render thumnails for multiple files

src/main/java/TerminalImageViewer.java

@@ -18,35 +18,77 @@ public class TerminalImageViewer {
       return;
     }
 
+    int start = 0;
     int w = 80 * 4;
-
+    if (args[0].equals("-w") && args.length > 2) {
-    for (int i = 0; i < args.length; i++) {
+      w = 4 * Integer.parseInt(args[1]);
-      String name = args[i];
+      start = 2;
-      if (name.equals("-w")) {
-        w = 4 * Integer.parseInt(args[++i]);
-        continue;
     }
 
-      BufferedImage original;
+    if (start == args.length - 1) {
-      if (name.startsWith("http://") || name.startsWith("https://")) {
+      String name = args[start];
-        URL url = new URL(name);
+
-        original = ImageIO.read(url);
+      BufferedImage original = loadImage(args[start]);
-      } else {
-        original = ImageIO.read(new File(args[0]));
-      }
 
       int ow = original.getWidth();
       int oh = original.getHeight();
       int h = oh * w / ow;
 
-      BufferedImage image = original;
+      if (w == ow) {
-      if (w != ow) {
+        dump(original);
-        image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
+      } else {
+        BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
         Graphics2D graphics = image.createGraphics();
         graphics.drawImage(original, 0, 0, w, h, null);
+        dump(image);
+      }
+    } else {
+      // Directory-style rendering.
+      int index = 0;
+      int cw = (w - 2 * 3 * 4) / 16;
+      int tw = cw * 4;
+      while (index < args.length) {
+        BufferedImage image = new BufferedImage(tw * 4 + 24, tw, BufferedImage.TYPE_INT_RGB);
+        Graphics2D graphics = image.createGraphics();
+        int count = 0;
+        StringBuilder sb = new StringBuilder();
+        while (index < args.length && count < 4) {
+          String name = args[index++];
+          try {
+            BufferedImage original = loadImage(name);
+            int cut = name.lastIndexOf('/');
+            sb.append(name.substring(cut + 1));
+            int th = original.getHeight() * tw / original.getWidth();
+            graphics.drawImage(original, count * (tw + 8), (tw - th) / 2, tw, th, null);
+            count++;
+            int sl = count * (cw + 2);
+            while (sb.length() < sl - 2) {
+              sb.append(' ');
+            }
+            sb.setLength(sl - 2);
+            sb.append("  ");
+          } catch (Exception e) {
+            // Probably no image; ignore.
+          }
+        }
+        dump(image);
+        System.out.println(sb.toString());
+        System.out.println();
+      }
+    }
   }
 
-      ImageData imageData = new ImageData(w, h);
+  static BufferedImage loadImage(String name) throws IOException {
+    if (name.startsWith("http://") || name.startsWith("https://")) {
+      URL url = new URL(name);
+      return ImageIO.read(url);
+    }
+    return ImageIO.read(new File(name));
+  }
+
+  static void dump(BufferedImage image) {
+    int w = image.getWidth();
+    ImageData imageData = new ImageData(w, image.getHeight());
     byte[] data = imageData.data;
     int[] rgbArray = new int[w];
     for (int y = 0; y < image.getHeight(); y++) {
@@ -60,8 +102,7 @@ public class TerminalImageViewer {
         pos++;
       }
     }
-      System.out.println(imageData.dump());
+    System.out.print(imageData.dump());
-    }
   }
 
   /**