Implemented edit/delete of comments.

Author: grokys

src/GitHub.App/Services/IssueishService.cs

@@ -88,5 +88,26 @@ public async Task<CommentModel> PostComment(HostAddress address, string issueish
             var graphql = await graphqlFactory.CreateConnection(address).ConfigureAwait(false);
             return await graphql.Run(postComment, vars).ConfigureAwait(false);
         }
+
+        public async Task DeleteComment(
+            HostAddress address,
+            string owner,
+            string repository,
+            int commentId)
+        {
+            var client = await apiClientFactory.CreateGitHubClient(address).ConfigureAwait(false);
+            await client.Issue.Comment.Delete(owner, repository, commentId).ConfigureAwait(false);
+        }
+
+        public async Task EditComment(
+            HostAddress address,
+            string owner,
+            string repository,
+            int commentId,
+            string body)
+        {
+            var client = await apiClientFactory.CreateGitHubClient(address).ConfigureAwait(false);
+            await client.Issue.Comment.Update(owner, repository, commentId, body).ConfigureAwait(false);
+        }
     }
 }

src/GitHub.App/ViewModels/Documents/PullRequestPageViewModel.cs

@@ -143,14 +143,24 @@ public async Task PostComment(ICommentViewModel comment)
             await AddPlaceholder().ConfigureAwait(true);
         }
 
-        Task ICommentThreadViewModel.DeleteComment(ICommentViewModel comment)
+        public async Task DeleteComment(ICommentViewModel comment)
         {
-            throw new NotImplementedException();
+            await service.DeleteComment(
+                HostAddress.Create(Repository.CloneUrl),
+                Repository.Owner,
+                Repository.Name,
+                comment.DatabaseId).ConfigureAwait(true);
+            timeline.Remove(comment);
         }
 
-        Task ICommentThreadViewModel.EditComment(ICommentViewModel comment)
+        public async Task EditComment(ICommentViewModel comment)
         {
-            throw new NotImplementedException();
+            await service.EditComment(
+                HostAddress.Create(Repository.CloneUrl),
+                Repository.Owner,
+                Repository.Name,
+                comment.DatabaseId,
+                comment.Body).ConfigureAwait(false);
         }
 
         async Task AddComment(CommentModel comment)

src/GitHub.Exports.Reactive/Services/IIssueishService.cs

@@ -39,5 +39,33 @@ Task<CommentModel> PostComment(
             HostAddress address,
             string issueishId,
             string body);
+
+        /// <summary>
+        /// Deletes an issue or pull request comment.
+        /// </summary>
+        /// <param name="address">The address of the server.</param>
+        /// <param name="owner">The repository owner.</param>
+        /// <param name="repository">The repository name.</param>
+        /// <param name="commentId">The database ID of the comment.</param>
+        Task DeleteComment(
+            HostAddress address,
+            string owner,
+            string repository,
+            int commentId);
+
+        /// <summary>
+        /// Edits an issue or pull request comment.
+        /// </summary>
+        /// <param name="address">The address of the server.</param>
+        /// <param name="owner">The repository owner.</param>
+        /// <param name="repository">The repository name.</param>
+        /// <param name="commentId">The database ID of the comment.</param>
+        /// <param name="body">The new comment body.</param>
+        Task EditComment(
+            HostAddress address,
+            string owner,
+            string repository,
+            int commentId,
+            string body);
     }
 }