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pdftools.py
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pdftools.py
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import os
from typing import List
import fpdf
import PyPDF2
from natsort import natsorted
from reportlab.graphics import renderPDF
from svglib.svglib import svg2rlg
__all__ = ["interlace", "interlace_per_dir", "merge", "merge_per_dir", "write_images", "merge_svgs_per_dir"]
def interlace(front_name: str, back_name: str, out_name: str):
pdf_front = open(front_name, 'rb')
pdf_back = open(back_name, 'rb')
reader_front = PyPDF2.PdfReader(pdf_front)
reader_back = PyPDF2.PdfReader(pdf_back)
writer = PyPDF2.PdfWriter()
num_pages = len(reader_front.pages)
if not num_pages == len(reader_back.pages):
return
for i in range(0, num_pages):
print(i, num_pages, num_pages - i)
writer.add_page(reader_front.pages[i])
writer.add_page(reader_back.pages[num_pages - 1 - i])
with open(out_name, "wb") as pdf_out:
writer.write(pdf_out)
pdf_front.close()
pdf_back.close()
def interlace_per_dir(in_dir: str, out_dir: str):
for (dirpath, dirnames, filenames) in os.walk(in_dir):
for front_name, back_name in list(_group(filenames, 2)):
out_name = os.path.join(out_dir, front_name + "_interlaced.pdf")
front_name = os.path.join(in_dir, front_name)
back_name = os.path.join(in_dir, back_name)
interlace(front_name, back_name, out_name)
def merge2(filenames: List[str], output: str):
merger = PyPDF2.PdfMerger()
pdfs = []
for filename in filenames:
pdf = open(filename, 'rb')
merger.append(pdf)
with open(output, 'wb') as pdf_out:
merger.write(pdf_out)
for pdf in pdfs:
pdf.close()
def merge(filenames: List[str], output: str):
writer = PyPDF2.PdfWriter()
pdfs = []
for filename in filenames:
pdf = open(filename, 'rb')
reader = PyPDF2.PdfReader(pdf)
for i in range(0, len(reader.pages)):
writer.add_page(reader.pages[i])
pdfs.append(pdf)
with open(output, "wb") as pdf_out:
writer.write(pdf_out)
for pdf in pdfs:
pdf.close()
def merge_many_pages(filename: str, output: str, page_multiplier: int):
writer = PyPDF2.PdfWriter()
pdf = open(filename, 'rb')
reader = PyPDF2.PdfReader(pdf)
for j in range(0, page_multiplier):
for i in range(0, len(reader.pages)):
writer.add_page(reader.pages[i])
with open(output, "wb") as pdf_out:
writer.write(pdf_out)
pdf.close()
def merge_per_dir(in_dir: str, out_dir: str):
counter = 0
for (dirpath, dirnames, filenames) in os.walk(in_dir):
out_name = os.path.join(out_dir, "merged_%03d.pdf" % counter)
filenames = [os.path.join(dirpath, filename) for filename in filenames]
merge(filenames, out_name)
counter += 1
def write_images(images: List[str], output: str):
pdf = fpdf.FPDF()
for image in images:
pdf.add_page()
pdf.image(image)
pdf.output(output + ".pdf", "F")
def _group(lst, n):
"""group([0,3,4,10,2,3], 2) => [(0,3), (4,10), (2,3)]
Group a list into consecutive n-tuples. Incomplete tuples are
discarded e.g.
group(range(10), 3)
[(0, 1, 2), (3, 4, 5), (6, 7, 8)]
"""
return zip(*[lst[i::n] for i in range(n)])
def merge_svgs_per_dir(in_dir="", out_dir=""):
if not in_dir:
in_dir = os.getcwd()
if not out_dir:
out_dir = os.getcwd()
for (dirpath, dirnames, filenames) in os.walk(in_dir):
basename = os.path.basename(dirpath)
if basename.startswith("."):
continue
out_name = os.path.join(out_dir, basename + ".pdf")
filenames = [os.path.join(dirpath, filename) for filename in filenames if ".svg" in filename]
filenames = natsorted(filenames)
if len(filenames) == 0:
continue
pdf_filenames = [convert_svg(filename) for filename in filenames]
print(pdf_filenames)
merge(pdf_filenames, out_name)
def convert_svg(filename: str) -> str:
drawing = svg2rlg(filename)
pdf_name = filename.replace(".svg", ".pdf")
renderPDF.drawToFile(drawing, pdf_name)
return pdf_name
def replace_last_page(filename: str, lastpage: str, offset: int = 0):
'''
offset: if last page is not at the end
'''
pdf_front = open(filename, 'rb')
pdf_back = open(lastpage, 'rb')
reader_front = PyPDF2.PdfReader(pdf_front)
reader_back = PyPDF2.PdfReader(pdf_back)
writer = PyPDF2.PdfWriter()
num_pages = len(reader_front.pages)
for i in range(0, num_pages - 1 - offset):
print(i, num_pages, num_pages - i)
writer.add_page(reader_front.pages[i])
writer.add_page(reader_back.pages[0])
for i in range(num_pages - offset, num_pages):
print(i, num_pages, num_pages - i)
writer.add_page(reader_front.pages[i])
with open(filename.replace(".pdf", "_merged.pdf"), "wb") as pdf_out:
writer.write(pdf_out)
pdf_front.close()
pdf_back.close()