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 parser.add_argument("-r", "--rotate", dest="rotate", help="rotate page of number by 90°")
18 parser.add_argument("-m", "--margin", type=float, default=4.3, help="print margin (default 4.3)")
19 args = parser.parse_args()
21 with open(args.input_file, 'rb') as file:
22 reader = pypdf.PdfReader(file)
24 # determine page range
26 end_page = len(reader.pages)
28 start, end = args.page_range.split('-')
29 if not (len(start) == 0 or start == "start"):
30 start_page = int(start) - 1
31 if not (len(end) == 0 or end == "end"):
34 for page_num in range(start_page, end_page):
35 page = reader.pages[page_num]
36 pages_to_add += [page]
37 print("read in page number", page_num+1)
39 # add pages of second PDF
41 file2 = open(args.second, 'rb')
42 reader2 = pypdf.PdfReader(file2)
44 for page in reader2.pages:
45 pages_to_add += [page]
46 print("read second PDF's page number", page_num)
51 page = pages_to_add[int(args.rotate) - 1]
52 page.add_transformation(pypdf.Transformation().translate(tx=-a4_width/2, ty=-a4_height/2))
53 page.add_transformation(pypdf.Transformation().rotate(-90))
54 page.add_transformation(pypdf.Transformation().translate(tx=a4_width/2, ty=a4_height/2))
56 # normalize all pages to portrait A4
57 for page in pages_to_add:
59 page.rotate(360 - page["/Rotate"])
60 page.mediabox.left = 0
61 page.mediabox.bottom = 0
62 page.mediabox.top = a4_height
63 page.mediabox.right = a4_width
64 page.cropbox = page.mediabox
67 crop_left, crop_bottom, crop_right, crop_top = 0, 0, 0, 0
69 crop_left, crop_bottom, crop_right, crop_top = [float(x) for x in args.crop_range.split(',')]
70 cropped_width = a4_width - crop_left - crop_right
71 cropped_height = a4_height - crop_bottom - crop_top
74 zoom_horizontal = a4_width / (a4_width - crop_left - crop_right)
75 zoom_vertical = a4_height / (a4_height - crop_bottom - crop_top)
76 if (zoom_horizontal > 1 and zoom_vertical < 1) or (zoom_horizontal < 1 and zoom_vertical > 1):
77 print("Error: opposing zooms.")
79 elif zoom_horizontal + zoom_vertical > 2:
80 zoom = min(zoom_horizontal, zoom_vertical)
82 zoom = max(zoom_horizontal, zoom_vertical)
84 writer = pypdf.PdfWriter()
87 for page in pages_to_add:
88 if args.symmetry and odd_page:
89 page.add_transformation(pypdf.Transformation().translate(tx=-crop_right, ty=-crop_bottom))
91 page.add_transformation(pypdf.Transformation().translate(tx=-crop_left, ty=-crop_bottom))
92 page.add_transformation(pypdf.Transformation().scale(zoom, zoom))
93 page.mediabox.right = cropped_width * zoom
94 page.mediabox.top = cropped_height * zoom
96 odd_page = not odd_page
99 points_per_mm = 2.83465
100 printable_margin = args.margin * points_per_mm
101 printable_scale = (a4_width - 2*printable_margin)/a4_width
102 spine_limit = 10 * points_per_mm
103 half_width = a4_width / n_pages_per_axis
104 half_height = a4_height / n_pages_per_axis
105 section_scale_factor = 1 / n_pages_per_axis
106 spine_part_of_page = (spine_limit / half_width) / printable_scale
107 bonus_shrink_factor = 1 - spine_part_of_page
110 mod_to_8 = len(pages_to_add) % 8
112 for _ in range(8 - mod_to_8):
113 new_page = pypdf.PageObject.create_blank_page(width=a4_width, height=a4_height)
114 pages_to_add += [new_page]
116 for page in pages_to_add:
123 new_page_order += [eight_pack[3]] # page front, upper left
124 new_page_order += [eight_pack[0]] # page front, upper right
125 new_page_order += [eight_pack[7]] # page front, lower left
126 new_page_order += [eight_pack[4]] # page front, lower right
127 new_page_order += [eight_pack[1]] # page back, upper left
128 new_page_order += [eight_pack[2]] # page back, upper right
129 new_page_order += [eight_pack[5]] # page back, lower left
130 new_page_order += [eight_pack[6]] # page back, lower right
134 for page in new_page_order:
136 new_page = pypdf.PageObject.create_blank_page(width=a4_width, height=a4_height)
138 # in-section transformations: align pages on top, left-hand pages to left, right-hand to right
139 page.add_transformation(pypdf.Transformation().translate(ty=(a4_height / zoom - (a4_height - crop_top))))
142 page.add_transformation(pypdf.Transformation().translate(tx=-crop_left))
144 page.add_transformation(pypdf.Transformation().translate(tx=-crop_right))
145 elif i == 1 or i == 3:
147 page.add_transformation(pypdf.Transformation().translate(tx=(a4_width / zoom - (a4_width - crop_left))))
149 page.add_transformation(pypdf.Transformation().translate(tx=(a4_width / zoom - (a4_width - crop_right))))
150 page.add_transformation(pypdf.Transformation().scale(zoom * bonus_shrink_factor, zoom * bonus_shrink_factor))
152 page.add_transformation(pypdf.Transformation().translate(ty=-2*printable_margin/printable_scale))
154 # outer section transformations
155 page.add_transformation(pypdf.Transformation().translate(ty=(1-bonus_shrink_factor)*a4_height))
157 y_section = a4_height
158 page.mediabox.bottom = half_height
159 page.mediabox.top = a4_height
162 page.mediabox.bottom = 0
163 page.mediabox.top = half_height
166 page.mediabox.left = 0
167 page.mediabox.right = half_width
169 page.add_transformation(pypdf.Transformation().translate(tx=(1-bonus_shrink_factor)*a4_width))
171 page.mediabox.left = half_width
172 page.mediabox.right = a4_width
173 page.add_transformation(pypdf.Transformation().translate(tx=x_section, ty=y_section))
174 page.add_transformation(pypdf.Transformation().scale(section_scale_factor, section_scale_factor))
175 new_page.merge_page(page)
177 print("merged page number", page_count)
180 from reportlab.pdfgen import canvas
183 packet = io.BytesIO()
184 c = canvas.Canvas(packet, pagesize=A4)
186 c.line(0, a4_height, a4_width, a4_height)
187 c.line(0, half_height, a4_width, half_height)
188 c.line(0, 0, a4_width, 0)
189 c.line(0, a4_height, 0, 0)
190 c.line(half_width, a4_height, half_width, 0)
191 c.line(a4_width, a4_height, a4_width, 0)
193 new_pdf = pypdf.PdfReader(packet)
194 new_page.merge_page(new_pdf.pages[0])
195 printable_offset_x = printable_margin
196 printable_offset_y = printable_margin * a4_height / a4_width
197 new_page.add_transformation(pypdf.Transformation().scale(printable_scale, printable_scale))
198 new_page.add_transformation(pypdf.Transformation().translate(tx=printable_offset_x, ty=printable_offset_y))
199 x_left_spine_limit = half_width * bonus_shrink_factor
200 x_right_spine_limit = a4_width - x_left_spine_limit
201 if args.analyze or front_page:
202 packet = io.BytesIO()
203 c = canvas.Canvas(packet, pagesize=A4)
207 c.line(x_left_spine_limit, a4_height, x_left_spine_limit, 0)
208 c.line(x_right_spine_limit, a4_height, x_right_spine_limit, 0)
211 cut_depth = 19.5 * points_per_mm
212 cut_width = 10.5 * points_per_mm
213 middle_point_depth = 4 * points_per_mm
215 start_up_left_left_x = x_left_spine_limit - 0.5 * cut_width
216 start_up_left_right_x = x_left_spine_limit + 0.5 * cut_width
217 middle_point_up_left_y = half_height + middle_point_depth
218 end_point_up_left_y = half_height + cut_depth
219 c.line(start_up_left_right_x, half_height, x_left_spine_limit, end_point_up_left_y)
220 c.line(x_left_spine_limit, end_point_up_left_y, x_left_spine_limit, middle_point_up_left_y)
221 c.line(x_left_spine_limit, middle_point_up_left_y, start_up_left_left_x, half_height)
223 start_down_right_left_x = x_right_spine_limit - 0.5 * cut_width
224 start_down_right_right_x = x_right_spine_limit + 0.5 * cut_width
225 middle_point_down_right_y = half_height - middle_point_depth
226 end_point_down_right_y = half_height - cut_depth
227 c.line(start_down_right_left_x, half_height, x_right_spine_limit, end_point_down_right_y)
228 c.line(x_right_spine_limit, end_point_down_right_y, x_right_spine_limit, middle_point_down_right_y)
229 c.line(x_right_spine_limit, middle_point_down_right_y, start_down_right_right_x, half_height)
231 if args.analyze or front_page:
234 new_pdf = pypdf.PdfReader(packet)
235 new_page.merge_page(new_pdf.pages[0])
236 writer.add_page(new_page)
238 front_page = not front_page
240 with open(args.output_file, 'wb') as output_file:
241 writer.write(output_file)