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[gimp] Simplify command line processing by adding a 'with-files' macro.

commit b6611b94ad036b25fad7f5aaa10778d8056aa55d
Author: saul <saul crazyauntgail com>
Date:   Sun Mar 23 20:36:06 2014 -0400

    Simplify command line processing by adding a 'with-files' macro.

 plug-ins/script-fu/scripts/script-fu-util.scm |   38 +++++++++++++++++++++++++
 1 files changed, 38 insertions(+), 0 deletions(-)
---
diff --git a/plug-ins/script-fu/scripts/script-fu-util.scm b/plug-ins/script-fu/scripts/script-fu-util.scm
index 546b1ed..09af751 100644
--- a/plug-ins/script-fu/scripts/script-fu-util.scm
+++ b/plug-ins/script-fu/scripts/script-fu-util.scm
@@ -44,3 +44,41 @@
   )
 )
 
+; 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 three variables that are available within
+; the <body>: 'basename', 'image', and 'layer'. The 'basename' is the
+; name of the file with its extension removed, while the other two
+; 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-invert layer) \
+;                  (gimp-file-save 1 image layer \
+;                                  (string-append basename ".png") \
+;                                  (string-append basename ".png") ))'
+
+(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))))
+       (gimp-quit 0))))
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