Add action to dynamically build README

Author: jung-thomas

.github/workflows/build.yml

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+name: README builder
+on:
+  workflow_dispatch:
+  schedule:
+    - cron:  '0 */6 * * *'
+      
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v2
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v1
+
+      - name: Install packages
+        run: npm install
+
+      - name: (Re)build README
+        run: npm --silent run build > README.md
+        env:
+          GITHUB_TOKEN: ${{ secrets.PERSONAL_ACCESS_TOKEN }} 
+
+      - name: Check for changes (fail if none)
+        run: |
+          ! git diff --quiet
+
+      - name: Commit changes if required
+        if: ${{ success() }}
+        run: |
+          git config --global user.email "[email protected]"
+          git config --global user.name "jung-thomas"
+          git add README.md
+          git commit -m 'update README' || exit 0
+          git push
+        env:
+          GITHUB_TOKEN: ${{ secrets.PERSONAL_ACCESS_TOKEN }}           

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# next.js build output
+.next
+
+mta_archives/
+default-*.json
+
+# dotenv environment variables file
+.env
+
+# Visual Studio Code
+.vscode

README1.md

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+![SAP Tech Bytes header image](header-image.png)
+
+[![REUSE status](https://api.reuse.software/badge/github.com/SAP-samples/sap-tech-bytes)](https://api.reuse.software/info/github.com/SAP-samples/sap-tech-bytes)
+
+This repository provides small sets of configuration & code relating to video episodes, blog posts and other content in the SAP Tech Bytes initiative, which it accompanies.
+
+## Description
+
+Where there's sample code or configuration to share, specifically relating to an SAP Tech Bytes episode or post, you'll most likely find it here. The structure of this repository is simple - there are individual **branches**, each one relating to a specific SAP Tech Bytes episode or blog post.
+
+Perhaps most of the time you'll be arriving at this repository, coming from such an episode or blog post, so you'll be sent to the appropriate branch like that. But if you're starting here and want to find out to which SAP Tech Bytes episode or blog post a given branch-based sample relates, you'll find the back link in the README in that branch.

README2.md

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+## Requirements
+
+Requirements may differ from sample to sample, so please see the individual README files as appropriate.
+
+## Download and installation
+
+To enjoy this content, you don't have to download or install anything. But you can of course clone this repository to have the content available to you locally.
+
+From there, in order to try out a sample, simply check out the desired branch, and follow the instructions in the README there.
+
+## Support
+
+For the most part, this content is provided "as-is" with no other support. But we will certainly also respond to well-formed and detailed issues raised against this repository.
+
+## Contributing
+
+The general context of this repository is as a consumable store of sample configuration & code for SAP Tech Bytes episodes and blog posts. If you find you do have something to contribute, for example to offer fixes or improvements, please send an appropriate pull request (PR). Due to legal reasons, contributors will be asked to accept a [Developer Certificate of Origin (DCO)](https://en.wikipedia.org/wiki/Developer_Certificate_of_Origin) on submitting their first PR to this project. This DCO acceptance can be done in the PR itself - look out for the CLA assistant that will guide you through the simple process. SAP uses [the standard DCO text of the Linux Foundation](https://developercertificate.org/). Thank you!
+
+## License
+
+Copyright (c) 2020 SAP SE or an SAP affiliate company. All rights reserved. This project is licensed under the Apache Software License, version 2.0 except as noted otherwise in the [LICENSE](LICENSE) file.

build.js

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+const Parser = require('rss-parser')
+const request = require('then-request');
+const parser = new Parser({
+    headers: {
+        'Accept': 'application/atom+xml'
+    }
+})
+
+const Handlebars = require('handlebars')
+const source = require('./templateREADME')
+const template = Handlebars.compile(source)
+const { Octokit } = require("@octokit/core")
+const { createActionAuth } = require("@octokit/auth-action")
+const auth = createActionAuth()
+
+
+const URLYouTube = 'https://www.youtube.com/feeds/videos.xml?playlist_id=PL6RpkC85SLQC3HBShmlMaPu_nL--4f20z'
+const URLSCN = 'https://content.services.sap.com/feed?type=blogpost&tags=sap-tech-bytes'
+
+const sort_by = (field, reverse, primer) => {
+    const key = primer ?
+        (x) => {
+            return primer(x[field])
+        } :
+        (x) => {
+            return x[field]
+        }
+    reverse = !reverse ? 1 : -1
+    return (a, b) => {
+        return a = key(a), b = key(b), reverse * ((a > b) - (b > a))
+    }
+}
+
+const branchProcessing = async (item, octokit) => {
+    let branchDetails = await octokit.request('GET /repos/{owner}/{repo}/branches/{branch}', {
+        owner: 'SAP-samples',
+        repo: 'sap-tech-bytes',
+        branch: item.name
+    })
+    item.url = branchDetails.data._links.html
+    console.log(branchDetails.data)
+    item.authorName = branchDetails.data.commit.commit.author.name
+    return Promise.resolve(item)
+}
+
+const getBranches = async octokit => {
+    //Read List of Branches in the SAP Tech Bytes Repo
+    let branches = await octokit.request('GET /repos/{owner}/{repo}/branches', {
+        owner: 'SAP-samples',
+        repo: 'sap-tech-bytes'
+    })
+
+    //Delete the main branch from the list
+    let indexOfMain = branches.data.indexOf(branches.data.find(obj => {
+        return obj.name === 'main'
+    }))
+    if (indexOfMain !== -1) { branches.data.splice(indexOfMain, 1) }
+
+    //Sort by branch name 
+    branches.data.sort(sort_by('name', true, (a) => a.toUpperCase()))
+
+    //Return the most recent 6 branches and lookup the details for each branch
+    branchesNew = await Promise.all(branches.data.slice(0, 6).map(item => branchProcessing(item, octokit)))
+
+    return branchesNew
+}
+
+const getBlogPosts = async _ => {
+    //Read List of Blog Posts in the SAP Community Netwwork with tag sap-tech-bytes
+    const feed = await parser.parseURL(URLSCN)
+
+    //Sort by date
+    feed.items.sort(sort_by('pubDate', true))
+
+    //Return the most recent 6 Blog Posts
+    const items = feed.items.slice(0, 6).map(item => {
+        item.date = new Date(item.pubDate).toDateString()
+        return item
+    })
+    return items
+}
+
+const getYoutubeVideos = async _ => {
+    //Read List of Videos in the SAP Tech Bytes Playlist on YouTube
+    const feedNew = await parser.parseURL(URLYouTube)
+
+    //Sort by date
+    feedNew.items.sort(sort_by('pubDate', true))
+
+    //Return the most recent 6 Videos
+    const itemsNew = feedNew.items.slice(0, 6).map(item => {
+        item.date = new Date(item.pubDate).toDateString()
+        return item
+    })
+    return itemsNew
+}
+
+const getStaticREADME = async _ => {
+    const fs = require('fs')
+    return [readme1, readme2] = await Promise.all([
+        fs.readFileSync('./README1.md', 'utf8'),
+        fs.readFileSync('./README2.md', 'utf8')
+    ])
+}
+
+const main = async _ => {
+    try {
+        const authentication = await auth()
+        const octokit = new Octokit({ auth: authentication.token })
+        let [branches, blogPosts, videos, [readme1, readme2]] = await Promise.all([
+            getBranches(octokit),
+            getBlogPosts(),
+            getYoutubeVideos(),
+            getStaticREADME()
+        ])
+        console.log(template({ readme1, readme2, blogPosts, videos, branches }))
+    } catch (error) {
+        console.log(`${error}`)
+        process.exit(1)
+    }
+}
+
+main()