Integrating GULP with node.js - node.js

Question

I have a project in node.js for which I want to automate some backup and revision tasks in GULP.
I am able to successfully test following gulp code in terminal and everything working perfectly. The issue comes when I run gulp task from node.js code.
Gulp code:
var gulp = require('gulp');
var runSequence = require('run-sequence');
var rev = require('gulp-rev');
var format = require('date-format');
var dt = (new Date());
var gBkup = __dirname + '/backup/' + format.asString('ddMMyyyy_hhmm', dt);
var config = __dirname + '/gHelper.json', mnf = __dirname + '/rev-manifest.json';
var cssSrc = [], cssSrcO = [], cssSrcI = [];
var dirSrc = [], dirSrcO = [], dirSrcI = [];
gulp.task('init', function (){ // Initialize paths and all arrays containing file paths
var fexists = require('file-exists');
//console.log('Config exists: ' + fexists(config));
if (fexists(config)) {
config = require(config);
}
//console.log('Config object: ' + config);
if (fexists(mnf)) {
mnf = require(mnf);
}
for (var file in config.revision.ext_css) {
var fnm = __dirname + '/preview/' + config.revision.ext_css[file];
cssSrc.push(fnm);
if (mnf[config.revision.ext_css[file]] != "") {
var hnm = __dirname + '/live/' + mnf[config.revision.ext_css[file]];
cssSrcO.push(hnm);
console.log("Manifest: " + hnm);
}
}
for (var dir in config.revision.dir) {
dirSrc.push(__dirname + '/preview/' + config.revision.dir[dir]);
var dirnm = __dirname + '/live/' + config.revision.dir[dir];
dirnm = dirnm.substr(0, dirnm.length-3);
dirSrcO.push(dirnm);
console.log("Directory: " + dirnm);
}
// Files and directories will be ignored in revision
for (var file in config.revision.ext_css) {
cssSrcI.push('!' + __dirname + '/preview/' + config.revision.ext_css[file]);
}
for (var dir in config.revision.dir) {
dirSrcI.push('!' + __dirname + './preview/' + config.revision.dir[dir]);
}
//console.log('Ignore CSS: ' + cssSrcI);
//console.log('Ignore DIR: ' + dirSrcI);
});
// Revisioning Files
gulp.task('revisionCSS', function() { // Revise CSS scripts
var cssDest = __dirname + config.revision.ext_css_dest;
console.log('cssDestination: ' + cssDest);
return gulp.src(cssSrc)
.pipe(rev())
.pipe(gulp.dest(cssDest))
.pipe(rev.manifest({base: cssDest, merge: true}))
.pipe(gulp.dest(cssDest))
});
gulp.task('revInnerScripts', function () { // Revise javascripts
var dirDest = __dirname + config.revision.ext_dir_dest;
var cssDest = __dirname + config.revision.ext_css_dest;
console.log('dirInner: ' + dirDest);
console.log('cssInner: ' + cssDest);
return gulp.src(dirSrc)
.pipe(rev())
.pipe(gulp.dest(dirDest))
.pipe(rev.manifest({base: cssDest, merge: true}))
.pipe(gulp.dest(cssDest));
});
gulp.task('copyIgnoreRevision', function() { // Simply copy other/ignored files from array
var src = [__dirname + '/preview/**']
src = src.concat(cssSrcI);
src = src.concat(dirSrcI);
console.log(src)
return gulp.src(src)
.pipe(gulp.dest(__dirname + '/live'));
});
gulp.task('removeLive', function(callback) { // Removing files
var del = require('del');
var src = cssSrcO.concat(dirSrcO);
console.log("Removing Files: " + src);
return del(src);
});
gulp.task('backupLive', function() { // Backing up revision files before taking revision
// var src = ['./Live/**'];
gulp.src(cssSrcO).pipe(gulp.dest(gBkup));
return gulp.src(dirSrcO).pipe(gulp.dest(gBkup + "/js"));;
/* return gulp.src(cssSrcO, {read: false})
.pipe(clean());*/
});
gulp.task('backup', function(callback) { // Backup tasks list
runSequence('backupLive', 'removeLive', callback);
});
gulp.task('revise', ['copyIgnoreRevision', 'revisionCSS', 'revInnerScripts']);
gulp.task('revback', function (callback) {
runSequence('init', 'backup', 'revreplace', callback);
});
// Replacing references
gulp.task('revreplace', ['revise'], function(callback) { // In callback replace references for revised files
var revReplace = require('gulp-rev-replace');
var mReps = gulp.src(__dirname + '/rev-manifest.json');
return gulp.src(__dirname + '/preview/*.html')
.pipe(revReplace({manifest: mReps}))
.pipe(gulp.dest(__dirname + '/live'));
});
gHelper.json: Listing files which needs to be revised. Everything else will be copied to destination directory.
{
"revision": {
"ext_css" : [
"extie.css",
"responsive.css",
"style.css"
],
"ext_css_dest": "/live",
"dir": [
"js/*.js"
],
"ext_dir_dest": "/live/js"
}
}
Basic folder structure:
MainFolder/
gHelper.json
gulpfile.js
preview/
HTML files which contains references to revision files
Revision files (CSS and JS). CSS files are mentioned in gHelper.json
js/
Revision files (mainly js) which are to be revised as this folder is mentioned in gHelper.json and all files from the folder will be revised
When gulp task revback is invoked a folder live will be generated and added inside MainFolder. Again when revback is invoked, first, backup/{timestamp} folder will be generated taking backup of revised files only and then revision is made for live folder.
Lets see code from Node.js:
/* Publish client */
var gulp = require('gulp');
router.post('/api/:clientName/publish', function(req, res, next) {
var clientName = req.params.clientName;
var filePath = '/gulpfile'; // Full path for gulp file
console.log("Publish client: " + filePath);
try {
var gtask = require(filePath);
if (gulp.tasks.revback) {
console.log('gulp file contains task!');
gulp.start('revback');
}
} catch (err) {
return console.error(err);
}
});
Now the problem comes that sometimes gulp tasks are not being completed, rev-manifest.json is not created at proper position means inside MainFolder but created outside in the folder where this node.js lies.
Please let me know how to resolve the issue, Thanks.
Below is content of rev-manifest.json:
{
"dctConf.js": "dctConf-7c467cb7cb.js",
"extie.css": "extie-a8724bfb0c.css",
"responsive.css": "responsive-76492b9ad4.css",
"style.css": "style-770db73beb.css",
"translation.js": "translation-9687245bfb.js"
}

Answer 1

You could try changing the working directory in your gulpfile.js to the location of the gulpfile. Just add this at the top
process.chdir(__dirname);
Docs
https://nodejs.org/docs/latest/api/process.html#process_process_chdir_directory
https://nodejs.org/docs/latest/api/globals.html#globals_dirname

Answer 2

I have used gulp's native callbacks and removed run-sequence module.
E.g.:
gulp.task('revback', ['revise'], function(callback) {
var revReplace = require('gulp-rev-replace');
var mReps = gulp.src(__dirname + '/rev-manifest.json');
console.log('Manifest content: ' + mReps + ' && ' + __dirname + '/rev-manifest.json');
return gulp.src(__dirname + '/preview/*.html')
.pipe(revReplace({manifest: mReps}))
.pipe(gulp.dest(__dirname + '/live'))
.once('error', function(e) {
console.log('Error at revback: ' + e);
callback(e);
process.exit(1);
})
.once('end', function() {
console.log('Ending process at revback!');
callback();
process.exit();
});
});
gulp.task('revise', ['copyIgnoreRevision', 'revisionCSS', 'revInnerScripts']);
gulp.task('backupLive', ['init'], function() {
// var src = ['./Live/**'];
gulp.src(cssSrcO).pipe(gulp.dest(gBkup));
return gulp.src(dirSrcO).pipe(gulp.dest(gBkup + "/js"));
/* return gulp.src(cssSrcO, {read: false})
.pipe(clean());*/
});
This way, reverse chained to init function.