Broke up contributing docs into 4 sections and unified code contribtion guide.

The guidelines for contributing code were scattered across a section of contributing.md and collaboration-on-git.md.  I've updated this to have separate contributing/code.md page with all the content in a single cohesive page.  We also have contributing/documentation.md, contributing/issues.md and contributing/translation.md.
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See [installation on different platforms](http://doc.silverstripe.org/framework/en/installation/),
and [installation from source](http://doc.silverstripe.org/framework/en/installation/from-source).
## Development and contribution ##
If you would like to make changes to SilverStripe core product, we have an extensive [guide to contributing code](http://doc.silverstripe.org/framework/en/misc/contributing/code) that we invite you to look at before submitting a pull request.
If you would like to get involved, but don't know what to fix, the [Trac tickets](http://open.silverstripe.org/report/125) are a good place to start.
For other ways to contribute, see the [code contribution guidelines](http://doc.silverstripe.org/framework/en/misc/contributing)
## Links ##
* [Requirements](http://doc.silverstripe.org/framework/en/installation/server-requirements)

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# Git Contributors Guide
If you're a developer who wants to work on the SilverStripe source code and submit your changes for consideration to be merged into the master branch, here's how.
In case you're after a general overview on how you can contribute to SilverStripe, see our "[Contributing](contributing)" guide.
## Quickfire Do's and Don't's
If you aren't familiar with git and GitHub, try reading the ["GitHub bootcamp documentation"](http://help.github.com/).
We also found the [free online git book](http://progit.org/book/) and the [git crash course](http://gitref.org/) useful.
If you're familiar with it, here's the short version of what you need to know. Once you fork and download the code:
* **Don't develop on the master branch.** Always create a development branch specific to "the issue" you're working on (mostly on [open.silverstripe.org](http://open.silverstripe.org)). Name it by issue number and description. For example, if you're working on Issue #100, a `DataObject::get_one()` bugfix, your development branch should be called 100-dataobject-get-one. If you decide to work on another issue mid-stream, create a new branch for that issue--don't work on both in one branch.
* **Do not merge** the upstream master with your development branch; *rebase* your branch on top of the upstream master.
* **A single development branch should represent changes related to a single issue.** If you decide to work on another issue, create another branch.
* **Squash your commits.** After you rebase your work on top of the upstream master, you can squash multiple commits into one. Say, for instance, you've got three commits in related to Issue #100. Squash all three into one with the message "Issue #100 Description of the issue here." We won't accept pull requests for multiple commits related to a single issue; it's up to you to squash and clean your commit tree. (Remember, if you squash commits you've already pushed to GitHub, you won't be able to push that same branch again. Create a new local branch, squash, and push the new squashed branch.)
## Workflow Diagram ##
![Workflow diagram](http://www.silverstripe.org/assets/doc-silverstripe-org/collaboration-on-github.png)
## Step-by-step: From forking to sending the pull request
1. Follow the ["Installing from source"](../installation/from-source) ("Option 2: Installation for contributions"),
which explains how to fork the core modules and add the correct "upstream" remote
1. Branch for new issue (<code>$ git branch ###-description; git checkout ###-description</code>) and develop on issue branch. _As time passes, the upstream repository accumulates new commits. Keep your working copy's master branch and issue branch up to date by periodically rebasing: fetch upstream, rebase master, rebase issue branch (<code>$ git fetch upstream; git checkout master; git rebase upstream/master; git checkout ###-description; git rebase master</code>)_
1. When development is complete, rebase one more time, then branch from dev branch to release candidate branch (<code>$ git checkout ###-description; git branch ###-description-rc; git checkout ###-description-rc</code>). Squash all _X_ commits that pertain to the issue into one clean, descriptive commit (<code>$ git rebase -i HEAD~X</code>)
1. Push release candidate branch to GitHub (<code>$ git push origin ###-description-rc</code>)
1. Issue pull request on GitHub (Click Pull Request button)
## Create an Issue-Specific Development Branch
Before you start working on a new feature or bugfix, create a new branch dedicated to that one change named by issue number and description. If you're working on Issue #100, a retweet bugfix, create a new branch with the issue number and description, like this:
$ git branch 100-dataobject-get-one
$ git checkout 100-dataobject-get-one
Edit and test the files on your development environment. When you've got something the way you want and established that it works, commit the changes to your branch on your local git repo.
$ git add <filename>
$ git commit -m 'Issue #100: Some kind of descriptive message'
You'll need to use git add for each file that you created or modified. There are ways to add multiple files, but I highly recommend a more deliberate approach unless you know what you're doing.
Then, you can push your new branch to GitHub, like this (replace `100-dataobject-get-one` with your branch name):
$ git push origin 100-dataobject-get-one
You should be able to log into your GitHub account, switch to the branch, and see that your changes have been committed. Then click the Pull button to request that your commits get merged into the development master.
*IMPORTANT*: Before you issue a pull request, make sure it gets accepted by running through the ["Contributing Check List"](contributing#check-list).
## Rebase Your Development Branch on the Latest Upstream
To keep your development branch up to date, rebase your changes on top of the current state of the upstream master. See the *What's git-rebase?* section below to learn more about rebasing.
If you've set up an upstream branch as detailed above, and a development branch called `100-dataobject-get-one`, you'd update `upstream`, update your local master, and rebase your branch from it like so:
$ git fetch upstream
$ git checkout master
$ git rebase upstream/master
$ git checkout 100-dataobject-get-one
# [make sure all is committed as necessary in branch]
$ git rebase master
You may need to resolve conflicts that occur when a file on the development trunk and one of your files have both been changed. Edit each file to resolve the differences, then commit the fixes to your development server repo and test. Each file will need to be "added" before running a "commit."
Conflicts are clearly marked in the code files. Make sure to take time in determining what version of the conflict you want to keep and what you want to discard.
$ git add <filename>
$ git commit
To push the updates to your GitHub repo, replace 100-dataobject-get-one with your branch name and run:
$ git push origin 100-dataobject-get-one
## Squash All Commits Related to a Single Issue into a Single Commit
Once you have rebased your work on top of the latest state of the upstream master, you may have several commits related to the issue you were working on. Once everything is done, squash them into a single commit with a descriptive message (see ["Contributing: Commit Messages"](contributing#commit-messages)).
To squash four commits into one, do the following:
$ git rebase -i HEAD~4
In the text editor that comes up, replace the words "pick" with "squash" next to the commits you want to squash into the commit before it. Save and close the editor, and git will combine the "squash"'ed commits with the one before it. Git will then give you the opportunity to change your commit message to something like, "BUGFIX Issue #100: Fixed DataObject::get_one() parameter order"
Important: If you've already pushed commits to GitHub, and then squash them locally, you will not be able to push that same branch to GitHub again. Create a new branch--like 100-dataobject-get-one-squashed or 100-dataobject-get-one-rc1 (for "release candidate 1") - and squash your commits there. Once everything is squashed and ready, push the new squashed branch to GitHub and send your pull request to Gina.
Helpful hint: You can always edit your last commit message by using:
$ git commit --amend
## Some gotchas
Be careful not to commit any of your configuration files, logs, or throwaway test files to your GitHub repo. These files can contain information you wouldn't want publicly viewable and they will make it impossible to merge your contributions into the main development trunk.
Most of these special files are listed in the <code>.gitignore</code> file and won't be included in any commit, but you should carefully review the files you have modified and added before staging them and committing them to your repo. The git status command will display detailed information about any new files, modifications and staged.
$ git status
One thing you do not want to do is to issue a git commit with the -a option. This automatically stages and commits every modified file that's not expressly defined in .gitignore, including your crawler logs.
$ git commit -a
## What's git-rebase?
Using <code>git-rebase</code> helps create clean commit trees and makes keeping your code up-to-date with the current state of the upstream master easy. Here's how it works.
Let's say you're working on Issue #212 a new plugin in your own branch and you start with something like this:
1---2---3 #212-my-new-plugin
/
A---B #master
You keep coding for a few days and then pull the latest upstream stuff and you end up like this:
1---2---3 #212-my-new-plugin
/
A---B--C--D--E--F #master
So all these new things (C,D,..F) have happened since you started. Normally you would just keep going (let's say you're not finished with the plugin yet) and then deal with a merge later on, which becomes a commit, which get moved upstream and ends up grafted on the tree forever.
A cleaner way to do this is to use rebase to essentially rewrite your commits as if you had started at point F instead of point B. So just do:
git rebase master 212-my-new-plugin
git will rewrite your commits like this:
1---2---3 #212-my-new-plugin
/
A---B--C--D--E--F #master
It's as if you had just started your branch. One immediate advantage you get is that you can test your branch now to see if C, D, E, or F had any impact on your code (you don't need to wait until you're finished with your plugin and merge to find this out). And, since you can keep doing this over and over again as you develop your plugin, at the end your merge will just be a fast-forward (in other words no merge at all).
So when you're ready to send the new plugin upstream, you do one last rebase, test, and then merge (which is really no merge at all) and send out your pull request. Then in most cases, we have a simple fast-forward on our end (or at worst a very small rebase or merge) and over time that adds up to a simpler tree.
More info on the ["Rebasing" chapter on progit.org](http://progit.org/book/ch3-6.html) and the [git rebase man page](http://www.kernel.org/pub/software/scm/git/docs/git-rebase.html).
## Related
* [Contributing: Submitting patches](/misc/contributing)
* [Installation: From Source](/installation/from-source)
## License
This guide has been adapted from the ["Thinkup" developer guide](https://github.com/ginatrapani/ThinkUp/wiki/Developer-Guide%3A-Get-the-Source-Code-from-GitHub-and-Keep-It-Updated),
with friendly permission from Gina Trapani/[thinkupapp.com](http://thinkupapp.com).

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# Contributing
Any open source product is only as good as the community behind it. You can participate by sharing
code, ideas, or simply helping others. No matter what your skill level is, every contribution counts.
See our [high level overview on silverstripe.org](http://silverstripe.org/contributing-to-silverstripe) on how you can help out.
## Sharing your Opinion
* [silverstripe.org/forums](http://silverstripe.org/forums): Forums on silverstripe.org
* [silverstripe-dev](http://groups.google.com/group/silverstripe-dev): Core development mailinglist
* [silverstripe-documentation](http://groups.google.com/group/silverstripe-documentation): Documentation team mailing list
## Reporting Bugs
If you have discovered a bug in SilverStripe, we'd be glad to hear about it -
well written bug reports can be half of the solution already!
Our bugtracker is located on [open.silverstripe.org](http://open.silverstripe.org/) (create a [new ticket](http://open.silverstripe.org/newticket)).
## Submiting Bugfixes and Enhancements
We're not perfect, and need your help - for example in the form of patches for our modules and core codebase.
### Setup your project for contributions
In contrast to running a SilverStripe website, you can't use the standard download archive for this purpose.
The ["Installing from source"](../installation/from-source) guide explains how to get started.
For other modules, our [module list on silverstripe.org](http://silverstripe.org/modules) lists the repository locations,
typically using a version control system like "git" or "[subversion](subversion)".
### Check List
* Adhere to our [coding conventions](coding-conventions)
* If your patch is extensive, discuss it first on the [silverstripe forum](http///www.silverstripe.org/forums/) (ideally before doing any serious coding)
* When working on existing tickets, assign them to you and provide status updates through ticket comments
* Check your patches against the latest "trunk" or "master", as well as the latest release.
Please not that the latest stable release will often not be sufficient! (of all modules)
* Provide complete [unit test coverage](/topics/testing) - depending on the complexity of your work, this is a required
step.
* Do not set milestones. If you think your patch should be looked at with priority, mark it as "critical".
* Describe specifics on how to test the effects of the patch
* It's better to submit multiple patches with separate bits of functionality than a big patch containing lots of
changes
* Document your code inline through [PHPDoc](http://en.wikipedia.org/wiki/PHPDoc) syntax. See our
[API documentation](http://api.silverstripe.org/trunk) for good examples.
* Also check and update documentation on [doc.silverstripe.org](http://doc.silverstripe.org). Check for any references to functionality deprecated or extended through your patch. Documentation changes should be included in the patch.
* We will attribute the change to you whereever possible (git does this automatically for pull requests)
* If you get stuck, please post to the [forum](http://silverstripe.org/forum) or for deeper core problems, to the [core mailinglist](https://groups.google.com/forum/#!forum/silverstripe-dev)
* When working with the CMS, please read the ["CMS Architecture Guide"](/reference/cms-architecture) first
The core team is responsible for reviewing patches and deciding if they will make it into core. If
there are any problems they will follow up with you, so please ensure they have a way to contact you!
### Sending git pull requests
The SilverStripe core modules (`framework` and `cms`), as well as some of the more popular modules are in
git version control. SilverStripe hosts its modules on [github.com/silverstripe](http://github.com/silverstripe) and [github.com/silverstripe-labs](http://github.com/silverstripe-labs).
After [installing git](http://help.github.com/git-installation-redirect) and creating a [free github.com account](https://github.com/signup/free), you can "fork" a module,
which creates a copy that you can commit to (see github's [guide to "forking"](http://help.github.com/forking/)).
Now you have two choices: Smaller fixes (e.g. typos) can be edited directly in the github.com web interface
(every file view has an "edit this file" link). More commonly, you will deal with a working copy on your own computer. After committing your fix, you can send the module authors a so called ["pull request"](http://help.github.com/pull-requests/).
The module authors will get notified automatically, review your patch, and merge it back as appropriate.
For new features, we recommend creating a ["feature branch"](http://progit.org/book/ch3-3.html) rather than a really big patch.
Note that we no longer accept patch file attachments ("diffs") as commonly created through subversion.
It is important that you use git branching properly in order to avoid messy and time-consuming merges
later on, so please read our in-depth ["Collaboration on Git"](collaboration-on-git) guide.
If you want to learn more about git, please have a look at the [free online git book](http://progit.org/book/) and the [git crash course](http://gitref.org/).
### Commit Messages
We try to maintain a consistent record of descriptive commit messages.
Most importantly: Keep the first line short, and add more detail below.
This ensures commits are easy to browse, and look nice on github.com
(more info about [proper git commit messages](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html)).
As we automatically generate [changelogs](http://doc.silverstripe.org/sapphire/en/trunk/changelogs/) from them, we need a way to categorize and filter.
Please prefix **noteworthy** commit messages with one of the following tags:
* `NEW`: New feature or major enhancement (both for users and developers)
* `API`: Addition of a new API, or modification/removal/deprecation of an existing API.
Includes any change developers should be aware of when upgrading.
* `BUG`: Bugfix or minor enhancement on something developers or users are likely to encounter.
All other commits should not be tagged if they are so trivial that most developers
can ignore them during upgrades or when reviewing changes to the codebase.
For example, adding unit tests or documentation would not be considered "noteworthy".
Same goes for version control plumbing like merges, file renames or reverts.
Further guidelines:
* Each commit should form a logical unit - if you fix two unrelated bugs, commit each one separately
* If you are fixing a ticket from our [bugtracker](http://open.silverstripe.com), please append `(fixes #<ticketnumber>)`
* If your change is related to another commit, reference it with its abbreviated commit hash.
* Mention important changed classes and methods in the commit summary.
Example: Bad commit message
finally fixed this dumb rendering bug that Joe talked about ... LOL
also added another form field for password validation
Example: Good commit message
BUG Formatting through prepValueForDB()
Added prepValueForDB() which is called on DBField->writeToManipulation()
to ensure formatting of value before insertion to DB on a per-DBField type basis (fixes #1234).
Added documentation for DBField->writeToManipulation() (related to a4bd42fd).
<div class="hint" markdown="1">
Note: By supplying code in patches, tickets and pull requests,
you agree that is can be used in distributions and derivative works of SilverStripe CMS and associated modules, under the BSD license.
</div>
## Reporting Security Issues
Report security issues to [security@silverstripe.com](mailto:security@silverstripe.com). See our "[Release Process](release-process)" documentation for more info, and read our guide on [how to write secure code](/topics/security).
## Writing Documentation
Documentation for a software project is a continued and collaborative effort,
we encourage everybody to contribute, from simply fixing spelling mistakes, to writing recipes/howtos,
reviewing existing documentation, and translating the whole thing.
Modifying documentation requires basic [PHPDoc](http://en.wikipedia.org/wiki/PHPDoc) and
[Markdown](http://daringfireball.net/projects/markdown/)/[SSMarkdown](ss-markdown) knowledge,
and a GitHub user account.
### Editing online
The easiest way of making a change the the documentation is to find the appropriate .md
file in the [github.com/silverstripe/sapphire](https://github.com/silverstripe/sapphire/edit/3.0/docs/) repository
and press the "edit" button. You will need a GitHub account to do this.
* After you have made your change, describe it in the "commit summary" and "extended description" fields below, and press "Commit Changes".
* After that you will see form to submit a Pull Request. You should just be able to submit the form, and your changes will be sent to the core team for approval.
**Coming soon:** each documentation page will have an "edit" link, to make it easier for you to find this feature.
### Editing on your computer
If you prefer to edit the content on your local machine, you can "[fork](http://help.github.com/forking/)"
the [github.com/silverstripe/sapphire](http://github.com/silverstripe/sapphire)
and [github.com/silverstripe/silverstripe-cms](http://github.com/silverstripe/silverstripe-cms)
repositories and send us "[pull requests](http://help.github.com/pull-requests/)". If you have
downloaded SilverStripe or a module, chances are that you already have these checkouts.
The documentation is kept alongside the source code in the `docs/` subfolder.
**Note:** If you submit a new feature or an API change, we strongly recommend that your patch
includes updates to the necessary documentation. This helps prevent our documentation from
getting out of date.
### Repositories
* End-user: [userhelp.silverstripe.org](http://userhelp.silverstripe.org) - a custom SilverStripe project (not open sourced at the moment).
* Developer Guides: [doc.silverstripe.org](http://doc.silverstripe.org) - powered by a
SilverStripe project that uses the ["sapphiredocs" module](https://github.com/silverstripe/silverstripe-sapphiredocs)
to convert Markdown formatted files into searchable HTML pages with index lists.
Its contents are fetched from different releases automatically every couple of minutes.
* Developer API Docuumentation: [api.silverstripe.org](http://api.silverstripe.org) - powered by a customized
[phpDocumentor](http://www.phpdoc.org/) template, and is regenerated automatically every night.
### Source Control
In order to balance editorial control with effective collaboration, we keep
documentation alongside the module source code, e.g. in `framework/docs/`,
or as code comments within PHP code.
Contributing documentation is the same process as providing any other patch
(see [Patches and Bugfixes](contributing#submitting-patches-bugfixes-and-enhancements)).
### What to write
* **API Docs**: Written alongside source code and displayed on [api.silverstripe.com](http://api.silverstripe.org).
This documents the low-level, technical usage of a class, method or property.
Not suited for longer textual descriptions, due to the limited support of PHPDoc formatting for headlines.
* **Tutorials**: The first contact for new users, guiding them step-by-step through achievable projects, in a book-like style.
*Example: Building a basic site*
* **Topics**: Provides an overview on how things fit together, the "conceptual glue" between APIs and features.
This is where most documentation should live, and is the natural "second step" after finishing the tutorials.
*Example: Templates, Testing, Datamodel*
* **Howto**: Recipes that solve a specific task or problem, rather than describing a feature.
*Example: Export DataObjects as CSV, Customizing TinyMCE in the CMS*
* **Reference**: Complements API docs in providing deeper introduction into a specific API. Most documentation
should fit elsewhere. *Example: ModelAdmin*
* **Misc**: "Meta" documentation like coding conventions that doesn't directly relate to a feature or API.
See [What to write (jacobian.org)](http://jacobian.org/writing/great-documentation/what-to-write/) for an excellent
introduction to the different types of documentation, and [Producing OSS: "Documentation"](http://producingoss.com/en/getting-started.html#documentation)
for good rules of thumb for documenting opensource software.
### Structure
* Don't duplicate: Search for existing places to put your documentation. Do you really require a new page, or just a new paragraph
of text somewhere?
* Use PHPDoc in source code: Leave lowlevel technical documentation to code comments within PHP, in [PHPDoc](http://en.wikipedia.org/wiki/PHPDoc) format.
* Use Markdown in Developer Guides: We have a slightly customized version of Markdown called [SSMarkdown](ss-markdown)
* API and Developer Guides complement each other: Both forms of documenting sourcecode (API and Developer Guides) are valueable ressources.
* Provide context: Give API documentation the "bigger picture" by referring to Developer Guides inside your PHPDoc.
* Make your documentation findable: Documentation lives by interlinking content, so please make sure your contribution doesn't become an
inaccessible island. Your page should at least be linked on the index page in the same folder. It can also appear
as "related content" on other resource (e.g. `/topics/search` might link to `howto/search-dataobjects`).
* Avoid FAQs: FAQs are not a replacement of a coherent, well explained documentation. If you've done a good job
documenting, there shouldn't be any "frequently asked questions" left ;)
* Commit early and often: You don't need to completely finish documentation, as long as you mark areas needing refinement.
* Every file should have exactly one `<h1>` headline, roughly matching the filename. It should be short enough to be
used in table of content lists.
### Writing Style
* Write in second plural form: Use "we" instead of "I". It gives the text an instructive and collaborative style.
* Its okay to address the reader: For example "First you'll install a webserver" is good style.
* Write in an active and direct voice
* Mark up correctly: Use preformatted text, emphasis and bold to make technical writing more "scannable".
### Highlighted blocks ###
There are several built-in block styles for highlighting a paragraph of text.
Please use these graphical elements sparingly.
<div class="hint" markdown='1'>
"Tip box": Adds, deepens or accents information in the main text.
Can be used for background knowledge, or "see also" links.
</div>
Code:
<div class="hint" markdown='1'>
...
</div>
<div class="notice" markdown='1'>
"Notification box": Technical notifications relating to the main text.
For example, notifying users about a deprecated feature.
</div>
Code:
<div class="notice" markdown='1'>
...
</div>
<div class="warning" markdown='1'>
"Warning box": Highlight a severe bug or technical issue requiring
a users attention. For example, a code block with destructive functionality
might not have its URL actions secured to keep the code shorter.
</div>
Code:
<div class="warning" markdown='1'>
...
</div>
See [Markdown Extra Documentation](http://michelf.com/projects/php-markdown/extra/#html) for more restriction
on placing HTML blocks inside Markdown.
### Translating Documentation
Documentation is kept alongside the source code, typically in a module subdirectory like `framework/docs/en/`.
Each language has its own subfolder, which can duplicate parts or the whole body of documentation.
German documentation would for example live in `framework/docs/de/`.
The [sapphiredocs](https://github.com/silverstripe/silverstripe-sapphiredocs) module that drives
[doc.silverstripe.org](http://doc.silverstripe.org) automatically resolves these subfolders into a language dropdown.
### Further reading
* [Writing great documentation (jacobian.org)](http://jacobian.org/writing/great-documentation/)
* [How tech writing sucks: Five Sins](http://www.slash7.com/articles/2006/11/15/tech-writing-the-five-sins)
* [What is good documentation?](http://www.techscribe.co.uk/techw/whatis.htm)
## Translating the User Interface
The content for UI elements (button labels, field titles) and instruction texts shown in the CMS and
elsewhere is stored in the PHP code for a module (see [i18n](/topics/i18n)).
All content can be extracted as a "language file", and uploaded to an online translation editor interface.
SilverStripe is already translated in over 60 languages, and we're relying on native speakers
to keep these up to date, and of course add new languages.
Please [register](translation-process) a free translator account to get started,
even if you just feel like fixing up a few sentences.
See [our translation workflow](translation-process) for more details.
## Related
* [Installation: From Source](/installation/from-source)
* [Collaboration on Git](/misc/collaboration-on-git)

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# Contributing Code - Submiting Bugfixes and Enhancements
SilverStripe will never be finished, and we need your help to keep making it better. If you're a developer a great way to get involved is to contribute patches to our modules and core codebase, fixing bugs or adding feautres.
The SilverStripe core modules (`framework` and `cms`), as well as some of the more popular modules are in
git version control. SilverStripe hosts its modules on [github.com/silverstripe](http://github.com/silverstripe) and [github.com/silverstripe-labs](http://github.com/silverstripe-labs). After [installing git](http://help.github.com/git-installation-redirect) and creating a [free github.com account](https://github.com/signup/free), you can "fork" a module,
which creates a copy that you can commit to (see github's [guide to "forking"](http://help.github.com/forking/)).
For other modules, our [module list on silverstripe.org](http://silverstripe.org/modules) lists the repository locations, typically using a version control system like "git" or "[subversion](subversion)".
## Step-by-step: From forking to sending the pull request
1. Follow the [Installation for contributions](../../installation/from-source#option-2-installation-for-contributions) instructions, which explain how to fork the core modules and add the correct "upstream" remote.
1. [Branch for new issue and develop on issue branch](code#branch-for-new-issue-and-develop-on-issue-branch)
$ git branch ###-description
$ git checkout ###-description
1. As time passes, the upstream repository accumulates new commits. Keep your working copy's master branch and issue branch up to date by periodically [rebasing your development branch on the latest upstream](code#rebase-your-development-branch-on-the-latest-upstream).
$ git fetch upstream
$ git checkout master
$ git rebase upstream/master
$ git checkout ###-description
$ git rebase master
1. When development is complete, rebase one more time, then branch from dev branch to release candidate branch.
$ git checkout ###-description
$ git branch ###-description-rc
$ git checkout ###-description-rc
1. Then [squash all commit related to a single issue into a single commit](code#squash-all-commits-related-to-a-single-issue-into-a-single-commit).
$ git fetch upstream
$ git rebase -i upstream/master
1. Push release candidate branch to GitHub (`$ git push origin ###-description-rc`)
1. Issue pull request on GitHub (Click Pull Request button)
The core team is then responsible for reviewing patches and deciding if they will make it into core. If
there are any problems they will follow up with you, so please ensure they have a way to contact you!
### Workflow Diagram ###
![Workflow diagram](http://www.silverstripe.org/assets/doc-silverstripe-org/collaboration-on-github.png)
### Quickfire Do's and Don't's
If you aren't familiar with git and GitHub, try reading the ["GitHub bootcamp documentation"](http://help.github.com/).
We also found the [free online git book](http://progit.org/book/) and the [git crash course](http://gitref.org/) useful.
If you're familiar with it, here's the short version of what you need to know. Once you fork and download the code:
* **Don't develop on the master branch.** Always create a development branch specific to "the issue" you're working on (mostly on [open.silverstripe.org](http://open.silverstripe.org)). Name it by issue number and description. For example, if you're working on Issue #100, a `DataObject::get_one()` bugfix, your development branch should be called 100-dataobject-get-one. If you decide to work on another issue mid-stream, create a new branch for that issue--don't work on both in one branch.
* **Do not merge the upstream master** with your development branch; *rebase* your branch on top of the upstream master.
* **A single development branch should represent changes related to a single issue.** If you decide to work on another issue, create another branch.
* **Squash your commits.** After you rebase your work on top of the upstream master, you can squash multiple commits into one. Say, for instance, you've got three commits in related to Issue #100. Squash all three into one with the message "Issue #100 Description of the issue here." We won't accept pull requests for multiple commits related to a single issue; it's up to you to squash and clean your commit tree. (Remember, if you squash commits you've already pushed to GitHub, you won't be able to push that same branch again. Create a new local branch, squash, and push the new squashed branch.)
### Editing files directly on GitHub.com
If you see a typo or another small fix that needs to be made, and you don't have an installation set up for contributions, you can edit files directly in the github.com web interface. Every file view has an "edit this file" link.
After you have edited the file, GitHub will offer to create a pull request for you. This pull request will be reviewed along with other pull requests.
## Check List
* Adhere to our [coding conventions](coding-conventions)
* If your patch is extensive, discuss it first on the [silverstripe forum](http///www.silverstripe.org/forums/) (ideally before doing any serious coding)
* When working on existing tickets, assign them to you and provide status updates through ticket comments
* Check your patches against the latest "trunk" or "master", as well as the latest release.
Please not that the latest stable release will often not be sufficient! (of all modules)
* Provide complete [unit test coverage](/topics/testing) - depending on the complexity of your work, this is a required
step.
* Do not set milestones. If you think your patch should be looked at with priority, mark it as "critical".
* Describe specifics on how to test the effects of the patch
* It's better to submit multiple patches with separate bits of functionality than a big patch containing lots of
changes
* Document your code inline through [PHPDoc](http://en.wikipedia.org/wiki/PHPDoc) syntax. See our
[API documentation](http://api.silverstripe.org/trunk) for good examples.
* Also check and update documentation on [doc.silverstripe.org](http://doc.silverstripe.org). Check for any references to functionality deprecated or extended through your patch. Documentation changes should be included in the patch.
* We will attribute the change to you whereever possible (git does this automatically for pull requests)
* If you get stuck, please post to the [forum](http://silverstripe.org/forum) or for deeper core problems, to the [core mailinglist](https://groups.google.com/forum/#!forum/silverstripe-dev)
* When working with the CMS, please read the ["CMS Architecture Guide"](/reference/cms-architecture) first
## Commit Messages
We try to maintain a consistent record of descriptive commit messages.
Most importantly: Keep the first line short, and add more detail below.
This ensures commits are easy to browse, and look nice on github.com
(more info about [proper git commit messages](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html)).
As we automatically generate [changelogs](http://doc.silverstripe.org/sapphire/en/trunk/changelogs/) from them, we need a way to categorize and filter.
Please prefix **noteworthy** commit messages with one of the following tags:
* `NEW`: New feature or major enhancement (both for users and developers)
* `API`: Addition of a new API, or modification/removal/deprecation of an existing API.
Includes any change developers should be aware of when upgrading.
* `BUG`: Bugfix or minor enhancement on something developers or users are likely to encounter.
All other commits should not be tagged if they are so trivial that most developers
can ignore them during upgrades or when reviewing changes to the codebase.
For example, adding unit tests or documentation would not be considered "noteworthy".
Same goes for version control plumbing like merges, file renames or reverts.
Further guidelines:
* Each commit should form a logical unit - if you fix two unrelated bugs, commit each one separately
* If you are fixing a ticket from our [bugtracker](http://open.silverstripe.com), please append `(fixes #<ticketnumber>)`
* If your change is related to another commit, reference it with its abbreviated commit hash.
* Mention important changed classes and methods in the commit summary.
Example: Bad commit message
finally fixed this dumb rendering bug that Joe talked about ... LOL
also added another form field for password validation
Example: Good commit message
BUG Formatting through prepValueForDB()
Added prepValueForDB() which is called on DBField->writeToManipulation()
to ensure formatting of value before insertion to DB on a per-DBField type basis (fixes #1234).
Added documentation for DBField->writeToManipulation() (related to a4bd42fd).
<div class="hint" markdown="1">
Note: By supplying code in patches, tickets and pull requests,
you agree that is can be used in distributions and derivative works of SilverStripe CMS and associated modules, under the BSD license.
</div>
## The steps in more detail
### Branch for new issue and develop on issue branch
Before you start working on a new feature or bugfix, create a new branch dedicated to that one change named by issue number and description. If you're working on Issue #100, a retweet bugfix, create a new branch with the issue number and description, like this:
$ git branch 100-dataobject-get-one
$ git checkout 100-dataobject-get-one
Edit and test the files on your development environment. When you've got something the way you want and established that it works, commit the changes to your branch on your local git repo.
$ git add <filename>
$ git commit -m 'Issue #100: Some kind of descriptive message'
You'll need to use git add for each file that you created or modified. There are ways to add multiple files, but I highly recommend a more deliberate approach unless you know what you're doing.
Then, you can push your new branch to GitHub, like this (replace `100-dataobject-get-one` with your branch name):
$ git push origin 100-dataobject-get-one
You should be able to log into your GitHub account, switch to the branch, and see that your changes have been committed. Then click the Pull button to request that your commits get merged into the development master.
*IMPORTANT*: Before you issue a pull request, make sure it gets accepted by running through the ["Contributing Check List"](contributing#check-list).
### Rebase Your Development Branch on the Latest Upstream
To keep your development branch up to date, rebase your changes on top of the current state of the upstream master. See the [What is git rebase?](code#what-is-git-rebase) section below to learn more about rebasing.
If you've set up an upstream branch as detailed above, and a development branch called `100-dataobject-get-one`, you'd update `upstream`, update your local master, and rebase your branch from it like so:
$ git fetch upstream
$ git checkout master
$ git rebase upstream/master
$ git checkout 100-dataobject-get-one
# [make sure all is committed as necessary in branch]
$ git rebase master
You may need to resolve conflicts that occur when a file on the development trunk and one of your files have both been changed. Edit each file to resolve the differences, then commit the fixes to your development server repo and test. Each file will need to be "added" before running a "commit."
Conflicts are clearly marked in the code files. Make sure to take time in determining what version of the conflict you want to keep and what you want to discard.
$ git add <filename>
$ git commit
To push the updates to your GitHub repo, replace 100-dataobject-get-one with your branch name and run:
$ git push origin 100-dataobject-get-one
### Squash All Commits Related to a Single Issue into a Single Commit
Once you have rebased your work on top of the latest state of the upstream master, you may have several commits related to the issue you were working on. Once everything is done, squash them into a single commit with a descriptive message (see ["Contributing: Commit Messages"](contributing#commit-messages)).
To squash four commits into one, do the following:
$ git rebase -i HEAD~4
In the text editor that comes up, replace the words "pick" with "squash" next to the commits you want to squash into the commit before it. Save and close the editor, and git will combine the "squash"'ed commits with the one before it. Git will then give you the opportunity to change your commit message to something like, "BUGFIX Issue #100: Fixed DataObject::get_one() parameter order"
Important: If you've already pushed commits to GitHub, and then squash them locally, you will not be able to push that same branch to GitHub again. Create a new branch--like 100-dataobject-get-one-squashed or 100-dataobject-get-one-rc1 (for "release candidate 1") - and squash your commits there. Once everything is squashed and ready, push the new squashed branch to GitHub and send your pull request to Gina.
Helpful hint: You can always edit your last commit message by using:
$ git commit --amend
## Some gotchas
Be careful not to commit any of your configuration files, logs, or throwaway test files to your GitHub repo. These files can contain information you wouldn't want publicly viewable and they will make it impossible to merge your contributions into the main development trunk.
Most of these special files are listed in the `.gitignore` file and won't be included in any commit, but you should carefully review the files you have modified and added before staging them and committing them to your repo. The git status command will display detailed information about any new files, modifications and staged.
$ git status
One thing you do not want to do is to issue a git commit with the -a option. This automatically stages and commits every modified file that's not expressly defined in .gitignore, including your crawler logs.
$ git commit -a
## What is git rebase?
Using `git rebase` helps create clean commit trees and makes keeping your code up-to-date with the current state of the upstream master easy. Here's how it works.
Let's say you're working on Issue #212 a new plugin in your own branch and you start with something like this:
1---2---3 #212-my-new-plugin
/
A---B #master
You keep coding for a few days and then pull the latest upstream stuff and you end up like this:
1---2---3 #212-my-new-plugin
/
A---B--C--D--E--F #master
So all these new things (C,D,..F) have happened since you started. Normally you would just keep going (let's say you're not finished with the plugin yet) and then deal with a merge later on, which becomes a commit, which get moved upstream and ends up grafted on the tree forever.
A cleaner way to do this is to use rebase to essentially rewrite your commits as if you had started at point F instead of point B. So just do:
git rebase master 212-my-new-plugin
git will rewrite your commits like this:
1---2---3 #212-my-new-plugin
/
A---B--C--D--E--F #master
It's as if you had just started your branch. One immediate advantage you get is that you can test your branch now to see if C, D, E, or F had any impact on your code (you don't need to wait until you're finished with your plugin and merge to find this out). And, since you can keep doing this over and over again as you develop your plugin, at the end your merge will just be a fast-forward (in other words no merge at all).
So when you're ready to send the new plugin upstream, you do one last rebase, test, and then merge (which is really no merge at all) and send out your pull request. Then in most cases, we have a simple fast-forward on our end (or at worst a very small rebase or merge) and over time that adds up to a simpler tree.
More info on the ["Rebasing" chapter on progit.org](http://progit.org/book/ch3-6.html) and the [git rebase man page](http://www.kernel.org/pub/software/scm/git/docs/git-rebase.html).
## License
Portions of this guide have been adapted from the ["Thinkup" developer guide](https://github.com/ginatrapani/ThinkUp/wiki/Developer-Guide%3A-Get-the-Source-Code-from-GitHub-and-Keep-It-Updated),
with friendly permission from Gina Trapani/[thinkupapp.com](http://thinkupapp.com).

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# Contributing Documentation
[« Back to Contributing page](.)
Documentation for a software project is a continued and collaborative effort,
we encourage everybody to contribute, from simply fixing spelling mistakes, to writing recipes/howtos,
reviewing existing documentation, and translating the whole thing.
Modifying documentation requires basic [PHPDoc](http://en.wikipedia.org/wiki/PHPDoc) and
[Markdown](http://daringfireball.net/projects/markdown/)/[SSMarkdown](../ss-markdown) knowledge,
and a GitHub user account.
## Editing online
The easiest way of making a change the the documentation is to find the appropriate .md
file in the [github.com/silverstripe/sapphire](https://github.com/silverstripe/sapphire/edit/3.0/docs/) repository
and press the "edit" button. You will need a GitHub account to do this.
* After you have made your change, describe it in the "commit summary" and "extended description" fields below, and press "Commit Changes".
* After that you will see form to submit a Pull Request. You should just be able to submit the form, and your changes will be sent to the core team for approval.
Each documentation page has have an "edit" link, to make it easier for you to find this feature.
## Editing on your computer
If you prefer to edit the content on your local machine, you can "[fork](http://help.github.com/forking/)"
the [github.com/silverstripe/sapphire](http://github.com/silverstripe/sapphire)
and [github.com/silverstripe/silverstripe-cms](http://github.com/silverstripe/silverstripe-cms)
repositories and send us "[pull requests](http://help.github.com/pull-requests/)". If you have
downloaded SilverStripe or a module, chances are that you already have these checkouts.
The documentation is kept alongside the source code in the `docs/` subfolder.
**Note:** If you submit a new feature or an API change, we strongly recommend that your patch
includes updates to the necessary documentation. This helps prevent our documentation from
getting out of date.
## Repositories
* End-user: [userhelp.silverstripe.org](http://userhelp.silverstripe.org) - a custom SilverStripe project (not open sourced at the moment).
* Developer Guides: [doc.silverstripe.org](http://doc.silverstripe.org) - powered by a
SilverStripe project that uses the ["sapphiredocs" module](https://github.com/silverstripe/silverstripe-sapphiredocs)
to convert Markdown formatted files into searchable HTML pages with index lists.
Its contents are fetched from different releases automatically every couple of minutes.
* Developer API Docuumentation: [api.silverstripe.org](http://api.silverstripe.org) - powered by a customized
[phpDocumentor](http://www.phpdoc.org/) template, and is regenerated automatically every night.
## Source Control
In order to balance editorial control with effective collaboration, we keep
documentation alongside the module source code, e.g. in `framework/docs/`,
or as code comments within PHP code.
Contributing documentation is the same process as providing any other patch
(see [Patches and Bugfixes](contributing#submitting-patches-bugfixes-and-enhancements)).
## What to write
* **API Docs**: Written alongside source code and displayed on [api.silverstripe.com](http://api.silverstripe.org).
This documents the low-level, technical usage of a class, method or property.
Not suited for longer textual descriptions, due to the limited support of PHPDoc formatting for headlines.
* **Tutorials**: The first contact for new users, guiding them step-by-step through achievable projects, in a book-like style.
*Example: Building a basic site*
* **Topics**: Provides an overview on how things fit together, the "conceptual glue" between APIs and features.
This is where most documentation should live, and is the natural "second step" after finishing the tutorials.
*Example: Templates, Testing, Datamodel*
* **Howto**: Recipes that solve a specific task or problem, rather than describing a feature.
*Example: Export DataObjects as CSV, Customizing TinyMCE in the CMS*
* **Reference**: Complements API docs in providing deeper introduction into a specific API. Most documentation
should fit elsewhere. *Example: ModelAdmin*
* **Misc**: "Meta" documentation like coding conventions that doesn't directly relate to a feature or API.
See [What to write (jacobian.org)](http://jacobian.org/writing/great-documentation/what-to-write/) for an excellent
introduction to the different types of documentation, and [Producing OSS: "Documentation"](http://producingoss.com/en/getting-started.html#documentation)
for good rules of thumb for documenting opensource software.
## Structure
* Don't duplicate: Search for existing places to put your documentation. Do you really require a new page, or just a new paragraph
of text somewhere?
* Use PHPDoc in source code: Leave lowlevel technical documentation to code comments within PHP, in [PHPDoc](http://en.wikipedia.org/wiki/PHPDoc) format.
* Use Markdown in Developer Guides: We have a slightly customized version of Markdown called [SSMarkdown](../ss-markdown)
* API and Developer Guides complement each other: Both forms of documenting sourcecode (API and Developer Guides) are valueable ressources.
* Provide context: Give API documentation the "bigger picture" by referring to Developer Guides inside your PHPDoc.
* Make your documentation findable: Documentation lives by interlinking content, so please make sure your contribution doesn't become an
inaccessible island. Your page should at least be linked on the index page in the same folder. It can also appear
as "related content" on other resource (e.g. `/topics/search` might link to `howto/search-dataobjects`).
* Avoid FAQs: FAQs are not a replacement of a coherent, well explained documentation. If you've done a good job
documenting, there shouldn't be any "frequently asked questions" left ;)
* Commit early and often: You don't need to completely finish documentation, as long as you mark areas needing refinement.
* Every file should have exactly one `<h1>` headline, roughly matching the filename. It should be short enough to be
used in table of content lists.
## Writing Style
* Write in second plural form: Use "we" instead of "I". It gives the text an instructive and collaborative style.
* Its okay to address the reader: For example "First you'll install a webserver" is good style.
* Write in an active and direct voice
* Mark up correctly: Use preformatted text, emphasis and bold to make technical writing more "scannable".
## Highlighted blocks
There are several built-in block styles for highlighting a paragraph of text.
Please use these graphical elements sparingly.
<div class="hint" markdown='1'>
"Tip box": Adds, deepens or accents information in the main text.
Can be used for background knowledge, or "see also" links.
</div>
Code:
<div class="hint" markdown='1'>
...
</div>
<div class="notice" markdown='1'>
"Notification box": Technical notifications relating to the main text.
For example, notifying users about a deprecated feature.
</div>
Code:
<div class="notice" markdown='1'>
...
</div>
<div class="warning" markdown='1'>
"Warning box": Highlight a severe bug or technical issue requiring
a users attention. For example, a code block with destructive functionality
might not have its URL actions secured to keep the code shorter.
</div>
Code:
<div class="warning" markdown='1'>
...
</div>
See [Markdown Extra Documentation](http://michelf.com/projects/php-markdown/extra/#html) for more restriction
on placing HTML blocks inside Markdown.
## Translating Documentation
Documentation is kept alongside the source code, typically in a module subdirectory like `framework/docs/en/`.
Each language has its own subfolder, which can duplicate parts or the whole body of documentation.
German documentation would for example live in `framework/docs/de/`.
The [sapphiredocs](https://github.com/silverstripe/silverstripe-sapphiredocs) module that drives
[doc.silverstripe.org](http://doc.silverstripe.org) automatically resolves these subfolders into a language dropdown.
## Further reading
* [Writing great documentation (jacobian.org)](http://jacobian.org/writing/great-documentation/)
* [How tech writing sucks: Five Sins](http://www.slash7.com/articles/2006/11/15/tech-writing-the-five-sins)
* [What is good documentation?](http://www.techscribe.co.uk/techw/whatis.htm)

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# Contributing
Any open source product is only as good as the community behind it. You can participate by sharing
code, ideas, or simply helping others. No matter what your skill level is, every contribution counts.
See our [high level overview on silverstripe.org](http://silverstripe.org/contributing-to-silverstripe) on how you can help out.
Or, for more detailed guidance, read one of the following pages:
* [Sharing your **opinion** and raising **issues**](issues)
* [Providing **code**, whether it's creating a feature or fixing a bug](code)
* [Writing and translating **documentation**](documentation)
* [**Translating** user-interface elements](translation)

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# Contributing Issues and Opinions
[« Back to Contributing page](../contributing)
## Reporting Bugs
If you have discovered a bug in SilverStripe, we'd be glad to hear about it -
well written bug reports can be half of the solution already!
Our bugtracker is located on [open.silverstripe.org](http://open.silverstripe.org/) (create a [new ticket](http://open.silverstripe.org/newticket)).
## Reporting Security Issues
Report security issues to [security@silverstripe.com](mailto:security@silverstripe.com). See our "[Release Process](release-process)" documentation for more info, and read our guide on [how to write secure code](/topics/security).
## Sharing your Opinion
* [silverstripe.org/forums](http://silverstripe.org/forums): Forums on silverstripe.org
* [silverstripe-dev](http://groups.google.com/group/silverstripe-dev): Core development mailinglist
* [silverstripe-documentation](http://groups.google.com/group/silverstripe-documentation): Documentation team mailing list

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## Contributing Translations for the User Interface
[« Back to Contributing page](../contributing)
The content for UI elements (button labels, field titles) and instruction texts shown in the CMS and
elsewhere is stored in the PHP code for a module (see [i18n](/topics/i18n)).
All content can be extracted as a "language file", and uploaded to an online translation editor interface.
SilverStripe is already translated in over 60 languages, and we're relying on native speakers
to keep these up to date, and of course add new languages.
Please [register](translation-process) a free translator account to get started,
even if you just feel like fixing up a few sentences.
See [our translation workflow](translation-process) for more details.