This reads in GCODE file made by Cura (maybe other slicers work as well not tested) and prints usefull Information via M117 on the printer display

verbose-lcd.cpp

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

int main(int argc,char **argv){
  if ((argc>1)&&(strstr(argv[1],".gcode"))){
    char inname[2048],outname[2048],line[250],type[24]="-",msg[41];
    strncpy(inname,argv[1],2046);
    inname[strlen(inname)-6]='\0';
    sprintf(outname,"%s_verbose.gcode",inname);
    FILE *g=fopen(argv[1],"rt");
    FILE *o=fopen(outname,"wt");
    fgets(line,248,g);
    int layers=0,l=-666;
    printf("reading %s ...\n",argv[1]);
    printf("writing %s ...\n",outname);
    while (!feof(g)) {
      if(line[0]==';'){
        if (NULL!=strstr(line,";LAYER_COUNT:")) sscanf(line,";LAYER_COUNT:%d",&layers);
        if (NULL!=strstr(line,";LAYER:")) sscanf(line,";LAYER:%d",&l);
        if (NULL!=strstr(line,";TYPE:" )) {
          sscanf(line,";TYPE:%s",type);
          sprintf(msg,"L%d/%-3d %-9s",l,layers,type);
          msg[19]='\0';
          msg[20]='\0';

          //        printf("%s %d %d %s %d %d %d %s \n",msg,l,layers,type, (NULL!=strstr(line,";LAYER_COUNT:")), (NULL!=strstr(line,";LAYER:")), (NULL!=strstr(line,";TYPE:" )), line);
          if ((l!=-666)&&(type[0]!='-')) fprintf(o,"M117 %-20s\r\n",msg);
        }   
      } 
      fprintf(o,"%s",line);     
      fgets(line,248,g);
    }
    fclose(g);
    fclose(o);
  }
  else fprintf(stderr,"USAGE: %s file.gcode\n",argv[0]);
  return 0;
}