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Extract contributing guide into CONTRIBUTING.md
While at it, refactor the guide for clarity. Some of the new text was taken from erlware/relx/CONTRIBUTING.md and modified as needed.
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Tuncer Ayaz
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CONTRIBUTING.md
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CONTRIBUTING.md
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Contributing to rebar
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---------------------
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Before implementing a new feature, you should submit a ticket for discussion on your plans.
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The feature might have been rejected already, or the implementation might already be decided.
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See [Community and Resources](README.md#community-and-resources).
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Code style
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----------
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The following rules must be followed:
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* Do not introduce trailing whitespace
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* Do not mix spaces and tabs
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* Do not introduce lines longer than 80 characters
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The following rules should be followed:
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* Write small functions whenever possible
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* Avoid having too many clauses containing clauses containing clauses.
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Basically, avoid deeply nested functions.
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[erlang-mode (emacs)](http://www.erlang.org/doc/man/erlang.el.html)
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indentation is preferred. This will keep the code base consistent.
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vi users are encouraged to give [Vim emulation](http://emacswiki.org/emacs/Evil) ([more
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info](https://gitorious.org/evil/pages/Home)) a try.
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Pull requests and branching
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---------------------------
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Use one topic branch per pull request. If you do that, you can add extra commits or fix up
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buggy commits via `git rebase -i`, and update the branch. The updated branch will be
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visible in the same pull request. Therefore, you should not open a new pull request when
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you have to fix your changes.
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Do not commit to master in your fork.
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Provide a clean branch without merge commits.
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Committing your changes
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-----------------------
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Please ensure that all commits pass all tests, and do not have extra Dialyzer warnings.
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To do that run `make check`. If you didn't build via `make debug` at first, the beam files in
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`ebin/` might be missing debug_info required for [xref](http://www.erlang.org/doc/man/xref.html)
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and [Dialyzer](http://www.erlang.org/doc/man/dialyzer.html), causing a test
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failure.
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If that happens, running `make clean` before running `make check` could solve the problem.
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If you change any of the files with known but safe to ignore Dialyzer warnings, you may
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have to adapt the line number(s) in [dialyzer_reference](dialyzer_reference). If you do that,
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do not remove the
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leading blank line.
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#### Structuring your commits
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Fixing a bug is one commit.
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Adding a feature is one commit.
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Adding two features is two commits.
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Two unrelated changes is two commits.
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If you fix a (buggy) commit, squash (`git rebase -i`) the changes as a fixup commit into
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the original commit.
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#### Writing Commit Messages
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It's important to write a proper commit title and description. The commit title must be
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at most 50 characters; it is the first line of the commit text. The second line of the
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commit text must be left blank. The third line and beyond is the commit message. You
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should write a commit message. If you do, wrap all lines at 72 characters. You should
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explain what the commit does, what references you used, and any other information
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that helps understanding your changes.
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Basically, structure your commit message like this:
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<pre>
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One line summary (at most 50 characters)
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Longer description (wrap at 72 characters)
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</pre>
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##### Commit title/summary
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* At most 50 characters
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* What was changed
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* Imperative present tense (Fix, Add, Change)
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* `Fix bug 123`
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* `Add 'foobar' command`
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* `Change default timeout to 123`
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* No period
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##### Commit description
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* Wrap at 72 characters
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* Why, explain intention and implementation approach
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* Present tense
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72
README.md
72
README.md
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@ -51,77 +51,7 @@ and you can use rebar to build OTP-compliant apps.
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Contributing to rebar
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=====================
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Pull requests and branching
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---------------------------
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Use one topic branch per pull request.
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Do not commit to master in your fork.
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Provide a clean branch without any merge commits from upstream.
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Usually you should squash any intermediate commits into the original single commit.
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Code style
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----------
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Do not introduce trailing whitespace.
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Do not mix spaces and tabs.
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Do not introduce lines longer than 80 characters.
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[erlang-mode (emacs)](http://www.erlang.org/doc/man/erlang.el.html) indentation
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is preferred. vi-only users are encouraged to give [Vim
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emulation](http://emacswiki.org/emacs/Evil) ([more
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info](https://gitorious.org/evil/pages/Home)) a try.
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Writing Commit Messages
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-----------------------
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Structure your commit message like this:
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<pre>
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One line summary (less than 50 characters)
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Longer description (wrap at 72 characters)
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</pre>
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### Summary
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* Less than 50 characters
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* What was changed
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* Imperative present tense (fix, add, change)
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* `Fix bug 123`
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* `Add 'foobar' command`
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* `Change default timeout to 123`
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* No period
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### Description
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* Wrap at 72 characters
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* Why, explain intention and implementation approach
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* Present tense
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### Atomicity
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* Break up logical changes
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* Make whitespace changes separately
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Run checks
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----------
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Before you submit a patch, run ``make check`` to execute the test suite and
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check for [xref](http://www.erlang.org/doc/man/xref.html) and
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[Dialyzer](http://www.erlang.org/doc/man/dialyzer.html) warnings. You may have
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to run ``make clean`` first.
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[Dialyzer](http://www.erlang.org/doc/man/dialyzer.html) warnings are compared
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against a set of safe-to-ignore warnings found in
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[dialyzer_reference](https://raw.github.com/rebar/rebar/master/dialyzer_reference).
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[xref](http://www.erlang.org/doc/man/xref.html) is run with [custom
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queries](https://raw.github.com/rebar/rebar/master/rebar.config) to suppress
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safe-to-ignore warnings.
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Please refer to [CONTRIBUTING](CONTRIBUTING.md).
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Community and Resources
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-----------------------
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