git-setup

#!/bin/bash
#
# Set up a git repository if one doesn't exist, add all files and make an initial commit.
#
# - Set up a git repository in the current working directory:
#
# `git-setup`
#
# - Set up a git repository in a custom directory:
#
# `git-setup {{path/to/repository}}`
#
# - Set up a git repository in the current working directory with a custom commit message:
#
# `git-setup -m {{commit_message}}`
#
# - Set up a git repository in the custom directory with a custom commit message:
#
# `git-setup -m {{commit_message}} {{path/to/repository}}`
#
# ---
# Based on https://github.com/tj/git-extras/blob/master/bin/git-setup
#
# Author: Nick Plekhanov, https://nikkhan.com/
# License: MIT
# https://github.com/nicksp/dotfiles

COMMIT_MESSAGE='Initial commit'

if [ "$1" == "-m" ]; then
  COMMIT_MESSAGE=$2
  shift
  shift
fi

gitdirexists() {
  if [ -d ".git" ]; then
    echo ".git directory already exists, aborting"
    exit 1
  fi
}

dir=$(test -z "$*" && echo "." || echo "$*")
mkdir -p "$dir" \
  && cd "$dir" \
  && gitdirexists \
  && git init \
  && git add . \
  && git commit --allow-empty -m "$COMMIT_MESSAGE"