what could be the way for creating an environment from within a custom command. For example, something like this :
\NewDocumentCommand\mynewblock{m m m}{% pseudo code : % custom environment here with #1 corresponding to the name, #2 to the code "before" and #3 to the code after. } At first look, it may seem clumsy to do so, because a \NewDocumentEnvironment command allows to do this stuff ; but, for me, it may be useful indeed to hide the environment command to users... Thanks a lot.
My hunch is that you want to provide users with the possibility of defining their own “blocks” based on a common design. So you may want to have
both in the “begin” and “end” parts of the block.
\NewDocumentCommand{\NewBlock}{mmmm}{% % #1 = block name, #2 = list of argument types % #3 = begin part, #4 = end part \NewDocumentEnvironment{#1}{#2}{% %<fixed pre code for the begin part #3% %<fixed post code for the begin part }{% %<fixed pre code for the end part #4% %<fixed post code for the end part }% } A user will do, for instance,
\NewBlock{foo}{m}{AAA#1BBB}{CCC#1DDD} so to be able to call
\begin{foo}{x} Something here \end{foo} However, nothing can prohibit users to employ `\NewDocumentEnvironment themselves.
\NewDocumentCommand\mynewblock{m m m}{\NewDocumentEnvironment{#1}{}{#2}{#3}}.\NewDocumentCommand\mynewblock{m}{\NewDocumentEnvironment{#1}{}}?\NewDocumentCommandand friends currying is discouraged (also I expect OP to actually put more code inside that definition).