secnum (29aug21)

git-svn-id: svn://tug.org/texlive/trunk@60365 c570f23f-e606-0410-a88d-b1316a301751

5 files changed, 435 insertions, 71 deletions

diff --git a/Master/texmf-dist/doc/latex/secnum/README.md b/Master/texmf-dist/doc/latex/secnum/README.md
index 9ee10bcae85..48a2b3117da 100644
--- a/Master/texmf-dist/doc/latex/secnum/README.md
+++ b/Master/texmf-dist/doc/latex/secnum/README.md
@@ -1,12 +1,20 @@
 
 # secnum
 
-This package provides a macro \setsecnum to format section numbering intuitively.
+This package provides a macro `\setsecnum` to format section numbering intuitively.
 
 ## Usage
 
-One can simply use `\setsecnum{1.1.1}` to set the section numbering
-format as `arabic.arabic.arabic` and depth to be 3.
+One can simply use `\setsecnum{A,1.i}` to set the section numbering
+format as `Alph` for the sections, `arabic` for the subsections and
+`arabic.roman` for the subsubsections and
+the `secnumdepth` and `tocdepth` will be 3.
+
+If one want to set the tocdepth manually,
+there is an option `tocdep` for it.
+
+One may notice that the comma `,` plays a special role in the numbering format:
+for deep levels, the numbering before the comma are hided.
 
 ## Installation
 
@@ -16,7 +24,7 @@ The installation is the same as usual Tex packages.
 
 1. Run the following to create the package file `secnum.sty` (as well as this file `README.md`)
 
-       XeTeX secnum.dtx
+       pdfTeX secnum.dtx
 
 2. Move the following file into proper directories searched by TeX.
    The recommended directory is
@@ -25,7 +33,7 @@ The installation is the same as usual Tex packages.
 
 3. To produce the documentation run the following
 
-       XeLaTeX secnum.dtx
+       pdfLaTeX secnum.dtx
 
 4. The recommended directory for the documentation is
 
diff --git a/Master/texmf-dist/doc/latex/secnum/secnum.pdf b/Master/texmf-dist/doc/latex/secnum/secnum.pdf
index 101df250f95..de3f9929b98 100644
--- a/Master/texmf-dist/doc/latex/secnum/secnum.pdf
+++ b/Master/texmf-dist/doc/latex/secnum/secnum.pdf
diff --git a/Master/texmf-dist/source/latex/secnum/secnum.dtx b/Master/texmf-dist/source/latex/secnum/secnum.dtx
index 1220b7ec59b..b8309f8c4d4 100644
--- a/Master/texmf-dist/source/latex/secnum/secnum.dtx
+++ b/Master/texmf-dist/source/latex/secnum/secnum.dtx
@@ -29,12 +29,20 @@
 
 # secnum
 
-This package provides a macro \setsecnum to format section numbering intuitively.
+This package provides a macro `\setsecnum` to format section numbering intuitively.
 
 ## Usage
 
-One can simply use `\setsecnum{1.1.1}` to set the section numbering
-format as `arabic.arabic.arabic` and depth to be 3. 
+One can simply use `\setsecnum{A,1.i}` to set the section numbering
+format as `Alph` for the sections, `arabic` for the subsections and 
+`arabic.roman` for the subsubsections and 
+the `secnumdepth` and `tocdepth` will be 3. 
+
+If one want to set the tocdepth manually, 
+there is an option `tocdep` for it.
+
+One may notice that the comma `,` plays a special role in the numbering format:
+for deep levels, the numbering before the comma are hided.
 
 ## Installation
 
@@ -44,7 +52,7 @@ The installation is the same as usual Tex packages.
 
 1. Run the following to create the package file `secnum.sty` (as well as this file `README.md`)
 
-       XeTeX secnum.dtx
+       pdfTeX secnum.dtx
 
 2. Move the following file into proper directories searched by TeX.
    The recommended directory is
@@ -53,7 +61,7 @@ The installation is the same as usual Tex packages.
 
 3. To produce the documentation run the following
 
-       XeLaTeX secnum.dtx
+       pdfLaTeX secnum.dtx
 
 4. The recommended directory for the documentation is
 
@@ -135,8 +143,8 @@ The Current Maintainer of this work is
 \usepackage{indentfirst}
 \usepackage{booktabs}
 \usepackage{xcolor}
-\usepackage{secnum}
-\setsecnum{A}
+\usepackage[tocdep=2]{secnum}
+\setsecnum{A,1.i}
 \ExplSyntaxOn
 \cs_set_eq:NN \__codedoc_macro_end_style:n \use_none:n
 \ExplSyntaxOff
@@ -168,20 +176,31 @@ The Current Maintainer of this work is
 %
 % \tableofcontents
 % \begin{documentation}
+%
+% \section{Example}
+%    This document uses the following setting of section numbering format.
+%  \begin{verbatim}
+%    \usepackage[tocdep=2]{secnum}
+%    \setsecnum{A,1.i}
+%  \end{verbatim}
+%
 % \section{Usage}
 %   Before using the macro, load the package in preamble.
 %  \begin{verbatim}
-%  \usepackage{secnum}
+%    \usepackage{secnum}
 %  \end{verbatim}
-%   Then, one can format the section numbering by using the 
+%
+% \subsection{Set numbering format} 
+%   One can format the section numbering by using the 
 %   marco \cs{setsecnum} in preamble.
 %  \begin{function}{\setsecnum}
 %  \begin{syntax}
 %    \cs{setsecnum}\marg{num format}
 %  \end{syntax}
+%
 %    A typical \meta{num format} is like this:
 %  \begin{center}
-%    \verb|1.1.1|
+%    \verb|A,1.i|
 %  \end{center}
 %    It consists of some syntax abbrs of numbering formats, 
 %    reffering the follows,
@@ -194,28 +213,87 @@ The Current Maintainer of this work is
 %    \bottomrule
 %   \end{tabular}
 %  \end{center}
-%   and some separators, which can be any character except 
-%   the abbrs and special characters such as barces ``\verb|{}|'', 
-%   comma ``\verb|,|'', space ``\verb*| |'', etc.
+%   and some separators delimiting them. 
+%
+%   The separators can be any character except above abbrs, 
+%   the tokens ``\verb|{|'', ``\verb|}|'' and ``\verb|#|''
+%   (more precisely, explicit character tokens with category code
+%   1 (begin-group) or 2 (end-group), and tokens with category code 6) and the space ``\verb*| |''.
+%
+%   Note that \meta{num format} must end with an abbr.
+%
+%    \begin{texnote}
+%      This command will overwrite 
+%      \opt{secnumdepth} and \opt{tocdepth}
+%    \end{texnote}
+%  \end{function}
+%  
+% \subsection{Breaking the numbering}
+%    The comma ``\verb|,|'' in above example is used as the breaking mark:
+%    for deep levels (in our case, deeper than sections), 
+%    the numbering before ``\verb|,|'' will be hided.
+%
+%    Note that the breaking mark must immediately follows an abbr.
+%
+% \subsection{Package options}
+% \subsubsection{tocdep}
+%   There is an option setting \opt{tocdepth}, the table-of-contents depth manually.
+%  \begin{function}{ tocdep }
+%    \begin{syntax}
+%      \opt{tocdep} = \meta{integer}
+%    \end{syntax}
+%
+%    The \meta{integer} refers to the table-of-contents depth, 
+%    which should between $1$ and $5$. 
+%
+%    \begin{texnote}
+%      If this option is used, then \cs{setsecnum} will not overwrite \opt{tocdepth}.
+%    \end{texnote}
+%  \end{function}
+%
+% \subsubsection{breaking}
+%    Another option is used to change the breaking mark.
+%  \begin{function}{ breaking }
+%    \begin{syntax}
+%      \opt{breaking} = \meta{token}
+%    \end{syntax}
+%
+%    The \meta{token} will be the breaking mark 
+%    (the default is the comma ``\verb|,|''). 
+%    It can be any character except above abbrs, 
+%    the tokens ``\verb|{|'', ``\verb|}|'' and ``\verb|#|''
+%    (more precisely, explicit character tokens with category code
+%    1 (begin-group) or 2 (end-group), and tokens with category code 6) and the space ``\verb*| |''.
 %  \end{function}
 %
 % \section{Process}
 %   The process of the macro \cs{setsecnum} can be 
 %   explained as follows.
 % \begin{enumerate}[label=Step \arabic*.]
-%   \item The main function eats the input, saying \opt{I.1.a}, 
+%   \item The main function eats the input, saying \opt{A,1.i}, 
 %         and stores it in a token list.
 %   \item Replace abbrs by macros.
 %         In our example, it results 
-%         ``\cs{Roman}\opt{.}\cs{arabic}\opt{.}\cs{alph}''
+%         ``\cs{Alph}\opt{,}\cs{arabic}\opt{.}\cs{roman}''
 %   \item Split this token list into a sequence by macros. 
-%         In our example, it results ``\cs{Roman}'', 
-%         ``\opt{.}\cs{arabic}'' and ``\opt{.}\cs{alph}''.
+%         In our example, it results ``\cs{Alph}'', 
+%         ``\opt{,}\cs{arabic}'' and ``\opt{.}\cs{roman}''.
 %   \item Store those codes in indivial containers.
-%   \item Use them to renew \cs{thesection}, \cs{thesubsection}, 
+%   \item Detect if there is \cs{thechapter}. 
+%         Skip the chapter level if not.
+%         In our example, this is the case. 
+%   \item Use the containers to redefine 
+%         \cs{thesection}, \cs{thesubsection}, 
 %         \cs{thesubsubsection} etc. 
-%         provided there is no \cs{chapter}.
+%         In each step, detect if such level needs numbering and
+%         if there is a breaking mark in the container.
+%         In our example, the numbering formats will be redefined as 
 % \end{enumerate}
+%  \begin{verbatim}
+%    \renewcommand*{\thesection}{\Alph{section}}
+%    \renewcommand*{\thesubsection}{\arabic{subsection}}
+%    \renewcommand*{\thesubsubsection}{thesubsection.\roman{subsubsection}}
+%  \end{verbatim}
 %   
 % \end{documentation}
 %
@@ -227,7 +305,7 @@ The Current Maintainer of this work is
 %   Users can ignore.
 % \subsection{Preparations}
 %   This package uses \LaTeX3. 
-%   Therefore, the packages \pkg{expl3} and \pkg{xparse}
+%   Therefore, the packages \pkg{expl3}, \pkg{xparse} and \pkg{l3keys2e}
 %   are needed and should use 
 %   \cs{ProvidesExplPackage} rather than \cs{ProvidesPackage}.
 %
@@ -236,16 +314,17 @@ The Current Maintainer of this work is
 %<@@=syu>
 \NeedsTeXFormat{LaTeX2e}
 \RequirePackage{expl3}
-\ProvidesExplPackage{secnum}{2020/02/02}{}
+\ProvidesExplPackage{secnum}{2021/08/28}{}
   { An intuitive way to format section numbering }
-\RequirePackage{xparse}
+\RequirePackage{xparse,l3keys2e}
 %    \end{macrocode}
 %
 %  \begin{variable}{ \l__syu_secnum_tl, \l__syu_secnum_seq }
-%   The two variables are used to store the formatting information.
+%   The variables are used to store the formatting information.
 %    \begin{macrocode}
 \tl_new:N \l__syu_secnum_tl
 \seq_new:N \l__syu_secnum_seq
+\int_new:N \l__syu_secnum_depth
 %    \end{macrocode}
 %  \end{variable}
 %
@@ -287,8 +366,57 @@ The Current Maintainer of this work is
 %    \end{macrocode}
 %  \end{variable}
 %
+%  \begin{variable}{ \l__syu_secnum_bkm }
+%   This variable is used to store the breaking mark.
+%    \begin{macrocode}
+\tl_new:N \g__syu_secnum_bkmr
+\tl_gset:Nx \g__syu_secnum_bkmr {,}
+%    \end{macrocode}
+%   Note that one needs the following variants
+%    \begin{macrocode}
+\cs_generate_variant:Nn \tl_if_in:NnTF { NV }
+\cs_generate_variant:Nn \tl_remove_all:Nn { NV }
+%    \end{macrocode}
+%  \end{variable}
+%
+%   \changes{2020/01/12}{2020/01/12}{Add package option to set \opt{tocdepth}.}
+% \subsection{Package option}
+%    \begin{macrocode}
+\keys_define:nn { syu / options }
+  {
+%    \end{macrocode}
+%
+%  \begin{macro}{ tocdep }
+%   Set the table-of-contents depth.
+%    \begin{macrocode}
+    tocdep .code:n = 
+      { 
+        \int_const:Nn \g__syu_tocdep {#1} 
+        \setcounter{tocdepth}{ \g__syu_tocdep }
+      },
+%    \end{macrocode}
+%  \end{macro}
+%
+%  \begin{macro}{ breaking }
+%   Set the breaking mark used in \meta{num format}.
+%    \begin{macrocode}
+    breaking .code:n = 
+      { 
+        \tl_gset:Nx \g__syu_secnum_bkmr {#1} 
+      },
+%    \end{macrocode}
+%  \end{macro}
+%
+%    \begin{macrocode}
+  }
+%    \end{macrocode}
+%
+%   Passing keys to options.
+%    \begin{macrocode}
+\ProcessKeysOptions{ syu / options }
+%    \end{macrocode}
+%
 % \subsection{Main function}
-% 
 %  \begin{macro}{\setsecnum}
 %   Here is the definition of the main function \cs{setsecnum}.
 %    \begin{macrocode}
@@ -314,8 +442,30 @@ The Current Maintainer of this work is
 %   Set the \opt{secnumdepth} and \opt{tocdepth}.
 %   \changes{2020/01/12}{2020/01/12}{Add codes to set \opt{tocdepth}.}
 %    \begin{macrocode}
-    \setcounter{secnumdepth}{ \seq_count:N \l__syu_secnum_seq }
-    \setcounter{tocdepth}{ \seq_count:N \l__syu_secnum_seq }
+    \int_set:Nn \l__syu_secnum_depth 
+      {  
+        \seq_count:N \l__syu_secnum_seq
+      }
+    \setcounter{secnumdepth}
+      { 
+        \int_eval:n 
+          { 
+            \l__syu_secnum_depth - \g__syu_if_thechapter_int 
+          } 
+      }
+    \int_if_exist:NTF \g__syu_tocdep 
+      {
+        \setcounter{tocdepth}{ \g__syu_tocdep }
+      }
+      {
+        \setcounter{tocdepth}
+          { 
+            \int_eval:n 
+              { 
+                \l__syu_secnum_depth - \g__syu_if_thechapter_int 
+              } 
+          }
+      }
 %    \end{macrocode}
 %   Format numberings.
 %    \begin{macrocode}
@@ -434,14 +584,28 @@ The Current Maintainer of this work is
 \cs_new:Nn \__syu_secnum: 
   {
 %    \end{macrocode}
+% \subsubsection{Detect if there is \cs{thechapter}}\noindent
 %   When \cs{thechapter} is defined, start from it.
 %    \begin{macrocode}
     \if_cs_exist:N \thechapter
       \renewcommand*{\thechapter}
         { \g__syu_chapter_tl {chapter} }
-      \renewcommand*{\thesection}
-        { \thechapter
-          \g__syu_section_tl {section} }
+%    \end{macrocode}
+%   Test if the numbering breaks before section.
+%    \begin{macrocode}
+    \tl_if_in:NVTF \g__syu_section_tl \g__syu_secnum_bkmr
+      {
+        \tl_remove_all:NV \g__syu_section_tl \g__syu_secnum_bkmr
+        \renewcommand*{\thesection}
+          { \g__syu_section_tl {section} }
+      }
+      {
+        \renewcommand*{\thesection}
+          { 
+            \thechapter
+            \g__syu_section_tl {section} 
+          }
+      }
 %    \end{macrocode}
 %   Otherwise start from \cs{thesection}.
 %    \begin{macrocode}
@@ -450,21 +614,107 @@ The Current Maintainer of this work is
         { \g__syu_section_tl {section} }
     \fi:
 %    \end{macrocode}
-%   The rest levels.
-%    \begin{macrocode}
-      \renewcommand*{\thesubsection}
-        { \thesection
-          \g__syu_subsection_tl {subsection} }
-      \renewcommand*{\thesubsubsection}
-        { \thesubsection
-          \g__syu_subsubsection_tl {subsubsection} }
-      \renewcommand*{\theparagraph}
-        { \thesubsubsection
-          \g__syu_paragraph_tl {paragraph} }
-      \renewcommand*{\thesubparagraph}
-        { \theparagraph
-          \g__syu_subparagraph_tl {subparagraph} }
-  }
+%
+%   \changes{2021/08/28}{2021/08/28}{The usage of breaking commas}
+% \subsubsection{Subsections}\noindent
+%   Test if the subsections are needed to be numbered.
+%    \begin{macrocode}
+    \tl_if_empty:NTF \g__syu_subsection_tl
+      {}
+      {
+%    \end{macrocode}
+%   Test if the numbering breaks before subsection.
+%    \begin{macrocode}
+        \tl_if_in:NVTF \g__syu_subsection_tl \g__syu_secnum_bkmr
+          {
+            \tl_remove_all:NV \g__syu_subsection_tl \g__syu_secnum_bkmr
+            \renewcommand*{\thesubsection}
+              { \g__syu_subsection_tl {subsection} }
+          }
+          {
+            \renewcommand*{\thesubsection}
+              { 
+                \thesection
+                \g__syu_subsection_tl {subsection} 
+              }
+          }
+      }
+%    \end{macrocode}
+%
+% \subsubsection{Subsubsections}\noindent
+%   Test if the subsubsections are needed to be numbered.
+%    \begin{macrocode}
+    \tl_if_empty:NTF \g__syu_subsubsection_tl
+      {}
+      {
+%    \end{macrocode}
+%   Test if the numbering breaks before subsubsection.
+%    \begin{macrocode}
+        \tl_if_in:NVTF \g__syu_subsubsection_tl \g__syu_secnum_bkmr
+          {
+            \tl_remove_all:NV \g__syu_subsubsection_tl \g__syu_secnum_bkmr
+            \renewcommand*{\thesubsubsection}
+              { \g__syu_subsubsection_tl {subsubsection} }
+          }
+          {
+            \renewcommand*{\thesubsubsection}
+              { 
+                \thesubsection
+                \g__syu_subsubsection_tl {subsubsection} 
+              }
+          }
+      }
+%    \end{macrocode}
+%
+% \subsubsection{Paragraphs}\noindent
+%   Test if the paragraphs are needed to be numbered.
+%    \begin{macrocode}
+    \tl_if_empty:NTF \g__syu_paragraph_tl
+      {}
+      {
+%    \end{macrocode}
+%   Test if the numbering breaks before paragraph.
+%    \begin{macrocode}
+        \tl_if_in:NVTF \g__syu_paragraph_tl \g__syu_secnum_bkmr
+          {
+            \tl_remove_all:NV \g__syu_paragraph_tl \g__syu_secnum_bkmr
+            \renewcommand*{\theparagraph}
+              { \g__syu_paragraph_tl {paragraph} }
+          }
+          {
+            \renewcommand*{\theparagraph}
+              { 
+                \thesubsubsection
+                \g__syu_paragraph_tl {paragraph} 
+              }
+          }
+      }
+%    \end{macrocode}
+%
+% \subsubsection{Subparagraphs}\noindent
+%   Test if the subparagraphs are needed to be numbered.
+%    \begin{macrocode}
+    \tl_if_empty:NTF \g__syu_subparagraph_tl
+      {}
+      {
+%    \end{macrocode}
+%   Test if the numbering breaks before paragraph.
+%    \begin{macrocode}
+        \tl_if_in:NVTF \g__syu_subparagraph_tl \g__syu_secnum_bkmr
+          {
+            \tl_remove_all:NV \g__syu_subparagraph_tl \g__syu_secnum_bkmr
+            \renewcommand*{\thesubparagraph}
+              { \g__syu_subparagraph_tl {subparagraph} }
+          }
+          {
+            \renewcommand*{\thesubparagraph}
+              { 
+                \theparagraph
+                \g__syu_subparagraph_tl {subparagraph} 
+              }
+          }
+      }
+   }
 %    \end{macrocode}
 %  \end{variable}
 %
@@ -477,4 +727,4 @@ The Current Maintainer of this work is
 % \changes{2020/01/01}{2020/01/01}{Correct the package name.}
 %
 % \Finale
-\endinput
\ No newline at end of file
+\endinput
diff --git a/Master/texmf-dist/tex/latex/secnum/secnum.sty b/Master/texmf-dist/tex/latex/secnum/secnum.sty
index 20f75a0c800..bd0a623efda 100644
--- a/Master/texmf-dist/tex/latex/secnum/secnum.sty
+++ b/Master/texmf-dist/tex/latex/secnum/secnum.sty
@@ -30,11 +30,12 @@
 %% 
 \NeedsTeXFormat{LaTeX2e}
 \RequirePackage{expl3}
-\ProvidesExplPackage{secnum}{2020/02/02}{}
+\ProvidesExplPackage{secnum}{2021/08/28}{}
   { An intuitive way to format section numbering }
-\RequirePackage{xparse}
+\RequirePackage{xparse,l3keys2e}
 \tl_new:N \l__syu_secnum_tl
 \seq_new:N \l__syu_secnum_seq
+\int_new:N \l__syu_secnum_depth
 \tl_new:N \g__syu_chapter_tl
 \tl_new:N \g__syu_section_tl
 \tl_new:N \g__syu_subsection_tl
@@ -47,14 +48,53 @@
 \else:
   \int_gset:Nn \g__syu_if_thechapter_int 0
 \fi:
+\tl_new:N \g__syu_secnum_bkmr
+\tl_gset:Nx \g__syu_secnum_bkmr {,}
+\cs_generate_variant:Nn \tl_if_in:NnTF { NV }
+\cs_generate_variant:Nn \tl_remove_all:Nn { NV }
+\keys_define:nn { syu / options }
+  {
+    tocdep .code:n =
+      {
+        \int_const:Nn \g__syu_tocdep {#1}
+        \setcounter{tocdepth}{ \g__syu_tocdep }
+      },
+    breaking .code:n =
+      {
+        \tl_gset:Nx \g__syu_secnum_bkmr {#1}
+      },
+  }
+\ProcessKeysOptions{ syu / options }
 \DeclareDocumentCommand{\setsecnum}{m}
   {
     \tl_set:Nn \l__syu_secnum_tl {#1}
     \__syu_secnum_unabbr:N \l__syu_secnum_tl
     \__syu_split_by_macros:NN \l__syu_secnum_tl \l__syu_secnum_seq
     \__syu_secnum_from_seq:N \l__syu_secnum_seq
-    \setcounter{secnumdepth}{ \seq_count:N \l__syu_secnum_seq }
-    \setcounter{tocdepth}{ \seq_count:N \l__syu_secnum_seq }
+    \int_set:Nn \l__syu_secnum_depth
+      {
+        \seq_count:N \l__syu_secnum_seq
+      }
+    \setcounter{secnumdepth}
+      {
+        \int_eval:n
+          {
+            \l__syu_secnum_depth - \g__syu_if_thechapter_int
+          }
+      }
+    \int_if_exist:NTF \g__syu_tocdep
+      {
+        \setcounter{tocdepth}{ \g__syu_tocdep }
+      }
+      {
+        \setcounter{tocdepth}
+          {
+            \int_eval:n
+              {
+                \l__syu_secnum_depth - \g__syu_if_thechapter_int
+              }
+          }
+      }
     \__syu_secnum:
   }
 \cs_new_protected:Npn \__syu_secnum_unabbr:N #1
@@ -115,26 +155,92 @@
     \if_cs_exist:N \thechapter
       \renewcommand*{\thechapter}
         { \g__syu_chapter_tl {chapter} }
-      \renewcommand*{\thesection}
-        { \thechapter
-          \g__syu_section_tl {section} }
+    \tl_if_in:NVTF \g__syu_section_tl \g__syu_secnum_bkmr
+      {
+        \tl_remove_all:NV \g__syu_section_tl \g__syu_secnum_bkmr
+        \renewcommand*{\thesection}
+          { \g__syu_section_tl {section} }
+      }
+      {
+        \renewcommand*{\thesection}
+          {
+            \thechapter
+            \g__syu_section_tl {section}
+          }
+      }
     \else:
       \renewcommand*{\thesection}
         { \g__syu_section_tl {section} }
     \fi:
-      \renewcommand*{\thesubsection}
-        { \thesection
-          \g__syu_subsection_tl {subsection} }
-      \renewcommand*{\thesubsubsection}
-        { \thesubsection
-          \g__syu_subsubsection_tl {subsubsection} }
-      \renewcommand*{\theparagraph}
-        { \thesubsubsection
-          \g__syu_paragraph_tl {paragraph} }
-      \renewcommand*{\thesubparagraph}
-        { \theparagraph
-          \g__syu_subparagraph_tl {subparagraph} }
-  }
+    \tl_if_empty:NTF \g__syu_subsection_tl
+      {}
+      {
+        \tl_if_in:NVTF \g__syu_subsection_tl \g__syu_secnum_bkmr
+          {
+            \tl_remove_all:NV \g__syu_subsection_tl \g__syu_secnum_bkmr
+            \renewcommand*{\thesubsection}
+              { \g__syu_subsection_tl {subsection} }
+          }
+          {
+            \renewcommand*{\thesubsection}
+              {
+                \thesection
+                \g__syu_subsection_tl {subsection}
+              }
+          }
+      }
+    \tl_if_empty:NTF \g__syu_subsubsection_tl
+      {}
+      {
+        \tl_if_in:NVTF \g__syu_subsubsection_tl \g__syu_secnum_bkmr
+          {
+            \tl_remove_all:NV \g__syu_subsubsection_tl \g__syu_secnum_bkmr
+            \renewcommand*{\thesubsubsection}
+              { \g__syu_subsubsection_tl {subsubsection} }
+          }
+          {
+            \renewcommand*{\thesubsubsection}
+              {
+                \thesubsection
+                \g__syu_subsubsection_tl {subsubsection}
+              }
+          }
+      }
+    \tl_if_empty:NTF \g__syu_paragraph_tl
+      {}
+      {
+        \tl_if_in:NVTF \g__syu_paragraph_tl \g__syu_secnum_bkmr
+          {
+            \tl_remove_all:NV \g__syu_paragraph_tl \g__syu_secnum_bkmr
+            \renewcommand*{\theparagraph}
+              { \g__syu_paragraph_tl {paragraph} }
+          }
+          {
+            \renewcommand*{\theparagraph}
+              {
+                \thesubsubsection
+                \g__syu_paragraph_tl {paragraph}
+              }
+          }
+      }
+    \tl_if_empty:NTF \g__syu_subparagraph_tl
+      {}
+      {
+        \tl_if_in:NVTF \g__syu_subparagraph_tl \g__syu_secnum_bkmr
+          {
+            \tl_remove_all:NV \g__syu_subparagraph_tl \g__syu_secnum_bkmr
+            \renewcommand*{\thesubparagraph}
+              { \g__syu_subparagraph_tl {subparagraph} }
+          }
+          {
+            \renewcommand*{\thesubparagraph}
+              {
+                \theparagraph
+                \g__syu_subparagraph_tl {subparagraph}
+              }
+          }
+      }
+   }
 \endinput
 %%
 %% End of file `secnum.sty'.
diff --git a/Master/tlpkg/libexec/ctan2tds b/Master/tlpkg/libexec/ctan2tds
index 8592ed95837..49a0d2a8299 100755
--- a/Master/tlpkg/libexec/ctan2tds
+++ b/Master/tlpkg/libexec/ctan2tds
@@ -3036,7 +3036,7 @@ my $core_latex = "$Master/texmf-dist/tex/latex";
  'schemata'	=> 'tex',
  'scontents'	=> 'etex',
  'scrlayer-fancyhdr' => 'etex',
- 'secnum'	=> 'tex',
+ 'secnum'	=> 'etex-answer-y',
  'silence'      => 'latex -translate-file=empty.tcx',   # no 8-bit
  'skdoc'        => 'tex',
  'stix2-type1'	=> 'tex',