Fixes recursion (#33)

Author: FabioAntunes

functions/__nvm_run.fish

@@ -7,14 +7,15 @@ function __nvm_run
   end
 
   function run_command
+    set stack (status stack-trace | grep called | cut -d " " -f 7)
     set count (count $argv)
     if test "$count" -ge 2
       set args $argv[2..-1]
     else
       set args ""
     end
 
-    if type -fqP $argv[1]
+    if type -fqP $argv[1]; and test "$stack[1]" != (which $argv[1])
       # https://stackoverflow.com/questions/45237675/proxying-arguments-from-one-function-to-a-command/45238056#45238056
       eval (string escape -- (type -fP $argv[1]) $args)
     else