Add option to switch docs version

Author: Grippy98

.gitignore

@@ -8,3 +8,5 @@ build/
 # vale configs and intermediary data
 .github/styles/*
 !.github/styles/config
+/.venv
+.DS_Store

_templates/layout.html

@@ -1,24 +1,34 @@
 {% extends "!layout.html" %}
-{%- block extrahead %} 
-  <script src="https://www.ti.com/assets/js/headerfooter/analytics.js" type="text/javascript" charset="utf-8"></script>
-  {{ super() }}
+{%- block extrahead %}
+<script src="https://www.ti.com/assets/js/headerfooter/analytics.js" type="text/javascript" charset="utf-8"></script>
+{{ super() }}
 {% endblock %}
 {%- block sidebartitle %}
-  {# the logo helper function was removed in Sphinx 6 and deprecated since Sphinx 4 #}
-  {# the master_doc variable was renamed to root_doc in Sphinx 4 (master_doc still exists in later Sphinx versions) #}
-  {%- set _logo_url = logo_url|default(pathto('_static/' + (logo or ""), 1)) %}
-  {%- set _root_doc = root_doc|default(master_doc) %}
-  <a href="{{ pathto(_root_doc) }}"{% if not theme_logo_only %} class="icon icon-home"{% endif %}>
-    {% if not theme_logo_only %}{{ project }}{% endif %}
-    {%- if logo or logo_url %}
-      <img src="{{ _logo_url }}" class="logo" alt="{{ _('Logo') }}"/>
-    {%- endif %}
-  </a>
-  {%- set nav_version = version %}
-  {%- if nav_version %}
-    <div class="version">
-      {{ nav_version }}
-    </div>
+{# the logo helper function was removed in Sphinx 6 and deprecated since Sphinx 4 #}
+{# the master_doc variable was renamed to root_doc in Sphinx 4 (master_doc still exists in later Sphinx versions) #}
+{%- set _logo_url = logo_url|default(pathto('_static/' + (logo or ""), 1)) %}
+{%- set _root_doc = root_doc|default(master_doc) %}
+<a href="{{ pathto(_root_doc) }}" {% if not theme_logo_only %} class="icon icon-home" {% endif %}>
+  {% if not theme_logo_only %}{{ project }}{% endif %}
+  {%- if logo or logo_url %}
+  <img src="{{ _logo_url }}" class="logo" alt="{{ _('Logo') }}" />
   {%- endif %}
-  {%- include "searchbox.html" %}
-{% endblock %}
+</a>
+{%- set nav_version = version %}
+{%- if nav_version and versions %}
+<div class="version">
+  <select id="version-selector"
+    onchange="location.href = location.href.replace(/\/docs\/[^\/]+\//, '/docs/' + this.value + '/');"
+    style="background-color: white; color: black; border: 1px solid #d9d9d9; padding: 5px; border-radius: 3px;">
+    {% for v in versions %}
+    <option value="{{ v }}" {% if v==nav_version %}selected{% endif %}>{{ v }}</option>
+    {% endfor %}
+  </select>
+</div>
+{%- elif nav_version %}
+<div class="version">
+  {{ nav_version }}
+</div>
+{%- endif %}
+{%- include "searchbox.html" %}
+{% endblock %}

conf.py

@@ -16,6 +16,7 @@
 import sys
 import os
 import importlib
+import subprocess
 from datetime import datetime
 
 # If extensions (or modules to document with autodoc) are in another directory,
@@ -204,8 +205,34 @@
     "github_repo": "processor-sdk-doc",
     "github_version": "master",
     "conf_py_path": "/source/",
+    "versions": [],
 }
 
+def get_versions():
+    versions = ["master"]
+    try:
+        cmd = ["git", "ls-remote", "--tags", "--heads", "https://github.com/TexasInstruments/processor-sdk-doc"]
+        output = subprocess.check_output(cmd).decode('utf-8').splitlines()
+        tags = []
+        for line in output:
+            parts = line.split()
+            if len(parts) == 2:
+                ref = parts[1]
+                if ref.startswith("refs/tags/"):
+                    tag = ref.replace("refs/tags/", "")
+                    tags.append(tag)
+
+        # Sort tags descending
+        tags.sort(reverse=True)
+        versions.extend(tags)
+    except Exception as e:
+        print(f"Error fetching versions: {e}")
+        # Fallback
+        versions = ["master"]
+    return versions
+
+html_context["versions"] = get_versions()
+
 # -- Options for LaTeX output ---------------------------------------------
 
 latex_elements = {