cEP-0024.md: GitMate Plugins

Closes #141

cEP-0024.md

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+# Implement GitMate automations and plugins for coala
+
+| Metadata |                                                       |
+| -------- | ----------------------------------------------------- |
+| cEP      | 24                                                    |
+| Version  | 1.0                                                   |
+| Title    | Implement Gitmate automations and plugins for coala   |
+| Authors  | Vamshi Krishna Bommerla <mailto:[email protected]> |
+| Status   | Proposed                                              |
+| Type     | Process                                               |
+
+## Abstract
+
+This cEP describes the details of the process of creating new automations and
+plugins in GitMate which helps coala development workflow, as a part of the
+[GSoC project](https://summerofcode.withgoogle.com/projects/#5344316227059712).
+
+## Introduction
+
+[GitMate](https://gitmate.io/) is an automation tool for developers. While it
+works well, there area number of plugins which saves a lot of time of our
+community(for example automatically close PRs from master). Many of them are
+general plugins, which are required by every org, but we need more plugins
+which support coala development workflow.
+
+## New Features
+
+### Auto-assign issue based on commit mention
+
+When a commit mentions(fixes, closes) a unassigned issues, auto assign
+commit author to the mentioned unassigned issues.
+
+### Auto-reject PR opened on master of forks
+
+Normally, we should make changes in different branch from master of forks, and
+submit a PR. But, sometimes we receive PRs from master of forks. To solve this
+problem, we need a mechanism by which gitmate automatically rejects those PR’s,
+and inform the PR author to work on a different branch.
+
+### Auto-mark PR with necessary labels as per the reviews done
+
+When a reviewer reviews a PR, he either approves changes or request changes or
+comments something and leaves it there, but PR would be still in the review
+queue, so there should be an automation to mark approve label if reviewer
+approves changes and mark WIP if reviewer requests changes or comments on the
+source code when there is CI failure.
+
+### Fixes vs Closes automated checking
+
+Our members often confuse when we should use `Fixes` or `Closes` on a commit.
+So, GitMate should automatically check every commit for issues which is being
+Fixed or Closed, if those issues have bug label(label will be configurable),
+`Fixes` should be used, and vice versa. If there is an error, gitmate commit
+review should fail and inform the PR author how to fix it.
+
+### Add support to ban/blacklist a user
+
+Sometimes, there will be members in the organisation, misusing the rights,
+violating the code of conduct, disturbing our workflow. It will definitely take
+some time to fix that security issue, bearing that user until then, there will
+be a lot of pain. So, a plugin to ban a user from using GitMate further and
+removing his rights at that very moment will be helpful. Ban user plugin,
+which can be configured in gitmate UI will be created within this project.
+Removing that user from the org will be configurable.
+
+### Assign Plugin
+
+Assign issue when a user comments on an issue requesting for an `assignment`
+to that issue. Will support settings for each team like limit team to work on
+issues with specific set of labels, limit number of issues of specified label,
+a team member can work on. corobo does all these things, but it is based just
+on gitter messages and corobo is used in coala only, but gitmate is based on
+github, used by many other users and is more configurable.
+
+```
+Settings:
+
+Team - newcomer
+Label - newcomer  Limit - 1
+Label - low       Limit - 2
+
+Team 2....
+```
+
+```
+> @gitmate-bot assign
+
+  @user, you have been assigned
+```
+
+### Auto-review merge conflicts
+
+Check for merge conflicts in a PR, if there are any conflicts, mark PR with
+a certain label(configurable) and post a message(configurable) as a comment
+on the PR.