[Refactor] add nvm_install_binary_extract

nvm.sh

@@ -1858,6 +1858,53 @@ nvm_get_mirror() {
   esac
 }
 
+# args: os, prefixed version, version, tarball, extract directory
+nvm_install_binary_extract() {
+  if [ "$#" -ne 5 ]; then
+    nvm_err 'nvm_install_binary_extract needs 5 parameters'
+    return 1
+  fi
+
+  local NVM_OS
+  local PREFIXED_VERSION
+  local VERSION
+  local TARBALL
+  local TMPDIR
+  NVM_OS="${1}"
+  PREFIXED_VERSION="${2}"
+  VERSION="${3}"
+  TARBALL="${4}"
+  TMPDIR="${5}"
+
+  local VERSION_PATH
+
+  [ -n "${TMPDIR-}" ] && \
+  command mkdir -p "${TMPDIR}" && \
+  VERSION_PATH="$(nvm_version_path "${PREFIXED_VERSION}")" || return 1
+
+  local tar_compression_flag
+  tar_compression_flag='z'
+  if nvm_supports_xz "${VERSION}"; then
+    tar_compression_flag='J'
+  fi
+
+  local tar
+  if [ "${NVM_OS}" = 'aix' ]; then
+    tar='gtar'
+  else
+    tar='tar'
+  fi
+  command "${tar}" -x${tar_compression_flag}f "${TARBALL}" -C "${TMPDIR}" --strip-components 1 || return 1
+
+  command mkdir -p "${VERSION_PATH}" || return 1
+
+  command mv "${TMPDIR}/"* "${VERSION_PATH}" || return 1
+
+  command rm -rf "${TMPDIR}"
+
+  return 0
+}
+
 # args: flavor, type, version, reinstall
 nvm_install_binary() {
   local FLAVOR
@@ -1882,19 +1929,15 @@ nvm_install_binary() {
   local VERSION
   VERSION="$(nvm_strip_iojs_prefix "${PREFIXED_VERSION}")"
 
-  if [ -z "$(nvm_get_os)" ]; then
-    return 2
-  fi
+  local NVM_OS
+  NVM_OS="$(nvm_get_os)"
 
-  local tar_compression_flag
-  tar_compression_flag='z'
-  if nvm_supports_xz "${VERSION}"; then
-    tar_compression_flag='J'
+  if [ -z "${NVM_OS}" ]; then
+    return 2
   fi
 
   local TARBALL
   local TMPDIR
-  local VERSION_PATH
 
   local PROGRESS_BAR
   local NODE_OR_IOJS
@@ -1914,21 +1957,8 @@ nvm_install_binary() {
   if [ -f "${TARBALL}" ]; then
     TMPDIR="$(dirname "${TARBALL}")/files"
   fi
-  local tar
-  tar='tar'
-  if [ "${NVM_OS}" = 'aix' ]; then
-    tar='gtar'
-  fi
-  if (
-    [ -n "${TMPDIR-}" ] && \
-    command mkdir -p "${TMPDIR}" && \
-    command "${tar}" -x${tar_compression_flag}f "${TARBALL}" -C "${TMPDIR}" --strip-components 1 && \
-    VERSION_PATH="$(nvm_version_path "${PREFIXED_VERSION}")" && \
-    command mkdir -p "${VERSION_PATH}" && \
-    command mv "${TMPDIR}/"* "${VERSION_PATH}" && \
-    command rm -rf "${TMPDIR}"
-  ); then
 
+  if nvm_install_binary_extract "${NVM_OS}" "${PREFIXED_VERSION}" "${VERSION}" "${TARBALL}" "${TMPDIR}"; then
     if [ -n "${ALIAS-}" ]; then
       nvm alias "${ALIAS}" "${provided_version}"
     fi
@@ -3957,7 +3987,7 @@ nvm() {
         nvm_npmrc_bad_news_bears \
         nvm_get_colors nvm_set_colors nvm_print_color_code nvm_format_help_message_colors \
         nvm_echo_with_colors nvm_err_with_colors \
-        nvm_get_artifact_compression \
+        nvm_get_artifact_compression nvm_install_binary_extract \
         >/dev/null 2>&1
       unset NVM_RC_VERSION NVM_NODEJS_ORG_MIRROR NVM_IOJS_ORG_MIRROR NVM_DIR \
         NVM_CD_FLAGS NVM_BIN NVM_INC NVM_MAKE_JOBS \