Replace perfectbound logic with sigsize = 1

It seems like we might be able to remove all the perfect bound logic,
and instead treat perfectbound as signature size of 1.

This would simply the codebase if true.

src/book.js

@@ -5,7 +5,6 @@
 import { PDFDocument, degrees, grayscale, rgb } from 'pdf-lib';
 import { saveAs } from 'file-saver';
 import { Signatures } from './signatures.js';
-import { PerfectBound } from './perfectbound.js';
 import { WackyImposition } from './wacky_imposition.js';
 import { PAGE_LAYOUTS, PAGE_SIZES, LINE_LEN } from './constants.js';
 import { updatePageLayoutInfo} from './utils/renderUtils.js';
@@ -193,13 +192,15 @@ export class Book {
 
         switch(this.format) {
             case 'perfect':
-                this.book = new PerfectBound(this.orderedpages, this.duplex, this.per_sheet, this.duplexrotate);
-                this.rearrangedpages = [this.book.pagelistdetails];
-                break;
             case 'booklet':
-                // Booklets are a special case where sig size is the total book size
-                this.sigsize = Math.ceil(this.orderedpages.length / this.per_sheet);
-                /* falls through */
+                if (this.format == 'perfect') {
+                    // Perfect bind is a special case where sig size is 1
+                    this.sigsize = 1;
+                } else {
+                    // Booklets are a special case where sig size is the total book size
+                    this.sigsize = Math.ceil(this.orderedpages.length / this.per_sheet);
+                }
+            /* falls through */
             case 'standardsig':
             case 'customsig':
                 this.book = new Signatures(this.orderedpages, this.duplex, this.sigsize, this.per_sheet, this.duplexrotate);

src/constants.js

@@ -147,33 +147,3 @@ export const BOOKLET_LAYOUTS = {
         rotate: [28, 5, 4, 29, 21, 12, 13, 20, 24, 9, 16, 17, 25, 8, 1, 32],
     },
 };
-
-export const PERFECTBOUND_LAYOUTS = {
-    /*
-    For page layouts: pages are 1-indexed for sanity reasons, and the order for the back list must be reversed
-
-    'front' will be the side that ends up with consecutive pagenumbers on the innermost fold, by convention.
-    
-    page numbers should be listed from left to right, top to bottom, starting in the top left.
-    */
-    4: {
-        front: [3, 2],
-        back: [1, 4],
-        rotate: [4, 1],
-    },
-    8: {
-        front: [4, 1, 7, 6],
-        back: [8, 5, 3, 2],
-        rotate: [2, 3, 5, 8],
-    },
-    16: {
-        front: [5, 10, 8, 11, 3, 16, 2, 13],
-        back: [1, 14, 4, 15, 7, 12, 6, 9],
-        rotate: [9, 6, 12, 7, 15, 4, 14, 1],
-    },
-    32: {
-        front: [8, 5, 10, 11, 27, 26, 21, 24, 32, 29, 18, 19, 3, 2, 13, 16],
-        back: [4, 1, 14, 15, 31, 30, 17, 20, 28, 25, 22, 23, 7, 6, 9, 12],
-        rotate: [12, 9, 6, 7, 23, 22, 25, 28, 20, 17, 30, 31, 15, 14, 1, 4],
-    },
-};

src/constants.test.js

@@ -4,34 +4,11 @@
 
 import { expect, describe, it } from 'vitest';
 
-import { PERFECTBOUND_LAYOUTS, BOOKLET_LAYOUTS, PAGE_LAYOUTS } from './constants';
+import { BOOKLET_LAYOUTS, PAGE_LAYOUTS } from './constants';
 
 function numSort(a, b) {
     return a - b;
   }
-
-
-describe('Tests of the perfectbound layout constants', () => {
-    Object.keys(PERFECTBOUND_LAYOUTS).forEach( (key) => {
-        const {front, back, rotate} = PERFECTBOUND_LAYOUTS[key];
-        it(`has the same pages on the back regardless of rotation for ${key}-per-sheet layouts`, () => {
-            const back_sorted = back.sort(numSort);
-            const back_rotated = rotate.sort(numSort);
-            expect(back_sorted).toEqual(back_rotated);
-
-        });
-
-        it(`accounts for all pages in ${key}-per-sheet layouts`, () => {
-            let both = front.concat(back);
-            both.sort(numSort);
-            const expected = Array.from({length: key}, (x, i) => i + 1);
-            expect(both).toEqual(expected);
-
-        });
-});
-
-});
-
 
 describe('Tests of the booklet layout constants', () => {
     Object.keys(BOOKLET_LAYOUTS).forEach( (key) => {
@@ -80,4 +57,4 @@ describe('Tests of the page layout constants', () => {
         });
 });
 
-});
+});