put versions and commits on landing page

Makefile

@@ -1,5 +1,6 @@
 install:
-	cp notes2web.py n2w_add_uuid.py /usr/local/bin
+	cp  n2w_add_uuid.py /usr/local/bin
+	sed "s/N2W_COMMIT = \"\"/N2W_COMMIT = \"$$(git rev-parse HEAD)\"/" notes2web.py > /usr/local/bin/notes2web.py
 	pip3 install -r requirements.txt
 	mkdir -p /opt/notes2web
 	cp -r templates /opt/notes2web

notes2web.py

@@ -21,6 +21,10 @@ INDEX_TEMPLATE_FOOT = None
 INDEX_TEMPLATE_HEAD = None
 EXTRA_INDEX_CONTENT = None
 
+N2W_COMMIT = ""
+# how many characters of a commit to show on landing page
+COMMIT_SHA1_NCHARS = 7
+
 
 def is_plaintext(filename):
     return re.match(r'^text/', magic.from_file(str(filename), mime=True)) is not None
@@ -65,6 +69,15 @@ def get_inherited_tags(file, base_folder):
     return list(set(tags))
 
 
+def git_head_sha1(working_dir):
+    git_response = subprocess.run(
+            [ 'git', f"--git-dir={working_dir.joinpath('.git')}", 'rev-parse', 'HEAD' ],
+            stdout=subprocess.PIPE
+    ).stdout.decode('utf-8')
+
+    return git_response.strip()
+
+
 def git_filehistory(working_dir, filename):
     print(f"{pathlib.Path(filename).relative_to(working_dir)=}")
     git_response = subprocess.run(
@@ -392,6 +405,8 @@ def main(args):
         with open(args.home_index) as fp2:
             html = re.sub(r'\$title\$', args.output_dir.parts[0], fp2.read())
             html = re.sub(r'\$h1title\$', args.output_dir.parts[0], html)
+            html = re.sub(r'\$n2w_commit\$', N2W_COMMIT[0:COMMIT_SHA1_NCHARS], html)
+            html = re.sub(r'\$notes_git_head_sha1\$', git_head_sha1(args.notes)[0:COMMIT_SHA1_NCHARS], html)
 
         html = re.sub(r'\$data\$', json.dumps(all_entries), html)
 

templates/home_index.html

@@ -20,7 +20,7 @@ Browse <a href="/notes">here</a> or by tag <a href="/.tags">here</a>.
 <div id="results">
 </div>
 
-<p class="smallText"> page generated by <a href="https://github.com/alvierahman90/notes2web">notes2web</a></p>
+<p class="smallText"> page generated by <a href="https://github.com/alvierahman90/notes2web">notes2web</a> (commit $n2w_commit$) notes commit $notes_git_head_sha1$</p>
 </div>
 <script src="/fuse.js"> </script>
 <script> const data = $data$ </script>