install-scripts

#!/usr/bin/env bash
# Installs scripts from GitHub repository

# Environment setup
set -o pipefail

function print_usage() {
  cat <<EOF
Usage: $(basename "$0") [-h]

Installs scripts from GitHub repository to ${HOME}/bin/scripts and updates PATH.

Dependencies:
  git                Required to clone the repository

Optional arguments:
  -h, --help         Show this help message and exit
EOF
}

if [[ $# -gt 0 || "${1}" == "-h" || "${1}" == "--help" ]]; then
  print_usage
  exit 1
fi

echo
echo "Installing grantcarthew/scripts"
echo "License: Mozilla Public License Version 2.0"

echo "Checking Dependencies"
if ! command -v git >/dev/null; then
  echo "ERROR: Missing dependency - 'git'" >&2
  exit 1
fi

echo "Checking Target Directory"
readonly target_dir="${HOME}/bin/scripts"
if [[ -d "${target_dir}" ]]; then
  echo "Directory '${target_dir}' already exists, skipping creation"
else
  mkdir -p "${target_dir}" || { echo "ERROR: Failed to create '${target_dir}'" >&2; exit 1; }
fi

echo "Cloning Repository"
if [[ -d "${target_dir}/.git" ]]; then
  echo "Repository already cloned in '${target_dir}', skipping clone"
  echo "Pulling updates"
  cd "${target_dir}" || { echo "ERROR: Failed to change directory to '${target_dir}'" >&2; exit 1; }
  git pull || { echo "ERROR: Failed to update repository" >&2; exit 1; }
  cd - || { echo "ERROR: Failed to change directory back to original location" >&2; exit 1; }
else
  git clone git@github.com:grantcarthew/scripts.git "${target_dir}" || { echo "ERROR: Failed to clone repository" >&2; exit 1; }
  echo "Cloned repository to '${target_dir}'"
fi

echo "Updating PATH in .bashrc"
bashrc_file="${HOME}/.bashrc"
#shellcheck disable=SC2016
path_entry='export PATH="${PATH}:${HOME}/bin/scripts"'
if grep -Fx "${path_entry}" "${bashrc_file}" >/dev/null; then
  echo "PATH entry already exists in '${bashrc_file}'"
else
  echo "${path_entry}" >> "${bashrc_file}" || { echo "ERROR: Failed to update '${bashrc_file}'" >&2; exit 1; }
  echo "Added PATH entry to '${bashrc_file}'"
fi

echo "Installation complete."
echo "Either run 'source ${bashrc_file}' to update your current session"
echo "or restart your terminal."