Place this in the following path relative to your git repo's root: .git/hooks/commit-msg

commit-msg

#!/usr/bin/env ruby
# Hook into the message and append the branch name so that we don't have to
# manually do it ourselves!

# This is the message that you put when you do:
# `git commit -m "This is my message"
message_file = ARGV[0]
message = File.read(message_file).strip

branch_name = `git rev-parse --abbrev-ref HEAD`.strip

# We don't want to do this if we're on master, that'd be weird!
if branch_name != "master" 
  # Checks if the branch name is already in the commit message
  unless message.include?branch_name
    prepend = "[#{branch_name}] "
    message = "#{prepend} #{message}"
  end
  puts message
  # Rewrite the commit message with the branch name in front.
  File.open(message_file, "w") { |f|
    f.write message
  }
end