add 'git' option to include the git version

This uses the gitinfo2 package. To make this package option work
properly, you have to set up the git hooks available at https://ftp.fau.de/ctan/macros/latex/contrib/gitinfo2/post-xxx-sample.txt

mkessler-script.cls

@@ -10,6 +10,9 @@
 \DeclareOption{show version}{\showversiontrue}
 \DeclareOption{hideversion}{\showversionfalse}
 
+\newif\ifgitversion\gitversionfalse
+\DeclareOption{git}{\gitversiontrue}
+
 \ProcessOptions\relax
 
 
@@ -38,6 +41,14 @@
 %%%%Load base class article
 \LoadClass{article}
 
+
+\ifshowversion
+    \ifgitversion
+        \RequirePackage[dirty={ (local changes have been made!)}]{gitinfo2}
+    \fi
+\fi
+
+
 %%%%Title
 %Define layout of title using course, lecturer, assistant and author, and optionally the current time
 \RequirePackage{xparse}
@@ -73,7 +84,10 @@
     \vskip 3em%
         \begin{tabular}[t]{c}%
         {\small Version} \\
-        \today\,\currenttime
+        \ifgitversion
+            git: \gitFirstTagDescribe\\
+        \fi
+        \ifenglish compiled\else kompiliert\fi~: \today\,\currenttime \\
         \end{tabular}\par
     \fi
     \vskip 4em%