Add recent blog posts to the organisation README (#2)

We fetch from our main RSS feed every day at 11:00 UTC, then update the
"blog" section in the README, which is marked using a comment. It then
commits and pushes the changes.

This is based on some prior work here: https://github.com/nickcharlton/nickcharlton

Author: nickcharlton

.github/workflows/tests.yml

@@ -0,0 +1,17 @@
+---
+name: Test
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+      - name: Install dependencies
+        run: bundle install
+      - name: Run tests
+        run: bundle exec rspec

.github/workflows/update_readme.yml

@@ -0,0 +1,31 @@
+---
+name: Update README
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 11 * * *'
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        bundler-cache: true
+    - name: Install dependencies
+      run: bundle install
+    - name: Update README
+      run: |-
+        bin/update_readme
+        cat profile/README.md
+    - name: Commit and push if changed
+      run: |-
+        git diff
+        git config --global user.email "[email protected]"
+        git config --global user.name "README Bot"
+        git add -A
+        git commit -m "Updated content" || exit 0
+        git push

.gitignore

@@ -0,0 +1,2 @@
+.bundle
+vendor

.ruby-version

@@ -0,0 +1 @@
+ruby-3.4.1

Gemfile

@@ -0,0 +1,8 @@
+source "https://rubygems.org"
+
+gem "excon"
+gem "feedjira"
+
+group :development, :test do
+  gem "rspec"
+end

Gemfile.lock

@@ -0,0 +1,57 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    crass (1.0.6)
+    diff-lcs (1.5.1)
+    excon (1.2.2)
+    feedjira (3.2.3)
+      loofah (>= 2.3.1, < 3)
+      sax-machine (>= 1.0, < 2)
+    loofah (2.23.1)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.12.0)
+    mini_portile2 (2.8.8)
+    nokogiri (1.18.1)
+      mini_portile2 (~> 2.8.2)
+      racc (~> 1.4)
+    nokogiri (1.18.1-aarch64-linux-gnu)
+      racc (~> 1.4)
+    nokogiri (1.18.1-arm-linux-gnu)
+      racc (~> 1.4)
+    nokogiri (1.18.1-arm64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.18.1-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.18.1-x86_64-linux-gnu)
+      racc (~> 1.4)
+    racc (1.8.1)
+    rspec (3.13.0)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.2)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.3)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.2)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.2)
+    sax-machine (1.3.2)
+
+PLATFORMS
+  aarch64-linux
+  arm-linux
+  arm64-darwin
+  x86-linux
+  x86_64-darwin
+  x86_64-linux
+
+DEPENDENCIES
+  excon
+  feedjira
+  rspec
+
+BUNDLED WITH
+   2.5.23

bin/update_readme

@@ -0,0 +1,14 @@
+#!/usr/bin/env ruby
+
+require "bundler"
+
+Bundler.require
+
+$:.push File.expand_path("../lib", __dir__)
+
+require "github_readme"
+
+readme = Readme.new("profile/README.md")
+blog = RssFeed.new(url: "https://feeds.feedburner.com/GiantRobotsSmashingIntoOtherGiantRobots")
+
+readme.update(section: "blog", items: blog.take(5))

lib/feed_item.rb

@@ -0,0 +1,15 @@
+class FeedItem
+  attr_accessor :id, :title, :url, :updated_at, :created_at
+
+  def initialize(id:, title:, url:, created_at:, updated_at:)
+    @id = id
+    @title = title
+    @url = url
+    @created_at = created_at
+    @updated_at = updated_at
+  end
+
+  def to_readme_line
+    "[#{title}](#{url})\n"
+  end
+end

lib/github_readme.rb

@@ -0,0 +1,5 @@
+require "excon"
+
+require "feed_item"
+require "rss_feed"
+require "readme"

lib/readme.rb

@@ -0,0 +1,32 @@
+class Readme
+  def initialize(file_path)
+    @file_path = file_path
+  end
+
+  def update(section:, items:)
+    content = items.map(&:to_readme_line).join("\n")
+    new_contents = insert(file_contents, section, content)
+    File.write(file_path, new_contents)
+  end
+
+  private
+
+  attr_reader :file_path
+
+  def file_contents
+    File.read(file_path)
+  end
+
+  def insert(document, marker, content)
+    replacement = <<~REPLACEMENT
+      <!-- #{marker} starts -->
+      #{content}
+      <!-- #{marker} ends -->
+    REPLACEMENT
+
+    document.gsub(
+      /<!\-\- #{marker} starts \-\->.*<!\-\- #{marker} ends \-\->/m,
+      replacement.chomp
+    )
+  end
+end