
+    throw new Error('Method not implemented.');
+  }
+
+  public async createPullRequest(_body: CreatePullRequestBody): Promise<Response<GitlabMergeRequest>> {
+    throw new Error('Method not implemented.');
+  }
+
+  public async getIssues(_parameters?: IssuesParameters | undefined): Promise<Response<Issue[]>> {
+    throw new Error('Method not implemented.');
+  }
+}

src/provider/gitlab/user.ts

@@ -0,0 +1,5 @@
+import { User } from '../user';
+
+export class GitlabUser implements User<number> {
+  public id: number;
+}