Override All Header and Footer Styles for All Chapter Title and Content Pages?

Question

<sup>Closely Related:
- Create Separate Footer and Header for Chapter Title and Content Pages?</sup>

1. Use Case - Decoupling Layout from Content:

Content Authors will provide TeX content via a web portal, which will likely include \chapter{Chapter Title} and most probably footnote, math, image, and other TeX syntax.

However - it is often the case that the default chapter title page and chapter content page styles could be wrongfully specified by these authors, or get corrupted through other imports (\input, \include, \usepackage, etc.)

Clarification: A Chapter Title Page is the first page of a chapter. Chapter Content Pages are the remaining content pages of the chapter. This has nothing to do with a Table of Contents, but should not effect the ToC.

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2. Question:

With the Memoir, Book, or other document classes, is it possible to do what the related question is doing with the \xpatchcmd?

Is it possible to define and apply custom classes, only once, to affect all Chapter Title Pages and Chapter Content Pages, throughout an entire document, without all of the code repetition as seen in similar questions?

Goals:

1. To be able to define headers and footers for Chapter Title Pages and Chapter Content Pages separately, (which the current answer is limited from doing).
2. To eventually have separate custom styles for each Part in a book, (without worrying about default styles being corrupted.
3. Less code repetition.
4. Could override unwelcome customizations in imported documents.
5. To blacklist \xpatchcmd and any other patch commands from being used.

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3. Code Example:

\documentclass{memoir}

\usepackage{lipsum}

\makepagestyle{chapter}
    \makeheadrule{chapter}{\textwidth}{\normalrulethickness}
    \makefootrule{chapter}{\textwidth}{\normalrulethickness}{\footruleskip}
    \makeoddhead {chapter}{left header}{odd header}{right header}
    \makeoddfoot {chapter}{left footer}{odd footer}{right footer}
    % ***** Added in Even Page Headers and Footers to show on Chapter Content Pages
    \makeevenhead {chapter}{left header}{even header}{right header}
    \makeevenfoot {chapter}{left footer}{even footer}{right footer}


    \makepagestyle{alternate}
    \makeheadrule{alternate}{\textwidth}{\normalrulethickness}
    \makefootrule{alternate}{\textwidth}{\normalrulethickness}{\footruleskip}
    \makeoddhead {alternate}{left header}{alternate odd header}{right header}
    \makeoddfoot {alternate}{left footer}{alternate odd footer}{right footer}
    \makeevenhead {alternate}{left header}{alternate even header}{right header}
    \makeevenfoot {alternate}{left footer}{alternate even footer}{right footer}


\begin{document}

    % ***** What Memoir Code could go here, to override all
    % ***** chapter title and content pagestyles?
    % ***** How to specify all chapter Title and Content Pages
    % ***** ... without having to provide an actual chapter.
    % ***** ... \xpatch can do this, but does Memoir have a way?

    \chapter{Non-Styled Chapter}
    \chapterprecis{Ideally the only code would be the \\ include command.  Authors will only have TeX code specific to their own content - with no knowledge of current styles, etc.  There would be no "\\ pagestyle" commands in these \\ include -ed files.  Here, chapter content pages have no custom headers and footers.  }
    % \include("./Content/MyContent.text")
    \sloppy\lipsum

    \chapter{Test Chapter With required \\ pagestyle command}
        \chapterprecis{Required to use inner Styling to get Headers and Footers.}
        % **** Chapter Content Pages Need this \pagestyle command?
        \pagestyle{chapter}
        \sloppy\lipsum

    % ***** Every \chapter tag would reqire \chapterstyle, etc.
    % ***** Chapter Content will actually be pulled in via \include.
    \chapterstyle{bianchi}
    \chapter{Testing Bianchi Chapter Style}
        \chapterprecis{Built in Chapter Styles have no impact on headers and footers.%
        Have to resort to including \\ pagestyle in order to override possible%
        corruption of default \\ pagestyle\{chapter\} }

        \pagestyle{alternate}
        \sloppy\lipsum

    % ***** Bianchi Chapter Test 2, Without Style Tags
    \chapter{Non-Styled Chapter}
        \chapterprecis{Chapter Without Any Style Commands. Inherits globally altered changes.  This is what I am hoping to avoid.}
        \sloppy\lipsum

\end{document}

Answer 1

\xpatchcmd (from xpatch) has the same format/interface than its counterpart \patchcmd (from etoolbox):

\xpatchcmd{<cmd>}{<search>}{<replace>}{<success>}{<failure>}

\xpatchcmd searches for <search> in <cmd> and replaces it with <replace>. If this search-and-replace is successful, it executes <success>, otherwise it executes <failure>. In your code example (after removing the comments),

\xpatchcmd{\chapter}{\thispagestyle{chapter}}{}{}{}

searches for \thispagestyle{chapter} inside \chapter and replaces it with nothing. The <success> and <failure> branches are also left blank for brevity. Effectively, the above command removes \thispagestyle{chapter} from \chapter.

Secondly, you're confusing \chapterstyle with \pagestyle. They're different. A chapter style (defined using \makechapterstyle) is used with a call to \chapterstyle and defines the way the chapter heading/title is set, not the chapter page header/footer. The latter is called a page style and is created using \makepagestyle and used/set via \thispagestyle (for the current page only) or \pagestyle (for pages form the current on onward).

Here is a demonstration of the veelo chapter style, for example:

% ...
\setcounter{chapter}{3}% Just for this example
\chapterstyle{veelo}
\chapter{Demonstration of the veelo \\ chapter style}
\sloppy\lipsum
%...

The way the heading - Chapter 4 - and title - Demonstration of the veelo \\ chapter style - is set has been changed, but the page style is still chapter.

Here is a demonstration of applying the ChapterPage page style to the first pages of a \chapter under the madsen chapter style:

\documentclass{memoir}

\usepackage{lipsum,graphicx}

\makepagestyle{ChapterPage}
\makeheadrule{ChapterPage}{\textwidth}{\normalrulethickness}
\makefootrule{ChapterPage}{\textwidth}{\normalrulethickness}{\footruleskip}
\makeoddhead {ChapterPage}{left header}{centre header}{right header}
\makeoddfoot {ChapterPage}{left footer}{centre header}{right header}

\begin{document}

\tableofcontents

\clearpage
\copypagestyle{chapter}{ChapterPage}
\setcounter{chapter}{3}% Just for this example
\chapterstyle{madsen}
\chapter{Demonstration of the madsen \\ chapter style}
\sloppy\lipsum

\end{document}

---

By default the first page of a \chapter is given \thispagestyle{chapter} (see memoir documentation, section 7.2 Page styles) and the chapter page style is a copy - actually an alias - of plain (see section 7.3 Making headers and footers).

You first have to fully create the chapter page style, either as a completely new style (via \makepagestyle{chapter}) or as a copy of some other style (like \copypagestyle{chapter}).

Then you can change the style to suit your needs:

\makepagestyle{chapter}% Officially create the chapter page style
\makeheadrule{chapter}{<width>}{<thickness>}% Header rule specification
\makefootrule{chapter}{<width>}{<thickness>}{<skip>}% Footer rule specification
\makeevenhead{chapter}{<left>}{<centre>}{<right>}% Even header
\makeoddhead {chapter}{<left>}{<centre>}{<right>}% Odd header
\makeevenfoot{chapter}{<left>}{<centre>}{<right>}% Even footer
\makeoddfoot {chapter}{<left>}{<centre>}{<right>}% Odd footer

Here is a complete minimal example highlighting the procedure:

\documentclass{memoir}

\usepackage{lipsum}

% This creates (and overrides) the chapter page style - set on the 
% first page of a \chapter
\makepagestyle{chapter}
\makeheadrule{chapter}{\textwidth}{\normalrulethickness}
\makefootrule{chapter}{\textwidth}{\normalrulethickness}{\footruleskip}
\makeoddhead {chapter}{left header}{chapter odd header}{right header}
\makeoddfoot {chapter}{left footer}{chapter odd footer}{right footer}
\makeevenhead{chapter}{left header}{chapter even header}{right header}
\makeevenfoot{chapter}{left footer}{chapter even footer}{right footer}

% This is everything else - set on "chapter content" pages
\makepagestyle{alternate}
\makeheadrule{alternate}{\textwidth}{\normalrulethickness}
\makefootrule{alternate}{\textwidth}{\normalrulethickness}{\footruleskip}
\makeoddhead {alternate}{left header}{alternate odd header}{right header}
\makeoddfoot {alternate}{left footer}{alternate odd footer}{right footer}
\makeevenhead{alternate}{left header}{alternate even header}{right header}
\makeevenfoot{alternate}{left footer}{alternate even footer}{right footer}

\pagestyle{alternate}

\begin{document}

\sloppy% Just for this example

\chapter{Non-Styled Chapter}
\chapterprecis{Ideally the only code would be the \texttt{\string\include} command.
  Authors will only have TeX code specific to their own content - with no knowledge of current styles, 
  \textit{etc.} There would be no ``\texttt{\string\pagestyle}'' commands in these \texttt{\string\include}-ed files.
  Here, chapter content pages have no custom headers and footers.}
\lipsum

\chapter{Test Chapter With required \texttt{\string\pagestyle} command}
\chapterprecis{Required to use inner Styling to get Headers and Footers.}
\lipsum

\chapterstyle{bianchi}
\chapter{Testing Bianchi Chapter Style}
\chapterprecis{Built in Chapter Styles have no impact on headers and footers.%
  Have to resort to including \texttt{\string\pagestyle} in order to override possible%
  corruption of default \texttt{\string\pagestyle\string{chapter\string}}}
\lipsum

\chapter{Non-Styled Chapter}
\chapterprecis{Chapter Without Any Style Commands. Inherits globally altered changes.
  This is what I am hoping to avoid.}
\lipsum

\end{document}