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Gruntで複数のJSONファイルを結合する

Last updated at Posted at 2016-01-15

JSONファイルが長くなると管理が難しくなるので、個別のJSONファイルを更新して
Gruntで結合することにした。

結合前

file
project
 ├ app
 ├ json-src
  ├ book-1.json
  ├ book-2.json
  └ option.json

book-1.json

json
{
  "title": "Title-1",
  "auther": "auther1",
  "description": "Title-1 description"
}

book-2.json

json
{
  "title": "Title-2",
  "auther": "auther2",
  "description": "Title-2 description"
}

option.json

json
{
  option:{
    info1: "...",  
    info2: "..."  
  }
}

結合後のイメージ

file
project
 ├ app
 ├ book-all.json ← コレ!
 ├ json-src
  ├ book-1.json
  ├ book-2.json
  └ option.json

book-all.json

json
{
  book:[
    {
      "title": "Title-1",
      "auther": "auther1",
      "description": "Title-1 description"
    },
    {
      "title": "Title-2",
      "auther": "auther2",
      "description": "Title-2 description"
    }
  ],
  option:{
    info1: "...",  
    info2: "..."  
  }
}

grunt.js

var fs = require('fs');

grunt.task.registerTask( 'build-json' , '' , function(){

	console.log('\n\n\n- - - - JSON連結開始 - - - - -\n\n');

	// 結合用データ
	var resultObj = {
		book:[],
		option:{}
	};

	// 対象フォルダ「./app/json-src/」
	grunt.file.recurse('./app/json-src/', process );

	// 対象フォルダに対し、再帰的処理
	function process(abspath, rootdir, subdir, filename){

		// 処理対象はJSONファイルに限定
		// option.jsonは別処理したいのでここで除外
		if( filename.indexOf('book') > -1 && filename.indexOf('.json') > -1 ){
			// JSONの読み込み
			var bookObj = JSON.parse(fs.readFileSync( abspath , 'utf8'));
			resultObj.book.push( bookObj );
		}

	}

	// 残りのoption.jsonを統合
	var optionObj = JSON.parse(fs.readFileSync( './app/json-src/option.json' , 'utf8'));
	resultObj.option = resultObj;

	console.log('結果検証:', resultObj );

	// String化してファイルに書き込む
	// stringifyの第2,3引数をこういうふうに書くと整形されたJSONにしてくれる。すばらしい。
	grunt.file.write( './app/book-all.json' , JSON.stringify(resultObj,null,'    ') );

});

実行
grunt build-js

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