Tutorial: Eagle PCB ULP to write Script that Changes all the Devices in a library to have Value = ON

You select a device in an opened library for edit by using this syntax:  edit deviceset

Value is set to an active editable value with the syntax:  value on

Thus on a meta level this script is going to do the following things for each part in the library:

• write the open device command to script file using syntax:  edit deviceset
• write the turn the device value to script file using syntax: value on
• repeat until all the parts in the library have been cycled through

This script will build upon the script that lists the devicesets in a library.

//—— Get the ULP Path ——//

string ULP_Path;
char bkslash = '/';
int pos = strrchr(argv[0], bkslash);

  if (pos >= 0) 
    { 
      ULP_Path = strsub(argv[0], 0, pos + 1);
    }

output(ULP_Path + "TurnValueOnAllParts.scr", "wt"){library(L) { L.devicesets(D) { printf("edit " +  D.name + ".dev" + "\n"); 
                                                                                  printf("value on \n");
                               
                               }}}

Note that the script cycles through devicesets and not devices.