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programming-books/CONTRIBUTING.md

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## Contributor License Agreement
By contributing you agree to the [LICENSE](https://github.com/EbookFoundation/free-programming-books/blob/master/LICENSE) of this repository.
## Contributor Code of Conduct
By contributing you agree to respect the [Code of Conduct](https://github.com/EbookFoundation/free-programming-books/blob/master/CODE_OF_CONDUCT.md) of this repository.
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## In a nutshell
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1. "A link to easily download a book" is not always a link to a *free* book. Please only contribute free content. Make sure it's free.
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2. You don't have to know git: if you found something of interest which is *not already in this repo*, please open an issue with your links propositions.
- If you know git, please fork the repo and send pull requests.
3. We have 5 kinds of lists. Choose the right one:
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- *Books* : PDF, HTML, ePub, a gitbook.io based site, a Git repo, etc.
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- *Courses* : A course is a learning material which is not a book and where there is no interactive tool embedded in the site. [This is a course](http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-006-introduction-to-algorithms-fall-2011/).
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- *Interactive Tutorials* : An interactive website which lets the user type code or commands and evaluates the result (by "evaluate" we don't mean "grade"). e.g.: [Try Haskell](http://tryhaskell.org), [Try Github](http://try.github.io).
- *JavaScript Resources* : Any resources teaching a JavaScript framework or library.
- *Problem Sets & Competitive Programming* : A website or software which lets you assess your programming skills by solving simple or complex problems, with or without code review, with or without comparing the results with other users.
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4. Make sure to follow the [guidelines below](#guidelines) and respect the [Markdown formatting](#formatting) of the files
5. Travis CI will run tests to make sure your lists are alphabetized and formatting rules are followed. Be sure to check that your changes pass the tests.
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### Guidelines
- make sure a book is free. Double-check if needed. It helps the admins if you comment in the PR as to why you think the book is free.
- we don't accept files hosted on google drive, dropbox, mega, scribd, issuu and other similar file upload platforms
- insert your links in alphabetical order. If you see a misplaced link, please reorder it and submit a PR
- use the link with the most authoritative source (meaning author's website is better than editor's website is better than third party website)
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+ no file hosting services (this includes (but is not limited to) Dropbox and Google Drive links)
- always prefer a `https` link over a `http` one -- as long as they are on the same domain and serve the same content
- on root domains, strip the trailing slash: `http://example.com` instead of `http://example.com/`
- always prefer the shortest link: `http://example.com/dir/` is better than `http://example.com/dir/index.html`
+ no URL shortener links
- usually prefer the "current" link over the "version" one: `http://example.com/dir/book/current/` is better than `http://example.com/dir/book/v1.0.0/index.html`
- if a link has an expired certificate/self-signed certificate/SSL issue of any other kind:
1. *replace it* with its `http` counterpart if possible (because accepting exceptions can be complicated on mobile devices)
2. *leave it* if no `http` version but link still accessible through `https` by adding an exception to the browser or ignoring the warning
3. *remove it* otherwise
- if a link exists in multiple format, add a separate link with a note about each format
- if a resource exists at different places on the Internet
+ use the link with the most authoritative source (meaning author's website is better than editor's website is better than third party website)
+ if they link to different editions and you judge these editions are different enough to be worth keeping them, add a separate link with a note about each edition (see [Issue #2353](https://github.com/EbookFoundation/free-programming-books/issues/2353) to contribute to the discussion on formatting.)
- prefer atomic commits (one commit by addition/deletion/modification) over bigger commits. No need to squash your commits before submitting a PR. (We will never enforce this rule as it's just a matter of convenience for the maintainers)
- if the book is older, include the publication date with the title.
- include the author name or names where appropriate. You can shorten author lists with "et al."
- if the book is not finished, and is still being worked on, add the "in process" notation, as described [below.](#in_process)
### Formatting
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- All lists are `.md` files. Try to learn [Markdown](https://guides.github.com/features/mastering-markdown/) syntax. It's simple!
- All the lists start with an Index. The idea is to list and link all sections and subsections there. Keep it in alphabetical order.
- Sections are using level 3 headings (`###`), and subsections are level 4 headings (`####`).
The idea is to have
- `2` empty lines between last link and new section
- `1` empty line between heading & first link of its section
- `0` empty line between two links
- `1` empty line at the end of each `.md` file
Example:
[...]
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* [An Awesome Book](http://example.com/example.html)
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(blank line)
(blank line)
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### Example
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(blank line)
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* [Another Awesome Book](http://example.com/book.html)
* [Some Other Book](http://example.com/other.html)
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- Don't put spaces between `]` and `(`
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```
BAD : * [Another Awesome Book] (http://example.com/book.html)
GOOD: * [Another Awesome Book](http://example.com/book.html)
```
- If you include the author, use ` - ` (a dash surrounded by single spaces)
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```
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BAD : * [Another Awesome Book](http://example.com/book.html)- John Doe
GOOD: * [Another Awesome Book](http://example.com/book.html) - John Doe
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```
- Put a single space between the link and its format
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```
BAD : * [A Very Awesome Book](https://example.org/book.pdf)(PDF)
GOOD: * [A Very Awesome Book](https://example.org/book.pdf) (PDF)
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```
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- Author comes before format:
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```
BAD : * [A Very Awesome Book](https://example.org/book.pdf)- Jane Roe
GOOD: * [A Very Awesome Book](https://example.org/book.pdf) - Jane Roe (PDF)
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```
- Multiple formats:
```
BAD : * [Another Awesome Book](http://example.com/)- John Doe (HTML)
BAD : * [Another Awesome Book](https://downloads.example.org/book.html)- John Doe (download site)
GOOD: * [Another Awesome Book](http://example.com/) - John Doe (HTML) [(PDF, EPUB)](https://downloads.example.org/book.html)
```
- Include publication year in title for older books:
```
BAD: * [A Very Awesome Book](https://example.org/book.html) - Jane Roe - 1970
GOOD: * [A Very Awesome Book (1970)](https://example.org/book.html) - Jane Roe
```
<a name="in_process"></a>
- In-process books
```
GOOD: * [Will Be Awesome Soon Book](http://example.com/book2.html) - John Doe (HTML) (:construction: *in process*)
```