rbenv-ruby-build/bin/ruby-build

#!/usr/bin/env bash

RUBY_BUILD_VERSION="20140214"

set -E
exec 3<&2 # preserve original stderr at fd 3


lib() {
  parse_options() {
    OPTIONS=()
    ARGUMENTS=()
    local arg option index

    for arg in "$@"; do
      if [ "${arg:0:1}" = "-" ]; then
        if [ "${arg:1:1}" = "-" ]; then
          OPTIONS[${#OPTIONS[*]}]="${arg:2}"
        else
          index=1
          while option="${arg:$index:1}"; do
            [ -n "$option" ] || break
            OPTIONS[${#OPTIONS[*]}]="$option"
            index=$(($index+1))
          done
        fi
      else
        ARGUMENTS[${#ARGUMENTS[*]}]="$arg"
      fi
    done
  }

  if [ "$1" == "--$FUNCNAME" ]; then
    declare -f "$FUNCNAME"
    echo "$FUNCNAME \"\$1\";"
    exit
  fi
}
lib "$1"


resolve_link() {
  $(type -p greadlink readlink | head -1) "$1"
}

abs_dirname() {
  local cwd="$(pwd)"
  local path="$1"

  while [ -n "$path" ]; do
    cd "${path%/*}"
    local name="${path##*/}"
    path="$(resolve_link "$name" || true)"
  done

  pwd
  cd "$cwd"
}

capitalize() {
  printf "%s" "$1" | tr a-z A-Z
}

sanitize() {
  printf "%s" "$1" | sed "s/[^A-Za-z0-9.-]/_/g; s/__*/_/g"
}

colorize() {
  if [ -t 1 ]; then printf "\e[%sm%s\e[m" "$1" "$2"
  else echo -n "$2"
  fi
}

build_failed() {
  { echo
    echo "BUILD FAILED"
    echo

    if ! rmdir "${BUILD_PATH}" 2>/dev/null; then
      echo "Inspect or clean up the working tree at ${BUILD_PATH}"

      if file_is_not_empty "$LOG_PATH"; then
        echo "Results logged to ${LOG_PATH}"
        echo
        echo "Last 10 log lines:"
        tail -n 10 "$LOG_PATH"
      fi
    fi
  } >&3
  exit 1
}

file_is_not_empty() {
  local filename="$1"
  local line_count="$(wc -l "$filename" 2>/dev/null || true)"

  if [ -n "$line_count" ]; then
    words=( $line_count )
    [ "${words[0]}" -gt 0 ]
  else
    return 1
  fi
}

num_cpu_cores() {
  local num=""
  if [ "Darwin" = "$(uname -s)" ]; then
    num="$(sysctl -n hw.ncpu 2>/dev/null || true)"
  elif [ -r /proc/cpuinfo ]; then
    num="$(grep ^processor /proc/cpuinfo | wc -l)"
    [ "$num" -gt 0 ] || num=""
  fi
  echo "${num:-2}"
}

install_package() {
  install_package_using "tarball" 1 "$@"
}

install_git() {
  install_package_using "git" 2 "$@"
}

install_svn() {
  install_package_using "svn" 2 "$@"
}

install_package_using() {
  local package_type="$1"
  local package_type_nargs="$2"
  local package_name="$3"
  shift 3

  local fetch_args=( "$package_name" "${@:1:$package_type_nargs}" )
  local make_args=( "$package_name" )
  local arg last_arg

  for arg in "${@:$(( $package_type_nargs + 1 ))}"; do
    if [ "$last_arg" = "--if" ]; then
      "$arg" || return 0
    elif [ "$arg" != "--if" ]; then
      make_args["${#make_args[@]}"]="$arg"
    fi
    last_arg="$arg"
  done

  pushd "$BUILD_PATH" >&4
  "fetch_${package_type}" "${fetch_args[@]}"
  make_package "${make_args[@]}"
  popd >&4

  { echo "Installed ${package_name} to ${PREFIX_PATH}"
    echo
  } >&2
}

make_package() {
  local package_name="$1"
  shift

  pushd "$package_name" >&4
  before_install_package "$package_name"
  build_package "$package_name" $*
  after_install_package "$package_name"
  fix_directory_permissions
  popd >&4
}

compute_md5() {
  if type md5 &>/dev/null; then
    md5 -q
  elif type openssl &>/dev/null; then
    local output="$(openssl md5)"
    echo "${output##* }"
  elif type md5sum &>/dev/null; then
    local output="$(md5sum -b)"
    echo "${output% *}"
  else
    return 1
  fi
}

verify_checksum() {
  # If there's no MD5 support, return success
  [ -n "$HAS_MD5_SUPPORT" ] || return 0

  # If the specified filename doesn't exist, return success
  local filename="$1"
  [ -e "$filename" ] || return 0

  # If there's no expected checksum, return success
  local expected_checksum=`echo "$2" | tr [A-Z] [a-z]`
  [ -n "$expected_checksum" ] || return 0

  # If the computed checksum is empty, return failure
  local computed_checksum=`echo "$(compute_md5 < "$filename")" | tr [A-Z] [a-z]`
  [ -n "$computed_checksum" ] || return 1

  if [ "$expected_checksum" != "$computed_checksum" ]; then
    { echo
      echo "checksum mismatch: ${filename} (file is corrupt)"
      echo "expected $expected_checksum, got $computed_checksum"
      echo
    } >&4
    return 1
  fi
}

http() {
  local method="$1"
  local url="$2"
  local file="$3"
  [ -n "$url" ] || return 1

  if type curl &>/dev/null; then
    "http_${method}_curl" "$url" "$file"
  elif type wget &>/dev/null; then
    "http_${method}_wget" "$url" "$file"
  else
    echo "error: please install \`curl\` or \`wget\` and try again" >&2
    exit 1
  fi
}

http_head_curl() {
  curl -qsILf "$1" >&4 2>&1
}

http_get_curl() {
  curl -C - -o "${2:--}" -qsSLf "$1"
}

http_head_wget() {
  wget -q --spider "$1" >&4 2>&1
}

http_get_wget() {
  wget -nv -c -O "${2:--}" "$1"
}

fetch_tarball() {
  local package_name="$1"
  local package_url="$2"
  local mirror_url
  local checksum

  if [ "$package_url" != "${package_url/\#}" ]; then
    checksum="${package_url#*#}"
    package_url="${package_url%%#*}"

    if [ -n "$RUBY_BUILD_MIRROR_URL" ]; then
      mirror_url="${RUBY_BUILD_MIRROR_URL}/$checksum"
    fi
  fi

  local tar_args="xzvf"
  local package_filename="${package_name}.tar.gz"

  if [ "$package_url" != "${package_url%bz2}" ]; then
    package_filename="${package_filename%.gz}.bz2"
    tar_args="${tar_args/z/j}"
  fi

  if ! symlink_tarball_from_cache "$package_filename" "$checksum"; then
    echo "Downloading ${package_filename}..." >&2
    http head "$mirror_url" &&
    download_tarball "$mirror_url" "$package_filename" "$checksum" ||
    download_tarball "$package_url" "$package_filename" "$checksum"
  fi

  { if tar $tar_args "$package_filename"; then
      if [ -z "$KEEP_BUILD_PATH" ]; then
        rm -f "$package_filename"
      else
        true
      fi
    fi
  } >&4 2>&1
}

symlink_tarball_from_cache() {
  [ -n "$RUBY_BUILD_CACHE_PATH" ] || return 1

  local package_filename="$1"
  local cached_package_filename="${RUBY_BUILD_CACHE_PATH}/$package_filename"
  local checksum="$2"

  [ -e "$cached_package_filename" ] || return 1
  verify_checksum "$cached_package_filename" "$checksum" >&4 2>&1 || return 1
  ln -s "$cached_package_filename" "$package_filename" >&4 2>&1 || return 1
}

download_tarball() {
  local package_url="$1"
  [ -n "$package_url" ] || return 1

  local package_filename="$2"
  local checksum="$3"

  echo "-> $package_url" >&2

  if http get "$package_url" "$package_filename" >&4 2>&1; then
    verify_checksum "$package_filename" "$checksum" >&4 2>&1 || return 1
  else
    echo "error: failed to download $package_filename" >&2
    return 1
  fi

  if [ -n "$RUBY_BUILD_CACHE_PATH" ]; then
    local cached_package_filename="${RUBY_BUILD_CACHE_PATH}/$package_filename"
    { mv "$package_filename" "$cached_package_filename"
      ln -s "$cached_package_filename" "$package_filename"
    } >&4 2>&1 || return 1
  fi
}

fetch_git() {
  local package_name="$1"
  local git_url="$2"
  local git_ref="$3"

  echo "Cloning ${git_url}..." >&2

  if type git &>/dev/null; then
    if [ -n "$RUBY_BUILD_CACHE_PATH" ]; then
      pushd "$RUBY_BUILD_CACHE_PATH" >&4
      local clone_name="$(sanitize "$git_url")"
      if [ -e "${clone_name}" ]; then
        { cd "${clone_name}"
          git fetch --force "$git_url" "+${git_ref}:${git_ref}"
        } >&4 2>&1
      else
        git clone --bare --branch "$git_ref" "$git_url" "${clone_name}" >&4 2>&1
      fi
      git_url="$RUBY_BUILD_CACHE_PATH/${clone_name}"
      popd >&4
    fi

    git clone --depth 1 --branch "$git_ref" "$git_url" "${package_name}" >&4 2>&1
  else
    echo "error: please install \`git\` and try again" >&2
    exit 1
  fi
}

fetch_svn() {
  local package_name="$1"
  local svn_url="$2"
  local svn_rev="$3"

  echo "Checking out ${svn_url}..." >&2

  if type svn &>/dev/null; then
    svn co -r "$svn_rev" "$svn_url" "${package_name}" >&4 2>&1
  else
    echo "error: please install \`svn\` and try again" >&2
    exit 1
  fi
}

build_package() {
  local package_name="$1"
  shift

  if [ "$#" -eq 0 ]; then
    local commands="standard"
  else
    local commands="$*"
  fi

  echo "Installing ${package_name}..." >&2

  [ -n "$HAS_PATCH" ] && apply_ruby_patch "$package_name"

  for command in $commands; do
    "build_package_${command}" "$package_name"
  done
}

package_option() {
  local package_name="$1"
  local command_name="$2"
  local variable="$(capitalize "${package_name}_${command_name}")_OPTS_ARRAY"
  local array="$variable[@]"
  shift 2
  local value=( "${!array}" "$@" )
  eval "$variable=( \"\${value[@]}\" )"
}

build_package_standard() {
  local package_name="$1"

  if [ "${MAKEOPTS+defined}" ]; then
    MAKE_OPTS="$MAKEOPTS"
  elif [ -z "${MAKE_OPTS+defined}" ]; then
    MAKE_OPTS="-j $(num_cpu_cores)"
  fi

  # Support YAML_CONFIGURE_OPTS, RUBY_CONFIGURE_OPTS, etc.
  local package_var_name="$(capitalize "${package_name%%-*}")"
  local PACKAGE_CONFIGURE="${package_var_name}_CONFIGURE"
  local PACKAGE_PREFIX_PATH="${package_var_name}_PREFIX_PATH"
  local PACKAGE_CONFIGURE_OPTS="${package_var_name}_CONFIGURE_OPTS"
  local PACKAGE_CONFIGURE_OPTS_ARRAY="${package_var_name}_CONFIGURE_OPTS_ARRAY[@]"
  local PACKAGE_MAKE_OPTS="${package_var_name}_MAKE_OPTS"
  local PACKAGE_MAKE_OPTS_ARRAY="${package_var_name}_MAKE_OPTS_ARRAY[@]"
  local PACKAGE_MAKE_INSTALL_OPTS="${package_var_name}_MAKE_INSTALL_OPTS"
  local PACKAGE_MAKE_INSTALL_OPTS_ARRAY="${package_var_name}_MAKE_INSTALL_OPTS_ARRAY[@]"
  local PACKAGE_CFLAGS="${package_var_name}_CFLAGS"

  [ "$package_var_name" = "RUBY" ] && use_homebrew_readline || true

  ( if [ "${CFLAGS+defined}" ] || [ "${!PACKAGE_CFLAGS+defined}" ]; then
      export CFLAGS="$CFLAGS ${!PACKAGE_CFLAGS}"
    fi
    ${!PACKAGE_CONFIGURE:-./configure} --prefix="${!PACKAGE_PREFIX_PATH:-$PREFIX_PATH}" $CONFIGURE_OPTS ${!PACKAGE_CONFIGURE_OPTS} "${!PACKAGE_CONFIGURE_OPTS_ARRAY}"
  ) >&4 2>&1

  { "$MAKE" $MAKE_OPTS ${!PACKAGE_MAKE_OPTS} "${!PACKAGE_MAKE_OPTS_ARRAY}"
    "$MAKE" install $MAKE_INSTALL_OPTS ${!PACKAGE_MAKE_INSTALL_OPTS} "${!PACKAGE_MAKE_INSTALL_OPTS_ARRAY}"
  } >&4 2>&1
}

build_package_autoconf() {
  { autoconf
  } >&4 2>&1
}

build_package_ruby() {
  local package_name="$1"

  { "$RUBY_BIN" setup.rb
  } >&4 2>&1
}

build_package_ree_installer() {
  build_package_auto_tcltk

  local options=""
  if [[ "Darwin" = "$(uname)" ]]; then
    options="--no-tcmalloc"
  fi

  local option
  for option in $RUBY_CONFIGURE_OPTS ${RUBY_CONFIGURE_OPTS_ARRAY[@]}; do
    options="$options -c $option"
  done

  # Work around install_useful_libraries crash with --dont-install-useful-gems
  mkdir -p "$PREFIX_PATH/lib/ruby/gems/1.8/gems"

  { ./installer --auto "$PREFIX_PATH" --dont-install-useful-gems $options $CONFIGURE_OPTS
  } >&4 2>&1
}

build_package_rbx() {
  local package_name="$1"

  { bundle --path=vendor/bundle
    RUBYOPT="-rubygems $RUBYOPT" ./configure --prefix="$PREFIX_PATH" $RUBY_CONFIGURE_OPTS
    rake install
    fix_rbx_gem_binstubs "$PREFIX_PATH"
    fix_rbx_irb "$PREFIX_PATH"
  } >&4 2>&1
}

build_package_mruby() {
  local package_name="$1"

  { rake
    mkdir -p "$PREFIX_PATH"
    cp -fR build/host/* "$PREFIX_PATH"
    cd "$PREFIX_PATH/bin"
    ln -fs mruby ruby
    ln -fs mirb irb
  } >&4 2>&1
}

build_package_maglev() {
  build_package_copy

  { cd "${PREFIX_PATH}"
    ./install.sh
    cd "${PREFIX_PATH}/bin"
    echo "Creating symlink for ruby*"
    ln -fs maglev-ruby ruby
    echo "Creating symlink for irb*"
    ln -fs maglev-irb irb
  } >&4 2>&1
  echo
  echo "Run 'maglev start' to start up the stone before using 'ruby' or 'irb'"
}

build_package_topaz() {
  build_package_copy
  { cd "${PREFIX_PATH}/bin"
    echo "Creating symlink for ruby*"
    ln -fs topaz ruby
  } >&4 2>&1
}

topaz_architecture() {
  case "$(uname -s)" in
  "Darwin") echo "osx64";;
  "Linux") [[ "$(uname -m)" = "x86_64" ]] && echo "linux64" || echo "linux32";;
  *)
    echo "no nightly builds available" >&2
    exit 1;;
  esac
}

build_package_jruby() {
  build_package_copy
  cd "${PREFIX_PATH}/bin"
  ln -fs jruby ruby
  chmod +x ruby
  install_jruby_launcher
  remove_windows_files
  fix_jruby_shebangs
}

install_jruby_launcher() {
  cd "${PREFIX_PATH}/bin"
  { ./ruby gem install jruby-launcher
  } >&4 2>&1
}

fix_jruby_shebangs() {
  for file in "${PREFIX_PATH}/bin"/*; do
    if [ "$(head -c 20 "$file")" = "#!/usr/bin/env jruby" ]; then
      sed -i.bak "1 s:.*:#\!${PREFIX_PATH}\/bin\/jruby:" "$file"
      rm "$file".bak
    fi
  done
}

remove_windows_files() {
  cd "$PREFIX_PATH"
  rm -f bin/*.exe bin/*.dll bin/*.bat bin/jruby.sh
}

build_package_copy() {
  mkdir -p "$PREFIX_PATH"
  cp -fR . "$PREFIX_PATH"
}

before_install_package() {
  local stub=1
}

after_install_package() {
  local stub=1
}

fix_directory_permissions() {
  # Ensure installed directories are not world-writable to avoid Bundler warnings
  find "$PREFIX_PATH" -type d \( -perm -020 -o -perm -002 \) -exec chmod go-w {} \;
}

fix_rbx_gem_binstubs() {
  local prefix="$1"
  local gemdir="${prefix}/gems/bin"
  local bindir="${prefix}/bin"
  local file binstub
  # Symlink Rubinius' `gems/bin/` into `bin/`
  if [ -d "$gemdir" ]; then
    for file in "$gemdir"/*; do
      binstub="${bindir}/${file##*/}"
      rm -f "$binstub"
      sed -E "s:^#\!.+:#\!${bindir}/ruby:" < "$file" > "$binstub"
      chmod +x "$binstub"
    done
    rm -rf "$gemdir"
    ln -s ../bin "$gemdir"
  fi
}

fix_rbx_irb() {
  local prefix="$1"
  "${prefix}/bin/irb" --version &>/dev/null ||
    "${prefix}/bin/gem" install rubysl-tracer -v '~> 2.0' --no-rdoc --no-ri &>/dev/null ||
    true
}

require_java7() {
  local version="$(java -version 2>/dev/null | head -1)"
  if [[ $version != *1.[789]* ]]; then
    colorize 1 "ERROR" >&3
    echo ": Java 7 required. Please install a 1.7-compatible JRE." >&3
    return 1
  fi
}

require_gcc() {
  local gcc="$(locate_gcc || true)"

  if [ -z "$gcc" ]; then
    { echo
      colorize 1 "ERROR"
      echo ": This package must be compiled with GCC, but ruby-build couldn't"
      echo "find a suitable \`gcc\` executable on your system. Please install GCC"
      echo "and try again."
      echo

      if [ "$(uname -s)" = "Darwin" ]; then
        colorize 1 "DETAILS"
        echo ": Apple no longer includes the official GCC compiler with Xcode"
        echo "as of version 4.2. Instead, the \`gcc\` executable is a symlink to"
        echo "\`llvm-gcc\`, a modified version of GCC which outputs LLVM bytecode."
        echo
        echo "For most programs the \`llvm-gcc\` compiler works fine. However,"
        echo "versions of Ruby older than 1.9.3-p125 are incompatible with"
        echo "\`llvm-gcc\`. To build older versions of Ruby you must have the official"
        echo "GCC compiler installed on your system."
        echo

        colorize 1 "TO FIX THE PROBLEM"
        if type brew &>/dev/null; then
          echo ": Install Homebrew's apple-gcc42 package with this"
          echo -n "command: "
          colorize 4 "brew tap homebrew/dupes ; brew install apple-gcc42"
        else
          echo ": Install the official GCC compiler using these"
          echo -n "packages: "
          colorize 4 "https://github.com/kennethreitz/osx-gcc-installer/downloads"
        fi

        echo
        echo
        echo "You will need to install the official GCC compiler to build older"
        echo "versions of Ruby even if you have installed Apple's Command Line Tools"
        echo "for Xcode package. The Command Line Tools for Xcode package only"
        echo "includes \`llvm-gcc\`."
      fi
    } >&3
    return 1
  fi

  export CC="$gcc"
}

locate_gcc() {
  local gcc gccs
  IFS=: gccs=($(gccs_in_path))

  verify_gcc "$CC" ||
  verify_gcc "$(command -v gcc || true)" || {
    for gcc in "${gccs[@]}"; do
      verify_gcc "$gcc" && break || true
    done
  }

  return 1
}

gccs_in_path() {
  local gcc path paths
  local gccs=()
  IFS=: paths=($PATH)

  shopt -s nullglob
  for path in "${paths[@]}"; do
    for gcc in "$path"/gcc-*; do
      gccs["${#gccs[@]}"]="$gcc"
    done
  done
  shopt -u nullglob

  printf :%s "${gccs[@]}"
}

verify_gcc() {
  local gcc="$1"
  if [ -z "$gcc" ]; then
    return 1
  fi

  local version="$("$gcc" --version || true)"
  if [ -z "$version" ]; then
    return 1
  fi

  if echo "$version" | grep LLVM >/dev/null; then
    return 1
  fi

  echo "$gcc"
}

needs_yaml() {
  [[ "$RUBY_CONFIGURE_OPTS" != *--with-libyaml-dir=* ]] &&
  ! use_homebrew_yaml
}

use_homebrew_yaml() {
  local libdir="$(brew --prefix libyaml 2>/dev/null || true)"
  if [ -d "$libdir" ]; then
    package_option ruby configure --with-libyaml-dir="$libdir"
  else
    return 1
  fi
}

use_homebrew_readline() {
  if [[ "$RUBY_CONFIGURE_OPTS" != *--with-readline-dir=* ]]; then
    local libdir="$(brew --prefix readline 2>/dev/null || true)"
    if [ -d "$libdir" ]; then
      package_option ruby configure --with-readline-dir="$libdir"
    else
      return 1
    fi
  fi
}

has_broken_mac_openssl() {
  [ "$(uname -s)" = "Darwin" ] &&
  [[ "$(openssl version 2>/dev/null || true)" = "OpenSSL 0.9.8"?* ]] &&
  [[ "$RUBY_CONFIGURE_OPTS" != *--with-openssl-dir=* ]] &&
  ! use_homebrew_openssl
}

use_homebrew_openssl() {
  local ssldir="$(brew --prefix openssl 2>/dev/null || true)"
  if [ -d "$ssldir" ]; then
    package_option ruby configure --with-openssl-dir="$ssldir"
  else
    return 1
  fi
}

build_package_mac_openssl() {
  # Install to a subdirectory since we don't want shims for bin/openssl.
  OPENSSL_PREFIX_PATH="${PREFIX_PATH}/openssl"

  # Put openssl.conf, certs, etc in ~/.rbenv/versions/*/openssl/ssl
  OPENSSLDIR="${OPENSSLDIR:-$OPENSSL_PREFIX_PATH/ssl}"

  # Tell Ruby to use this openssl for its extension.
  package_option ruby configure --with-openssl-dir="$OPENSSL_PREFIX_PATH"

  # Hint OpenSSL that we prefer a 64-bit build.
  export KERNEL_BITS="64"
  OPENSSL_CONFIGURE="${OPENSSL_CONFIGURE:-./config}"

  # Compile a shared lib with zlib dynamically linked, no kerberos.
  package_option openssl configure --openssldir="$OPENSSLDIR" zlib-dynamic no-krb5 shared

  # Default MAKE_OPTS are -j 2 which can confuse the build. Thankfully, make
  # gives precedence to the last -j option, so we can override that.
  package_option openssl make -j 1

  build_package_standard "$@"

  # Extract root certs from the system keychain in .pem format and rehash.
  local pem_file="$OPENSSLDIR/cert.pem"
  security find-certificate -a -p /Library/Keychains/System.keychain > "$pem_file"
  security find-certificate -a -p /System/Library/Keychains/SystemRootCertificates.keychain >> "$pem_file"
}

# Post-install check that the openssl extension was built.
build_package_verify_openssl() {
  "$RUBY_BIN" -e 'begin
    require "openssl"
  rescue LoadError
    abort "The Ruby openssl extension was not compiled. Missing the OpenSSL lib?"
  end' >&4 2>&1
}

# Ensure that directories listed in LDFLAGS exist
build_package_ldflags_dirs() {
  local arg
  for arg in $LDFLAGS; do
    case "$arg" in
    -L* ) mkdir -p "${arg#-L}" ;;
    esac
  done
}

build_package_auto_tcltk() {
  if [ "Darwin" = "$(uname -s)" ] && [ ! -d /usr/include/X11 ]; then
    if [ -d /opt/X11/include ]; then
      if [[ "$CPPFLAGS" != *-I/opt/X11/include* ]]; then
        export CPPFLAGS="-I/opt/X11/include $CPPFLAGS"
      fi
    else
      package_option ruby configure --without-tk
    fi
  fi
}

rake() {
  if [ -e "./Gemfile" ]; then
    bundle exec rake "$@"
  else
    isolated_gem_dependency "rake --version" rake -v '~> 10.1.0'
    command rake "$@"
  fi
}

bundle() {
  isolated_gem_dependency "bundle --version" bundler -v '~> 1.3.5'
  command bundle "$@"
}

isolated_gem_dependency() {
  set +E
  ( command $1 &>/dev/null ) || {
    set -E
    shift 1
    isolated_gem_install "$@"
  }
  set -E
}

isolated_gem_install() {
  export GEM_HOME="${PWD}/.gem"
  export PATH="${GEM_HOME}/bin:${PATH}"
  gem install "$@"
}

apply_ruby_patch() {
  case "$1" in
  ruby-* | jruby-* | rubinius-* )
    patch -p0 -i "${2:--}"
    ;;
  esac
}

version() {
  echo "ruby-build ${RUBY_BUILD_VERSION}"
}

usage() {
  { version
    echo "usage: ruby-build [-k|--keep] [-v|--verbose] [-p|--patch] definition prefix"
    echo "       ruby-build --definitions"
  } >&2

  if [ -z "$1" ]; then
    exit 1
  fi
}

list_definitions() {
  { for definition in "${RUBY_BUILD_ROOT}/share/ruby-build/"*; do
      echo "${definition##*/}"
    done
  } | sort
}



unset VERBOSE
unset KEEP_BUILD_PATH
unset HAS_PATCH
RUBY_BUILD_ROOT="$(abs_dirname "$0")/.."

parse_options "$@"

for option in "${OPTIONS[@]}"; do
  case "$option" in
  "h" | "help" )
    usage without_exiting
    { echo
      echo "  -k/--keep        Do not remove source tree after installation"
      echo "  -v/--verbose     Verbose mode: print compilation status to stdout"
      echo "  -p/--patch       Apply a patch from stdin before building"
      echo "  --definitions    List all built-in definitions"
      echo
    } >&2
    exit 0
    ;;
  "definitions" )
    list_definitions
    exit 0
    ;;
  "k" | "keep" )
    KEEP_BUILD_PATH=true
    ;;
  "v" | "verbose" )
    VERBOSE=true
    ;;
  "p" | "patch" )
    HAS_PATCH=true
    ;;
  "version" )
    version
    exit 0
    ;;
  esac
done

DEFINITION_PATH="${ARGUMENTS[0]}"
if [ -z "$DEFINITION_PATH" ]; then
  usage
elif [ ! -e "$DEFINITION_PATH" ]; then
  BUILTIN_DEFINITION_PATH="${RUBY_BUILD_ROOT}/share/ruby-build/${DEFINITION_PATH}"
  if [ -e "$BUILTIN_DEFINITION_PATH" ]; then
    DEFINITION_PATH="$BUILTIN_DEFINITION_PATH"
  else
    echo "ruby-build: definition not found: ${DEFINITION_PATH}" >&2
    exit 2
  fi
fi

PREFIX_PATH="${ARGUMENTS[1]}"
if [ -z "$PREFIX_PATH" ]; then
  usage
elif [ "${PREFIX_PATH#/}" = "$PREFIX_PATH" ]; then
  PREFIX_PATH="${PWD}/${PREFIX_PATH}"
fi

if [ -z "$TMPDIR" ]; then
  TMP="/tmp"
else
  TMP="${TMPDIR%/}"
fi

if [ ! -w "$TMP" ] || [ ! -x "$TMP" ]; then
  echo "ruby-build: TMPDIR=$TMP is set to a non-accessible location" >&2
  exit 1
fi

# Work around warnings building Ruby 2.0 on Clang 2.x:
# pass -Wno-error=shorten-64-to-32 if the compiler accepts it.
#
# When we set CFLAGS, Ruby won't apply its default flags, though. Since clang
# builds 1.9.x and 2.x only, where -O3 is default, we can safely set that flag.
# Ensure it's the first flag since later flags take precedence.
if "${CC:-cc}" -x c /dev/null -E -Wno-error=shorten-64-to-32 &>/dev/null; then
  RUBY_CFLAGS="-O3 -Wno-error=shorten-64-to-32 $RUBY_CFLAGS"
fi

if [ -z "$MAKE" ]; then
  if [[ "FreeBSD" = "$(uname -s)" ]]; then
    export MAKE="gmake"
  else
    export MAKE="make"
  fi
fi

if [ -n "$RUBY_BUILD_CACHE_PATH" ] && [ -d "$RUBY_BUILD_CACHE_PATH" ]; then
  RUBY_BUILD_CACHE_PATH="${RUBY_BUILD_CACHE_PATH%/}"
else
  unset RUBY_BUILD_CACHE_PATH
fi

if [ -z "$RUBY_BUILD_MIRROR_URL" ]; then
  RUBY_BUILD_MIRROR_URL="http://dqw8nmjcqpjn7.cloudfront.net"
else
  RUBY_BUILD_MIRROR_URL="${RUBY_BUILD_MIRROR_URL%/}"
fi

if [ -n "$RUBY_BUILD_SKIP_MIRROR" ]; then
  unset RUBY_BUILD_MIRROR_URL
fi

if echo test | compute_md5 >/dev/null; then
  HAS_MD5_SUPPORT=1
else
  unset HAS_MD5_SUPPORT
  unset RUBY_BUILD_MIRROR_URL
fi

SEED="$(date "+%Y%m%d%H%M%S").$$"
LOG_PATH="${TMP}/ruby-build.${SEED}.log"
RUBY_BIN="${PREFIX_PATH}/bin/ruby"
CWD="$(pwd)"

if [ -z "$RUBY_BUILD_BUILD_PATH" ]; then
  BUILD_PATH="${TMP}/ruby-build.${SEED}"
else
  BUILD_PATH="$RUBY_BUILD_BUILD_PATH"
fi

exec 4<> "$LOG_PATH" # open the log file at fd 4
if [ -n "$VERBOSE" ]; then
  tail -f "$LOG_PATH" &
  TAIL_PID=$!
  trap "kill $TAIL_PID" SIGINT SIGTERM EXIT
fi

export LDFLAGS="-L${PREFIX_PATH}/lib ${LDFLAGS}"
export CPPFLAGS="-I${PREFIX_PATH}/include ${CPPFLAGS}"

unset RUBYOPT
unset RUBYLIB

trap build_failed ERR
mkdir -p "$BUILD_PATH"
source "$DEFINITION_PATH"
[ -z "${KEEP_BUILD_PATH}" ] && rm -fr "$BUILD_PATH"
trap - ERR