thodg/libgit2/PROJECTS.md

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  Date : 2014-03-17T19:44:07
  

  Add a few projects to the list

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• PROJECTS.md

• Projects For LibGit2
  ====================
  
  So, you want to start helping out with `libgit2`? That's fantastic! We
  welcome contributions and we promise we'll try to be nice.
  
  This is a list of libgit2 related projects that new contributors can take
  on.  It includes a number of good starter projects and well as some larger
  ideas that no one is actively working on.
  
  ## Before You Start
  
  Please start by reading the README.md, CONTRIBUTING.md, and CONVENTIONS.md
  files before diving into one of these projects.  Those will explain our
  work flow and coding conventions to help ensure that your work will be
  easily integrated into libgit2.
  
  Next, work through the build instructions and make sure you can clone the
  repository, compile it, and run the tests successfully.  That will make
  sure that your development environment is set up correctly and you are
  ready to start on libgit2 development.
  
  ## Starter Projects
  
  These are good small projects to get started with libgit2.
  
  * Look at the `examples/` programs, find an existing one that mirrors a
    core Git command and add a missing command-line option.  There are many
    gaps right now and this helps demonstrate how to use the library.  Here
    are some specific ideas:
      * Fix the `examples/diff.c` implementation of the `-B`
        (a.k.a. `--break-rewrites`) command line option to actually look for
        the optional `[<n>][/<m>]` configuration values. There is an
        existing comment that reads `/* TODO: parse thresholds */`. The
        trick to this one will be doing it in a manner that is clean and
        simple, but still handles the various cases correctly (e.g. `-B/70%`
        is apparently a legal setting).
      * Implement the `--log-size` option for `examples/log.c`. I think all
        the data is available, you would just need to add the code into the
        `print_commit()` routine (along with a way of passing the option
        into that function).
      * For `examples/log.c`, implement any one of `--author=<...>`,
        `--committer=<...>`, or `--grep=<...>` but just use simple string
        match with `strstr()` instead of full regular expression
        matching. (I.e. I'm suggesting implementing this as if
        `--fixed-strings` was always turned on, because it will be a simpler
        project.)
      * As an extension to the matching idea for `examples/log.c`, add the
        `-i` option to use `strcasestr()` for matches.
      * For `examples/log.c`, implement the `--first-parent` option now that
        libgit2 supports it in the revwalk API.
  * Pick a Git command that is not already emulated in `examples/` and write
    a new example that mirrors the behavior.  Examples don't have to be
    perfect emulations, but should demonstrate how to use the libgit2 APIs
    to get results that are similar to Git commands.  This lets you (and us)
    easily exercise a particular facet of the API and measure compatability
    and feature parity with core git.
  * Submit a PR to clarify documentation! While we do try to document all of
    the APIs, your fresh eyes on the documentation will find areas that are
    confusing much more easily.
  * Add support for the symref protocol extension, so we don't guess
    what the remote's default branch is
    [#2006](https://github.com/libgit2/libgit2/issues/2006)
  
  If none of these appeal to you, take a look at our issues list to see if
  there are any unresolved issues you'd like to jump in on.
  
  ## Larger Projects
  
  These are ideas for larger projects mostly taken from our backlog of
  [Issues](https://github.com/libgit2/libgit2/issues).  Please don't dive
  into one of these as a first project for libgit2 - we'd rather get to
  know you first by successfully shipping your work on one of the smaller
  projects above.
  
  * Port part of the Git test suite to run against the command line emulation
    in examples/
  * Fix symlink support for files in the .git directory (i.e. don't overwrite
    the symlinks when writing the file contents back out)
  * Implement a 'git describe' like API
  * Add hooks API to enumerate and manage hooks (not run them at this point)
  * Isolate logic of ignore evaluation into a standalone API
  * Upgrade internal libxdiff code to latest from core Git
  * Add a hashtable lookup for files in the index instead of binary search
    every time
  * Make the index write the cache out to disk (with tests to gain
    confidence that the caching invalidation works correctly)
  * Have the tree builder use a hash table when building instead of a
    list.
  * Move the tagopt mechanism to the newer git 1.9 interpretation of
    --tags [#2120](https://github.com/libgit2/libgit2/issues/2120)
  

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