bin/brew-cask

   1 #!/bin/bash
   2 #
   3 # brew-cask
   4 #
   5 # bash shim to invoke brew-cask-cmd.rb
   6 #
   7
   8 ###
   9 ### settings
  10 ###
  11
  12 set -e
  13 set -o pipefail
  14 set +o histexpand
  15 set -o nounset
  16 shopt -s nocasematch
  17 shopt -s nullglob
  18 shopt -s dotglob
  19
  20 ###
  21 ### functions
  22 ###
  23
  24 warn () {
  25     local message="$@"
  26     message="${message//\\t/$'\011'}"
  27     message="${message//\\n/$'\012'}"
  28     message="${message%"${message##*[![:space:]]}"}"
  29     printf "%s\n" "$message" 1>&2
  30 }
  31
  32 die () {
  33     warn "$@"
  34     exit 1
  35 }
  36
  37 resolve_dir () {
  38     local resolved="$(for dir; do cd "$dir"; done && /bin/pwd -P)"
  39     if [[ -d "$resolved" ]]; then
  40         printf "%s" "$resolved"
  41     else
  42         die "cannot resolve: '$@'"
  43     fi
  44 }
  45
  46 ensure_dir () {
  47     local dir="$1"
  48     local message
  49     shift
  50
  51     if [ "$#" -gt 0 ]; then
  52         message="$@"
  53     else
  54         message="brew-cask: no such directory: '$dir'"
  55     fi
  56     if ! [[ -d "$dir" ]]; then
  57         die "$message"
  58     fi
  59 }
  60
  61 ensure_file () {
  62     local file="$1"
  63     local message
  64     shift
  65
  66     if [ "$#" -gt 0 ]; then
  67         message="$@"
  68     else
  69         message="brew-cask: no such file: '$file'"
  70     fi
  71     if ! [[ -f "$file" ]]; then
  72         die "$message"
  73     fi
  74 }
  75
  76 ensure_executable () {
  77     local executable="$1"
  78     local message
  79     shift
  80
  81     if [ "$#" -gt 0 ]; then
  82         message="$@"
  83     else
  84         message="brew-cask: no such executable: '$executable'"
  85     fi
  86     if ! [[ -f "$executable" ]] || ! [[ -x "$executable" ]]; then
  87         die "$message"
  88     fi
  89 }
  90
  91 find_ruby_2_plus () {
  92     declare -a rubies
  93     local favorite_ruby="/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby"
  94     local version_str
  95
  96     if [[ -x "$favorite_ruby" ]]; then
  97         printf "%s" "$favorite_ruby"
  98     else
  99         IFS=$'\n' rubies=( $(/usr/bin/type -aP ruby)   \
 100                            "/usr/local/bin/ruby"       \
 101                            "$(brew --prefix 2>/dev/null)/bin/ruby" )
 102         for ruby in "${rubies[@]}"; do
 103             version_str="$("$ruby" --version 2>/dev/null)"
 104             if [[ "$version_str" =~ ^ruby.2 ]]; then
 105                 printf "%s" "$ruby"
 106                 break
 107             fi
 108         done
 109     fi
 110 }
 111
 112 ###
 113 ### main
 114 ###
 115
 116 _brew_cask () {
 117     local script_dir
 118     local symlink_target
 119     local symlink_target_dir
 120     local brewcask_lib_dir
 121     local brewcask_command
 122     local interpreter
 123     declare -a ruby_opts
 124
 125     ruby_opts=( "-W0" "-EUTF-8:UTF-8" )
 126
 127     script_dir="$(resolve_dir "${0%/*}")"
 128     ensure_dir "$script_dir" \
 129                "brew-cask: could not resolve script directory"
 130
 131     # return "." in case we are not a link
 132     symlink_target="$(/usr/bin/readlink "$0" || echo ".")"
 133
 134     # redefine script_dir because we are likely to be a relative link
 135     symlink_target_dir="$(/usr/bin/dirname "$symlink_target")"
 136     script_dir="$(resolve_dir "$script_dir" "$symlink_target_dir")"
 137     ensure_dir "$script_dir" \
 138                "brew-cask: could not resolve script directory"
 139
 140     # The Homebrew install process replaces the lib element below with rubylib
 141     brewcask_lib_dir="$(resolve_dir "$script_dir"/../lib)"
 142     ensure_dir "$brewcask_lib_dir" \
 143                "brew-cask: could not resolve homebrew-cask library directory"
 144
 145     brewcask_command="$brewcask_lib_dir/brew-cask-cmd.rb"
 146     ensure_file "$brewcask_command" \
 147                 "brew-cask: could not find brew-cask-cmd.rb in '$brewcask_lib_dir'"
 148
 149     interpreter="$(find_ruby_2_plus)"
 150     ensure_executable "$interpreter" \
 151                       "brew-cask: could not find Ruby 2.0 or greater.  Try 'brew install ruby'."
 152
 153     exec "$interpreter" "${ruby_opts[@]}" "$brewcask_command" "${@}"
 154 }
 155
 156 ###
 157 ### initialization
 158 ###
 159
 160 unset GEM_HOME
 161 unset GEM_PATH
 162
 163 ###
 164 ### dispatch
 165 ###
 166
 167 _brew_cask "${@:-}"
 168
 169 #