configure.sh

#!/bin/bash

# Configuration script to symlink the dotfiles or clean up the symlinks.
# The script should take a target flag stating whether "build" or "clean". The
# first option will symlink all of the dotfiles and attempt to install
# oh-my-zsh. Otherwise, the script will simply remove all symlinks.

usage="Usage: $0 [-h] [-t <build|clean>]"

if [[ "$#" -lt 1 ]]; then
  echo "$usage"
  exit
fi

while getopts :ht: option; do
  case $option in
    h)
      echo "$usage"
      echo
      echo "OPTIONS"
      echo "-h            Output verbose usage message"
      echo "-t build      Set up dotfile symlinks and configure oh-my-zsh"
      echo "-t clean      Remove all existing dotfiles symlinks"
      exit;;
    t)
      if [[ "build" =~ ^${OPTARG} ]]; then
        BUILD=true
      elif [[ "clean" =~ ^${OPTARG} ]]; then
        BUILD=
      else
        echo "$usage" >&2
        exit 1
      fi;;
    \?)
      echo "Unknown option: -$OPTARG" >&2
      exit 1;;
    :)
      echo "Missing argument for -$OPTARG" >&2
      exit 1;;
  esac
done

declare -a FILES_TO_SYMLINK=(
  'editor/vim'
  'editor/vimrc'

  'git/gitattributes'
  'git/gitconfig'
  'git/gitignore'

  'shell/ignore'
  'shell/tmux.conf'
  'shell/zshrc'
  'shell/antigen.zsh'
  'shell/ripgreprc'

  'third_party/Gdbinit/gdbinit'
  'third_party/zsh-interactive-cd/zsh-interactive-cd.plugin.zsh'
)

declare -a FULL_PATH_FILES_TO_SYMLINK=(
  'config/nvim/init.vim'
)

print_success() {
  if [[ $BUILD ]]; then
    # Print output in green
    printf "\e[0;32m  [✔] %s\e[0m\n" "$1"
  else
    # Print output in cyan
    printf "\e[0;36m  [✔] Unlinked %s\e[0m\n" "$1"
  fi
}

print_error() {
  if [[ $BUILD ]]; then
    # Print output in red
    printf "\e[0;31m  [✖] %s %s\e[0m\n" "$1" "$2"
  else
    # Print output in red
    printf "\e[0;31m  [✖] Failed to unlink %s %s\e[0m\n" "$1" "$2"
  fi
}

print_question() {
  # Print output in yellow
  printf "\e[0;33m  [?] %s\e[0m" "$1"
}

execute() {
  $1 &> /dev/null
  print_result $? "${2:-$1}"
}

print_result() {
  if [ "$1" -eq 0 ]; then
    print_success "$2"
  else
    print_error "$2"
  fi

  [ "$3" == "true" ] && [ "$1" -ne 0 ] && exit
}

ask_for_confirmation() {
  print_question "$1 [y/N] "
  read -r -n 1
  printf "\n"
}

answer_is_yes() {
  [[ "$REPLY" =~ ^[Yy]$ ]] \
    && return 0 \
    || return 1
}

link_file() {
  local sourceFile=$1
  local targetFile=$2

  if [ ! -e "$targetFile" ]; then
    execute "ln -fs $sourceFile $targetFile" "$targetFile → $sourceFile"
  elif [ "$(readlink "$targetFile")" == "$sourceFile" ]; then
    print_success "$targetFile → $sourceFile"
  else
    ask_for_confirmation "'$targetFile' already exists, do you want to overwrite it?"
    if answer_is_yes; then
      rm -rf "$targetFile"
      execute "ln -fs $sourceFile $targetFile" "$targetFile → $sourceFile"
    else
      print_error "$targetFile → $sourceFile"
    fi
  fi
}

unlink_file() {
  local sourceFile=$1
  local targetFile=$2

  if [ "$(readlink "$targetFile")" == "$sourceFile" ]; then
    execute "unlink $targetFile" "$targetFile"
  fi
}

ensure_homebrew() {
  which -s brew
  if [[ $? != 0 ]] ; then
    # Install Homebrew
    /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
  else
    brew update
  fi
}

# Install basics using Brewfile
ensure_homebrew
brew bundle install

# Symlink (or unlink) the dotfiles.
for i in "${FILES_TO_SYMLINK[@]}"; do
  sourceFile="$(pwd)/$i"
  targetFile="$HOME/.$(printf "%s" "$i" | sed "s/.*\/\(.*\)/\1/g")"

  if [[ $BUILD ]]; then
    link_file $sourceFile $targetFile
  else
    unlink_file $sourceFile $targetFile
  fi
done

for i in "${FULL_PATH_FILES_TO_SYMLINK[@]}"; do
  sourceFile="$(pwd)/$i"
  targetFile="$HOME/.$i"

  if [[ $BUILD ]]; then
    mkdir -p $(dirname $targetFile)
    link_file $sourceFile $targetFile
  else
    unlink_file $sourceFile $targetFile
  fi
done

if [[ $BUILD ]]; then
  # Set up diff-so-fancy.
  if [[ "$(command -v diff-so-fancy)" ]]; then
    git config --global pager.diff "diff-so-fancy | less --tabs=4 -RFX"
    git config --global pager.show "diff-so-fancy | less --tabs=4 -RFX"

    git config --global color.ui true

    git config --global color.diff-highlight.oldNormal    "red"
    git config --global color.diff-highlight.oldHighlight "red 52"
    git config --global color.diff-highlight.newNormal    "green"
    git config --global color.diff-highlight.newHighlight "green 22"

    git config --global color.diff.meta       "yellow"
    git config --global color.diff.frag       "magenta"
    git config --global color.diff.commit     "yellow"
    git config --global color.diff.old        "red"
    git config --global color.diff.new        "green"
    git config --global color.diff.whitespace "red reverse"
  fi
fi