//      /bin/dev/_eval.c
//      Part of the TMI distribution mudlib and now part of Nightmare's
//      allows wizards to execute LPC code without writing new objects.
//      Created by Douglas Reay (Pallando @ TMI-2, Nightmare, etc) 92-12-07

#include <privs.h>
#include <lib.h>

inherit LIB_DAEMON;

#define SYNTAX "Syntax: \"eval <lpc commands>\".\n"

int cmd( string a )
{
  string file, filename;
  mixed err, ret;
string x,y;

    if(!member_group(previous_object(), PRIV_SECURE)) {
        log_file("adm/eval", query_privs(previous_object())+": "+a+"\n");
    }
  if( !a ) { notify_fail( SYNTAX ); return 0; }
// The includes in the file arn't necessary (and can be removed if the
// include files on your mud are called something different).  They
// just to make things like   "eval return children( USER )"    possible.
  file = ""+
"#include <lib.h>\n"+
"#include <daemons.h>\n"+
"#include <objects.h>\n"+
"#include <commands.h>\n"+
"inherit LIB_ITEM;\n"+
"mixed eval() { " + a + "; }\n"+
  "";
    filename = user_path((string)previous_object()->GetKeyName());
  if( file_size( filename ) != -2 ) 
    { notify_fail( "You must have a valid home directory!\n" ); return 0; }
  filename += "CMD_EVAL_TMP_FILE.c";
// long name so won't coincide with file already in your directory by accident
  rm( filename );
  if( ret = find_object( filename ) ) destruct( ret );
  write_file( filename, file );
// if( err = catch( ret = (mixed)call_other( filename, "eval" ) ) )
//   write( "Error = " + err );
//  else 
ret = (mixed)call_other(filename, "eval");
    write( wrap( "Result = " + identify( ret ) ) );
  rm( filename );
  if( ret = find_object( filename ) ) destruct( ret );
// Some muds prefer to change these lines so filename isn't deleted if
// an error occurs.  Also, if you don't have the identify() simul_efun
// the less through dump_variable() simul_efun can be used instead.
  return 1;
}

int help()
{
  write( SYNTAX + @EndText
Effect: calls a function containing <lpc commands>
Example: If you type:
  eval return 1 + cos( 0.0 )
the command creates a temporary file in your home dir containing the line:
  eval() { return 1 + cos( 0.0 ); }
then does call_other on the files's eval() function, giving:
  Result = 2.000000
EndText
  );
  return 1;
}