texinfo @summarycontents - how can I adjust the level depth?

Question

I wrote/edit a texinfo manual, specifically the GNU Emacs Lisp Bytecode Reference Manual, and if you look on page i (sheet 2) there is a short table of contents, but it is too short.

So I'd like to include one more level, i.e. the section headings as well as the chapter headings that are already there.

How can I do this?

Answer 1

I looked at the texinfo.tex file and it appears that a short table of contents just redefines the macros for sections and subsections to null.

Here then is a diff:

diff -u texinfo-hacked.tex{~,}
--- texinfo-hacked.tex~ 2019-10-07 16:44:56.000000000 -0400
+++ texinfo-hacked.tex  2019-11-29 12:41:46.105737894 -0500

@@ -6881,15 +6881,18 @@
     \rm
     \hyphenpenalty = 10000
     \advance\baselineskip by 1pt % Open it up a little.
-    \def\numsecentry##1##2##3##4{}
-    \let\appsecentry = \numsecentry
-    \let\unnsecentry = \numsecentry
-    \let\numsubsecentry = \numsecentry
-    \let\appsubsecentry = \numsecentry
-    \let\unnsubsecentry = \numsecentry
-    \let\numsubsubsecentry = \numsecentry
-    \let\appsubsubsecentry = \numsecentry
-    \let\unnsubsubsecentry = \numsecentry
+    % Wwe want section
+    % headers in our short contents
+    \def\nullentry##1##2##3##4{}
+    % \def\numsecentry##1##2##3##4{}
+    % \let\appsecentry = \numsecentry
+    % \let\unnsecentry = \numsecentry
+    \let\numsubsecentry = \nullentry
+    \let\appsubsecentry = \nullentry
+    \let\unnsubsecentry = \nullentry
+    \let\numsubsubsecentry = \nullentry
+    \let\appsubsubsecentry = \nullentry
+    \let\unnsubsubsecentry = \nullentry
     \openin 1 \tocreadfilename\space
     \ifeof 1 \else
       \readtocfile