From 9d51444479cec02d0b250ae65a91d36beb5f6b1b Mon Sep 17 00:00:00 2001
From: hellekin <hellekin@cepheide.org>
Date: Fri, 22 Jan 2021 14:45:15 +0100
Subject: Link to current source code version (per AGPL-3.0)

---
 app/assets/stylesheets/application/_footer.scss | 20 ++++++++++++++++++++
 app/helpers/application_helper.rb               | 11 +++++++++++
 app/lib/incommon.rb                             | 10 ++++++++++
 app/views/welcome/index.html.erb                |  4 ++++
 4 files changed, 45 insertions(+)
 create mode 100644 app/assets/stylesheets/application/_footer.scss

diff --git a/app/assets/stylesheets/application/_footer.scss b/app/assets/stylesheets/application/_footer.scss
new file mode 100644
index 0000000..4ab34a2
--- /dev/null
+++ b/app/assets/stylesheets/application/_footer.scss
@@ -0,0 +1,20 @@
+body>footer {
+    position: absolute;
+    z-index: 1004;
+    margin: 0 auto;
+    background-color: rgba(0,0,0,0.5);
+    color: white;
+    text-align: center;
+    bottom: 0;
+    left: 0;
+    right: 0;
+    width: 10rem;
+    border-top-left-radius: 1rem;
+    border-top-right-radius: 1rem;
+}
+
+.app-version a:link,
+.app-version a:visited {
+    color: whitesmoke;
+}
+
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index e39da5f..89b3b6d 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -23,6 +23,17 @@ module ApplicationHelper
       ).to_html.html_safe, class: 'markdown')
   end
 
+  # Display current application version
+  def version_string
+    version = begin
+                IO.read('.app-version')&.strip
+              rescue
+                'HEAD'
+              end
+
+    tag.div(link_to(version, INCOMMON.repo_url(version), title: 'Read source code'), class: 'app-version')
+  end
+
   private
 
   # CommonMarker extensions
diff --git a/app/lib/incommon.rb b/app/lib/incommon.rb
index 091f022..c2f30b5 100644
--- a/app/lib/incommon.rb
+++ b/app/lib/incommon.rb
@@ -3,4 +3,14 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
 module INCOMMON
+  module_function
+  def repo_url(version)
+    case version
+    when /^(HEAD|v\d)/
+      query="h=#{version}"
+    else
+      query="h=HEAD&id=#{version}"
+    end
+    URI.parse("https://code.cepheide.org/incommon-map.git/tree/?#{query}").to_s
+  end
 end
diff --git a/app/views/welcome/index.html.erb b/app/views/welcome/index.html.erb
index d9fd0f6..a7bf9b8 100644
--- a/app/views/welcome/index.html.erb
+++ b/app/views/welcome/index.html.erb
@@ -16,3 +16,7 @@
     <% if current_user.present? %>
     <% end %><%# ensure it does not break when we don't have a record... %>
 <% end %>
+
+<% content_for :footer do %>
+    <%= version_string %>
+<% end %>
-- 
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