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# Making a patch

You’ve discovered a bug or something else you want to change in ipython - excellent!

You’ve worked out a way to fix it - even better!

You want to tell us about it - best of all!

The easiest way is to make a patch or set of patches. Here we explain how. Making a patch is the simplest and quickest, but if you’re going to be doing anything more than simple quick things, please consider following the Git for development model instead.

## Making patches

### Overview

    # tell git who you are
    git config --global user.email you@yourdomain.example.com
    git config --global user.name "Your Name Comes Here"
    # get the repository if you don't have it
    git clone git://github.com/ipython/ipython.git
    # make a branch for your patching
    cd ipython
    git branch the-fix-im-thinking-of
    git checkout the-fix-im-thinking-of
    # hack, hack, hack
    # Tell git about any new files you've made
    git add somewhere/tests/test_my_bug.py
    # commit work in progress as you go
    git commit -am 'BF - added tests for Funny bug'
    # hack hack, hack
    git commit -am 'BF - added fix for Funny bug'
    # make the patch files
    git format-patch -M -C master

Then, send the generated patch files to the ipython mailing list - where we will thank you warmly.

### In detail

1. Tell git who you are so it can label the commits you’ve made:

       git config --global user.email you@yourdomain.example.com
       git config --global user.name "Your Name Comes Here"

2. If you don’t already have one, clone a copy of the ipython repository:

       git clone git://github.com/ipython/ipython.git
       cd ipython

3. Make a ‘feature branch’. This will be where you work on your bug fix. It’s nice and safe and leaves you with access to an unmodified copy of the code in the main branch:

       git branch the-fix-im-thinking-of
       git checkout the-fix-im-thinking-of

4. Do some edits, and commit them as you go:

       # hack, hack, hack
       # Tell git about any new files you've made
       git add somewhere/tests/test_my_bug.py
       # commit work in progress as you go
       git commit -am 'BF - added tests for Funny bug'
       # hack hack, hack
       git commit -am 'BF - added fix for Funny bug'

   Note the `-am` options to `commit`. The `m` flag just signals that you’re going to type a message on the command line. The `a` flag - you can just take on faith - or see why the -a flag?.

5. When you have finished, check you have committed all your changes:

       git status

6. Finally, make your commits into patches. You want all the commits since you branched from the `master` branch:

       git format-patch -M -C master

   You will now have several files named for the commits:

       0001-BF-added-tests-for-Funny-bug.patch
       0002-BF-added-fix-for-Funny-bug.patch

   Send these files to the ipython mailing list.

When you are done, to switch back to the main copy of the code, just return to the `master` branch:

    git checkout master

## Moving from patching to development

If you find you have done some patches, and you have one or more feature branches, you will probably want to switch to development mode. You can do this with the repository you have.

Fork the ipython repository on github - Making your own copy (fork) of ipython. Then:

    # checkout and refresh master branch from main repo
    git checkout master
    git pull origin master
    # rename pointer to main repository to 'upstream'
    git remote rename origin upstream
    # point your repo to default read / write to your fork on github
    git remote add origin git@github.com:your-user-name/ipython.git
    # push up any branches you've made and want to keep
    git push origin the-fix-im-thinking-of

Then you can, if you want, follow the Development workflow.

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