alterJsonAction.js

const fs = require("fs");

module.exports = (args) => {
	return (data) => {
		let json = null;

		// Include the JSON, throw a log and exit if it wasn't JSON / bad path.
		try {
			json = require(args.path);
			if (!json || json.constructor != Object) {
				throw new Error(`Alter JSON - Invalid / non-JSON at ${args.path}`);
			}
		}
		catch (err) {
			console.log(err.message);
			return;
		}

		// Run their alter function, try to JSONify the results.
		const alterResults = args.alter(json, data);
		const newJson = JSON.stringify(alterResults, null, args.indentation || 2);

		// Save their altered JSON, if it's kosher.
		if (newJson) {
			try {
				fs.writeFileSync(args.path, `${newJson}\r\n`);
				return true;
			}
			catch(err) {
				console.log(`Alter JSON - File save error: ${err}`);
				return;
			}
		}
		else {
			console.log(`Alter JSON - Invalid JSON returned, ${args.path} not saved`);
			return;
		}
	}
}