Added parameter validation in the elixir.bat file

The batch file now allows both erlang and elixir commands before the ".ex" file; if any unknown parameter is passed before the ".ex file", an error is thrown.

Author: ToJans

bin/elixir.bat

@@ -1,4 +1,5 @@
 @echo off
+SETLOCAL enabledelayedexpansion
 set argc=0
 for %%x in (%*) do set /A argc+=1
 if  %argc%== 0 (
@@ -25,20 +26,24 @@ goto :EOF
 
 :parseopts
 
-rem parameters for Erlang
+rem Parameters for Erlang
 set parsErlang=
 
-rem make sure we keep a copy of all parameters
+rem Make sure we keep a copy of all parameters
 set allPars=%*
 
-rem Recursive loop called for each parameter
+rem Optional parameters before the "-extra" parameter
+set beforeExtra=
+
+rem Recursive loop called for each parameter that parses the cmd line parameters
 :startloop
 set par=%1
 shift
 if "%par%"=="" (
   rem if no parameters defined
   goto :run
 )
+rem ******* ERLANG PARAMETERS **********************
 for /f "usebackq" %%m in (`echo %par%^|findstr \--detached`) do (
   set parsErlang=%parsErlang% -detached
   goto:startloop
@@ -62,6 +67,45 @@ for /f "usebackq" %%m in (`echo %par%^|findstr \--name`) do (
   shift
   goto:startloop
 )
-goto:startloop
+for /f "usebackq" %%m in (`echo %par%^|findstr \--erl`) do (
+  set beforeExtra=%beforeExtra% %~1
+  shift
+  goto:startloop
+)
+rem ******* elixir parameters **********************
+for /f "usebackq" %%m in (`echo %par%^|findstr \--v`) do (
+  goto:startloop
+)
+for /f "usebackq" %%m in (`echo %par%^|findstr \--compile`) do (
+  goto:startloop
+)
+for /f "usebackq" %%m in (`echo %par%^|findstr \--no-halt`) do (
+  goto:startloop
+)
+for /f "usebackq" %%m in (`echo %par%^|findstr \+iex`) do (
+  goto:startloop
+)
+for /f "usebackq" %%m in (`echo %par%^|findstr \+compile`) do (
+  goto:startloop
+)
+for /f "usebackq" %%m in (`echo %par%^|findstr \-[erS]`) do (
+  shift
+  goto:startloop
+)
+for /f "usebackq" %%m in (`echo %par%^|findstr \-p[raz]`) do (
+  shift
+  goto:startloop
+)
+for /f "usebackq" %%m in (`echo %par%^|findstr \--remsh`) do (
+  shift
+  goto:startloop
+)
+rem ******* elixir file **********************
+for /f "usebackq" %%m in (`echo %par%^|findstr \.ex`) do (
+  goto:run
+)
+REM Others should give a problem
+echo ERROR: Parameter %par% is not allowed before the .ex file
+exit /B -1
 :run
-erl -env ERL_LIBS %ERL_LIBS%;"%~dp0\..\lib" -noshell %ELIXIR_ERL_OPTS% %parsErlang% -s elixir start_cli -extra %allPars%
+echo erl -env ERL_LIBS %ERL_LIBS%;"%~dp0\..\lib" -noshell %ELIXIR_ERL_OPTS% %parsErlang% -s elixir start_cli %beforeExtra% -extra %*