Expandiendo \thechapter inmediatamente

Question

Este es un derivado de otra pregunta que publiqué aquí.

\documentclass[8pt]{book}
\usepackage{etoolbox}
\usepackage{hyperref}

\newcommand{\mychapter}[1]{\chapter{#1} \hypertarget{chapter::\theHchapter}{}}
\newcommand{\refChapter}{\hyperlink{chapter::\theHchapter}{\thechapter}}

\newcommand{\addTimeline}[2]{%
  \ifcsname timeLine#1\endcsname
    \csappto{timeLine#1}{\unexpanded{\\& #2 & } \thechapter}%
  \else
    \csdef{timeLine#1}{\unexpanded{\\\textbf{#1} & #2 & } \thechapter}%
  \fi
}

\newcount\timelineCounter
\newcommand{\printTimeline}[2]{%
  \def\timelineData{}%
  \timelineCounter=#1\relax
  \loop \ifnum \timelineCounter<#2
    \edef\timelineData{\expandonce{\timelineData}\csuse{timeLine\the\timelineCounter}}%
    \advance \timelineCounter 1
  \repeat
\begin{tabular}{c p{7cm} c}
  \timelineData
\end{tabular}
}


\begin{document}

\mychapter{First}
 \addTimeline{4}{Event1}
 \addTimeline{19}{Event2}
 \addTimeline{2}{Event3}

\mychapter{Second} 
 \addTimeline{29}{Event4}
 \addTimeline{15}{Event5}
 \addTimeline{19}{Event6}

\mychapter{Timeline}
  \printTimeline{1}{30}


\end{document}

Esperaba que imprimiera dos capítulos vacíos seguidos de un Capítulo 3, llamado Línea de tiempo con

  2 Event3        1
  4 Event1        1
 15 Event5        2
 19 Event2        1
    Event6        2
 29 Event4        2

pero en cambio en la tercera columna obtengo los "3". En el escenario ideal, usaría \refChapterel comando que creé, en lugar del \thechapter, pero el primero no se compila. No tengo ni idea de cómo expandir este tipo de expresión. Se agradecería cualquier orientación.

Answer 1

Tienes que usar \cseapptoy \csedef, pero esto requiere otro \unexpandedalrededor de la parte que no deseas expandir:

\documentclass{book}
\usepackage{etoolbox}
\usepackage{hyperref}

\newcommand{\mychapter}[1]{\chapter{#1} \hypertarget{chapter::\theHchapter}{}}
\newcommand{\refChapter}{\hyperlink{chapter::\theHchapter}{\thechapter}}

\newcommand{\addTimeline}[2]{%
  \ifcsname timeLine#1\endcsname
    \cseappto{timeLine#1}{\unexpanded{\unexpanded{\\& #2 & }} \thechapter}%
  \else
    \csedef{timeLine#1}{\unexpanded{\unexpanded{\\\textbf{#1} & #2 & }} \thechapter}%
  \fi
}

\newcount\timelineCounter
\newcommand{\printTimeline}[2]{%
  \def\timelineData{}%
  \timelineCounter=#1\relax
  \loop \ifnum \timelineCounter<#2
    \edef\timelineData{\expandonce{\timelineData}\csuse{timeLine\the\timelineCounter}}%
    \advance \timelineCounter 1
  \repeat
\begin{tabular}{c p{7cm} c}
  \timelineData
\end{tabular}
}


\begin{document}

\mychapter{First}
 \addTimeline{4}{Event1}
 \addTimeline{19}{Event2}
 \addTimeline{2}{Event3}

\mychapter{Second} 
 \addTimeline{29}{Event4}
 \addTimeline{15}{Event5}
 \addTimeline{19}{Event6}

\mychapter{Timeline}
  \printTimeline{1}{30}


\end{document}

Lo mismo con expl3, pero con menos problemas con la expansión, porque podemos expandir \theHchaptery \thechaptercuando se está llamando a la macro principal.

\documentclass{book}
\usepackage{xparse}
\usepackage{hyperref}

\ExplSyntaxOn
\cs_set_eq:NN \latexchapter \chapter

% modify \chapter to add a hypertarget
\RenewDocumentCommand{\chapter}{sO{#3}m}
 {
  \IfBooleanTF{#1}
   {
    \latexchapter*{#3}
   }
   {
    \latexchapter[#2]{\hypertarget{chapter::\theHchapter}{#3}}
   }
 }

\NewDocumentCommand{\addTimeline}{smm}
 { % here \theHchapter and \thechapter are expanded prior to doing the hard work
  \benedict_timeline_add:xxnn { \IfBooleanF{#1}{\theHchapter} } { \thechapter } { #2 } { #3 }
 }

\cs_new_protected:Nn \benedict_timeline_add:nnnn
 {
  \tl_if_exist:cTF { l_benedict_timeline_#3_tl }
   { % the header has already appeared
    \tl_put_right:cn { l_benedict_timeline_#3_tl } { & #4 }
   }
   { % the header is new
    \tl_new:c { l_benedict_timeline_#3_tl }
    \tl_put_right:cn { l_benedict_timeline_#3_tl } { \textbf{#3} & #4 }
   }
  % now add the reference; #3 is the header
  % #1 and #2 are \theHchapter and \thechapter (expanded)
  \benedict_timeline_add_ref:nnn { #3 } { #1 } { #2 }
 }
\cs_generate_variant:Nn \benedict_timeline_add:nnnn { xx }

\cs_new_protected:Nn \benedict_timeline_add_ref:nnn
 {
  \tl_if_empty:nTF { #2 } % \theHchapter
   {% modify here for the formatting
    \tl_put_right:cn { l_benedict_timeline_#1_tl } { & \S #3 \\ }
   }
   {
    \tl_put_right:cn { l_benedict_timeline_#1_tl } { & \S \hyperlink{chapter::#2}{#3} \\ }
   }
 }

\NewDocumentCommand{\printTimeline}{mm}
 {
  \tl_clear:N \l__benedict_timeline_body_tl
  \int_step_inline:nnnn { #1 } { 1 } { #2 }
   {
    \tl_if_exist:cT { l_benedict_timeline_##1_tl }
     {
      \tl_put_right:Nv \l__benedict_timeline_body_tl { l_benedict_timeline_##1_tl }
     }
   }
  \begin{tabular}{c p{7cm} c}
  \tl_use:N \l__benedict_timeline_body_tl
  \end{tabular}
 }

\tl_new:N \l__benedict_timeline_body_tl
\cs_generate_variant:Nn \tl_put_right:Nn { Nv }
\ExplSyntaxOff

\begin{document}

\chapter{First}

\addTimeline{4}{Event1}
\addTimeline{19}{Event2}
\addTimeline{2}{Event3}

\chapter{Second} 

\addTimeline{29}{Event4}
\addTimeline{15}{Event5}
\addTimeline{19}{Event6}

\chapter{Timeline}

\printTimeline{1}{30}

\end{document}