diff --git a/install-nvm.sh b/install-nvm.sh
index e6bc1f9..af8fb6e 100755
--- a/install-nvm.sh
+++ b/install-nvm.sh
@@ -1,7 +1,463 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
-echo "Usage: this-script.sh"
+{ # this ensures the entire script is downloaded #
 
-defaultVersion=0.39.0
+nvm_has() {
+  type "$1" > /dev/null 2>&1
+}
 
-curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v$defaultVersion/install.sh | bash
+nvm_echo() {
+  command printf %s\\n "$*" 2>/dev/null
+}
+
+nvm_grep() {
+  GREP_OPTIONS='' command grep "$@"
+}
+
+nvm_default_install_dir() {
+  [ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm"
+}
+
+nvm_install_dir() {
+  if [ -n "$NVM_DIR" ]; then
+    printf %s "${NVM_DIR}"
+  else
+    nvm_default_install_dir
+  fi
+}
+
+nvm_latest_version() {
+  nvm_echo "v0.39.0"
+}
+
+nvm_profile_is_bash_or_zsh() {
+  local TEST_PROFILE
+  TEST_PROFILE="${1-}"
+  case "${TEST_PROFILE-}" in
+    *"/.bashrc" | *"/.bash_profile" | *"/.zshrc")
+      return
+    ;;
+    *)
+      return 1
+    ;;
+  esac
+}
+
+#
+# Outputs the location to NVM depending on:
+# * The availability of $NVM_SOURCE
+# * The method used ("script" or "git" in the script, defaults to "git")
+# NVM_SOURCE always takes precedence unless the method is "script-nvm-exec"
+#
+nvm_source() {
+  local NVM_GITHUB_REPO
+  NVM_GITHUB_REPO="${NVM_INSTALL_GITHUB_REPO:-nvm-sh/nvm}"
+  local NVM_VERSION
+  NVM_VERSION="${NVM_INSTALL_VERSION:-$(nvm_latest_version)}"
+  local NVM_METHOD
+  NVM_METHOD="$1"
+  local NVM_SOURCE_URL
+  NVM_SOURCE_URL="$NVM_SOURCE"
+  if [ "_$NVM_METHOD" = "_script-nvm-exec" ]; then
+    NVM_SOURCE_URL="https://raw.githubusercontent.com/${NVM_GITHUB_REPO}/${NVM_VERSION}/nvm-exec"
+  elif [ "_$NVM_METHOD" = "_script-nvm-bash-completion" ]; then
+    NVM_SOURCE_URL="https://raw.githubusercontent.com/${NVM_GITHUB_REPO}/${NVM_VERSION}/bash_completion"
+  elif [ -z "$NVM_SOURCE_URL" ]; then
+    if [ "_$NVM_METHOD" = "_script" ]; then
+      NVM_SOURCE_URL="https://raw.githubusercontent.com/${NVM_GITHUB_REPO}/${NVM_VERSION}/nvm.sh"
+    elif [ "_$NVM_METHOD" = "_git" ] || [ -z "$NVM_METHOD" ]; then
+      NVM_SOURCE_URL="https://github.com/${NVM_GITHUB_REPO}.git"
+    else
+      nvm_echo >&2 "Unexpected value \"$NVM_METHOD\" for \$NVM_METHOD"
+      return 1
+    fi
+  fi
+  nvm_echo "$NVM_SOURCE_URL"
+}
+
+#
+# Node.js version to install
+#
+nvm_node_version() {
+  nvm_echo "$NODE_VERSION"
+}
+
+nvm_download() {
+  if nvm_has "curl"; then
+    curl --fail --compressed -q "$@"
+  elif nvm_has "wget"; then
+    # Emulate curl with wget
+    ARGS=$(nvm_echo "$@" | command sed -e 's/--progress-bar /--progress=bar /' \
+                            -e 's/--compressed //' \
+                            -e 's/--fail //' \
+                            -e 's/-L //' \
+                            -e 's/-I /--server-response /' \
+                            -e 's/-s /-q /' \
+                            -e 's/-sS /-nv /' \
+                            -e 's/-o /-O /' \
+                            -e 's/-C - /-c /')
+    # shellcheck disable=SC2086
+    eval wget $ARGS
+  fi
+}
+
+install_nvm_from_git() {
+  local INSTALL_DIR
+  INSTALL_DIR="$(nvm_install_dir)"
+  local NVM_VERSION
+  NVM_VERSION="${NVM_INSTALL_VERSION:-$(nvm_latest_version)}"
+  if [ -n "${NVM_INSTALL_VERSION:-}" ]; then
+    # Check if version is an existing ref
+    if command git ls-remote "$(nvm_source "git")" "$NVM_VERSION" | nvm_grep -q "$NVM_VERSION" ; then
+      :
+    # Check if version is an existing changeset
+    elif ! nvm_download -o /dev/null "$(nvm_source "script-nvm-exec")"; then
+      nvm_echo >&2 "Failed to find '$NVM_VERSION' version."
+      exit 1
+    fi
+  fi
+
+  local fetch_error
+  if [ -d "$INSTALL_DIR/.git" ]; then
+    # Updating repo
+    nvm_echo "=> nvm is already installed in $INSTALL_DIR, trying to update using git"
+    command printf '\r=> '
+    fetch_error="Failed to update nvm with $NVM_VERSION, run 'git fetch' in $INSTALL_DIR yourself."
+  else
+    fetch_error="Failed to fetch origin with $NVM_VERSION. Please report this!"
+    nvm_echo "=> Downloading nvm from git to '$INSTALL_DIR'"
+    command printf '\r=> '
+    mkdir -p "${INSTALL_DIR}"
+    if [ "$(ls -A "${INSTALL_DIR}")" ]; then
+      # Initializing repo
+      command git init "${INSTALL_DIR}" || {
+        nvm_echo >&2 'Failed to initialize nvm repo. Please report this!'
+        exit 2
+      }
+      command git --git-dir="${INSTALL_DIR}/.git" remote add origin "$(nvm_source)" 2> /dev/null \
+        || command git --git-dir="${INSTALL_DIR}/.git" remote set-url origin "$(nvm_source)" || {
+        nvm_echo >&2 'Failed to add remote "origin" (or set the URL). Please report this!'
+        exit 2
+      }
+    else
+      # Cloning repo
+      command git clone "$(nvm_source)" --depth=1 "${INSTALL_DIR}" || {
+        nvm_echo >&2 'Failed to clone nvm repo. Please report this!'
+        exit 2
+      }
+    fi
+  fi
+  # Try to fetch tag
+  if command git --git-dir="$INSTALL_DIR"/.git --work-tree="$INSTALL_DIR" fetch origin tag "$NVM_VERSION" --depth=1 2>/dev/null; then
+    :
+  # Fetch given version
+  elif ! command git --git-dir="$INSTALL_DIR"/.git --work-tree="$INSTALL_DIR" fetch origin "$NVM_VERSION" --depth=1; then
+    nvm_echo >&2 "$fetch_error"
+    exit 1
+  fi
+  command git -c advice.detachedHead=false --git-dir="$INSTALL_DIR"/.git --work-tree="$INSTALL_DIR" checkout -f --quiet FETCH_HEAD || {
+    nvm_echo >&2 "Failed to checkout the given version $NVM_VERSION. Please report this!"
+    exit 2
+  }
+  if [ -n "$(command git --git-dir="$INSTALL_DIR"/.git --work-tree="$INSTALL_DIR" show-ref refs/heads/master)" ]; then
+    if command git --git-dir="$INSTALL_DIR"/.git --work-tree="$INSTALL_DIR" branch --quiet 2>/dev/null; then
+      command git --git-dir="$INSTALL_DIR"/.git --work-tree="$INSTALL_DIR" branch --quiet -D master >/dev/null 2>&1
+    else
+      nvm_echo >&2 "Your version of git is out of date. Please update it!"
+      command git --git-dir="$INSTALL_DIR"/.git --work-tree="$INSTALL_DIR" branch -D master >/dev/null 2>&1
+    fi
+  fi
+
+  nvm_echo "=> Compressing and cleaning up git repository"
+  if ! command git --git-dir="$INSTALL_DIR"/.git --work-tree="$INSTALL_DIR" reflog expire --expire=now --all; then
+    nvm_echo >&2 "Your version of git is out of date. Please update it!"
+  fi
+  if ! command git --git-dir="$INSTALL_DIR"/.git --work-tree="$INSTALL_DIR" gc --auto --aggressive --prune=now ; then
+    nvm_echo >&2 "Your version of git is out of date. Please update it!"
+  fi
+  return
+}
+
+#
+# Automatically install Node.js
+#
+nvm_install_node() {
+  local NODE_VERSION_LOCAL
+  NODE_VERSION_LOCAL="$(nvm_node_version)"
+
+  if [ -z "$NODE_VERSION_LOCAL" ]; then
+    return 0
+  fi
+
+  nvm_echo "=> Installing Node.js version $NODE_VERSION_LOCAL"
+  nvm install "$NODE_VERSION_LOCAL"
+  local CURRENT_NVM_NODE
+
+  CURRENT_NVM_NODE="$(nvm_version current)"
+  if [ "$(nvm_version "$NODE_VERSION_LOCAL")" == "$CURRENT_NVM_NODE" ]; then
+    nvm_echo "=> Node.js version $NODE_VERSION_LOCAL has been successfully installed"
+  else
+    nvm_echo >&2 "Failed to install Node.js $NODE_VERSION_LOCAL"
+  fi
+}
+
+install_nvm_as_script() {
+  local INSTALL_DIR
+  INSTALL_DIR="$(nvm_install_dir)"
+  local NVM_SOURCE_LOCAL
+  NVM_SOURCE_LOCAL="$(nvm_source script)"
+  local NVM_EXEC_SOURCE
+  NVM_EXEC_SOURCE="$(nvm_source script-nvm-exec)"
+  local NVM_BASH_COMPLETION_SOURCE
+  NVM_BASH_COMPLETION_SOURCE="$(nvm_source script-nvm-bash-completion)"
+
+  # Downloading to $INSTALL_DIR
+  mkdir -p "$INSTALL_DIR"
+  if [ -f "$INSTALL_DIR/nvm.sh" ]; then
+    nvm_echo "=> nvm is already installed in $INSTALL_DIR, trying to update the script"
+  else
+    nvm_echo "=> Downloading nvm as script to '$INSTALL_DIR'"
+  fi
+  nvm_download -s "$NVM_SOURCE_LOCAL" -o "$INSTALL_DIR/nvm.sh" || {
+    nvm_echo >&2 "Failed to download '$NVM_SOURCE_LOCAL'"
+    return 1
+  } &
+  nvm_download -s "$NVM_EXEC_SOURCE" -o "$INSTALL_DIR/nvm-exec" || {
+    nvm_echo >&2 "Failed to download '$NVM_EXEC_SOURCE'"
+    return 2
+  } &
+  nvm_download -s "$NVM_BASH_COMPLETION_SOURCE" -o "$INSTALL_DIR/bash_completion" || {
+    nvm_echo >&2 "Failed to download '$NVM_BASH_COMPLETION_SOURCE'"
+    return 2
+  } &
+  for job in $(jobs -p | command sort)
+  do
+    wait "$job" || return $?
+  done
+  chmod a+x "$INSTALL_DIR/nvm-exec" || {
+    nvm_echo >&2 "Failed to mark '$INSTALL_DIR/nvm-exec' as executable"
+    return 3
+  }
+}
+
+nvm_try_profile() {
+  if [ -z "${1-}" ] || [ ! -f "${1}" ]; then
+    return 1
+  fi
+  nvm_echo "${1}"
+}
+
+#
+# Detect profile file if not specified as environment variable
+# (eg: PROFILE=~/.myprofile)
+# The echo'ed path is guaranteed to be an existing file
+# Otherwise, an empty string is returned
+#
+nvm_detect_profile() {
+  if [ "${PROFILE-}" = '/dev/null' ]; then
+    # the user has specifically requested NOT to have nvm touch their profile
+    return
+  fi
+
+  if [ -n "${PROFILE}" ] && [ -f "${PROFILE}" ]; then
+    nvm_echo "${PROFILE}"
+    return
+  fi
+
+  local DETECTED_PROFILE
+  DETECTED_PROFILE=''
+
+  if [ "${SHELL#*bash}" != "$SHELL" ]; then
+    if [ -f "$HOME/.bashrc" ]; then
+      DETECTED_PROFILE="$HOME/.bashrc"
+    elif [ -f "$HOME/.bash_profile" ]; then
+      DETECTED_PROFILE="$HOME/.bash_profile"
+    fi
+  elif [ "${SHELL#*zsh}" != "$SHELL" ]; then
+    if [ -f "$HOME/.zshrc" ]; then
+      DETECTED_PROFILE="$HOME/.zshrc"
+    fi
+  fi
+
+  if [ -z "$DETECTED_PROFILE" ]; then
+    for EACH_PROFILE in ".profile" ".bashrc" ".bash_profile" ".zshrc"
+    do
+      if DETECTED_PROFILE="$(nvm_try_profile "${HOME}/${EACH_PROFILE}")"; then
+        break
+      fi
+    done
+  fi
+
+  if [ -n "$DETECTED_PROFILE" ]; then
+    nvm_echo "$DETECTED_PROFILE"
+  fi
+}
+
+#
+# Check whether the user has any globally-installed npm modules in their system
+# Node, and warn them if so.
+#
+nvm_check_global_modules() {
+  local NPM_COMMAND
+  NPM_COMMAND="$(command -v npm 2>/dev/null)" || return 0
+  [ -n "${NVM_DIR}" ] && [ -z "${NPM_COMMAND%%$NVM_DIR/*}" ] && return 0
+
+  local NPM_VERSION
+  NPM_VERSION="$(npm --version)"
+  NPM_VERSION="${NPM_VERSION:--1}"
+  [ "${NPM_VERSION%%[!-0-9]*}" -gt 0 ] || return 0
+
+  local NPM_GLOBAL_MODULES
+  NPM_GLOBAL_MODULES="$(
+    npm list -g --depth=0 |
+    command sed -e '/ npm@/d' -e '/ (empty)$/d'
+  )"
+
+  local MODULE_COUNT
+  MODULE_COUNT="$(
+    command printf %s\\n "$NPM_GLOBAL_MODULES" |
+    command sed -ne '1!p' |                     # Remove the first line
+    wc -l | command tr -d ' '                   # Count entries
+  )"
+
+  if [ "${MODULE_COUNT}" != '0' ]; then
+    # shellcheck disable=SC2016
+    nvm_echo '=> You currently have modules installed globally with `npm`. These will no'
+    # shellcheck disable=SC2016
+    nvm_echo '=> longer be linked to the active version of Node when you install a new node'
+    # shellcheck disable=SC2016
+    nvm_echo '=> with `nvm`; and they may (depending on how you construct your `$PATH`)'
+    # shellcheck disable=SC2016
+    nvm_echo '=> override the binaries of modules installed with `nvm`:'
+    nvm_echo
+
+    command printf %s\\n "$NPM_GLOBAL_MODULES"
+    nvm_echo '=> If you wish to uninstall them at a later point (or re-install them under your'
+    # shellcheck disable=SC2016
+    nvm_echo '=> `nvm` Nodes), you can remove them from the system Node as follows:'
+    nvm_echo
+    nvm_echo '     $ nvm use system'
+    nvm_echo '     $ npm uninstall -g a_module'
+    nvm_echo
+  fi
+}
+
+nvm_do_install() {
+  if [ -n "${NVM_DIR-}" ] && ! [ -d "${NVM_DIR}" ]; then
+    if [ -e "${NVM_DIR}" ]; then
+      nvm_echo >&2 "File \"${NVM_DIR}\" has the same name as installation directory."
+      exit 1
+    fi
+
+    if [ "${NVM_DIR}" = "$(nvm_default_install_dir)" ]; then
+      mkdir "${NVM_DIR}"
+    else
+      nvm_echo >&2 "You have \$NVM_DIR set to \"${NVM_DIR}\", but that directory does not exist. Check your profile files and environment."
+      exit 1
+    fi
+  fi
+  if [ -z "${METHOD}" ]; then
+    # Autodetect install method
+    if nvm_has git; then
+      install_nvm_from_git
+    elif nvm_has nvm_download; then
+      install_nvm_as_script
+    else
+      nvm_echo >&2 'You need git, curl, or wget to install nvm'
+      exit 1
+    fi
+  elif [ "${METHOD}" = 'git' ]; then
+    if ! nvm_has git; then
+      nvm_echo >&2 "You need git to install nvm"
+      exit 1
+    fi
+    install_nvm_from_git
+  elif [ "${METHOD}" = 'script' ]; then
+    if ! nvm_has nvm_download; then
+      nvm_echo >&2 "You need curl or wget to install nvm"
+      exit 1
+    fi
+    install_nvm_as_script
+  else
+    nvm_echo >&2 "The environment variable \$METHOD is set to \"${METHOD}\", which is not recognized as a valid installation method."
+    exit 1
+  fi
+
+  nvm_echo
+
+  local NVM_PROFILE
+  NVM_PROFILE="$(nvm_detect_profile)"
+  local PROFILE_INSTALL_DIR
+  PROFILE_INSTALL_DIR="$(nvm_install_dir | command sed "s:^$HOME:\$HOME:")"
+
+  SOURCE_STR="\\nexport NVM_DIR=\"${PROFILE_INSTALL_DIR}\"\\n[ -s \"\$NVM_DIR/nvm.sh\" ] && \\. \"\$NVM_DIR/nvm.sh\"  # This loads nvm\\n"
+
+  # shellcheck disable=SC2016
+  COMPLETION_STR='[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion\n'
+  BASH_OR_ZSH=false
+
+  if [ -z "${NVM_PROFILE-}" ] ; then
+    local TRIED_PROFILE
+    if [ -n "${PROFILE}" ]; then
+      TRIED_PROFILE="${NVM_PROFILE} (as defined in \$PROFILE), "
+    fi
+    nvm_echo "=> Profile not found. Tried ${TRIED_PROFILE-}~/.bashrc, ~/.bash_profile, ~/.zshrc, and ~/.profile."
+    nvm_echo "=> Create one of them and run this script again"
+    nvm_echo "   OR"
+    nvm_echo "=> Append the following lines to the correct file yourself:"
+    command printf "${SOURCE_STR}"
+    nvm_echo
+  else
+    if nvm_profile_is_bash_or_zsh "${NVM_PROFILE-}"; then
+      BASH_OR_ZSH=true
+    fi
+    if ! command grep -qc '/nvm.sh' "$NVM_PROFILE"; then
+      nvm_echo "=> Appending nvm source string to $NVM_PROFILE"
+      command printf "${SOURCE_STR}" >> "$NVM_PROFILE"
+    else
+      nvm_echo "=> nvm source string already in ${NVM_PROFILE}"
+    fi
+    # shellcheck disable=SC2016
+    if ${BASH_OR_ZSH} && ! command grep -qc '$NVM_DIR/bash_completion' "$NVM_PROFILE"; then
+      nvm_echo "=> Appending bash_completion source string to $NVM_PROFILE"
+      command printf "$COMPLETION_STR" >> "$NVM_PROFILE"
+    else
+      nvm_echo "=> bash_completion source string already in ${NVM_PROFILE}"
+    fi
+  fi
+  if ${BASH_OR_ZSH} && [ -z "${NVM_PROFILE-}" ] ; then
+    nvm_echo "=> Please also append the following lines to the if you are using bash/zsh shell:"
+    command printf "${COMPLETION_STR}"
+  fi
+
+  # Source nvm
+  # shellcheck source=/dev/null
+  \. "$(nvm_install_dir)/nvm.sh"
+
+  nvm_check_global_modules
+
+  nvm_install_node
+
+  nvm_reset
+
+  nvm_echo "=> Close and reopen your terminal to start using nvm or run the following to use it now:"
+  command printf "${SOURCE_STR}"
+  if ${BASH_OR_ZSH} ; then
+    command printf "${COMPLETION_STR}"
+  fi
+}
+
+#
+# Unsets the various functions defined
+# during the execution of the install script
+#
+nvm_reset() {
+  unset -f nvm_has nvm_install_dir nvm_latest_version nvm_profile_is_bash_or_zsh \
+    nvm_source nvm_node_version nvm_download install_nvm_from_git nvm_install_node \
+    install_nvm_as_script nvm_try_profile nvm_detect_profile nvm_check_global_modules \
+    nvm_do_install nvm_reset nvm_default_install_dir nvm_grep
+}
+
+[ "_$NVM_ENV" = "_testing" ] || nvm_do_install
+
+} # this ensures the entire script is downloaded #