Merge pull request #371 from marquiz/documentation/dynamic-version-menu

docs: make the list of available versions dynamic

docs/_config.yml

@@ -40,9 +40,7 @@ remote_theme: rundocs/jekyll-rtd-theme@v2.0.9
 #   - vendor/gems/
 #   - vendor/ruby/
 
-# Document versioning. Current 'version' should be listed under
-# 'versions' as we use it in constructing the baseurl for other
-# versions.
+# Document versioning
 version: master
-versions:
-  - master
+display_version_list: true
+

docs/_includes/class/addons-wrap.liquid

@@ -1,30 +1,30 @@
 <div class="addons-wrap d-flex flex-column overflow-y-auto">
     <div class="branch">
         <dl>
-            <dt>Versions:</dt>
+            {% if site.display_version_list %}
+                <dt id="versions">Versions:</dt>
 
-            {% comment %}
-            The following ugly construction is solely for the
-            purpose of dropping the "version" suffix from the
-            baseurl. The reason for doing this is that github-pages
-            gem forces us on --safe mode (i.e. disables custom
-            plugins) so we're not able to write a simple ruby
-            plugin doing delete_suffix()
-            {% endcomment %}
-            {% assign version_len = site.version | size %}
-            {% assign baseurl_len = site.baseurl | size %}
-            {% assign idx = baseurl_len | minus: version_len %}
-            {% assign suffix = site.baseurl | slice: idx, version_len %}
-            {% if suffix == site.version %}
-                {% assign idx = idx | minus: 1 %}
-                {% assign baseurl = site.baseurl | slice: 0, idx %}
-            {% else %}
-                {% assign baseurl = site.baseurl %}
+                {% comment %}
+                Drop the last component from site.baseurl which is supposed to
+                be pointing to a subdirectory of the true site baseurl.
+                {% endcomment %}
+                {% assign spliturl = site.baseurl | split: "/" %}
+                {% assign last = spliturl.size | minus: 1 %}
+                {% assign baseurl = spliturl | slice: 0, last | join: "/" %}
+
+                <script src="{{ baseurl }}/versions.js"></script>
+                <script>
+                    var dt = document.getElementById('versions');
+                    var items = getVersionListItems();
+                    for (var i=0; i < items.length; i++) {
+                      var dd = document.createElement('dd');
+                      var a = dd.appendChild(document.createElement('a'));
+                      a.appendChild(document.createTextNode(items[i].name));
+                      a.href = items[i].url;
+                      dt.appendChild(dd);
+                    }
+                </script>
             {% endif %}
-
-            {% for version in site.versions %}
-                <dd><a href="{{ baseurl }}/{{ version }}/">{{ version }}</a></dd>
-            {% endfor %}
         </dl>
     </div>
     <div class="status d-flex flex-justify-between p-2">

scripts/github/update-gh-pages.sh

@@ -14,6 +14,19 @@ Options:
 EOF
 }
 
+# Helper function for detecting available versions from the current directory
+create_versions_js() {
+    local _baseurl="/node-feature-discovery"
+
+    echo -e "function getVersionListItems() {\n  return ["
+    # 'stable' is a symlink pointing to the latest version
+    [ -f stable ] && echo "    { name: 'stable', url: '$_baseurl/stable' },"
+    for f in `ls -d */  | tr -d /` ; do
+        echo "    { name: '$f', url: '$_baseurl/$f' },"
+    done
+    echo -e "  ];\n}"
+}
+
 #
 # Argument parsing
 #
@@ -103,6 +116,12 @@ fi
 # Switch to work in the gh-pages worktree
 cd "$build_dir"
 
+_stable=`(ls -d1 v*/ || :) | sort -n | tail -n1`
+[ -n "$_stable" ] && ln -sfT "$_stable" stable
+
+# Detect existing versions from the gh-pages branch
+create_versions_js > versions.js
+
 if [ -z "`git status --short`" ]; then
     echo "No new content, gh-pages branch already up-to-date"
     exit 0