[Fix] ensure `--help` is intercepted on any command

Co-authored-by: Naomi Quinones <52065567+naomiquinones@users.noreply.github.com>
Co-authored-by: Dena Burd <me@Denas-MacBook-Air.local>

nvm.sh

@@ -2345,16 +2345,10 @@ nvm() {
     return $?
   fi
 
-  local COMMAND
+  for i in "$@"
-  COMMAND="${1-}"
+  do
-  shift
+    case $i in
-
+      '-h'|'help'|'--help')
-  # initialize local variables
-  local VERSION
-  local ADDITIONAL_PARAMETERS
-
-  case $COMMAND in
-    'help' | '--help')
         local NVM_IOJS_PREFIX
         NVM_IOJS_PREFIX="$(nvm_iojs_prefix)"
         local NVM_NODE_PREFIX
@@ -2434,8 +2428,20 @@ nvm() {
         nvm_echo 'Note:'
         nvm_echo '  to remove, delete, or uninstall nvm - just remove the `$NVM_DIR` folder (usually `~/.nvm`)'
         nvm_echo
+        return 0;
       ;;
+    esac
+  done
 
+  local COMMAND
+  COMMAND="${1-}"
+  shift
+
+  # initialize local variables
+  local VERSION
+  local ADDITIONAL_PARAMETERS
+
+  case $COMMAND in
     "cache")
       case "${1-}" in
         dir) nvm_cache_dir ;;

test/fast/Unit tests/nvm_check_for_help

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+die () { echo "$@" ; exit 1; }
+
+\. ../../../nvm.sh
+
+TERM=dumb nvm clear-cache --help | grep 'Usage:' || die 'did not print help menu'
+TERM=dumb nvm cache help version | grep 'Usage:' || die 'did not print help menu'
+TERM=dumb nvm cache -h version| grep 'Usage:' || die 'did not print help menu'