按文件名排序

# -*- coding:utf-8 -*-

import os
from pathlib import Path
import time
from threading import Thread, current_thread
from tkinter import Tk, StringVar, Frame, Label, LEFT, Entry, Button, mainloop
from PIL import Image

import click
from reportlab.pdfgen import canvas


SUCCESS_MESSAGE = '生成成功'
FILE_NOT_EXIST_MESSAGE = '文件地址不存在'
GENERATING_MESSAGE = '生成中...'


class ConvertJob(object):
    def __init__(self, dir_path):
        self.dir_path = dir_path

    @property
    def pdf_file(self):
        return os.path.join(self.dir_path, f'{time.strftime("%Y-%m-%d", time.localtime())}.pdf')

    def convert_pdf(self):
        try:
            self._convert_pdf()
        except (FileExistsError, OSError, PermissionError):
            return FILE_NOT_EXIST_MESSAGE
        except Exception as e:
            return e.args[0]
        return SUCCESS_MESSAGE

    def _convert_pdf(self):
        cv = canvas.Canvas(self.pdf_file)
        empty_flag = True
        for file_path in self.get_list_images():
            try:
                im = Image.open(file_path)
            except OSError:
                continue
            cv.setPageSize(im.size)
            cv.drawImage(file_path, 0, 0, * im.size)
            cv.showPage()
            empty_flag = False
        if not empty_flag:
            cv.save()
        else:
            raise FileExistsError

    def get_list_images(self):
        file_list = []
        if os.path.isdir(self.dir_path):
            for image_name in os.listdir(self.dir_path):
                abs_path = Path(os.path.join(self.dir_path, image_name))
                file_list.append(abs_path)
        file_list.sort(key=self.file_name_sort_key)
        return file_list

    @staticmethod
    def file_name_sort_key(file_name):
        base_file_name = file_name.name.split('.', 1)[0]
        i = -1
        for i, c in enumerate(base_file_name):
            if '0' <= c <= '9':
                continue
            break
        else:
            i += 1
        return int(base_file_name[:i]) if i else -1, base_file_name[i:]


class PdfTkinter(object):

    """
    界面
    """
    current_thread = None

    def __init__(self):
        top = Tk()
        sw = top.winfo_screenwidth()
        sh = top.winfo_screenheight()
        top_width = 500
        top_height = 200
        top.title('图片转pdf生成器')
        top.geometry(
            f"{top_width}x{top_height}+{(sw - top_width) // 2}+{(sh - top_height) // 2}"
        )

        self._dir_path = StringVar(top)

        Frame(top, height=50).pack()

        dir_frame = Frame(top)
        dir_label = Label(dir_frame, width=4, text='路径：')
        dir_label.pack(side=LEFT)
        dir_entry = Entry(dir_frame, width=50, textvariable=self._dir_path)
        dir_entry.pack(side=LEFT, padx=5)
        dir_frame.pack()

        Frame(top, height=5).pack()

        self.message_frame = Frame(top, height=30, width=50)
        self.text_area = Label(self.message_frame, text='')
        self.text_area.pack(side=LEFT, padx=60)
        self.message_frame.pack()

        Frame(top, height=5).pack()

        button_frame = Frame(top)
        convert_button = Button(
            button_frame, width=10, text='生成PDF', command=self.convert,
            activeforeground='white', activebackground='blue')
        quit_button = Button(
            button_frame, width=10, text='退出', command=top.quit, activeforeground='white',
            activebackground='blue'
        )
        convert_button.pack(side=LEFT, padx=10)
        quit_button.pack(side=LEFT, padx=10)
        button_frame.pack()

    def message(self, text, color='black'):
        self.text_area.destroy()
        self.text_area = Label(self.message_frame, text=text, fg=color)
        self.text_area.pack(side=LEFT, padx=60)

    def convert(self):
        self.message(GENERATING_MESSAGE, 'red')
        self.current_thread = Thread(target=self.convert_thread)
        self.current_thread.start()

    def convert_thread(self):
        text = ConvertJob(self._dir_path.get()).convert_pdf()
        if self.current_thread is current_thread():
            self.message(text, 'red')


@click.command()
@click.option('-d', 'dir_path', default=None, help='image document path')
def run(dir_path):
    if dir_path is None:
        PdfTkinter()
        mainloop()
    else:
        ConvertJob(dir_path).convert_pdf()


if __name__ == '__main__':
    run()