added experimental tree views

app/assets/stylesheets/application.scss

@@ -415,3 +415,59 @@ tr.top td{
   display: block;
   float: left;
 }
+
+/*
+ Tree structure using CSS:
+ http://stackoverflow.com/questions/14922247/how-to-get-a-tree-in-html-using-pure-css
+*/
+
+.tree, .tree ul{
+  list-style-type: none;
+  margin-left: 0 0 0 10px;
+  padding: 0;
+  position: relative;
+  overflow:hidden;
+}
+
+.tree li{
+  margin: 0;
+  padding: 0 12px;
+  position: relative;
+}
+
+.tree li::before, .tree li::after{
+  content: '';
+  position: absolute;
+  left: 0;
+}
+
+/* horizontal line on inner list items */
+.tree li::before{
+  border-top: 1px solid #999;
+  top: 10px;
+  width: 10px;
+  height: 0;
+}
+
+/* vertical line on list items */
+.tree li:after{
+  border-left: 1px solid #999;
+  height: 100%;
+  width: 0px;
+  top: -10px;
+}
+
+/* lower line on list items from the first level because they don't have parents */
+.tree > li::after{
+  top: 10px;
+}
+
+/* hide line from the last of the first level list items */
+.tree > li:last-child::after{
+  display: none;
+}
+
+
+.tree ul:last-child li:last-child:after{
+height:20px;
+}

app/controllers/tree_controller.rb

@@ -0,0 +1,3 @@
+class TreeController < ApplicationController
+  before_action :find_project
+end

app/models/dependency.rb

@@ -7,6 +7,7 @@ class Dependency < ActiveRecord::Base
   scope :with_project, -> { joins(:project).where('projects.id IS NOT NULL') }
   scope :without_project_id, -> { where(project_id: nil) }
   scope :with_project_name, -> { where("project_name <> ''") }
+  scope :kind, ->(kind) { where(kind: kind) }
 
   after_create :update_project_id
 

app/views/tree/_dependency.html.erb

@@ -0,0 +1,20 @@
+<% requirements ||= '' %>
+<% @license_names << project.normalize_licenses %>
+<li>
+  <%= project %> - <%= version.number  %> <em class='text-muted'><%= requirements %> - <%= project.normalize_licenses.join(', ') %> <% if project.status.present? && project.status.downcase != 'active' %>- <%= project.status %><% end %></em>
+  <% dependencies = version.dependencies.kind('normal').includes(:project) %>
+  <% if dependencies.any? %>
+    <ul>
+      <%dependencies.each do |dependency| %>
+        <% if dependency.project && index < 10 && !@project_names.include?(dependency.project_name) %>
+          <% @project_names << dependency.project_name %>
+          <%= render partial: 'tree/dependency', locals: {project: dependency.project, version: dependency.project.latest_stable_release, requirements: dependency.requirements, index: index + 1} %>
+        <% else %>
+        <li>
+          <%= dependency.project_name %> <em class='text-muted'><%= dependency.requirements %></em>
+        </li>
+        <% end %>
+      <% end %>
+    </ul>
+  <% end %>
+</li>

app/views/tree/_reverse_dependency.html.erb

@@ -0,0 +1,16 @@
+<li>
+  <%= project.name %> - <em class='text-muted'><%= project.normalize_licenses.join(', ') %></em>
+  <% dependents = project.dependent_projects %>
+  <% if dependents.any? %>
+    <ul>
+      <% dependents.each do |dependent| %>
+        <% if index < 3 && !@project_names.include?(dependent.name) %>
+          <% @project_names << dependent.name %>
+          <%= render partial: 'tree/reverse_dependency', locals: {project: dependent, index: index + 1} %>
+        <% else %>
+          <li><%= dependent.name %>  - <em class='text-muted'><%= project.normalize_licenses.join(', ') %></em></li>
+        <% end %>
+      <% end %>
+    </ul>
+  <% end %>
+</li>

app/views/tree/reverse.html.erb

@@ -0,0 +1,10 @@
+<h1>Reverse Dependency Tree for <%= link_to @project, project_path(@project.to_param) %> on <%= link_to @project.platform, platform_path(@project.platform) %> </h1>
+
+<% version = @project.latest_version %>
+<% project = @project %>
+<% @project_names = [@project.name] %>
+<% @license_names = @project.normalize_licenses %>
+
+<ul class='tree'>
+  <%= render partial: 'tree/reverse_dependency', locals: {project: project, index: 0} %>
+</ul>

app/views/tree/show.html.erb

@@ -0,0 +1,17 @@
+<h1>Dependency Tree for <%= link_to @project, project_path(@project.to_param) %> on <%= link_to @project.platform, platform_path(@project.platform) %> </h1>
+
+<% version = @project.latest_version %>
+<% project = @project %>
+<% @project_names = [@project.name] %>
+<% @license_names = @project.normalize_licenses %>
+
+<ul class='tree'>
+  <%= render partial: 'tree/dependency', locals: {project: project, version: version, requirements: '', index: 0} %>
+</ul>
+<hr>
+<p>
+  Unique dependencies: <%= @project_names.uniq.length %>
+</p>
+<p>
+  Unique licenses: <%= @license_names.flatten.uniq.length %> <em class='text-muted'><%= @license_names.flatten.uniq.join(', ') %></em>
+</p>

config/routes.rb

@@ -64,6 +64,9 @@
     get '/stats/github', to: 'stats#github', as: :github_stats
   end
 
+  get '/tree/:platform/:name', to: 'tree#show'
+  get '/reverse-tree/:platform/:name', to: 'tree#reverse'
+
   get '/github/issues', to: 'github_issues#index', as: :issues
 
   get '/pricing', to: 'account_subscriptions#plans', as: :pricing