Nested commands and their arguments

Question

Please consider this code snips:

\def\chaptermark##1{\markboth{\@chapapp\ \thechapter\ ##1}{##1}}    % left mark & right marks

and

\def\sectionmark##1{\markright{##1}}

How can I redefine \sectionmark{} so that it contains the value (the ##1 argument) from \chaptermark##1 in \markright{}?

i.e something like this :

\def\sectionmark{\markright{\chaptermark##1{##1}}}

Answer 1

My thought is to define some sort of dummy variable/quantity with a default value which is changed as appropriate by \chaptermark and used by \sectionmark. For instance (keeping in mind I don't use \def much/at all):

\def\dummy {some default value}
\def\chaptermark##1{\markboth{\@chapapp\ \thechapter\ ##1}{##1} \def\dummy{##1}}
\def\sectionmark{\markright{\dummy}}

Answer 2

Just what I was looking for, in my case I wanted a different style when there is only a chapter title but no sections (table of contets, glossary, etc in my thesis) and the rest that contains section to display the chapter but with different style. In case someone wonders this is the working code

\def\dummy{dummy}
\renewcommand{\chaptermark}[1]{\markboth{\MakeUppercase{\thechapter. #1 }}{\thechapter. #1} \def\dummy{#1}}
\renewcommand{\sectionmark}[1]{\markboth{\thechapter. \dummy}{\thechapter. \dummy}}