Re: Major and minor modes

[Eli Zaretskii <eliz@gnu.org>]

> From: Jean-Christophe Helary <jean.christophe.helary@gmail.com>
> Date: Thu, 15 Jun 2017 06:58:07 +0900
> 
> PDF Chapter 2 "Characters, Keys and Commands" has:
> [introductory text about the chapter]
> 2.1 Kinds of User Input
> 2.2 Keys
> 2.3 Keys and Commands
> 
> but the HTML has:
> • 2 Kinds of User Input
> • 3 Keys
> • 4 Keys and Commands

Ah, that...  It's because the manual does this:

  @ifnottex
  @raisesections
  @end ifnottex

So when you later have this:

  @node User Input
  @section Kinds of User Input

The @section gets rendered as a chapter in on-line formats (Info and
HTML), and as a section in printed formats.

IOW, a book requires somewhat different considerations wrt its
sectioning than an on-line version of the manual.

> So in the HTML, PDF sub-chapters are chapters on their own and the introductory text is not present:
> "This chapter explains the character sets used by Emacs for input commands, and the fundamental concepts of keys and commands, whereby Emacs interprets your keyboard and mouse input."

That introductory text is conditionally included only in the printed
formats:

  @iftex
  @chapter Characters, Keys and Commands

    This chapter explains the character sets used by Emacs for input
  commands, and the fundamental concepts of @dfn{keys} and
  @dfn{commands}, whereby Emacs interprets your keyboard and mouse
  input.
  @end iftex

> Then PDF has:
> 32 Emacs Lisp Packages................................. 431
> 33 Customization ...................................... 436
> 34 Dealing with Common Problems ....................... 468
> 
> And that chapter 34 corresponds to HTML
> • 52 Quitting and Aborting
> • 53 Dealing with Emacs Trouble
> • 54 Reporting Bugs
> • 55 Contributing to Emacs Development
> • 56 How To Get Help with GNU Emacs
> 
> That discrepancy is a bit weird.

Is it still weird?