Dynamically update user list

Gemfile

@@ -56,3 +56,5 @@ group :test do
   gem "capybara"
   gem "selenium-webdriver"
 end
+
+gem "open3", "~> 0.2.1"

Gemfile.lock

@@ -147,6 +147,7 @@ GEM
       racc (~> 1.4)
     nokogiri (1.16.7-x86_64-linux)
       racc (~> 1.4)
+    open3 (0.2.1)
     psych (5.1.2)
       stringio
     public_suffix (6.0.1)
@@ -251,6 +252,7 @@ DEPENDENCIES
   debug
   importmap-rails
   jbuilder
+  open3 (~> 0.2.1)
   puma (>= 5.0)
   rails (~> 7.1.3, >= 7.1.3.4)
   selenium-webdriver

app/helpers/home_helper.rb

@@ -1,2 +1,23 @@
+require 'open3'
+
 module HomeHelper
+
+  def list_all_users
+    stdout, stderr, status = Open3.capture3('getent', 'passwd')
+    return [] unless status.success?
+    valid_users = stdout.split("\n").select { |user| user.start_with?(/\w/) }.map(&:split).map(&:first)
+    valid_users.map do |user|
+      user.split(':')[0]
+    end
+  end
+
+  def users_with_public_html(users)
+    users.select do |user|
+      home_dir = Dir.home(user)
+      File.exist?(File.join(home_dir, 'public_html'))
+    end
+  end
+
+  users = list_all_users
+  users_with_public_html(users)
 end

app/views/home/index.html.erb

@@ -7,14 +7,9 @@
 <div class="section">
   <p>Members</p>
   <ul class="members">
-    <li><a href="/~amr">~amr</a></li>
-    <li>~raf</li>
-    <li><a href="/~floppy">~floppy</a></li>
-    <li>~peachy</li>
-    <li><a href="/~gld">~gld</a></li>
-    <li><a href="/~cam">~cam</a></li>
-    <li>~buddyatmos</li>
-    <li>~dkay</li>
+    <% list_all_users.each do |user| %>
+      <li><a href="/~<%= user %>"><%= user %></a></li>
+    <% end %>
   </ul>
 </div>
 <div class="section">