## node.jsが入っていることを確認
node -v

## 作業ディレクトリ作成
mkdir imedict
mv imedict

## package.jsonを作成
npm init -y
## 依存関係のインストール
npm install --save-dev @types/node ts-node typescript

## ファイルを作成 (ファイルの内容は後述)
vim index.ts
vim dictionary.ts

## 実行
npx ts-node index.ts /path/to/my_exported_google_ime_dictionary.txt

import * as fs from "fs"
import * as path from "path"
import * as util from "util"
import { parseGoogleJapaneseImeDictionary, MacosIme, buildMacosImeDictionaryContents } from "./dictionary"

async function main() {
    // 引数からファイル名を取得
    const filepathArgument = process.argv[2]
    if (!filepathArgument) {
        throw Error('You must specify filepath to command line arguments.')
    }

    // ファイルを全て読み込む
    const filepath = path.resolve(filepathArgument)
    console.log(`Read a file:`)
    console.log(`  input from: ${filepath}`)
    const contentsBuffer = await util.promisify(fs.readFile)(filepath)
    const inputFileContents = contentsBuffer.toString('utf-8', 0, contentsBuffer.length)

    console.log(`Converting...`)
    // Google日本語入力の値をパース
    const googleJapaneseImeEntries = parseGoogleJapaneseImeDictionary(inputFileContents)
    // macOS標準辞書としてのアイテムへ変換
    const macosImeEntries = googleJapaneseImeEntries.map(o => {
        return {
            reading: o.reading,
            word: o.word,
        } as MacosIme.DictionaryItem
    })
    // ファイルに書き込む内容を作成
    const outputFileContents = buildMacosImeDictionaryContents(macosImeEntries)

    // ファイルへ書き込む
    console.log(`Write a file:`)
    const writeToFilepath = path.resolve(`${filepath}.plist`)
    console.log(`  output to: ${writeToFilepath}`)
    util.promisify(fs.writeFile)(writeToFilepath, outputFileContents)

    console.log(`Finished!`)
}

main().catch(e => {
    console.error(e)
})

export namespace GoogleJapaneseIme {
    export interface DictionaryItem {
        reading: string
        word: string
        category: string
        comment: string
    }
}

export namespace MacosIme {
    export interface DictionaryItem {
        reading: string
        word: string
    }
}

export function parseGoogleJapaneseImeDictionary(contents: string): GoogleJapaneseIme.DictionaryItem[] {
    const entries = contents.split('\n')
    return entries.filter(line => {
        // 空行はスキップする
        return line.length !== 0
    }).map(line => {
        const cells = line.split('\t')
        // Assertion
        if (cells.length !== 4) {
            throw Error(`Invalid syntax of Google Japanese InputMethod Dictionary. Please check your dictionary syntax is correct. line=${line}`)
        }
        return {
            reading: cells[0],
            word: cells[1],
            category: cells[2],
            comment: cells[3],
        } as GoogleJapaneseIme.DictionaryItem
    })
}


function escapeForXml(text: string) {
    return text.replace('<', '&lt;').replace('>', '&gt;')
}

/**
 * 数値を半角から全角にするメソッド。macOS日本語入力では、数字は全角でなければ辞書変換できない。
 */
function replaceNumbersHankakuToZenkaku(text: string) {
    return text.replace(/[0-9]/g, o => String.fromCharCode(o.charCodeAt(0) + 0xFEE0))
}

const templates = {
    main: (content: string) => {
        return `<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
${content}
</array>
</plist>
`
    },
    item: (item: MacosIme.DictionaryItem) => {
        return `\t<dict>
\t\t<key>phrase</key>
\t\t<string>${escapeForXml(item.word)}</string>
\t\t<key>shortcut</key>
\t\t<string>${escapeForXml(replaceNumbersHankakuToZenkaku(item.reading))}</string>
\t</dict>`
    }
}

export function buildMacosImeDictionaryContents(entries: MacosIme.DictionaryItem[]) {
    const xmlItems = entries.map(o => templates.item(o))
    const fileContents = templates.main(xmlItems.join('\n'))
    return fileContents
}

$ npx ts-node index.ts ./userdic.txt
Read a file:
  input from: /path/to/userdic.txt
Converting...
Write a file:
  output to: /path/to/userdic.txt.plist
Finished!

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
    <dict>
        <key>phrase</key>
        <string>✧＼\ ٩( 'ω' )و /／✧</string>
        <key>shortcut</key>
        <string>やった</string>
    </dict>
    <dict>
        <key>phrase</key>
        <string>m(_ _)m</string>
        <key>shortcut</key>
        <string>ありがとう</string>
    </dict>
    (...省略)
</array>
</plist>