\usepackage for \newenvironment

Question

I am trying to create a package called lessonPlanner in which I declare some new environments via \newenvironment

So I have something like

... mwe.tex

\usepackage{lessonPlanner}
\begin{document}

.... In my file "lessonPlanner.sty" I have

\newenvironment{unitPlan}[1]{}Hello World{}

.....

But LaTeX complains that I am missing a \begin{document} when it tries to parse the \newenvironment{unitPlan} definition.

So it seems I have something wrong, I would have though that all \newenvironment commands would be defined in the new packages.

P.S. I am trying to build my own package for lesson planning, where the lessons formats are defined the \usepackage{lessonPlanner} and only the content is referred to in the LaTeX document.

Answer 1

Your use of \newenvironment is incorrect. It should be

\newenvironment{<env>}[<args>][<opt arg>]
  {<begin env>}
  {<end env>}

If you place any content between {<begin env>} and {<end env>}, TeX will take the first token as the end (H in this case), leaving the rest as text that should possibly be set. And, of course, in the preamble, you cannot have this, since text is only set after \begin{document}. That gives rise to your error of "Missing \begin{document}".

Most likely your definition should resemble

\newenvironment{unitPlan}[1]
  {Hello World}% \begin{unitPlan}
  {}% \end{unitPlan}