I wan to run this code on a folder containing around 1000 files (requires geomerative)

1. import processing.opengl.*;
   import processing.xml.*;
   import geomerative.*;
   import java.io.*;
   
   RShape shp;
   RShape polyshp;
   
   String svgfile;
   
   float svgborder=20;
   float svgaspect,svgwidth,svgheight;
   
   void setup() {
     size(600, 600, P3D);
     colorMode(RGB, 255);
     frameRate(1000);
   
     // VERY IMPORTANT: Allways initialize the library before using it
     RG.init(this);
   
     svgfile = selectInput();
   
     if (svgfile != null)
     {
       shp = RG.loadShape(svgfile);
   
       shp = RG.centerIn(shp, g, svgborder);
       shp.translate(width/2, height/2);
     }
   }
   
   //code to generate transparent image
   void greenScreen() {
     PGraphics frameToSave = createGraphics(width, height, P2D);
     frameToSave.beginDraw();
     loadPixels();
     frameToSave.loadPixels();
     float r,g,b;
     for (int i=0; i<pixels.length; i++) {
       r=red(pixels[i]);
       g=green(pixels[i]);
       b=blue(pixels[i]);
       if (r == 28 && g == 255 && b == 26) frameToSave.pixels[i]=color(r,g,b,0);
       else frameToSave.pixels[i]=color(r,g,b,255);
     }
   
     frameToSave.updatePixels();
     frameToSave.endDraw();
   
     int a = frameCount;
   
     frameToSave.save(svgfile+nf(a,5)+".png");
   }
   
   void draw() {
     background(28,255,26);
   
     // We decided the separation between the polygon points dependent of the mouseX
     float pointSeparation = map(constrain(frameCount+100, 100, width-100), 100, width-100, 5, 200);
   
     // We create the polygonized version
     RG.setPolygonizer(RG.UNIFORMLENGTH);
     RG.setPolygonizerLength(pointSeparation);
   
     polyshp = RG.polygonize(shp);
     RG.shape(polyshp);
   
     greenScreen();
   
   }
   

Currently I'm having to open each file individually and then decide whtn to stop it but I'd like the script to run and then select a new file after 20 seconds or so. The files currently have random names.

I'm familiar with how to do this in bash (for file in *.svg do...) but can something similar be accomplished in Processing?