thodg/libgit2

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  • Hash : d958e37a
    Author : Russell Belfer
    Date : 2013-05-17T17:21:45

    Fix issues with git_diff_find_similar There are a number of bugs in the rename code that only were obvious when I started testing it against large old repos with more complex patterns. (The code to do that testing is not ready to merge with libgit2, but I do plan to add more thorough tests.) This contains a significant number of changes and also tweaks the public API slightly to make emulating core git easier. Most notably, this separates the GIT_DIFF_FIND_AND_BREAK_REWRITES flag into FIND_REWRITES (which adds a self-similarity score to every modified file) and BREAK_REWRITES (which splits the modified deltas into add/remove pairs in the diff list). When you do a raw output of core git, rewrites show up as M090 or such, not at A and D output, so I wanted to be able to emulate that. Publicly, this also changes the flags to be uint16_t since we don't need values out of that range. Internally, this contains significant changes from a number of small bug fixes (like using the wrong side of the diff to decide if the object could be found in the ODB vs the workdir) to larger issues about which files can and should be compared and how the various edge cases of similarity scores should be treated. Honestly, I don't think this is the last update that will have to be made to this code, but I think this moves us closer to correct behavior and I tried to document the code so it would be easier to follow..

  • README.md

  • libgit2 - the Git linkable library

    Build Status

    libgit2 is a portable, pure C implementation of the Git core methods provided as a re-entrant linkable library with a solid API, allowing you to write native speed custom Git applications in any language with bindings.

    libgit2 is licensed under a very permissive license (GPLv2 with a special Linking Exception). This basically means that you can link it (unmodified) with any kind of software without having to release its source code.

    What It Can Do

    libgit2 is already very usable.

    • SHA conversions, formatting and shortening
    • abstracted ODB backend system
    • commit, tag, tree and blob parsing, editing, and write-back
    • tree traversal
    • revision walking
    • index file (staging area) manipulation
    • reference management (including packed references)
    • config file management
    • high level repository management
    • thread safety and reentrancy
    • descriptive and detailed error messages
    • …and more (over 175 different API calls)

    Building libgit2 - Using CMake

    libgit2 builds cleanly on most platforms without any external dependencies. Under Unix-like systems, like Linux, *BSD and Mac OS X, libgit2 expects pthreads to be available; they should be installed by default on all systems. Under Windows, libgit2 uses the native Windows API for threading.

    The libgit2 library is built using CMake 2.6+ (http://www.cmake.org) on all platforms.

    On most systems you can build the library using the following commands

    $ mkdir build && cd build
$ cmake ..
$ cmake --build .

    Alternatively you can point the CMake GUI tool to the CMakeLists.txt file and generate platform specific build project or IDE workspace.

    To install the library you can specify the install prefix by setting:

    $ cmake .. -DCMAKE_INSTALL_PREFIX=/install/prefix
$ cmake --build . --target install

    For more advanced use or questions about CMake please read http://www.cmake.org/Wiki/CMake_FAQ.

    The following CMake variables are declared:

    • BIN_INSTALL_DIR: Where to install binaries to.
    • LIB_INSTALL_DIR: Where to install libraries to.
    • INCLUDE_INSTALL_DIR: Where to install headers to.
    • BUILD_SHARED_LIBS: Build libgit2 as a Shared Library (defaults to ON)
    • BUILD_CLAR: Build Clar-based test suite (defaults to ON)
    • THREADSAFE: Build libgit2 with threading support (defaults to OFF)
    • STDCALL: Build libgit2 as stdcall. Turn off for cdecl (Windows; defaults to ON)

    Compiler and linker options

    CMake lets you specify a few variables to control the behavior of the compiler and linker. These flags are rarely used but can be useful for 64-bit to 32-bit cross-compilation.

    • CMAKE_C_FLAGS: Set your own compiler flags
    • CMAKE_FIND_ROOT_PATH: Override the search path for libraries
    • ZLIB_LIBRARY, OPENSSL_SSL_LIBRARY AND OPENSSL_CRYPTO_LIBRARY: Tell CMake where to find those specific libraries

    MacOS X

    If you want to build a universal binary for Mac OS X, CMake sets it all up for you if you use -DCMAKE_OSX_ARCHITECTURES="i386;x86_64" when configuring.

    Windows

    You need to run the CMake commands from the Visual Studio command prompt, not the regular or Windows SDK one. Select the right generator for your version with the `-G “Visual Studio X” option. See [the wiki] (https://github.com/libgit2/libgit2/wiki/Building-libgit2-on-Windows) for more detailed instructions. Language Bindings ================================== Here are the bindings to libgit2 that are currently available: C++ libqgit2, Qt bindings https://projects.kde.org/projects/playground/libs/libqgit2/ Chicken Scheme chicken-git https://wiki.call-cc.org/egg/git D dlibgit https://github.com/AndrejMitrovic/dlibgit Delphi GitForDelphi https://github.com/libgit2/GitForDelphi Erlang Geef https://github.com/schacon/geef Go go-git https://github.com/str1ngs/go-git GObject libgit2-glib https://live.gnome.org/Libgit2-glib Haskell hgit2 https://github.com/fpco/gitlib Lua luagit2 https://github.com/libgit2/luagit2 .NET libgit2net, low level bindings https://github.com/txdv/libgit2net libgit2sharp https://github.com/libgit2/libgit2sharp Node.js node-gitteh https://github.com/libgit2/node-gitteh nodegit https://github.com/tbranyen/nodegit Objective-C objective-git https://github.com/libgit2/objective-git OCaml libgit2-ocaml https://github.com/burdges/libgit2-ocaml Parrot Virtual Machine parrot-libgit2 https://github.com/letolabs/parrot-libgit2 Perl Git-Raw https://github.com/ghedo/p5-Git-Raw PHP php-git https://github.com/libgit2/php-git Python pygit2 https://github.com/libgit2/pygit2 Ruby Rugged https://github.com/libgit2/rugged Vala libgit2.vapi https://github.com/apmasell/vapis/blob/master/libgit2.vapi If you start another language binding to libgit2, please let us know so we can add it to the list. How Can I Contribute? ================================== Check the contribution guidelines. License ================================== libgit2 is under GPL2 with linking exemption. This means you can link to the library with any program, commercial, open source or other. However, you cannot modify libgit2 and distribute it without supplying the source. See the COPYING file for the full license text.

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