pip install PyPDF2 reportlab

import io
import os

from PyPDF2 import PdfReader
from PyPDF2 import PdfWriter
from reportlab.lib.pagesizes import letter
from reportlab.pdfbase.pdfmetrics import stringWidth
from reportlab.pdfgen import canvas


def create_footer_page(footer_text):
    packet = io.BytesIO()
    c = canvas.Canvas(packet, pagesize=letter)
    width, height = letter  # letter頁面的寬度和高度
    font_name = "Helvetica"  # 使用的字體
    font_size = 12  # 字體大小
    cover_height = font_size + 4  # 覆蓋區(qū)域的高度稍大于字體大小，以確保完全覆蓋原有頁碼
    cover_y_position = 28  # 覆蓋區(qū)域的Y位置，根據(jù)需要進行調(diào)整以確保覆蓋原有頁碼

    # 計算文本寬度和起始X位置以居中文本
    text_width = c.stringWidth(footer_text, font_name, font_size)
    text_start_position = (width - text_width) / 2

    # 繪制一個足夠大的白色矩形以覆蓋原有頁碼
    c.setFillColorRGB(1, 1, 1)  # 設置填充顏色為白色
    c.rect(0, cover_y_position, width, cover_height, stroke=False, fill=True)

    # 在頁腳區(qū)域居中添加文本，高度可以根據(jù)需要調(diào)整
    c.setFont(font_name, font_size)  # 設置字體和大小
    c.setFillColorRGB(0, 0, 0)  # 設置文本顏色為黑色
    c.drawString(text_start_position, 32, footer_text)  # 繪制居中的頁腳文本

    c.save()
    packet.seek(0)
    return PdfReader(packet)


def add_catalog_page(bookmarks):
    packet = io.BytesIO()
    c = canvas.Canvas(packet, pagesize=letter)
    width, height = letter
    top_margin = 60  # 頂部留白增加
    bottom_margin = 60  # 底部留白增加
    y_position = height - top_margin  # 根據(jù)頂部留白調(diào)整初始y_position
    c.setFont("Helvetica-Bold", 16)  # 設置標題的字體和大小
    c.drawString(280, y_position, "Directory")  # 在頂部繪制標題“目錄”
    y_position -= 30  # 更新y_position以為目錄項留出空間

    c.setFont("Helvetica", 12)  # 設置目錄項的字體和大小
    left_margin = 72
    right_margin = width - 72
    dot_space = 5  # 點間隔可調(diào)整
    different_title_spacing = 25  # 不同標題之間的間隔
    same_title_line_spacing = 15  # 同一個標題換行的間隔
    split_ratio = 0.9  # 定義分割點的位置比例

    for title, page_number in bookmarks:
        available_width = right_margin - left_margin - dot_space * 2  # 計算可用寬度
        title_width = stringWidth(title, "Helvetica", 12)
        page_number_str = str(page_number)
        page_number_width = stringWidth(page_number_str, "Helvetica", 12)

        # 判斷標題是否需要分割
        if title_width > available_width * split_ratio:
            # 尋找分割點
            split_title = title
            while stringWidth(split_title + "-", "Helvetica", 12) > available_width * split_ratio:
                split_title = split_title[:-1]
            split_title += "-"
            c.drawString(left_margin, y_position, split_title)
            y_position -= same_title_line_spacing  # 分割后的第二行位置向下調(diào)整，間隔小一點
            title = title[len(split_title) - 1:]

        # 繪制標題
        c.drawString(left_margin, y_position, title)

        # 繪制頁碼
        c.drawRightString(right_margin, y_position, page_number_str)

        # 繪制點線
        dot_line_start = left_margin + stringWidth(title, "Helvetica", 12) + 10
        dot_line_end = right_margin - page_number_width - 10
        current_position = dot_line_start

        while current_position < dot_line_end:
            c.drawString(current_position, y_position, ".")
            current_position += dot_space

        y_position -= different_title_spacing  # 移到下一個標題，間隔大一點
        if y_position < bottom_margin:  # 根據(jù)底部留白調(diào)整翻頁判斷
            c.showPage()
            y_position = height - top_margin  # 重置y_position時也考慮頂部留白
            c.setFont("Helvetica", 12)  # 確保新頁面開始時使用正確的字體和大小

    c.save()
    packet.seek(0)
    return PdfReader(packet)


# 讀取PDF/路徑下所有.pdf為后綴的文件
pdf_dir = '我的論文集/'
pdf_files = sorted([f for f in os.listdir(pdf_dir) if f.endswith('.pdf')])

# 找到特定文件并將其移動到列表的開頭
specific_file = "第一篇.pdf"
if specific_file in pdf_files:
    pdf_files.insert(0, pdf_files.pop(pdf_files.index(specific_file)))
    #print(pdf_files)

# 存儲所有處理后的頁面，以便后續(xù)添加頁腳
all_pages = []
bookmarks = []
total_pages = 0

# 首先處理每個PDF文件，但不立即添加頁腳
for filename in pdf_files:
    reader = PdfReader(os.path.join(pdf_dir, filename))
    bookmarks.append((filename.replace('.pdf', ''), total_pages + 1))
    for page in reader.pages:
        all_pages.append(page)
        total_pages += 1

# 創(chuàng)建目錄頁并添加到最終PDF
writer = PdfWriter()
catalog_pdf = add_catalog_page(bookmarks)
for page in catalog_pdf.pages:
    writer.add_page(page)

# 為每頁添加頁腳，并將頁面添加到最終的PDF中
current_page_number = 1  # 從目錄頁之后的第一頁開始計數(shù)頁碼
catalog_pages_count = len(catalog_pdf.pages)  # 計算目錄頁數(shù)量

for page in all_pages:
    # 不再需要在頁碼中加上目錄頁的數(shù)量
    footer_pdf = create_footer_page(f"Page number: {current_page_number}")
    page.merge_page(footer_pdf.pages[0])
    writer.add_page(page)
    current_page_number += 1

# 保存最終的PDF
output_pdf_path = "MergePapers.pdf"
with open(output_pdf_path, "wb") as f_out:
    writer.write(f_out)