mp-files

This is a file content manipulation helper, originally intended to be used in automated source code files manipulation tools.

Installation

Using npm :

npm install mp-files --save

or using yarn :

yarn add mp-files

Usage

Opening a file

const mpFiles = require("mp-files");

const filePromise = mpFiles("/my/file.txt");
filePromise.then(function(file) {
    console.log(require("util").inspect(file));
    /* 
        Here you should see something like this (depending on the file content) :
        
        File {
          path: '/my/file.txt',
          code: 'FooBar\n',
          originalCode: 'FooBar\n',
          save: [Function],
          getDiff: [Function] }
    */
});

Getting a universal diff

const mpFiles = require("mp-files");

const filePromise = mpFiles("/my/file.txt");
const diffPromise = filePromise.then(function(file) {
    console.log(file.code); // Shows the file content
    file.code += "\nNew file content\n";
    return file.getDiff(); // Diffs original versus current file code.
});

diffPromise.then(function(diff) {
    console.log(diff); 
    /* 
        Here you should see something like this :
        
        --- /my/file.txt            	1970-01-01 01:00:00.000000000 +0100
        +++ /tmp/tmp-19013mZ6Q40sOPggy	2017-01-17 13:10:01.148009597 +0100
        @@ -1,1 +1 @@
        +New file content
    */
});

Saving a file

const mpFiles = require("mp-files");

const filePromise = mpFiles("/my/file.txt");

const fileSavePromise = filePromise.then(function(file) {
    file.code = "New content";

    return file.save();
});

fileSavePromise.then(function() {
    // Here /my/file.txt contains "New content".
});