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+# <a id="contributing"></a> Contributing
+
+Icinga Web 2 Module for Maps is an open source project and lives from your ideas and contributions.
+
+There are many ways to contribute, from improving the documentation, submitting
+bug reports and features requests or writing code to add enhancements or fix bugs.
+
+#### Table of Contents
+
+1. [Introduction](#contributing-intro)
+2. [Fork the Project](#contributing-fork)
+3. [Branches](#contributing-branches)
+4. [Commits](#contributing-commits)
+5. [Pull Requests](#contributing-pull-requests)
+6. [Testing](#contributing-testing)
+7. [Source Code Patches](#contributing-patches-source-code)
+8. [Documentation Patches](#contributing-patches-documentation)
+9. [Review](#contributing-review)
+
+## <a id="contributing-intro"></a> Introduction
+
+Please consider our [roadmap](https://github.com/nbuchwitz/icingaweb2-module-map/milestones) and
+[open issues](https://github.com/nbuchwitz/icingaweb2-module-map/issues) when you start contributing
+to the project.
+
+Before starting your work on this Map module for Icinga Web 2, you should [fork the project](https://help.github.com/articles/fork-a-repo/)
+to your GitHub account. This allows you to freely experiment with your changes.
+When your changes are complete, submit a [pull request](https://help.github.com/articles/using-pull-requests/).
+All pull requests will be reviewed and merged if they suit some general guidelines:
+
+* Changes are located in a topic branch
+* For new functionality, proper tests are written
+* Changes should follow the existing coding style and standards
+
+Please continue reading in the following sections for a step by step guide.
+
+## <a id="contributing-fork"></a> Fork the Project
+
+[Fork the project](https://help.github.com/articles/fork-a-repo/) to your GitHub account
+and clone the repository:
+
+```
+git clone git@github.com:dnsmichi/icingaweb2-module-map.git
+cd icingaweb2-module-map
+```
+
+Add a new remote `upstream` with this repository as value.
+
+```
+git remote add upstream https://github.com/nbuchwitz/icingaweb2-module-map.git
+```
+
+You can pull updates to your fork's master branch:
+
+```
+git fetch --all
+git pull upstream HEAD
+```
+
+Please continue to learn about [branches](CONTRIBUTING.md#contributing-branches).
+
+## <a id="contributing-branches"></a> Branches
+
+Choosing a proper name for a branch helps us identify its purpose and possibly
+find an associated bug or feature.
+Generally a branch name should include a topic such as `fix` or `feature` followed
+by a description and an issue number if applicable. Branches should have only changes
+relevant to a specific issue.
+
+```
+git checkout -b fix/service-template-typo-1234
+git checkout -b feature/config-handling-1235
+```
+
+Continue to apply your changes and test them. More details on specific changes:
+
+* [Source Code Patches](#contributing-patches-source-code)
+* [Documentation Patches](#contributing-patches-documentation)
+
+## <a id="contributing-commits"></a> Commits
+
+Once you've finished your work in a branch, please ensure to commit
+your changes. A good commit message includes a short topic, additional body
+and a reference to the issue you wish to solve (if existing).
+
+Fixes:
+
+```
+Fix missing style in detail view
+
+refs #4567
+```
+
+Features:
+
+```
+Add DateTime picker
+
+refs #1234
+```
+
+You can add multiple commits during your journey to finish your patch.
+Don't worry, you can squash those changes into a single commit later on.
+
+## <a id="contributing-pull-requests"></a> Pull Requests
+
+Once you've committed your changes, please update your local master
+branch and rebase your fix/feature branch against it before submitting a PR.
+
+```
+git checkout master
+git pull upstream HEAD
+
+git checkout fix/style-detail-view
+git rebase master
+```
+
+Once you've resolved any conflicts, push the branch to your remote repository.
+It might be necessary to force push after rebasing - use with care!
+
+New branch:
+```
+git push --set-upstream origin fix/style-detail-view
+```
+
+Existing branch:
+```
+git push -f origin fix/style-detail-view
+```
+
+You can now either use the [hub](https://hub.github.com) CLI tool to create a PR, or nagivate
+to your GitHub repository and create a PR there.
+
+The pull request should again contain a telling subject and a reference
+with `fixes` to an existing issue id if any. That allows developers
+to automatically resolve the issues once your PR gets merged.
+
+```
+hub pull-request
+
+<a telling subject>
+
+fixes #1234
+```
+
+Thanks a lot for your contribution!
+
+
+### <a id="contributing-rebase"></a> Rebase a Branch
+
+If you accidentally sent in a PR which was not rebased against the upstream master,
+developers might ask you to rebase your PR.
+
+First off, fetch and pull `upstream` master.
+
+```
+git checkout master
+git fetch --all
+git pull upstream HEAD
+```
+
+Then change to your working branch and start rebasing it against master:
+
+```
+git checkout fix/style-detail-view
+git rebase master
+```
+
+If you are running into a conflict, rebase will stop and ask you to fix the problems.
+
+```
+git status
+
+ both modified: path/to/conflict.php
+```
+
+Edit the file and search for `>>>`. Fix, build, test and save as needed.
+
+Add the modified file(s) and continue rebasing.
+
+```
+git add path/to/conflict.php
+git rebase --continue
+```
+
+Once succeeded ensure to push your changed history remotely.
+
+```
+git push -f origin fix/style-detail-view
+```
+
+
+If you fear to break things, do the rebase in a backup branch first and later replace your current branch.
+
+```
+git checkout fix/style-detail-view
+git checkout -b fix/style-detail-view-rebase
+
+git rebase master
+
+git branch -D fix/style-detail-view
+git checkout -b fix/style-detail-view
+
+git push -f origin fix/style-detail-view
+```
+
+### <a id="contributing-squash"></a> Squash Commits
+
+> **Note:**
+>
+> Be careful with squashing. This might lead to non-recoverable mistakes.
+>
+> This is for advanced Git users.
+
+Say you want to squash the last 3 commits in your branch into a single one.
+
+Start an interactive (`-i`) rebase from current HEAD minus three commits (`HEAD~3`).
+
+```
+git rebase -i HEAD~3
+```
+
+Git opens your preferred editor. `pick` the commit in the first line, change `pick` to `squash` on the other lines.
+
+```
+pick e4bf04e47 Fix style detail view
+squash d7b939d99 Tests
+squash b37fd5377 Doc updates
+```
+
+Save and let rebase to its job. Then force push the changes to the remote origin.
+
+```
+git push -f origin fix/style-detail-view
+```
+
+
+## <a id="contributing-testing"></a> Testing
+
+You can help test-drive the Git master inside the
+[Icinga 2 Vagrant boxes](https://github.com/icinga/icinga-vagrant).
+
+ $ git clone https://github.com/Icinga/icinga-vagrant.git
+ $ cd icinga-vagrant/icinga2x
+ $ vagrant up
+ $ vagrant ssh -c "cd /usr/share/icingaweb2/modules/map && sudo git pull"
+
+## <a id="contributing-patches-source-code"></a> Source Code Patches
+
+Icinga Web 2 is written in PHP and JavaScript. This module relies on the base
+framework.
+
+Start your work in a test installation where the module's directory is mounted
+and you can see codes change in a direct manner.
+
+
+## <a id="contributing-review"></a> Review
+
+### <a id="contributing-pr-review"></a> Pull Request Review
+
+This is only important for developers who will review pull requests. If you want to join
+the development team, kindly contact us.
+
+- Ensure that the style guide applies.
+- Verify that the patch fixes a problem or linked issue, if any.
+- Discuss new features with team members.
+- Test the patch in your local dev environment.
+
+If there are changes required, kindly ask for an updated patch.
+
+Once the review is completed, merge the PR via GitHub.
+
+#### <a id="contributing-pr-review-fixes"></a> Pull Request Review Fixes
+
+In order to amend the commit message, fix conflicts or add missing changes, you can
+add your changes to the PR.
+
+A PR is just a pointer to a different Git repository and branch.
+By default, pull requests allow to push into the repository of the PR creator.
+
+Example for [#4956](https://github.com/Icinga/icinga2/pull/4956):
+
+At the bottom it says "Add more commits by pushing to the fix/persistent-comments-are-not-persistent branch on TheFlyingCorpse/icinga2."
+
+First off, add the remote repository as additional origin and fetch its content:
+
+```
+git remote add theflyingcorpse https://github.com/TheFlyingCorpse/icinga2
+git fetch --all
+```
+
+Checkout the mentioned remote branch into a local branch (Note: `theflyingcorpse` is the name of the remote):
+
+```
+git checkout theflyingcorpse/fix/persistent-comments-are-not-persistent -b fix/persistent-comments-are-not-persistent
+```
+
+Rebase, amend, squash or add your own commits on top.
+
+Once you are satisfied, push the changes to the remote `theflyingcorpse` and its branch `fix/persistent-comments-are-not-persistent`.
+The syntax here is `git push <remote> <localbranch>:<remotebranch>`.
+
+```
+git push theflyingcorpse fix/persistent-comments-are-not-persistent:fix/persistent-comments-are-not-persistent
+```
+
+In case you've changed the commit history (rebase, amend, squash), you'll need to force push. Be careful, this can't be reverted!
+
+```
+git push -f theflyingcorpse fix/persistent-comments-are-not-persistent:fix/persistent-comments-are-not-persistent
+```