bibliography for KOMA-Script auto-sizing itself by largest entry

teckids2jahresbericht.cls

@@ -19,11 +19,11 @@
 % of said person’s immediate fault when using the work as intended.
 
 \NeedsTeXFormat{LaTeX2e}%
-\ProvidesClass{teckids2jahresbericht}[2019/05/14 1.2 Teckids Jahresbericht class]%
+\ProvidesClass{teckids2jahresbericht}[2019/05/15 1.2 Teckids Jahresbericht class]%
 
 \PassOptionsToPackage{paper=a4}{typearea}%
 \RequirePackage{fancyhdr}%
-\LoadClass[toc=sectionentrywithdots]{scrartcl}%
+\LoadClass[bibliography=totocnumbered,bibliography=leveldown,toc=sectionentrywithdots]{scrartcl}%
 \RequirePackage{teckids2style}%
 
 \RequirePackage{tikz}%

teckids2proto.cls

@@ -19,11 +19,11 @@
 % of said person’s immediate fault when using the work as intended.
 
 \NeedsTeXFormat{LaTeX2e}%
-\ProvidesClass{teckids2proto}[2019/05/14 0.2 Teckids Protokoll TeX/LaTeX class, second epoch]%
+\ProvidesClass{teckids2proto}[2019/05/15 0.2 Teckids Protokoll TeX/LaTeX class, second epoch]%
 
 \PassOptionsToPackage{paper=a4}{typearea}%
 \RequirePackage{fancyhdr}%
-\LoadClass[toc=sectionentrywithdots]{scrartcl}%
+\LoadClass[bibliography=totocnumbered,bibliography=leveldown,toc=sectionentrywithdots]{scrartcl}%
 \RequirePackage{teckids2style}%
 
 \newcommand{\teckidsprotohdr}[1]{%

teckids2pubmat.cls

 % Dokumentklasse „Unterrichtsmaterial 2.0“ für den Teckids e.V.
 %
-% Copyright © 2015, 2017, 2018
+% Copyright © 2015, 2017, 2018, 2019
 %	Thorsten Glaser <thorsten.glaser@teckids.org>
 % Copyright © 2013
 %	Dominik George <nik@naturalnet.de>
@@ -21,11 +21,11 @@
 % of said person’s immediate fault when using the work as intended.
 
 \NeedsTeXFormat{LaTeX2e}%
-\ProvidesClass{teckids2pubmat}[2019/05/14 1.4 Teckids OER TeX/LaTeX class, second epoch]%
+\ProvidesClass{teckids2pubmat}[2019/05/15 1.4 Teckids OER TeX/LaTeX class, second epoch]%
 
 \PassOptionsToPackage{paper=a4}{typearea}%
 \RequirePackage{fancyhdr}%
-\LoadClass[toc=sectionentrywithdots]{scrartcl}%
+\LoadClass[bibliography=totocnumbered,bibliography=leveldown,toc=sectionentrywithdots]{scrartcl}%
 \RequirePackage{teckids2style}%
 
 \newcommand{\teckidspubmatnamegroup}{%

teckids2style.sty

@@ -31,7 +31,7 @@
 % • (em dash) → \dash
 
 \NeedsTeXFormat{LaTeX2e}%
-\ProvidesPackage{teckids2style}[2019/05/14 1.12 Teckids TeX/LaTeX style, second epoch]% for Tₑχ/LᴬTᴇΧ
+\ProvidesPackage{teckids2style}[2019/05/15 1.14 Teckids TeX/LaTeX style, second epoch]% for Tₑχ/LᴬTᴇΧ
 
 \RequirePackage{accsupp}%
 \RequirePackage[utf8]{inputenc}%
@@ -468,5 +468,26 @@
  \begin{minipage}[c]{.4\linewidth}\teckidslogo[\linewidth]\end{minipage}
 }%
 
+% use \begin{autosizedbibliography}
+% to auto-detect the widest reference label
+\gdef\bibitem@longest{1}%
+\AtEndDocument{\immediate\write\@auxout{\gdef\noexpand\bibitem@longest{\bibitem@longest}}}%
+\newenvironment{autosizedbibliography}{%
+ \begin{thebibliography}{\bibitem@longest}%
+}{%
+ \end{thebibliography}%
+}%
+\let\bibitem@stock\bibitem%
+\newcommand{\bibitem@sizer}[2][]{%
+ \settowidth\@tempdimb{\@biblabel{#1}}%
+ \settowidth\@tempdima{\@biblabel{\bibitem@longest}}%
+ \ifdim\@tempdima<\@tempdimb%
+  \gdef\bibitem@longest{#1}%
+ \fi%
+ \bibitem@stock[#1]{#2}%
+}%
+% now \bibitem{foo} = \bibitem[foo]{foo}
+\renewcommand{\bibitem}{\@dblarg\bibitem@sizer}%
+
 % uncomment to figure out overfull hbox
 %\overfullrule=2cm

teckids2urkunde.cls

@@ -19,11 +19,11 @@
 % of said person’s immediate fault when using the work as intended.
 
 \NeedsTeXFormat{LaTeX2e}%
-\ProvidesClass{teckids2jahresbericht}[2019/05/14 1.1 Teckids Urkunde class]%
+\ProvidesClass{teckids2jahresbericht}[2019/05/15 1.1 Teckids Urkunde class]%
 
 \PassOptionsToPackage{paper=a4}{typearea}%
 \RequirePackage{fancyhdr}%
-\LoadClass[toc=sectionentrywithdots]{scrartcl}%
+\LoadClass[bibliography=totocnumbered,bibliography=leveldown,toc=sectionentrywithdots]{scrartcl}%
 \RequirePackage{teckids2style}%
 
 \teckidsgeometry[hmargin=2cm,top=0.5cm]%