!7

static ImageSurface is;
static int i;

p-substance {
  if (l(args) == 0) fail("Need command line argument (image path)");
  showFile(new File(args[0]));
}

svoid showFile(final File file) {
  assertTrue("File not found: " + absolutePath(file), file.exists());
  BufferedImage img = loadBufferedImage(file);
  if (is != null) is.setImage(img); else {
    is = showImage_centered(file.getName(), img);
    
    File dir = file.getParentFile();
    final L<File> files = asList(listFiles(dir));
    i = indexOfPred(files, func(File f) { eq(f.getName(), file.getName()) });
    
    if (l(files) < 2) ret;
    registerLeftKey(getFrame(is), r {
      i = mod(i-1, l(files));
      showFile(files.get(i));
    });
    registerRightKey(getFrame(is), r {
      i = (i+1) % l(files);
      showFile(files.get(i));
    });
    registerMinusKeys(is, r { is.zoomOut(1.5) });
    registerPlusKeys(is, r { is.zoomIn(1.5) });
    registerKey(is, KeyEvent.VK_A, "A", r { is.setZoom(1.0) });
    registerKey(is, KeyEvent.VK_W, "W", r { is.zoomToWindow() });
    hideConsole();
  }
}