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114 lines
5.0 KiB
Plaintext
114 lines
5.0 KiB
Plaintext
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To Think About When Contributing Source Code
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This document is intended to offer some guidelines that can be useful to keep
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in mind when you decide to write a contribution to the project. This concerns
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new features as well as corrections to existing flaws or bugs.
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Join the Community
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Skip over to http://curl.haxx.se/mail/ and join the appropriate mailing
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list(s). Read up on details before you post questions. Read this file before
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you start sending patches!
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The License Issue
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When contributing with code, you agree to put your changes and new code under
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the same license curl and libcurl is already using unless stated otherwise.
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If you add a larger piece of code, you can opt to make that file or set of
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files to use a different license as long as they don't enforce any changes to
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the rest of the package and they make sense. Such "separate parts" can not be
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GPL (as we don't want the GPL virus to attack users of libcurl) but they must
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use "GPL compatible" licenses.
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What To Read
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Source code, the man pages, the INTERALS document, the TODO, the most recent
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CHANGES. Just lurking on the libcurl mailing list is gonna give you a lot of
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insights on what's going on right now.
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Naming
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Try using a non-confusing naming scheme for your new functions and variable
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names. It doesn't necessarily have to mean that you should use the same as in
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other places of the code, just that the names should be logical,
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understandable and be named according to what they're used for. File-local
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functions should be made static.
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Indenting
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Please try using the same indenting levels and bracing method as all the
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other code already does. It makes the source code a lot easier to follow if
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all of it is written using the same style. We don't ask you to like it, we
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just ask you to follow the tradition! ;-)
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Commenting
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Comment your source code extensively. Commented code is quality code and
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enables future modifications much more. Uncommented code much more risk being
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completely replaced when someone wants to extend things, since other persons'
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source code can get quite hard to read.
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General Style
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Keep your functions small. If they're small you avoid a lot of mistakes and
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you don't accidentally mix up variables.
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Non-clobbering All Over
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When you write new functionality or fix bugs, it is important that you don't
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fiddle all over the source files and functions. Remember that it is likely
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that other people have done changes in the same source files as you have and
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possibly even in the same functions. If you bring completely new
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functionality, try writing it in a new source file. If you fix bugs, try to
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fix one bug at a time and send them as separate patches.
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Separate Patches Doing Different Things
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It is annoying when you get a huge patch from someone that is said to fix 511
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odd problems, but discussions and opinions don't agree with 510 of them - or
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509 of them were already fixed in a different way. Then the patcher needs to
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extract the single interesting patch from somewhere within the huge pile of
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source, and that gives a lot of extra work. Preferably, all fixes that
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correct different problems should be in their own patch with an attached
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description exactly what they correct so that all patches can be selectively
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applied by the maintainer or other interested parties.
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Patch Against Recent Sources
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Please try to get the latest available sources to make your patches
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against. It makes the life of the developers so much easier. The very best is
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if you get the most up-to-date sources from the CVS repository, but the
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latest release archive is quite OK as well!
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Document
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Writing docs is dead boring and one of the big problems with many open source
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projects. Someone's gotta do it. It makes it a lot easier if you submit a
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small description of your fix or your new features with every contribution so
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that it can be swiftly added to the package documentation.
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Write Access to CVS Repository
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If you are a frequent contributor, or have another good reason, you can of
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course get write access to the CVS repository and then you'll be able to
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check-in all your changes straight into the CVS tree instead of sending all
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changes by mail as patches. Just ask if this is what you'd want. You will be
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required to have posted a few quality patches first, before you can be
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granted write access.
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Test Cases
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Since the introduction of the test suite, we can quickly verify that the main
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features are working as they're supposed to. To maintain this situation and
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improve it, all new features and functions that are added need to be tested
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in the test suite. Every feature that is added should get at least one valid
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test case that verifies that it works as documented. If every submitter also
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post a few test cases, it won't end up as a heavy burden on a single person!
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