Added \thesis@xpatch command

fithesis.dtx

@@ -465,6 +465,8 @@
 %   \item\textsf{inputenc} -- Used to enable the input UTF-8
 %     encoding. This package does not get loaded under
 %     the \Hologo{XeTeX} and \Hologo{LuaTeX} engines.
+%   \item\textsf{xpatch} -- Used to redefine parts of code
+%     in macros without redefining the whole macro.
 % \end{itemize}
 % The \texttt{hyperref} package is also conditionally loaded during
 % the expansion of the |\thesis@load| macro (see Section
@@ -479,6 +481,7 @@
 \ifxetex\else\ifluatex\else
   \RequirePackage[utf8]{inputenc}
 \fi\fi
+\RequirePackage{xpatch}
 %    \end{macrocode}
 % \section{Public API}
 % \label{sec:public-api}
@@ -1850,13 +1853,14 @@
   \expandafter\thesis@patch@versions\expandafter,\relax,}
 %    \end{macrocode}
 % \end{macro}
-% \begin{macro}{\thesis@xpatchError}
-% The |\thesis@xpatchError| macro is used to test for error of the given
-% \textit{xpatchcmd}. If the \textit{xpatchcmd} fails, a class error is
-% written to the output.
-%    \begin{macrocode}
-\def\thesis@xpatchError{%
-    \ClassError{xpatchcmd}{The class does not contain searched text}}
+% \begin{macro}{\thesis@xpatch}
+% The |\thesis@xpatch| macro is used to to replace code in a searched
+% macro by the replacement code via \textit{xpatchcmd} If the 
+% \textit{xpatchcmd} fails, a class error is written to the output.
+%    \begin{macrocode}
+\def\thesis@xpatch#1#2#3{%
+    \xpatchcmd{#1}{#2}{#3}{}%
+      {\ClassError{fithesis4}{The command #1 does not contain searched text}}}
 %    \end{macrocode}
 % \end{macro}
 % \iffalse

style/mu/law.dtx

@@ -38,17 +38,13 @@
 %    \end{macrocode}
 % Each footnote is uniquely numbered across the entire document as
 % per the formal requirements of the faculty.
-% \changes{v1.0.0}{2021/03/22}{Added \textsf{regexpatch} package to
-%   redefine the layout of titlePage. [TV]}
 %    \begin{macrocode}
-\thesis@require{xpatch}
 \thesis@require{chngcntr}
 \counterwithout{footnote}{chapter}
 %    \end{macrocode}
 % The style file configures the upper part of the title page headers
 % to include the name of the department and the study field
-% which are by default in the bottom part of the title page. Upon failure
-% of the \textit{xpatchcmd}, \cs{thesis@xpatchError} is called.
+% which are by default in the bottom part of the title page.
 % \changes{v1.0.0}{2021/04/23}{^^A
 %   The style files for the Faculty of Law at the Masaryk University
 %   in Brno no longer redefine the \cs{thesis@blocks@cover@header}
@@ -57,7 +53,7 @@
 %   layout as per the faculty requirements. Department name and
 %   field are in the upper part of the titlePage. [TV]}
 %    \begin{macrocode}
-\xpatchcmd{\thesis@blocks@titlePage}
+\thesis@xpatch{\thesis@blocks@titlePage}
 {{\sf\thesis@titlePage@large\thesis@@{advisorTitle}: \thesis@advisor}%
    \par\vspace{0.75cm}%
    \ifthesis@blocks@titlePage@department@
@@ -74,10 +70,9 @@
 	\thesis@field@name}%
    \fi
    \par\vfill
-}
-{}{}{\thesis@xpatchError{}}
+}{}
 
-\xpatchcmd{\thesis@blocks@titlePage}
+\thesis@xpatch{\thesis@blocks@titlePage}
 {{\sf\thesis@titlePage@large\thesis@@upper{facultyName}}%
  \par\vspace{1.75cm}%
 }
@@ -88,7 +83,6 @@
  {\sf\thesis@titlePage@large\thesis@department@name}
  \par\vspace{1.75cm}%
 }
-{}{\thesis@xpatchError{}}
 %    \end{macrocode}
 % \begin{macro}{\thesis@blocks@frontMatter}
 % The |\thesis@blocks@frontMatter| macro sets up the style

style/mu/med.dtx

@@ -82,13 +82,10 @@
 % 16\,cm in accordance with the formal requirements of the faculty.
 % This leads to overfull lines and is against the good conscience
 % of the author of this style.
-% \changes{v1.0.0}{2021/03/22}{Added \textsf{xpatch} package to
-%   redefine layout of titlePage. [TV]}
 %    \begin{macrocode}
 \thesis@require{tikz}
 \thesis@require{geometry}
 \thesis@require{setspace}
-	\thesis@require{xpatch}
 \geometry{top=25mm,bottom=20mm,left=25mm,right=25mm,includeheadfoot}
 %    \end{macrocode}
 % The style file configures the upper part of the title page headers
@@ -111,7 +108,7 @@
 %   in Brno no longer redefine the \cs{thesis@blocks@cover} macro.
 %   [TV]}
 %    \begin{macrocode}
-\xpatchcmd{\thesis@blocks@titlePage}
+\thesis@xpatch{\thesis@blocks@titlePage}
 {{\sf\thesis@titlePage@large\thesis@@{advisorTitle}: \thesis@advisor}%
    \par\vspace{0.75cm}%
    \ifthesis@blocks@titlePage@department@
@@ -128,10 +125,9 @@
 	\thesis@field@name}%
    \fi
    \par\vfill
-}
-{}{}{\thesis@xpatchError{}}
+}{}
 
-\xpatchcmd{\thesis@blocks@titlePage}
+\thesis@xpatch{\thesis@blocks@titlePage}
 {{\sf\thesis@titlePage@large\thesis@@upper{facultyName}}%
  \par\vspace{1.75cm}%
 }
@@ -142,7 +138,6 @@
  {\sf\thesis@titlePage@large\thesis@department@name}
  \par\vspace{1.75cm}%
 }
-{}{\thesis@xpatchError{}}
 %    \end{macrocode}
 % \begin{macro}{\thesis@blocks@frontMatter}
 % The |\thesis@blocks@frontMatter| macro sets up the style of the