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「プログラマが知るべき97のこと」をクローリングしてPDFを作る

Last updated at Posted at 2018-10-31

はじめに

プログラマが知るべき97のこと」というエッセイ集がWeb上で公開されていたのでクローリングしてPDF化してみました。

プロジェクトの作成

今回はクローリングスクリプトではScrapyを使用し、PDF化スクリプトではreportlabを使用します。

$ mkdir ninety_seven_things
$ cd ninety_seven_things
$ pipenv install scrapy reportlab

クローリングスクリプト

crawler.py
from scrapy import Spider, Request
from functools import reduce
from operator import add

class NinetySevenThingsSpider(Spider):
    name = 'ninety_seven_things_spider'

    # クローリングを開始するURL
    start_urls = ['https://xn--97-273ae6a4irb6e2hsoiozc2g4b8082p.com/']

    custom_settings = {
        "DOWNLOAD_DELAY": 3, # ページ遷移間隔(秒)
        "FEED_EXPORT_ENCODING": 'utf-8', # エンコード指定
    }

    def parse(self, response):
        url_obj = response.xpath('/html/body/div/div/div/div/ol//li//a/@href')
        full_urls = map(lambda href: response.urljoin(href.extract()), url_obj)
        for full_url in full_urls:
            yield Request(full_url, callback=self.output)
            
    def output(self, response):
        title = response.xpath('/html/body/div/div/article/h1/text()').extract_first()
        author = response.xpath('/html/body/div/div/article/span/a/text()').extract_first()
        body = reduce(add, map(lambda x: x.extract() + '\n', response.css('p::text')[:-3]))
        yield {
            'title': title,
            'author': author,
            'body': body.replace('', '\n')
        }

クローリング

$ pipenv run scrapy runspider crawler.py -o output.json

PDF作成スクリプト

pdf.py
from reportlab.lib.pagesizes import A4
from reportlab.pdfbase import pdfmetrics
from reportlab.pdfbase.cidfonts import UnicodeCIDFont
from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, PageBreak
from reportlab.lib.styles import getSampleStyleSheet
import json
from functools import reduce

FILENAME = 'プログラマが知るべき97のこと.pdf'
pdfmetrics.registerFont(UnicodeCIDFont('HeiseiKakuGo-W5'))
styles=getSampleStyleSheet()
styles["Normal"].fontName = 'HeiseiKakuGo-W5'

doc = SimpleDocTemplate(FILENAME,pagisize=A4)

with open('output.json', 'r') as f:
    texts = json.loads(f.read())
    story = reduce(lambda x, y: x + y, map(lambda text: [
        Paragraph('<font size=18>' + text['title'] + '</font>', styles["Normal"]),
        Spacer(1, 18),
        Paragraph('<font size=12> 著者: ' + text['author'] + '</font>', styles["Normal"]),
        Spacer(1, 12),
        Paragraph('<font size=10>' + text['body'] + '</font>', styles["Normal"]),
        PageBreak()
    ], texts))

    doc.build(story)

PDF作成

$ pipenv run python pdf.py

おわり

出典

プログラマが知るべき97のこと
CC-by-3.0-USでライセンスされているようです。

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