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The question

How can we "translate" automatically chapters in book to lectures in Beamer to avoid the legitimate Undefined control sequence \chapter when compiling a presentation ?

The context

I have a very long presentation (~ 2000 frames) splitted in 20 lectures. Thanks to a beamerarticle and if 0\Article \documentclass{article} else \documentclass{beamer} at the beginning of my code, I manage to have a good process to compile, either in a form of an article or in a presentation.

My document had the following structure

  • Part 1
    • Section 1
    • Section 2
    • etc

It was working very well until I needed to restructure my document and realize a book (with chapters) made more sense.

  • Part 1
    • Chapter 1
      • Section 1
      • Section 2
    • Chapter 2
    • etc

Thanks to Lecture/chapters I understand the right "bridge" from book to Beamer (to avoid errors from Beamer not recognizing \chapters) would be to translate Chapters in book to Lectures in Beamer.

  • Part 1
    • Chapter 1 => Lecture 1
      • Section 1
      • Section 2
    • Chapter 2 => Lecture 2
    • etc

thanks for your help :)

3
  • I don't understand the code if 0\Article \documentclass{article} else \documentclass{beamer}. What is processing it? Not (La)TeX. Why not, in the else portion, include \let\chapter=\lecture? – Donald Arseneau Apr 7 '20 at 9:50
  • At the very beginning of the preambule, I defined \def\Article{1}. I decide whether I want an article (\Article{1}) and i load \documentclass{article} or a beamer (\Article{0}) \documentclass{beamer}. It worked well to switch from one to the other since both article and beamer mode have parts but no chapter. As for the \let\chapter=\lecture, does it mean all the \chapter will be interpeted as \lecture in beamer ? As simple as that ? :) – JeT Apr 7 '20 at 10:21
  • @DonaldArseneau Would not there be a problem using \let since \lecture{First Lecture}{firstChapter} requires 2 arguments ? – JeT Apr 7 '20 at 10:33
1

Typing as a comment was too messy. OK, so the document uses \if and \else and \fi, and LaTeX handles it; although the usage seems backwards (you probably meant \if 1\Article for \documentclass{article}).

Yeah, you no-doubt want to type \lecture in the document, and convert it to \chapter, rather than translating chapter => lecture, and not with \let. So

\def\Book{1}% or 0, or use optional.sty!
\if 1\Book
  \documentclass[your options]{book}% or scrbook etc.
  \newcommand\lecture[3][\shortlecname]{% 
    \def\shortlecname{#2}% default for TOC and header
    \chapter[#1]{#2}\label{#3}}
\else 
   \documentclass{beamer}
   \AtBeginLecture{ 
     blah blah a frame like a chapter
   }
\fi

Don't use \includeonlylecture. Then, in the document body

\lecture{Exciting stuff}{excite}
2
  • Merci Donald ! the code worked well but after a second compilation I go an ! LaTeX Error: Command \lecture already defined. Also, given the synthax \lecture{Exciting stuff}{excite}, should not it be \newcommand\lecture[3][\shortlecname]{ \def\shortlecname{#2} \chapter[#2]{#1}\label{#3}} ? – JeT Apr 8 '20 at 15:14
  • 1
    I can't guess where you have a double definition of \lecture. It does not happen in simple tests. And, no, it is \chapter[#1]{#2}\label{#3} That also covers the actual defined syntax with optional arguments (where #1 is the optional short name in both the lecture and the chapter case). I didn't know if you wanted to do anything with the third argument, so I used it for a \label. – Donald Arseneau Apr 8 '20 at 21:10

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