support passing the lehrerversion toggle via env

1 files changed, 25 insertions, 0 deletions

diff --git a/latex/common_options.tex b/latex/common_options.tex
index b76dd419..a32368a8 100644
--- a/latex/common_options.tex
+++ b/latex/common_options.tex
@@ -7,6 +7,31 @@
 
 \ProcessOptions\relax
 
+\RequirePackage{xparse}
+
+\ExplSyntaxOn
+
+\NewDocumentCommand{\getenv}{om}
+ {
+  \sys_get_shell:nnN { kpsewhich ~ --var-value ~ #2 } { } \l_tmpa_tl
+  \tl_trim_spaces:N \l_tmpa_tl
+  \IfNoValueTF { #1 }
+   {
+    \tl_use:N \l_tmpa_tl
+   }
+   {
+    \tl_set_eq:NN #1 \l_tmpa_tl
+   }
+ }
+
+\ExplSyntaxOff
+
+\getenv[\lehrerversionEnv]{LESSON_LEHRERVERSION}
+
+\ifdefstring{\lehrerversionEnv}{true}{
+  \toggletrue{lehrerversion}%
+}{}
+
 \iftoggle{debug}{
    \RequirePackage{showframe} % Seitenlayout anzeigen
 }{}