#!/usr/bin/env bash
#
# Usage: ruby-build [-kpv] <definition> <prefix>
#        ruby-build --definitions
#        ruby-build --version
#
#   -k/--keep        Do not remove source tree after installation
#   -p/--patch       Apply a patch from stdin before building
#   -v/--verbose     Verbose mode: print compilation status to stdout
#   -4/--ipv4        Resolve names to IPv4 addresses only
#   -6/--ipv6        Resolve names to IPv6 addresses only
#   --definitions    List all built-in definitions
#   --version        Show version of ruby-build
#

RUBY_BUILD_VERSION="20170523"

OLDIFS="$IFS"

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
}

os_information() {
  if type -p lsb_release >/dev/null; then
    lsb_release -sir | xargs echo
  elif type -p sw_vers >/dev/null; then
    echo "OS X $(sw_vers -productVersion)"
  elif [ -r /etc/os-release ]; then
    source /etc/os-release
    echo "$NAME" $VERSION_ID
  else
    local os="$(cat /etc/{centos,redhat,fedora,system}-release /etc/debian_version 2>/dev/null | head -1)"
    echo "${os:-$(uname -sr)}"
  fi
}

is_mac() {
  [ "$(uname -s)" = "Darwin" ] || return 1
  [ $# -eq 0 ] || [ "$(osx_version)" "$@" ]
}

#  9.1  -> 901
# 10.9  -> 1009
# 10.10 -> 1010
osx_version() {
  local -a ver
  IFS=. ver=( `sw_vers -productVersion` )
  IFS="$OLDIFS"
  echo $(( ${ver[0]}*100 + ${ver[1]} ))
}

build_failed() {
  { echo
    colorize 1 "BUILD FAILED"
    echo " ($(os_information) using $(version))"
    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
        colorize 33 "Results logged to ${LOG_PATH}"
        printf "\n\n"
        echo "Last 10 log lines:"
        tail -n 10 "$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
  case "$(uname -s)" in
  Darwin | *BSD )
    num="$(sysctl -n hw.ncpu 2>/dev/null || true)"
    ;;
  * )
    num="$(grep ^processor /proc/cpuinfo 2>/dev/null | wc -l | xargs)"
    num="${num#0}"
    ;;
  esac
  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_sha2() {
  local output
  if type shasum &>/dev/null; then
    output="$(shasum -a 256 -b)" || return 1
    echo "${output% *}"
  elif type openssl &>/dev/null; then
    local openssl="$(command -v "$(brew --prefix openssl 2>/dev/null || true)"/bin/openssl openssl | head -1)"
    output="$("$openssl" dgst -sha256 2>/dev/null)" || return 1
    echo "${output##* }"
  elif type sha256sum &>/dev/null; then
    output="$(sha256sum --quiet)" || return 1
    echo "${output% *}"
  else
    return 1
  fi
}

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

has_checksum_support() {
  local checksum_command="$1"
  local has_checksum_var="HAS_CHECKSUM_SUPPORT_${checksum_command}"

  if [ -z "${!has_checksum_var+defined}" ]; then
    printf -v "$has_checksum_var" "$(echo test | "$checksum_command" >/dev/null; echo $?)"
  fi
  return "${!has_checksum_var}"
}

verify_checksum() {
  local checksum_command
  local filename="$1"
  local expected_checksum="$(echo "$2" | tr [A-Z] [a-z])"

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

  case "${#expected_checksum}" in
  0) return 0 ;; # empty checksum; return success
  32) checksum_command="compute_md5" ;;
  64) checksum_command="compute_sha2" ;;
  *)
    { echo
      echo "unexpected checksum length: ${#expected_checksum} (${expected_checksum})"
      echo "expected 0 (no checksum), 32 (MD5), or 64 (SHA2-256)"
      echo
    } >&4
    return 1 ;;
  esac

  # If chosen provided checksum algorithm isn't supported, return success
  has_checksum_support "$checksum_command" || return 0

  # If the computed checksum is empty, return failure
  local computed_checksum=`echo "$($checksum_command < "$filename")" | tr [A-Z] [a-z]`
  [ -n "$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 aria2c &>/dev/null; then
    "http_${method}_aria2c" "$url" "$file"
  elif type curl &>/dev/null; then
    "http_${method}_curl" "$url" "$file"
  elif type wget &>/dev/null; then
    "http_${method}_wget" "$url" "$file"
  else
    echo "error: please install \`aria2c\`, \`curl\` or \`wget\` and try again" >&2
    exit 1
  fi
}

http_head_aria2c() {
  aria2c --dry-run --no-conf=true ${ARIA2_OPTS} "$1" >&4 2>&1
}

http_get_aria2c() {
  local out="${2:-$(mktemp "out.XXXXXX")}"
  if aria2c --allow-overwrite=true --no-conf=true -o "${out}" ${ARIA2_OPTS} "$1" >&4; then
    [ -n "$2" ] || cat "${out}"
  else
    false
  fi
}

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

http_get_curl() {
  curl -q -o "${2:--}" -sSLf ${CURL_OPTS} "$1"
}

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

http_get_wget() {
  wget -nv ${WGET_OPTS} -O "${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 "$RUBY_BUILD_MIRROR_URL" ]; then
      if [[ -z "$RUBY_BUILD_DEFAULT_MIRROR" || $package_url != */cache.ruby-lang.org/* ]]; then
        mirror_url="${RUBY_BUILD_MIRROR_URL}/$checksum"
      fi
    fi
  fi

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

  if [ "$package_url" != "${package_url%bz2}" ]; then
    if ! type -p bzip2 >/dev/null; then
      echo "warning: bzip2 not found; consider installing \`bzip2\` package" >&4
    fi
    package_filename="${package_filename%.gz}.bz2"
    tar_args="${tar_args/z/j}"
  fi

  if ! reuse_existing_tarball "$package_filename" "$checksum"; then
    local tarball_filename=$(basename $package_url)
    echo "Downloading ${tarball_filename}..." >&2
    http head "$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
}

reuse_existing_tarball() {
  local package_filename="$1"
  local checksum="$2"

  # Reuse existing file in build location
  if [ -e "$package_filename" ] && verify_checksum "$package_filename" "$checksum"; then
    return 0
  fi

  # Reuse previously downloaded file in cache location
  [ -n "$RUBY_BUILD_CACHE_PATH" ] || return 1
  local cached_package_filename="${RUBY_BUILD_CACHE_PATH}/$package_filename"

  [ -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

    if [ -e "${package_name}" ]; then
      ( cd "${package_name}"
        git fetch --depth 1 origin "+${git_ref}"
        git checkout -q -B "$git_ref" "origin/${git_ref}"
      ) >&4 2>&1
    else
      git clone --depth 1 --branch "$git_ref" "$git_url" "${package_name}" >&4 2>&1
    fi
  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" "${package_name}" >&4 2>&1
  elif type svnlite &>/dev/null; then
    svnlite co -r "$svn_rev" "$svn_url" "${package_name}" >&4 2>&1
  else
    echo "error: please install Subversion 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_warn_eol() {
  local package_name="$1"

  { echo
    echo "WARNING: $package_name is past its end of life and is now unsupported."
    echo "It no longer receives bug fixes or critical security updates."
    echo
  } >&3
}

build_package_warn_unsupported() {
  local package_name="$1"

  { echo
    echo "WARNING: $package_name is nearing its end of life."
    echo "It only receives critical security updates, no bug fixes."
    echo
  } >&3
}

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"

  if [ "$package_var_name" = "RUBY" ]; then
      use_homebrew_readline || use_freebsd_pkg ||true
  fi

  ( if [ "${CFLAGS+defined}" ] || [ "${!PACKAGE_CFLAGS+defined}" ]; then
      export CFLAGS="$CFLAGS ${!PACKAGE_CFLAGS}"
    fi
    if [ -z "$CC" ] && is_mac -ge 1010; then
      export CC=clang
    fi
    ${!PACKAGE_CONFIGURE:-./configure} --prefix="${!PACKAGE_PREFIX_PATH:-$PREFIX_PATH}" \
      $CONFIGURE_OPTS ${!PACKAGE_CONFIGURE_OPTS} "${!PACKAGE_CONFIGURE_OPTS_ARRAY}" || return 1
  ) >&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=""
  is_mac && options="--no-tcmalloc"

  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"

  { [ ! -e "Gemfile" ] || bundle --path=vendor/bundle
    if [ -n "$RUBY_BUILD_CACHE_PATH" ]; then
      mkdir -p vendor
      ln -s "$RUBY_BUILD_CACHE_PATH" vendor/prebuilt
    fi

    local opt
    local -a configure_opts
    for opt in "${RUBY_CONFIGURE_OPTS_ARRAY[@]}"; do
      if [[ $opt == --with-openssl-dir=* ]]; then
        local openssl_dir="${opt#*=}"
        configure_opts[${#configure_opts[@]}]="--with-lib-dir=${openssl_dir}/lib"
        configure_opts[${#configure_opts[@]}]="--with-include-dir=${openssl_dir}/include"
      else
        configure_opts[${#configure_opts[@]}]="$opt"
      fi
    done

    RUBYOPT="-rubygems $RUBYOPT" ./configure --prefix="$PREFIX_PATH" $RUBY_CONFIGURE_OPTS "${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" ] && [ ! -L "$gemdir" ]; then
    for file in "$gemdir"/*; do
      binstub="${bindir}/${file##*/}"
      rm -f "$binstub"
      { echo "#!${bindir}/ruby"
        grep -v '^#!' "$file"
      } > "$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>&1 | grep '\(java\|openjdk\) version' | 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 is_mac; 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"
  if is_mac -ge 1010; then
    export MACOSX_DEPLOYMENT_TARGET=10.9
  fi
}

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

  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=($PATH)
  IFS="$OLDIFS"

  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 2>/dev/null || true)"
  if [ -z "$version" ]; then
    return 1
  fi

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

  echo "$gcc"
}

require_llvm() {
  local llvm_version="$1"
  if is_mac -ge 1010; then
    if [[ "$RUBY_CONFIGURE_OPTS" != *--llvm-* ]]; then
      case "$llvm_version" in
      3.2 )
        package_option ruby configure --prebuilt-name="llvm-3.2-x86_64-apple-darwin13.tar.bz2"
        ;;
      3.[56] )
        local llvm_config="$(locate_llvm "$llvm_version")"
        if [ -n "$llvm_config" ]; then
          package_option ruby configure --llvm-config="$llvm_config"
        else
          local homebrew_package="llvm@$llvm_version"
          { echo
            colorize 1 "ERROR"
            echo ": Rubinius will not be able to compile using Apple's LLVM-based "
            echo "build tools on OS X. You will need to install LLVM $llvm_version first."
            echo
            colorize 1 "TO FIX THE PROBLEM"
            echo ": Install Homebrew's llvm package with this"
            echo -n "command: "
            colorize 4 "brew install $homebrew_package"
            echo
          } >&3
          return 1
        fi
        ;;
      esac
    fi
  fi
}

locate_llvm() {
  local llvm_version="$1"
  local package llvm_config
  shopt -s nullglob
  for package in `brew list 2>/dev/null | grep "^llvm"`; do
    llvm_config="$(echo "$(brew --prefix "$package")/bin/llvm-config"*)"
    if [ -n "$llvm_config" ] && [[ "$("$llvm_config" --version)" = "$llvm_version"* ]]; then
      echo "$llvm_config"
      break
    fi
  done
  shopt -u nullglob
}

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
    echo "ruby-build: use libyaml from homebrew"
    package_option ruby configure --with-libyaml-dir="$libdir"
  else
    return 1
  fi
}

use_freebsd_pkg() {
  # check if FreeBSD
  if [ "FreeBSD" = "$(uname -s)" ]; then
    # use openssl if installed from Ports Collection
    if [ -f /usr/local/include/openssl/ssl.h ]; then
      package_option ruby configure --with-openssl-dir="/usr/local"
    fi

    # check if 11-R or later
    release="$(uname -r)"
    if [ "${release%%.*}" -ge 11 ]; then
      # prefers readline to compile most of ruby versions
      if pkg info -e readline > /dev/null; then
        # use readline from Ports Collection
        package_option ruby configure --with-readline-dir="/usr/local"
      elif pkg info -e libedit > /dev/null; then
        # use libedit from Ports Collection
        package_option ruby configure --enable-libedit
        package_option ruby configure --with-libedit-dir="/usr/local"
      fi
    fi
  fi
}

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

has_broken_mac_openssl() {
  is_mac &&
  [[ "$(/usr/bin/openssl version 2>/dev/null || true)" = "OpenSSL 0.9.8"?* ]] &&
  [[ "$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
    echo "ruby-build: use openssl from homebrew"
    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}"

  local nokerberos
  [[ "$1" != openssl-1.0.* ]] || nokerberos=1

  # Compile a shared lib with zlib dynamically linked.
  package_option openssl configure --openssldir="$OPENSSLDIR" zlib-dynamic no-ssl3 shared ${nokerberos:+no-ssl2 no-krb5}

  # 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 '
    manager = ARGV[0]
    packages = {
      "apt-get" => Hash.new {|h,k| "lib#{k}-dev" }.update(
        "openssl" => "libssl-dev",
        "zlib" => "zlib1g-dev"
      ),
      "yum" => Hash.new {|h,k| "#{k}-devel" }.update(
        "yaml" => "libyaml-devel"
      )
    }

    failed = %w[openssl readline zlib yaml].reject do |lib|
      begin
        require lib
      rescue LoadError
        $stderr.puts "The Ruby #{lib} extension was not compiled."
      end
    end

    if failed.size > 0
      $stderr.puts "ERROR: Ruby install aborted due to missing extensions"
      $stderr.print "Try running `%s install -y %s` to fetch missing dependencies.\n\n" % [
        manager,
        failed.map { |lib| packages.fetch(manager)[lib] }.join(" ")
      ] unless manager.empty?
      $stderr.puts "Configure options used:"
      require "rbconfig"; require "shellwords"
      RbConfig::CONFIG.fetch("configure_args").shellsplit.each { |arg| $stderr.puts "  #{arg}" }
      exit 1
    end
  ' "$(basename "$(type -p yum apt-get | head -1)")" >&4 2>&1
}

# Ensure that directories listed in LDFLAGS exist
build_package_ldflags_dirs() {
  local arg dir
  set - $LDFLAGS
  while [ $# -gt 0 ]; do
    dir=""
    case "$1" in
    -L  ) dir="$2" ;;
    -L* ) dir="${1#-L}" ;;
    esac
    [ -z "$dir" ] || mkdir -p "$dir"
    shift 1
  done
}

build_package_enable_shared() {
    package_option ruby configure --enable-shared
}

build_package_auto_tcltk() {
  if is_mac && [ ! -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() {
  local patchfile
  case "$1" in
  ruby-* | jruby-* | rubinius-* )
    patchfile="$(mktemp "${TMP}/ruby-patch.XXXXXX")"
    cat "${2:--}" >"$patchfile"

    local striplevel=0
    grep -q '^diff --git a/' "$patchfile" && striplevel=1
    patch -p$striplevel --force -i "$patchfile"
    ;;
  esac
}

version() {
  local git_revision
  # Read the revision from git if the remote points to "ruby-build" repository
  if GIT_DIR="$RUBY_BUILD_INSTALL_PREFIX/.git" git remote -v 2>/dev/null | grep -q /ruby-build; then
    git_revision="$(GIT_DIR="$RUBY_BUILD_INSTALL_PREFIX/.git" git describe --tags HEAD 2>/dev/null || true)"
    git_revision="${git_revision#v}"
  fi
  echo "ruby-build ${git_revision:-$RUBY_BUILD_VERSION}"
}

usage() {
  sed -ne '/^#/!q;s/.\{1,2\}//;1,2d;p' < "$0"
  [ -z "$1" ] || exit "$1"
}

list_definitions() {
  { for DEFINITION_DIR in "${RUBY_BUILD_DEFINITIONS[@]}"; do
      [ -d "$DEFINITION_DIR" ] && ls "$DEFINITION_DIR"
    done
  } | sort_versions | uniq
}

sort_versions() {
  sed 'h; s/[+-]/./g; s/.p\([[:digit:]]\)/.z.\1/; s/$/.z/; G; s/\n/ /' | \
    LC_ALL=C sort -t. -k 1,1 -k 2,2n -k 3,3n -k 4,4n -k 5,5n | awk '{print $2}'
}


unset VERBOSE
unset KEEP_BUILD_PATH
unset HAS_PATCH
unset IPV4
unset IPV6

RUBY_BUILD_INSTALL_PREFIX="$(abs_dirname "$0")/.."

IFS=: RUBY_BUILD_DEFINITIONS=($RUBY_BUILD_DEFINITIONS ${RUBY_BUILD_ROOT:-$RUBY_BUILD_INSTALL_PREFIX}/share/ruby-build)
IFS="$OLDIFS"

parse_options "$@"

for option in "${OPTIONS[@]}"; do
  case "$option" in
  "h" | "help" )
    version
    echo
    usage 0
    ;;
  "definitions" )
    list_definitions
    exit 0
    ;;
  "k" | "keep" )
    KEEP_BUILD_PATH=true
    ;;
  "v" | "verbose" )
    VERBOSE=true
    ;;
  "p" | "patch" )
    HAS_PATCH=true
    ;;
  "4" | "ipv4")
    IPV4=true
    ;;
  "6" | "ipv6")
    IPV6=true
    ;;
  "version" )
    version
    exit 0
    ;;
  esac
done

[ "${#ARGUMENTS[@]}" -eq 2 ] || usage 1 >&2

DEFINITION_PATH="${ARGUMENTS[0]}"
if [ -z "$DEFINITION_PATH" ]; then
  usage 1 >&2
elif [ ! -f "$DEFINITION_PATH" ]; then
  for DEFINITION_DIR in "${RUBY_BUILD_DEFINITIONS[@]}"; do
    if [ -f "${DEFINITION_DIR}/${DEFINITION_PATH}" ]; then
      DEFINITION_PATH="${DEFINITION_DIR}/${DEFINITION_PATH}"
      break
    fi
  done

  if [ ! -f "$DEFINITION_PATH" ]; then
    echo "ruby-build: definition not found: ${DEFINITION_PATH}" >&2
    exit 2
  fi
fi

PREFIX_PATH="${ARGUMENTS[1]}"
if [ -z "$PREFIX_PATH" ]; then
  usage 1 >&2
elif [ "${PREFIX_PATH#/}" = "$PREFIX_PATH" ]; then
  PREFIX_PATH="${PWD}/${PREFIX_PATH}"
fi

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

# Check if TMPDIR is accessible and can hold executables.
tmp_executable="${TMP}/ruby-build-test.$$"
noexec=""
if mkdir -p "$TMP" && touch "$tmp_executable" 2>/dev/null; then
  cat > "$tmp_executable" <<-EOF
	#!${BASH}
	exit 0
	EOF
  chmod +x "$tmp_executable"
else
  echo "ruby-build: TMPDIR=$TMP is set to a non-accessible location" >&2
  exit 1
fi
"$tmp_executable" 2>/dev/null || noexec=1
rm -f "$tmp_executable"
if [ -n "$noexec" ]; then
  echo "ruby-build: TMPDIR=$TMP cannot hold executables (partition possibly mounted with \`noexec\`)" >&2
  exit 1
fi

# Apply following work around, if gcc is not installed.
if [ -z "$(locate_gcc)" ]; then
  # Work around warnings building Ruby 2.0 on Clang 2.x:
  # pass -Wno-error=shorten-64-to-32 if the compiler accepts it.
  #
  # When we set CFLAGS, Ruby won't apply its default flags, though. Since clang
  # builds 1.9.x and 2.x only, where -O3 is default, we can safely set that flag.
  # Ensure it's the first flag since later flags take precedence.
  if "${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
fi

if [ -z "$MAKE" ]; then
  if [ "FreeBSD" = "$(uname -s)" ]; then
    if [ $(echo $1 | sed 's/-.*$//') = "jruby" ]; then
      export MAKE="gmake"
    else
      if [ "$(uname -r | sed 's/[^[:digit:]].*//')" -lt 10 ]; then
        export MAKE="gmake"
      else
        export MAKE="make"
      fi
    fi
  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 "$RUBY_BUILD_MIRROR_URL" ]; then
  RUBY_BUILD_MIRROR_URL="https://dqw8nmjcqpjn7.cloudfront.net"
  RUBY_BUILD_DEFAULT_MIRROR=1
else
  RUBY_BUILD_MIRROR_URL="${RUBY_BUILD_MIRROR_URL%/}"
  RUBY_BUILD_DEFAULT_MIRROR=
fi

if [ -n "$RUBY_BUILD_SKIP_MIRROR" ] || ! has_checksum_support compute_sha2; then
  unset RUBY_BUILD_MIRROR_URL
fi

ARIA2_OPTS="${RUBY_BUILD_ARIA2_OPTS} ${IPV4+--disable-ipv6=true} ${IPV6+--disable-ipv6=false}"
CURL_OPTS="${RUBY_BUILD_CURL_OPTS} ${IPV4+--ipv4} ${IPV6+--ipv6}"
WGET_OPTS="${RUBY_BUILD_WGET_OPTS} ${IPV4+--inet4-only} ${IPV6+--inet6-only}"

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