Add selection of Manual version

doc/utils/sphinx-config/_themes/lammps_theme/layout.html

@@ -138,10 +138,6 @@
             {% if READTHEDOCS and current_version %}
               {%- set nav_version = current_version %}
             {% endif %}
-            {% if nav_version %}
-              <div class="lammps_version">Version: <b>{{ nav_version }}</b></div>
-              <div class="lammps_release">git info: {{ release }}</div>
-            {% endif %}
           {% endif %}
 
           {% include "searchbox.html" %}

doc/utils/sphinx-config/_themes/lammps_theme/versions.html

@@ -1,9 +1,9 @@
-{% if READTHEDOCS %}
+{% if READTHEDOCS or display_manual_versions %}
 {# Add rst-badge after rst-versions for small badge style. #}
   <div class="rst-versions" data-toggle="rst-versions" role="note" aria-label="versions">
     <span class="rst-current-version" data-toggle="rst-current-version">
-      <span class="fa fa-book"> Read the Docs</span>
-      v: {{ current_version }}
+      <span class="fa fa-book"> Version</span>
+      {{ current_version }}
       <span class="fa fa-caret-down"></span>
     </span>
     <div class="rst-other-versions">
@@ -20,14 +20,8 @@
         {% endfor %}
       </dl>
       <dl>
-        {# Translators: The phrase "Read the Docs" is not translated #}
-        <dt>{{ _('On Read the Docs') }}</dt>
-          <dd>
-            <a href="//{{ PRODUCTION_DOMAIN }}/projects/{{ slug }}/?fromdocs={{ slug }}">{{ _('Project Home') }}</a>
-          </dd>
-          <dd>
-            <a href="//{{ PRODUCTION_DOMAIN }}/builds/{{ slug }}/?fromdocs={{ slug }}">{{ _('Builds') }}</a>
-          </dd>
+        <dt>Git Info</dt>
+        <dd><a href="https://github.com/lammps/lammps/tree/{{ git_commit }}" target="_blank">{{ release }}</a></dd>
       </dl>
     </div>
   </div>

doc/utils/sphinx-config/conf.py.in

@@ -99,6 +99,16 @@ def get_git_info():
         pass
     return git_n_date
 
+def get_git_commit():
+    import subprocess,time
+    try:
+        commit = subprocess.run(['git','rev-parse','HEAD'],stdout=subprocess.PIPE,stderr=subprocess.PIPE)
+        if commit.returncode == 0:
+            return commit.stdout.decode()
+    except:
+        pass
+    return ''
+
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
@@ -108,6 +118,8 @@ version = get_lammps_version()
 # The full version, including alpha/beta/rc tags.
 release = get_git_info()
 
+git_commit = get_git_commit()
+
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
 #language = None
@@ -389,3 +401,18 @@ breathe_domain_by_extension = { 'h'   : 'cpp',
                                 'cpp' : 'cpp',
                                 'c'   : 'c',
                                 }
+
+# allows showing multiple versions
+try:
+   html_context
+except NameError:
+   html_context = dict()
+
+html_context['display_manual_versions'] = True
+html_context['current_version'] = version
+html_context['git_commit'] = git_commit
+html_context['versions'] = [
+  ('latest', 'https://docs.lammps.org/'),
+  ('8 Apr 2021', 'https://lammps.sandia.gov/doc/')
+]
+html_context['downloads'] = [('PDF', 'Manual.pdf')]