changelog auto update

gulpfile.js

 #!/usr/bin/env node
 
 'use strict';
-var gulp = require('gulp');
+var { task } = require('gulp');
+var fs = require('fs');
 var exec = require('child_process').exec;
+const util = require('util');
+const promisifyExec = util.promisify(require('child_process').exec);
 
 var packageJSON = require('./package.json');
 
-gulp.task('publishTag', function () {
+task('publishTag', function () {
     exec("git tag v"+ packageJSON.version +"; git push --tags");
 });
+
+task('updateChangelog', async function update() {
+    let previous_version = process.argv[4];
+    let next_version = packageJSON.version;
+    await promisifyExec("github-changes -o ethereum -r remix -a --file changes.md --only-pulls --use-commit-body --only-merges --between-tags " + previous_version + "..." + next_version);
+    let data = fs.readFileSync(__dirname + '/changes.md', 'utf8') + '\n\n' + fs.readFileSync(__dirname + '/CHANGELOG.md', 'utf8')
+    fs.unlinkSync(__dirname + '/CHANGELOG.md');
+    fs.unlinkSync(__dirname + '/changes.md');
+    fs.writeFileSync(__dirname + '/CHANGELOG.md', data); 
+    await Promise.resolve();
+});
\ No newline at end of file

package.json

 {
   "version": "0.1.21",
   "devDependencies": {
-    "gulp": "^3.9.1",
+    "gulp": "^4.0.2",
     "lerna": "^2.10.2"
   },
   "scripts": {
@@ -11,6 +11,7 @@
     "publish": "lerna publish",
     "release": "lerna bootstrap; lerna publish;",
     "tag": "gulp; gulp publishTag;",
+    "updateChangelog": "gulp; gulp updateChangelog --prev $previousVersion;",
     "remove-all-install": "npm run remove-install; npm run remove-install-analyzer; npm run remove-install-astwalker; npm run remove-install-debug; npm run remove-install-lib; npm run remove-install-simulator; npm run remove-install-tests; npm run remove-install-url-resolver; npm run remove-install-remixd; npm run remove-install-solidity;",
     "remove-install": "rm package-lock.json; rm -rf node_modules",
     "remove-install-analyzer": "rm remix-analyzer/package-lock.json; rm -rf remix-analyzer/node_modules",

release-process.md

@@ -2,24 +2,25 @@
 This document details steps for publishing packages and tag the code base accordingly:
 
 
-1) publish (using lerna) all the modules that depends on one of the newly published module:
+1) Publish (using lerna) all the modules that depends on one of the newly published module
 
 - checkout a new branch from master
 - npm run publish (that command use lerna)
 - commit
 
-2) increment the root (repository scoped) package.json
+2) Increment the root (repository scoped) package.json
 
 - increment root package.json version
 - commit
 - merge the branch
 
-3) create a tag (using the package.json version)
+3) Create a tag (using the package.json version)
 
 - checkout latest origin/master
 - npm run tag
-- github-changes -o ethereum -r remix -a --only-pulls --use-commit-body --only-merges --between-tags previous_version...next_version 
-- create a new release out of the changelog.md
-- in changelog put list of published packages with version
+- previousVersion=[previous_version] npm run updateChangelog 
+- create a new release out of the changes of CHANGELOG.md
+
+4) Commit new updated CHANGELOG.md