XpandPosh

1.3.0

Cmdlets/src/XpandPosh.Cmdlets/GitHub/CheckpointGithubIssue/Checkpoint-GithubIssue.cs

                                using System;

using System.Linq;

using System.Management.Automation;

using System.Reactive.Linq;

using System.Reactive.Threading.Tasks;

using System.Threading;

using System.Threading.Tasks;

using Octokit;

using SmartFormat;

using XpandPosh.Cmdlets.GitHub.GetGitHubCommitIssue;

using XpandPosh.CmdLets;

namespace XpandPosh.Cmdlets.GitHub.CheckpointGithubIssue{

    [CmdletBinding(SupportsShouldProcess = true)]

    [Cmdlet(VerbsData.Checkpoint, "GitHubIssue",SupportsShouldProcess = true)]

    public class CheckpointGitHubIssue : GitHubCmdlet{

        [Parameter(Mandatory = true)]

        public string Message{ get; set; } 

        [Parameter(Mandatory = true)]

        public ICommitIssues[] CommitIssues{ get; set; }

        protected override Task ProcessRecordAsync(){

            return LinkCommits()

                .HandleErrors(this)

                .WriteObject(this)

                .ToTask();

        }

        private IObservable<PSObject> LinkCommits( ){

            var synchronizationContext = SynchronizationContext.Current;

            var issueToNotify = CommitIssues

                    .Select(_ => _.Issues.Select(issue => (_.GitHubCommit, issue)).ToObservable()

                        .WriteVerboseObject(this,__ => $"Commit ({__.GitHubCommit.Sha}){__.GitHubCommit.Commit.Message} links to {__.issue.Number}",synchronizationContext)

                        .SelectMany(tuple => IssueComments(GitHubClient, _, tuple, synchronizationContext)))

                    .Merge();

            return issueToNotify

                .GroupBy(_ => (_.issue, _.repo1,_.repo2))

                .SelectMany(_ => _.TakeUntil(_.LastAsync()).ToArray()

                    .Select(tuples => tuples.Select(valueTuple => valueTuple.GitHubCommit).ToArray())

                    .Select(hubCommits => (key: _.Key, commits: hubCommits)))

                .ObserveOn(synchronizationContext)

                .SelectMany(_ => {

                    var comment = GenerateComment(_);

                    var issue = _.key.issue;

                    var psObject = Observable.Return(new PSObject(new {

                        IssueNumber = issue.Number, Milestone = issue.Milestone?.Title,issue.Title,

                        Commits = string.Join(",", _.commits.Select(commit => commit.Commit.Message)), Comment = comment

                    }));

                    var text = $"Create comment for issue {_.key.issue.Number}";

                    WriteVerbose(text);

                    if (ShouldProcess(text)){

                        return GitHubClient.Issue.Comment.Create(_.key.repo1, _.key.issue.Number, comment)

                            .ToObservable().Select(issueComment => psObject).Concat();

                    }

                    return psObject;

                })

                .DefaultIfEmpty();

        }

        private IObservable<(long repo1, long repo2, GitHubCommit GitHubCommit, Issue issue)> IssueComments(GitHubClient appClient, ICommitIssues _,

            (GitHubCommit GitHubCommit, Issue issue) tuple, SynchronizationContext synchronizationContext){

            return appClient.Issue.Comment

                .GetAllForIssue(_.Repository1.Id, tuple.issue.Number)

                .ToObservable()

                .ObserveOn(synchronizationContext)

                .Where(list => {

                    WriteVerbose($"Searching {list.Count} comments in Issue {tuple.issue.Number} for {tuple.GitHubCommit.Sha}");

                    var checkpoint = list.Any(comment => comment.Body.Contains(tuple.GitHubCommit.Sha));

                    WriteVerbose($"Checkpoint {(!checkpoint ? " not " : null)}exists");

                    return !checkpoint;

                })

                .Select(list => (repo1: _.Repository1.Id, repo2: _.Repository2.Id, _.GitHubCommit, tuple.issue));

        }

        private  string GenerateComment(((Issue issue, long repo1, long repo2) key, GitHubCommit[] commits) _){

            var objects = new object[] {

                new{

                    Options = this,

                    Commits = string.Join(",",

                        _.commits.Select(commit =>

                            $@"[{commit.Commit.Message}](https://github.com/{Organization}/{_.key.repo2}/commit/{commit.Sha})"))

                }

            };

            var comment = Smart.Format(Message, objects);

            return comment;

        }

    }

}