feat: add clean command

added next gulp commands:
- `clean-build` - delete build folder
- `clean-release` - delete release folder
- `clean-node` - delete nodo_modules folder

added next parallel commands:
- `clear` - include: `clean-build`, `clean-release` and `clean-node`

Closes #32

Author: romanrostislavovich

.vscode/spellright.dict

@@ -23,3 +23,8 @@ md
 json
 linterhub
 init
+dist
+src
+dir
+ver
+ext

package.json

@@ -26,6 +26,7 @@
   "license": "MIT",
   "homepage": "https://schema.linterhub.com",
   "devDependencies": {
+    "del": "^3.0.0",
     "eslint": "^4.19.1",
     "eslint-config-google": "^0.9.1",
     "fancy-log": "^1.3.2",

script/gulp/config.json

@@ -40,5 +40,8 @@
     "release": {
         "dir": "dist",
         "mask": "dist/*.json"
+    },
+    "node": {
+        "dir": "node_modules"
     }
 }

script/gulp/index.js

@@ -6,8 +6,9 @@ const cfg = require('./config.json');
 // Shared node modules
 const amd = {
   fs: require('fs'),
-  log: require('fancy-log'),
+  del: require('del'),
   path: require('path'),
+  log: require('fancy-log'),
   git: require('gulp-git'),
   yaml: require('js-yaml'),
   eslint: require('gulp-eslint'),

script/gulp/task.clean.js

@@ -0,0 +1,35 @@
+'use strict';
+
+// Get shared core
+const core = global.lhcore;
+
+// External modules as aliases
+const gulp = core.amd.gulp;
+const del = core.amd.del;
+const config = core.cfg;
+
+// Cleanup build
+const cleanBuild = () => del([
+    config.build.dir,
+]);
+
+// Cleanup release
+const cleanRelease = () => del([
+    config.release.dir,
+]);
+
+// Cleanup node
+const cleanNode = () => del([
+    config.node.dir,
+]);
+
+// Tasks
+gulp.task('clean-build', cleanBuild);
+gulp.task('clean-release', cleanRelease);
+gulp.task('clean-node', cleanNode);
+
+gulp.task('clean', gulp.parallel(
+    'clean-build',
+    'clean-release',
+    'clean-node'
+));