posthistory2kakikomi

// post_history.db to kakikomi.txt

const iconv = require("iconv-lite")
const fs = require('fs')
let filename = 'post_history.db'
const KAKIKOMI_FORMAT = `--------------------------------------------
Date   : %{date}%
Subject: %{title}%
URL    : %{url}%
FROM   : %{name}%
MAIL   : %{mail}%

%{body}%


`
let buf = [];

(async () => {
  const data = await fs.promises.readFile(filename, "utf8")
  for (let line of data.split(/\n/)) {
    try {
      let j = JSON.parse(line)
      if (!j.timestamp) throw 'invalid date'
      if (j.type === 'myself') {
        let txt = KAKIKOMI_FORMAT
        let date = new Date(j.timestamp)
        let dateStr = new Intl.DateTimeFormat('jp', {
          year: '2-digit', month: '2-digit', day: '2-digit',
          hour: '2-digit',
          minute: '2-digit',
          second: '2-digit'
        }).format(date)
        txt = txt.replace(/%\{date\}%/, dateStr)
        txt = txt.replace(/%\{title\}%/, j.title)
        txt = txt.replace(/%\{url\}%/, j.location)
        txt = txt.replace(/%\{name\}%/, j.mname ?? '')
        txt = txt.replace(/%\{mail\}%/, j.mail ?? '')
        txt = txt.replace(/%\{body\}%/, j.body)
        txt = txt.replace(/\n/g, '\x0d\x0a')
        buf.push([j.timestamp, txt])
      }
    } catch (e) {
      console.log(e)
      console.log(line)
    }
  }
  if (buf.length) {
    await fs.promises.writeFile('kakikomi.txt', iconv.encode(buf.sort((a, b) => a[0] > b[0] ? 1 : -1).map(x => x[1]).join(`\x0d\x0a`), 'cp932'), 'binary')
  }
})()