#usage "<nobr>This ULP generates a script to clear layer(s) in library.<p>"
       "run clear-layer-in-lbr.ulp [YES] <b>layer</b> [layer] [layer] ....<br>"
       "YES = clear without confirmation.<br>"
       "Clear only layer in packages</nobr>"
       "<p>"
       "<author>Author: support@cadsoft.de</author>"


// ---------- parameter section -------------------------------------

string clrscript = "~clear~.scr";
string scriptfile;

int    layer_visible[];
int    clear_layer[];

int    cnt = 1;
int    clear_outo = 0;
string s;


// **** main ****
if (library) {
  string cmd;
  if (argc < 2) {
    dlgMessageBox("<nobr>Start this ulp from command line with parameter</nobr><p>Usage:<br>" + usage, "OK");
    exit(0);
  }
  if (argv[1] == "YES") { cnt = 2; clear_outo = 1; }
  for (int n = cnt; n <= argc; n++) {
    clear_layer[n] = strtol(argv[n]);
    cmd += argv[n] + "\n";
  }

  library(L) {
    L.layers(LY) {
      layer_visible[LY.number] = LY.visible;
    }
    scriptfile = filedir(L.name) + clrscript;
    output(scriptfile, "wtD") {
      printf("GRID MM FINEST;\nDISPLAY NONE ");
      for (int n = cnt; n < argc; n++) {
        printf(" %d", clear_layer[n]);
        if (clear_layer[n] == 21) {
          printf(" -23 -25 -27 -51");
        }
        if (clear_layer[n] == 22) {
          printf(" -24 -26 -28 -52");
        }
      }
      printf(";\n");

      L.packages(P) {
        sprintf(s, "Edit %s;\nCHANGE LAYER %d;\nRECT (%.4f %.4f)(%.4f %.4f);\nGROUP (%.4f %.4f) (%.4f %.4f) (%.4f %.4f) (%.4f %.4f) (%.4f %.4f);\nDELETE (>%.4f %.4f);\n",
                    P.name,
                    clear_layer[cnt],
                    u2mm(P.area.x1)/2, u2mm(P.area.y1)/2,
                    u2mm(P.area.x2)/2, u2mm(P.area.y2)/2,
                    u2mm(P.area.x1), u2mm(P.area.y1),
                    u2mm(P.area.x2), u2mm(P.area.y1),
                    u2mm(P.area.x2), u2mm(P.area.y2),
                    u2mm(P.area.x1), u2mm(P.area.y2),
                    u2mm(P.area.x1), u2mm(P.area.y1),
                    u2mm(P.area.x1), u2mm(P.area.y1) );
        if (clear_outo) {
          printf("%s", s);
        }
        else {
          if (dlgMessageBox("clear layer(s) in package:\n" + P.name, "Yes", "+No") == 0) {
            printf("%s", s);
          }
        }
      }
      printf("grid last;\n");
      printf("DISPLAY NONE ");
      for (int l = 255; l ; l--) {
        if (l == 99) l = 89;  // *** no Symbol Layer ***
        if (layer_visible[l]) printf(" %d", l);
      }
    }
  }
  exit("SCRIPT '" + scriptfile + "';");
}


dlgMessageBox("Start this ULP from a Library", "OK");
exit(0);