bootstrap

#!/usr/bin/env bash

# =============================================================================
# Script to setup our environment. Making sure tools are in place is handled
# by the individual configs themselves, not this script. For example,
# vimrc handles installing vim-plug, and brewstrap handles installing brew.
#
# Author: Nick Phair 
# Date: May 28, 2018 
# Version: v.2.0.0
# =============================================================================

# TODO: read configs in from file
# TODO: Platform work

BACKUP_DIR="${HOME}/rcs"
HISTORY_DIR="${HOME}/.history"
SCRATCHPAD_DIR="${HOME}/Scratchpad"
LOG="${HOME}/bootstrap.log"
VERBOSE=false

declare -a CONFIGS=(
  "bash_aliases" "bash_completion" "bashrc" "bash_profile" 
  "gitignore" "gitconfig"
  "ideavimrc"
  "inputrc"
  "pythonrc"
  "screenrc"
  "tmux.conf"
  "vim"
  "wgetrc"
)

# Build our needed directories.
build_dirs() {
  log "Building the required directories..."
  mkdir -p "${BACKUP_DIR}"
  mkdir -p "${HISTORY_DIR}"
  mkdir -p "${SCRATCHPAD_DIR}"
  mkdir -p "${HOME}/.bash_completion.d"
  mkdir -p "/opt"
}


# Helper function to log to stdout and optionally a file.
log() {
  if [ "${VERBOSE}" = true ]; then
    echo "$1" | tee "${LOG}"
  else
    echo "$1" >> "${LOG}"
  fi
}


# Symlink our dot files.
symlink() {
  log "Linking to the new dot files..."
  # The variable dot_file is the path of a file relative to the dot-files directory.
  for dot_file in **/*; do
    # Strip off the directory info so we can compare only the filename to our config list.
    dot_filename="${dot_file##*/}"
    for config in "${CONFIGS[@]}"; do
      if [ "${dot_filename}" = "${config}" ]; then
        ln -fs "${PWD}/${dot_file}" "${HOME}/.${config}"
        # TODO: ln -h apparently not available on ubuntu...
        #ln -fhs "${PWD}/${dot_file}" "${HOME}/.${config}"
        log "${HOME}/.${config} has been symlinked to ${PWD}/${dot_file}"
      fi
    done
  done
  # TODO: Link the message of the day. -- Can this be in home folder?
  #ln -s "${PWD}/misc-conf/motd" "/etc/motd"
}


# Back up any existing dot files.
backup() {
  log "Backing up current dot files..."
  for config in "${CONFIGS[@]}"; do
    dot_file="${HOME}/.${config}"
    # Be defensive, check for existence or use -L to check for dead symlinks.
    # TODO: handle, identical file case.
    if [ -e "${dot_file}" -o -L "${dot_file}" ]; then
      mv "${dot_file}" "${BACKUP_DIR}"
      log "The current version of ${dot_file} has been backed up to the ${BACKUP_DIR} directory."
    fi
  done
}


# Call the script to build brew, tap the caskroom, and fetch our packages.
build_brew() {
  ./"${PWD}/brew-conf/brewstrap"
}


# Execute the build tasks.
build_environment() {
   #build_brew
   build_dirs
   backup
   symlink
   # Launch a new shell with our configs.
   bash
}


# Display a useful help message.
usage() { 
  echo "usage: ${0} [-hv] [-b <backup directory>] [-g <history directory>]"
}


# Parse the args.
# -h is used for help, use the next letter g, for history.
while getopts ":b:hg:v" opt; do
  case ${opt} in
    b )
      BACKUP_DIR="${HOME}/${OPTARG}"
      ;;
    g )
      HISTORY_DIR="${HOME}/${OPTARG}"
      ;;
    h )
      usage
      exit 0
      ;;
    v )
      VERBOSE=true
      ;;
    \? )
      usage
      exit 1
      ;;
    : )
      usage
      exit 1
      ;;
  esac
done
shift $((OPTIND -1))

build_environment