#usage "<b>Import an EAGLE Netscript into a Schematic</b>\n"
       "<p>"
       "Opens a file dialog to select a netscript file. "
       "Some PCB systems allow to export an EAGLE netscript file in order to make "
       "a layout in EAGLE. This ULP allows to use the netscript to generate an "
       "EAGLE schematic, too. At least it can be used to draw all net connections "
       "in the schematic easily, provided all parts have been placed before. "
       "<p>"
       "<b>Attention:</b><br>"
       "In special situations it could happen that importing a netlist "
       "into a schematic (in form of 'airwires' as it happens here) "
       "results in misconnections. This is the case if a net line "
       "overlaps a pin connection point. If this certain pin under the "
       "net should get connected later, EAGLE will connect to the net "
       "instead of the pin under it.<p>"
       "We want to avoid this problem in the ULP by drawing the net "
       "line from the first pin with an offset of 50 mil. This way "
       "diagonal net lines will be drawn and there will be hardly pins "
       "that lie under net lines.<p>"
       "If a net has to be drawn on a further sheet of the schematic "
       "EAGLE uses the diagonal offset of 50 mil and places an "
       "additional LABEL."
       "<p>"
       "<author>Author: support@cadsoft.de</author>"

// 2006-01-26 -- modified #usage  -- ric

// THIS PROGRAM IS PROVIDED AS IS AND WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED

/* German info
       "<b>ACHTUNG</b><p>\n"
       "Das Einlesen einer Netzliste (Airwire) in den Schaltplan, "
       "kann in besonderen Situationen zu falschen Verbindungen fuehren.<p>\n"
       "Werden die Netze als "Luftlinien" zwischen den Bauteilpins gezeichnet, "
       "so kann es vorkommen, dass eine Netzlinie Bauteilpins ueberlagert. "
       "Wird spaeter <b>dieser</b> Pin unter der Linie an ein Netz angeschlossen "
       "so nimmt EAGLE das Netz als Kontaktpunkt und nicht den "
       "darunterliegenden Pin.<p>"
       "In diesem ULP wird versucht diese Problematik zu umgehen, in dem vom "
       "ersten Pin mit einem Offset (50mil) vom Pin weg "
       "und dann zum zweiten Pin gezeichnet wird. Dadurch entstehen diagonale "
       "Luftlinien die nur in seltenen Faellen einen Pin ueberlagern.<p>\n"
       "Wird ein Netz auf einer anderen Schaltplanseite weitergefuehrt, "
       "so wird vom Pin um 50 Mil diagonal weggezeichnet und zusaetzlich "
       "ein <b>LABEL</b> plaziert.<p>\n"
*/

// Eagle NET-Command definition
string net_name = strupr(argv[1]);
string device_a = strupr(argv[2]);
string pin_a    = strupr(argv[3]);
string device_b = strupr(argv[4]);
string pin_b    = strupr(argv[5]);

string cmd = "";

string lines[];
int    nLines;
string s;

// *** Eagle NET-SCRIPT definition ***
string tok_Signal = "Signal";
string signalLines[];
string signalName;
int    signalCnt = 0;
string tok_Change = "Change";

// *** functions ***

int actSheet(UL_SHEET S)
{
  return S.number;
}

void readNetList(void)
{
   int sn = 0;
   do {
      if( strstr(lines[sn], tok_Signal) == 0) {
         signalCnt = strsplit (signalLines, lines[sn], '\'');
         // init NET command
         string netName = signalLines[1];
         string dev_a = signalLines[3];
         string pin_a = signalLines[5];
         string dev_b = "";
         string pin_b = "";
         // start NET command with run-cmd-net.ulp
         sn++;
         while (strstr(lines[sn], ";") < 0) {  // end of Signallist
            signalCnt = strsplit (signalLines, lines[sn], '\'');
            string dev_b = signalLines[1];
            string pin_b = signalLines[3];
            cmd += "run " + argv[0] + " '" + netName + "' '" + dev_a + "' '" + pin_a + "' ";
            cmd += "'" + dev_b + "' '" + pin_b + "' ;\n";
            dev_a = dev_b;
            pin_a = pin_b;
            sn++;
            }
         }
      if( strstr(lines[sn], tok_Change) == 0) {
         sprintf(s, "%s\n", lines[sn]);
         cmd += s;
         }
      sn++;
      } while (lines[sn]);
   return;
}

// *** MAIN ***
if (schematic) {

   // run as net command
   if (device_b && pin_b) {

      int pinA_sheet = 0;
      int pinB_sheet = 0;
      int xA, yA, xB, yB;
      string g = ";\nGRID LAST;\n";
      int actualsheet;
      if (sheet) sheet(SH) actualsheet = SH.number;

      // *** Schematic coord. ***
      schematic(S) {
         cmd = "SET WIRE_BEND 2;\nGRID MIL 50 2 ;\n";
         S.sheets(SH) {
            SH.parts(PA) {
               if (PA.name == device_a ) {
                  PA.instances(IN) {
                     IN.gate.symbol.pins(P) {  // Pin
                        if (P.contact) {
                           string cp = P.contact.name;        // PAD name von Connect/Pad
                           if (cp == pin_a) {
                              xA = P.x;
                              yA = P.y;
                              pinA_sheet = SH.number;
                              }
                           }
                        }
                     }
                  }
               if (device_b) {
                  if (PA.name == device_b ) {
                     PA.instances(IN) {
                        IN.gate.symbol.pins(P) {  // Pin
                           if (P.contact) {
                              string cp = P.contact.name;        // PAD name von Connect/Pad
                              if (cp == pin_b) {
                                 xB = P.x;
                                 yB = P.y;
                                 pinB_sheet = SH.number;
                                 }
                              }
                           }
                        }
                     }
                  }
               }
            }
         }
      if (net_name) net_name = "'" + net_name + "'";
         // place Name in ' ' for NET-Command

      string s;
      if ( (pinA_sheet != 0) && (pinB_sheet != 0) ) {
         if (pinA_sheet == pinB_sheet) {
            if (actualsheet != pinA_sheet) {
               sprintf(s, "EDIT .s%d;\n", pinA_sheet);
               cmd += s;
               }
            sprintf(s, "NET %s (%.3f %.3f)", net_name, u2mil(xA), u2mil(yA) );
            cmd += s;
            sprintf(s, " (%.3f %.3f)", u2mil(xA)+50, u2mil(yA)-50 );
            cmd += s;
            sprintf(s, " (%.3f %.3f);\n", u2mil(xB), u2mil(yB) );
            cmd += s;
            exit (cmd + g);
            }
         else {
            if (actualsheet != pinA_sheet) {
               sprintf(s, "EDIT .s%d;\n", pinA_sheet);
               cmd += s;
               }
            sprintf(s, "NET %s (%.3f %.3f)", net_name, u2mil(xA), u2mil(yA) );
            cmd += s;
            sprintf(s, " (%.3f %.3f);\n", u2mil(xA)+50, u2mil(yA)+50 );
            cmd += s;
            sprintf(s, "LABEL (%.3f %.3f)", u2mil(xA), u2mil(yA) );
            cmd += s;
            sprintf(s, " (%.3f %.3f);\n", u2mil(xA)+50, u2mil(yA)+50 );
            cmd += s;
            sprintf(s, "CHANGE LAYER 91 (%.3f %.3f);\n", u2mil(xA)+50, u2mil(yA)+50 );
            cmd += s;

            if (actualsheet != pinB_sheet) {
               sprintf(s, "EDIT .s%d;\n", pinB_sheet);
               cmd += s;
               }
            sprintf(s, "NET %s (%.3f %.3f)", net_name, u2mil(xB), u2mil(yB) );
            cmd += s;
            sprintf(s, " (%.3f %.3f);\n", u2mil(xB)+50, u2mil(yB)+50 );
            cmd += s;
            sprintf(s, "LABEL (%.3f %.3f)", u2mil(xB), u2mil(yB) );
            cmd += s;
            sprintf(s, " (%.3f %.3f);\n", u2mil(xB)+50, u2mil(yB)+50 );
            cmd += s;
            sprintf(s, "CHANGE LAYER 91 (%.3f %.3f);\n", u2mil(xB)+50, u2mil(yB)+50 );
            cmd += s;
            exit (cmd + g);
            }
         }
      else {
         cmd = "";
         if (pinA_sheet == 0) cmd += "Device " + device_a + " Pin " + pin_a + "\n";
         if (pinB_sheet == 0) cmd += "Device " + device_b + " Pin " + pin_b + "\n";
         cmd += "not fond!";
         dlgMessageBox(cmd, "OK");
         exit (-1);
         }
      }

   // run as script converter
   else {
      string ulp_path ;
      char bkslash = '/';
      int pos = strrchr(argv[0], bkslash);
      if (pos >= 0) {
         ulp_path = strsub(argv[0], 0, pos + 1);
         }

      // File handling
      int n = 0;
      string text;
      string NetListfileName;
      int nBytes;

      if (argv[1]) {
         NetListfileName = argv[1];
         }
      else {
         NetListfileName = dlgFileOpen("Select Script File", "*.scr", "*.*");
         }

      if (NetListfileName) {
         nLines = fileread(lines, NetListfileName);
         readNetList();
         }
      output(NetListfileName + "x", "wt") printf("%s", cmd);

      exit (cmd);
      }
   }
else {
   dlgMessageBox("Start this ULP from a schematic!", "OK");
   exit (0);
   }