Conditional header appearance based on chapter name

Question

I am converting a complex markdown document to pdf using pandoc. And need to add some formatting to it during the conversion. So I cannot have the styling and the data at the same place, means, I cannot do a target style assignment with something like thispagestyle. How can I make a general conditional headersfooters for some pages?
What I can think of now for removing header on the pages with table of content is below. It is not working for some reason.
(for this case fancyhead[C]{textsl{leftmark}} would set the word 'CONTENTS' in the header of this page).
usepackage{fancyhdr}
usepackage{ifthen}
pagestyle{fancy}
... 
some general header/footer style 
...
fancyheadinit{
    ifthenelse{equal{leftmark}{Contents} OR equal{leftmark}{CONTENTS}}
        {
          fancyhf{}
          {fancyhead[C]{textsl{rightmark}}}
          renewcommand{headrulewidth}{0pt}
        }
}

Werner · Answer

Here is a thought process for a solution:

Capture the chapter name/title in something like chaptername by redefining chapter.

Look up with the chapter name of the ToC actually looks like in the class you use (I've looked at book.cls and report.cls which are both the same; it may be different for other document classes). Store that in ToCchaptername.

Compare the current chaptername against ToCchaptername to condition on what you (don't) set.

The following example does that, leaving the ToC without any heading at all.
documentclass{book}

usepackage{fancyhdr,lipsum}

% Capture the chapter name/title in chaptername
makeatletter
letoldchapterchapter
RenewDocumentCommand{chapter}{s o m}{%
  cleardoublepage
  IfBooleanTF{#1}
    {oldchapter*{#3}defchaptername{#3}}% chapter*{...}
    {IfValueTF{#2}
      {oldchapter[#2]{#3}defchaptername{#2}}% chapter[..]{...}
      {oldchapter{#3}defchaptername{#3}}}% chapter{...}
  markright{}% Clear possible section mark left by ToC
}
% Taken from https://www.tug.org/svn/texlive/trunk/Master/texmf-dist/tex/latex/base/book.cls?view=co
defToCchaptername{contentsname @mkboth{%
  MakeUppercasecontentsname}{MakeUppercasecontentsname}}
makeatother
  
pagestyle{fancy}
fancyheadinit{%
  fancyhf{}% Remove header/footer
  renewcommand{headrulewidth}{0pt}% Remove header rule
  % Compare chapter title/name to that of ToC
  ifxchapternameToCchaptername
    % What to do when you're in the ToC
  else
    % What to do when you're not in the ToC
    fancyhead[C]{textsl{rightmark}}
  fi
}

begin{document}

sloppy
tableofcontents

chapter{First chapter}lipsum[1-10]
section{First section}lipsum[11-20]
section{Second section}lipsum[21-30]
section{Third section}lipsum[31-40]
section{Final section}lipsum[41-50]

chapter{Second chapter}lipsum[1-10]
section{First section}lipsum[11-20]
section{Second section}lipsum[21-30]
section{Third section}lipsum[31-40]
section{Final section}lipsum[41-50]

chapter{Third chapter}lipsum[1-10]
section{First section}lipsum[11-20]
section{Second section}lipsum[21-30]
section{Third section}lipsum[31-40]
section{Final section}lipsum[41-50]

chapter{Final chapter}lipsum[1-10]
section{First section}lipsum[11-20]
section{Second section}lipsum[21-30]
section{Third section}lipsum[31-40]
section{Final section}lipsum[41-50]

end{document}

A small edge-case had to be considered (because you're setting rightmark) since the ToC sets both left/right header to be contentsname. So, if the first chapter after the ToC has a long introduction (spilling onto a second page) before the first section (and therefore rightmark) is set, you could be in a new chapter and set the word contentsline as part of rightmark. As such, we clear the rightmark when we call chapter (via markright{}).

Conditional header appearance based on chapter name

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