import gulp from 'gulp';

// function wrapper
import watchAndTouch from 'gulp-watch-and-touch';  

/**
 * give your gulp to it
 * and get function with its closure
 * @const {Function}
 * @param {string} uniqueKey
 * @param {string|Array} touchSrc
 * @param {string|Array} watchingSrc
 * @return {boolean}
 */
const wnt1 = watchAndTouch(gulp); 

/**
 * give your gulp to it
 * and get function with its closure
 * @const {Function}
 * @param {string} uniqueKey
 * @param {string|Array} touchSrc
 * @param {string|Array} watchingSrc
 * @return {boolean}
 */
const wnt2 = watchAndTouch(gulp);

// plugin which can give your
// callback with information
// about the included files there
import renderPlugin from 'some-gulp-plugin'; 

export function renderTask1 () {
    return gulp.src('sources-1/*.file') // yes that's all source you need ))
        .pipe(renderPlugin({
            option1: 'value1',
            option2: 'value2',
            afterRenderCallback: function(file, result, stats) {
                let includedSources = stats.includedFiles;
                let pathToCurrentFile = file.path;
                let uniqFileKey = pathToCurrentFile.replace(/\\|\/|\.|\s|/g, '_');

                let isChanged = wnt1(uniqFileKey, pathToCurrentFile, includedSources);
                if (isChanged) { // an example
                    console.log( `${ file.relative } change dependencies:\n${ includedSources.join('\n') }` );
                }
            }
        }))
}

// or
// ==============

const analyseFn = () => {
    // some actions that you know how to write
    // for analyse your files for getting information
    // about the included files there
    // on done call
    wnt2(uniqueKey, touchSrc, watchingSrc); 
};