Introduction

xp is a tool created to make practising extreme programming easier.

Reference

Full list of options supported:

➜  ~ xp
NAME:
   xp - extreme programming made simple

USAGE:
   xp [global options] command [command options] [arguments...]

VERSION:
   (version)

COMMANDS:
     show-config, sc  Print the current config
     add-dev          Add a new developer
     init, i          Initialize a repo. Setup prepare-commit-msg hook
     set-devs         Set list of devs working on the repo
     help, h          Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --config value  set the default configuration file (default: "/Users/kidoman/.xp")
   --help, -h      show help
   --version, -v   print the versio

Features

Manage the co-authorship of commits by automatically writing appropriate* Co-authored-by trailers (see https://help.github.com/articles/creating-a-commit-with-multiple-authors/ for details on this standard)
Take co-authorship information written in the first line of the commit message and convert that into appropriate Co-authored-by trailers (overrides all other sources)
Ensure that the author drafting the commit is not duplicated as a Co-authored-by trailer
Preserve co-authorship information when ammending commits

Installation

The simplest way to install xp in your dev environment is:

go get -u github.com/gojek/xp

If you do not have go installed, or prefer to install a different way, you can always:

Download a binary from the releases page
brew install gojek/tap/xp

Usage

xp stores its global configuration at ~/.xp (can be overriden via global flag --config)

Most of the xp functionality are exposted via various subcommands:

show-config: Print the current stored configuration
add-dev: Add/remove developers in xp
init: Add/remove repos managed by xp

A separate command add-info is made available for use from within git hooks:

prepare-commit-msg
commit-msg

Example

Suppose we have a repo at ~/work/lambda which we want to now manage using xp (this assumes you have already installed xp using the instructions above):

Add Karan Misra <kidoman@gmail.com> as a tracked author in the system with shortcode "km" to allow for easy referencing in future command line invocations or the first line of commit messages. Same for "akshat":

$ xp add-dev km "Karan Misra" kidoman@beef.com
$ xp add-dev ak "akshat" akshat@beef.com

Switch to the directory with the git repo:

$ cd ~/work/lambda

Initialize the git hooks and register the repo with xp:

$ xp init

Indicate that akshat is pairing with you by adding him using his shortcode:

$ xp set-devs ak

Commit as normal:

$ touch CHANGE
$ git add .
$ git commit -m"Added CHANGE"

Rejoice at a well formed commit message:

$ git log -1
commit sha (HEAD -> master)
Author: Karan Misra <kidoman@beef.com>
Date:   date

    Added CHANGE

    Co-authored-by: akshat <akshat@beef.com>

When working on a story (issue, etc.), xp makes it really easy to embed the issue id in the commit in a well formed manner:

$ git add .
$ git commit -m"[BEEF-123|ak] This is a nice story"

$ git log -1
commit sha (HEAD -> master)
Author: Karan Misra <kidoman@beef.com>
Date:   date

    Make world better

    Issue-id: BEEF-123

    Co-authored-by: akshat <akshat@beef.com>

Bonus

If you quickly want to author a commit with someone you typically don't pair with:

$ xp add-dev anand "Anand Shankar" anand@beef.com

After making the required changes:

$ git add .
$ git commit -m"[anand] Make world better"

The commit message becomes:

$ git log -1
commit sha (HEAD -> master)
Author: Karan Misra <kidoman@beef.com>
Date:   date

    Make world better

    Co-authored-by: Anand Shankar <anand@beef.com>

Note: See how the [anand] from the start of the commit message has now resulted in Anand Shankar being added as a co-author, overriding the repo level setting (thus akshat is not in the list anymore.) Multiple co-authors can be similarly added by separating their aliases by , or | like so:

$ git commit -m"[anand,akshat] Make world better"
$ git commit -m"[anand|akshat] Make world better"