See https://github.com/juliamae/githooks

prepare-commit-msg

#!/usr/bin/env ruby
#
# This hook can be found in https://github.com/juliamae/githooks

commit_msg_file = ARGV[0]
branch_name     = `git branch | grep '*'`.gsub(/[* |\n]/,"")

if message = open(commit_msg_file).read
  open(commit_msg_file, 'w') do |f|
    f.puts message.gsub("Merge", ":part_alternation_mark:erge")
      .gsub(" remote-tracking branch", "")
      .gsub(branch_name, "this fine-ass branch right here")
  end
end

that'll look great on the console :(

¯_(ツ)_/¯