5 from reportlab.lib.pagesizes import A4
6 a4_width, a4_height = A4
8 parser = argparse.ArgumentParser(description="build print-ready book PDF")
9 parser.add_argument("-i", "--input", dest="input_file", required=True, help="input PDF file")
10 parser.add_argument("-o", "--output", dest="output_file", required=True, help="output PDF file")
11 parser.add_argument("-p", "--pages", dest="page_range", help="page range, e.g., '3-end'")
12 parser.add_argument("-c", "--crop", dest="crop_range", help="crops left, bottom, right, top – e.g., '10,10,10,10'")
13 parser.add_argument("-n", "--nup4", dest="nup4", action='store_true', help="puts 4 input pages onto 1 output page")
14 parser.add_argument("-a", "--analyze", dest="analyze", action="store_true", help="print lines identifying spine, page borders")
15 parser.add_argument("-t", "--symmetry", dest="symmetry", action="store_true", help="alternate horizontal crops between odd and even pages")
16 parser.add_argument("-s", "--second", dest="second", help="append second file as input to append")
17 args = parser.parse_args()
19 with open(args.input_file, 'rb') as file:
20 reader = pypdf.PdfReader(file)
22 # determine page range
24 end_page = len(reader.pages)
26 start, end = args.page_range.split('-')
27 if not (len(start) == 0 or start == "start"):
28 start_page = int(start) - 1
29 if not (len(end) == 0 or end == "end"):
32 for page_num in range(start_page, end_page):
33 page = reader.pages[page_num]
34 pages_to_add += [page]
35 print("read in page number", page_num+1)
37 # add pages of second PDF
39 file2 = open(args.second, 'rb')
40 reader2 = pypdf.PdfReader(file2)
42 for page in reader2.pages:
43 pages_to_add += [page]
44 print("read second PDF's page number", page_num)
47 # normalize all pages to A4
48 for page in pages_to_add:
49 page.mediabox.left = 0
50 page.mediabox.bottom = 0
51 page.mediabox.top = a4_height
52 page.mediabox.right = a4_width
53 page.cropbox = page.mediabox
56 crop_left, crop_bottom, crop_right, crop_top = 0, 0, 0, 0
58 crop_left, crop_bottom, crop_right, crop_top = [float(x) for x in args.crop_range.split(',')]
59 cropped_width = a4_width - crop_left - crop_right
60 cropped_height = a4_height - crop_bottom - crop_top
63 zoom_horizontal = a4_width / (a4_width - crop_left - crop_right)
64 zoom_vertical = a4_height / (a4_height - crop_bottom - crop_top)
65 if (zoom_horizontal > 1 and zoom_vertical < 1) or (zoom_horizontal < 1 and zoom_vertical > 1):
66 print("Error: opposing zooms.")
68 elif zoom_horizontal + zoom_vertical > 2:
69 zoom = min(zoom_horizontal, zoom_vertical)
71 zoom = max(zoom_horizontal, zoom_vertical)
73 writer = pypdf.PdfWriter()
76 for page in pages_to_add:
77 if args.symmetry and odd_page:
78 page.add_transformation(pypdf.Transformation().translate(tx=-crop_left, ty=-crop_bottom))
80 page.add_transformation(pypdf.Transformation().translate(tx=-crop_right, ty=-crop_bottom))
81 page.add_transformation(pypdf.Transformation().scale(zoom, zoom))
82 page.mediabox.right = cropped_width * zoom
83 page.mediabox.top = cropped_height * zoom
85 odd_page = not odd_page
88 points_per_mm = 2.83465
89 printable_margin = 4.3 * points_per_mm
90 printable_scale = (a4_width - 2*printable_margin)/a4_width
91 spine_limit = 10 * points_per_mm
92 half_width = a4_width / n_pages_per_axis
93 half_height = a4_height / n_pages_per_axis
94 section_scale_factor = 1 / n_pages_per_axis
95 spine_part_of_page = (spine_limit / half_width) / printable_scale
96 bonus_shrink_factor = 1 - spine_part_of_page
99 mod_to_8 = len(pages_to_add) % 8
101 for _ in range(8 - mod_to_8):
102 new_page = pypdf.PageObject.create_blank_page(width=a4_width, height=a4_height)
103 pages_to_add += [new_page]
105 for page in pages_to_add:
112 new_page_order += [eight_pack[3]] # page front, upper left
113 new_page_order += [eight_pack[0]] # page front, upper right
114 new_page_order += [eight_pack[7]] # page front, lower left
115 new_page_order += [eight_pack[4]] # page front, lower right
116 new_page_order += [eight_pack[1]] # page back, upper left
117 new_page_order += [eight_pack[2]] # page back, upper right
118 new_page_order += [eight_pack[5]] # page back, lower left
119 new_page_order += [eight_pack[6]] # page back, lower right
123 for page in new_page_order:
125 new_page = pypdf.PageObject.create_blank_page(width=a4_width, height=a4_height)
127 # in-section transformations: align pages on top, left-hand pages to left, right-hand to right
128 page.add_transformation(pypdf.Transformation().translate(ty=(a4_height / zoom - (a4_height - crop_top))))
131 page.add_transformation(pypdf.Transformation().translate(tx=-crop_right))
133 page.add_transformation(pypdf.Transformation().translate(tx=-crop_left))
134 elif i == 1 or i == 3:
135 page.add_transformation(pypdf.Transformation().translate(tx=(a4_width / zoom - (a4_width - crop_right))))
136 page.add_transformation(pypdf.Transformation().scale(zoom * bonus_shrink_factor, zoom * bonus_shrink_factor))
138 page.add_transformation(pypdf.Transformation().translate(ty=-2*printable_margin/printable_scale))
140 # outer section transformations
141 page.add_transformation(pypdf.Transformation().translate(ty=(1-bonus_shrink_factor)*a4_height))
143 y_section = a4_height
144 page.mediabox.bottom = half_height
145 page.mediabox.top = a4_height
148 page.mediabox.bottom = 0
149 page.mediabox.top = half_height
152 page.mediabox.left = 0
153 page.mediabox.right = half_width
155 page.add_transformation(pypdf.Transformation().translate(tx=(1-bonus_shrink_factor)*a4_width))
157 page.mediabox.left = half_width
158 page.mediabox.right = a4_width
159 page.add_transformation(pypdf.Transformation().translate(tx=x_section, ty=y_section))
160 page.add_transformation(pypdf.Transformation().scale(section_scale_factor, section_scale_factor))
161 new_page.merge_page(page)
163 print("merged page number", page_count)
166 from reportlab.pdfgen import canvas
169 packet = io.BytesIO()
170 c = canvas.Canvas(packet, pagesize=A4)
172 c.line(0, a4_height, a4_width, a4_height)
173 c.line(0, half_height, a4_width, half_height)
174 c.line(0, 0, a4_width, 0)
175 c.line(0, a4_height, 0, 0)
176 c.line(half_width, a4_height, half_width, 0)
177 c.line(a4_width, a4_height, a4_width, 0)
179 new_pdf = pypdf.PdfReader(packet)
180 new_page.merge_page(new_pdf.pages[0])
181 printable_offset_x = printable_margin
182 printable_offset_y = printable_margin * a4_height / a4_width
183 new_page.add_transformation(pypdf.Transformation().scale(printable_scale, printable_scale))
184 new_page.add_transformation(pypdf.Transformation().translate(tx=printable_offset_x, ty=printable_offset_y))
185 x_left_spine_limit = half_width * bonus_shrink_factor
186 x_right_spine_limit = a4_width - x_left_spine_limit
187 if args.analyze or front_page:
188 packet = io.BytesIO()
189 c = canvas.Canvas(packet, pagesize=A4)
193 c.line(x_left_spine_limit, a4_height, x_left_spine_limit, 0)
194 c.line(x_right_spine_limit, a4_height, x_right_spine_limit, 0)
197 cut_depth = 19.5 * points_per_mm
198 cut_width = 10.5 * points_per_mm
199 middle_point_depth = 4 * points_per_mm
201 start_up_left_left_x = x_left_spine_limit - 0.5 * cut_width
202 start_up_left_right_x = x_left_spine_limit + 0.5 * cut_width
203 middle_point_up_left_y = half_height + middle_point_depth
204 end_point_up_left_y = half_height + cut_depth
205 c.line(start_up_left_right_x, half_height, x_left_spine_limit, end_point_up_left_y)
206 c.line(x_left_spine_limit, end_point_up_left_y, x_left_spine_limit, middle_point_up_left_y)
207 c.line(x_left_spine_limit, middle_point_up_left_y, start_up_left_left_x, half_height)
209 start_down_right_left_x = x_right_spine_limit - 0.5 * cut_width
210 start_down_right_right_x = x_right_spine_limit + 0.5 * cut_width
211 middle_point_down_right_y = half_height - middle_point_depth
212 end_point_down_right_y = half_height - cut_depth
213 c.line(start_down_right_left_x, half_height, x_right_spine_limit, end_point_down_right_y)
214 c.line(x_right_spine_limit, end_point_down_right_y, x_right_spine_limit, middle_point_down_right_y)
215 c.line(x_right_spine_limit, middle_point_down_right_y, start_down_right_right_x, half_height)
217 if args.analyze or front_page:
220 new_pdf = pypdf.PdfReader(packet)
221 new_page.merge_page(new_pdf.pages[0])
222 writer.add_page(new_page)
224 front_page = not front_page
226 with open(args.output_file, 'wb') as output_file:
227 writer.write(output_file)