Update nvim setup script

nvim/setup

@@ -1,20 +1,117 @@
 #!/bin/sh
 
+set -e
+
 config="${HOME}/.config"
+uninstall=1
+remove=1
+copy=1
+link=0
+
+_usage() {
+  printf "\n" >&2
+  printf "Usage: setup [OPTIONS]\n" >&2
+  printf "\n" >&2
+  printf "Installs or Uninstalls nvim configuration files.\n" >&2
+  printf "\n" >&2
+  printf "Options:\n" >&2
+  printf "\t-c | --copy      : Copy the configuration files, instead of creating symlinks.\n" >&2
+  printf "\t-h | --help      : Print usage information.\n" >&2
+  printf "\t-l | --link      : Create symlinks to the configuration files (Default).\n" >&2
+  printf "\t-r | --remove    : Removes the entire ~/.config/nvim directory.\n" >&2
+  printf "\t-u | --uninstall : Uninstalls configuration files.\n" >&2
+  printf "\n" >&2
+  printf "If called without the uninstall option then it will install the configuration files.\n" >&2
+  printf "The copy and link options are ignored if called with the uninstall or remove option.\n" >&2
+  printf "\n" >&2
+}
+
+_parse_options() {
+  arg=
+  while ! test -z "$1"; do
+    arg="$1"
+    case $arg in
+      -c | --copy)
+        copy=0
+        link=1
+        shift;;
+      -h | --help)
+        _usage
+        exit;;
+      -l | --link)
+        copy=1
+        link=0
+        shift;;
+     -r | --remove)
+        remove=0
+        shift;;
+      -u | --uninstall)
+        uninstall=0
+        shift;;
+      *)
+        echo "Unknown option $arg" >&2
+        shift;;
+    esac
+  done
+}
 
 _make_dirs() {
-  test ! -d "${config}" && mkdir "${config}"
-  test ! -d "${config}/nvim" && mkdir "${config}/nvim"
+  if ! test -d "${config}"; then
+    mkdir "${config}"
+  fi
+  if ! test -d "${config}/nvim"; then
+    mkdir "${config}/nvim"
+  fi
 }
 
 _remove_nvim() {
+  echo "Removing nvim configuration..." >&2
   test -d "${config}/nvim" && rm -r "${config}/nvim"
 }
 
+_uninstall_nvim() {
+  echo "Uninstalling nvim configuration..." >&2
+  test -e "${config}/nvim/init.lua" && rm "${config}/nvim/init.lua"
+  test -d "${config}/nvim/lua" && rm "${config}/nvim/lua"
+}
+
 _link_nvim() {
+  echo "Linking nvim configuration..." >&2
   ln -sfv "${PWD}/init.lua" "${config}/nvim"
   ln -sfv "${PWD}/lua" "${config}/nvim"
 }
 
-#------------------------------- main ------------------------------ 
-_make_dirs && _link_nvim
+_copy_nvim() {
+  echo "Linking nvim configuration..." >&2
+  cp "${PWD}/init.lua" "${config}/nvim"
+  cp -r "${PWD}/lua" "${config}/nvim"
+}
+
+_install_nvim() {
+  _make_dirs
+  # copy if in copy mode
+  test "$copy" -eq 0 && _copy_nvim && exit "$?"
+  # link if in link mode
+  test "$link" -eq 0 && _link_nvim && exit "$?"
+  # else we don't know what to do
+  echo "Neither link or copy options were set. Use the --help option" >&2
+  exit 1
+}
+
+#------------------------------- main ------------------------------
+
+main() {
+  _parse_options "$@"
+
+  # check if remove is called first
+  test $remove -eq 0 && _remove_nvim && exit "$?"
+
+  # then check if uninstall was called
+  test $uninstall -eq 0 && _uninstall_nvim && exit "$?"
+
+  # else install the configuration files
+  _install_nvim
+  echo "Nvim will need to be started for vim plugins to download."
+}
+
+main "$@"