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+; GIMP - The GNU Image Manipulation Program
+; Copyright (C) 1995 Spencer Kimball and Peter Mattis
+;
+; This program is free software: you can redistribute it and/or modify
+; it under the terms of the GNU General Public License as published by
+; the Free Software Foundation; either version 3 of the License, or
+; (at your option) any later version.
+;
+; This program is distributed in the hope that it will be useful,
+; but WITHOUT ANY WARRANTY; without even the implied warranty of
+; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+; GNU General Public License for more details.
+;
+; You should have received a copy of the GNU General Public License
+; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+; Resizes the image so as to include the selected layer.
+; The resulting image has the selected layer size.
+; Copyright (C) 2002 Chauk-Mean PROUM
+;
+(define (script-fu-util-image-resize-from-layer image layer)
+  (let* (
+        (width (car (gimp-drawable-width layer)))
+        (height (car (gimp-drawable-height layer)))
+        (posx (- (car (gimp-drawable-offsets layer))))
+        (posy (- (cadr (gimp-drawable-offsets layer))))
+        )
+
+    (gimp-image-resize image width height posx posy)
+  )
+)
+
+; Add the specified layers to the image.
+; The layers will be added in the given order below the
+; active layer.
+;
+(define (script-fu-util-image-add-layers image . layers)
+  (while (not (null? layers))
+    (let ((layer (car layers)))
+      (set! layers (cdr layers))
+      (gimp-image-insert-layer image layer 0 -1)
+      (gimp-image-lower-item image layer)
+    )
+  )
+)
+
+; Allow command line usage of GIMP such as:
+;
+;     gimp -i -b '(with-files "*.png" <body>)'
+;
+; where <body> is the code that handles whatever processing you want to
+; perform on the files. There are four variables that are available
+; within the <body>: 'basename', 'image', 'filename' and 'layer'.
+; The 'basename' is the name of the file with its extension removed,
+; while the other three variables are self-explanatory.
+; You basically write your code as though it were processing a single
+; 'image' and the 'with-files' macro applies it to all of the files
+; matching the pattern.
+;
+; For example, to invert the colors of all of the PNG files in the
+; start directory:
+;
+;    gimp -i -b '(with-files "*.png" (gimp-drawable-invert layer FALSE) \
+;                 (gimp-file-save 1 image layer filename filename ))'
+;
+; To do the same thing, but saving them as jpeg instead:
+;
+;    gimp -i -b '(with-files "*.png" (gimp-drawable-invert layer FALSE) \
+;                 (gimp-file-save 1 image layer \
+;                  (string-append basename ".jpg") \
+;                  (string-append basename ".jpg") ))'
+
+(define-macro (with-files pattern . body)
+  (let ((loop (gensym))
+        (filenames (gensym))
+        (filename (gensym)))
+    `(begin
+       (let ,loop ((,filenames (cadr (file-glob ,pattern 1))))
+         (unless (null? ,filenames)
+           (let* ((filename (car ,filenames))
+                  (image (catch #f (car (gimp-file-load RUN-NONINTERACTIVE
+                                                        filename
+                                                        filename ))))
+                  (layer (if image (car (gimp-image-get-active-layer image)) #f))
+                  (basename (unbreakupstr (butlast (strbreakup filename ".")) ".")))
+             (when image
+               ,@body
+               (gimp-image-delete image)))
+           (,loop (cdr ,filenames))
+         )
+       )
+     )
+  )
+)