Translate generator to module

Box_Type2_Generator.scad

@@ -1,24 +1,35 @@
-INNER_X=60;
-INNER_Y=60;
-INNER_Z=30;
-WALLSIZE=4;
-
-OVERLAP_Z=WALLSIZE;
 /*
+ * hello.scad! :)
+ * It is possible to use this generator in two ways:
+ * - Simply, generate boxes (see [1])
+ * - Include this file to generate boxes in other SCAD files (see [2])
+ *
+ * [1] Generate boxes
+ * Uncomment one of the three following lines: */
+// generate_box(INNER_X, INNER_Y, INNER_Z, WALLSIZE);
+// generate_box(INNER_X, INNER_Y, INNER_Z, WALLSIZE, OVERLAP_Z);
+// generate_box(INNER_X, INNER_Y, INNER_Z, WALLSIZE, OVERLAP_Z, [NOTCH_WIDTH, NOTCH_DEPTH]);
+// Small example for a box width inner size 60x60x30, wall size 4, wall-sized overlap and a small notch:
+generate_box(60, 60, 30, 4, 4, 5, 2);
+/*
+ * [2] Include & Generate
+ * Copy and paste this line to another file: */
+// use Box_Type2_Generator.scad;
+
+/* Some explanations to the parameters:
+ * === OVERLAP_Z ===
  * The size of the inner overlap size
  * Set OVERLAP_Z to 0 to deactivate the overlap area at all.
  * In most cases, it should be enough to set it to WALLSIZE.
- */
+ *
-
+ * === NOTCH_DEPTH ===
-NOTCH_WIDTH=5;
-NOTCH_DEPTH=2;
-/*
  * NOTCH_DEPTH < WALLSIZE for obvious reasons.
  * Set NOTCH_DEPTH to 0 to deactivate the notch at all.
  * Idea behind the notch: you can secure the box lid with e.g. a rubber band
  */
  
-difference() {
+module generate_box(INNER_X, INNER_Y, INNER_Z, WALLSIZE, OVERLAP_Z, NOTCH_WIDTH, NOTCH_DEPTH) {
+    difference() {
         union() {
             // The main box
             difference() {
@@ -42,4 +53,5 @@ difference() {
             translate([INNER_X/2-NOTCH_WIDTH/2+WALLSIZE, INNER_Y+WALLSIZE+NOTCH_DEPTH, 0])
             cube([NOTCH_WIDTH, NOTCH_DEPTH, INNER_Z+WALLSIZE*6]);
         }
+    }
 }