GNU bug report logs - #78976
2 bugs in eintr

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: "Иван Битюцкий" <ivbit <at> rambler.ru>
To: bug-gnu-emacs <at> gnu.org
Cc: eliz <at> gnu.org
Subject: 2 bugs in eintr
Date: Tue, 08 Jul 2025 14:37:08 +0000

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Greetings! I've found 2 bugs in "Emacs Lisp Intro", which is"An Introduction to Programming in Emacs Lisp" by Bob Chassell. *** 1st bug: When reading in Emacs in info and evaluating code from Appendix C "A graph with labeled axes" with C-x C-e, then switching to scratch buffer to print the graph, Emacs complains about wrong number of arguments to a function print-Y-axis . *** 2nd bug: Appendix C "A graph with labeled axes" , function print-X-axis-numbered-line does not print the first number in the X axis of the graph. *** I've fixed both bugs and the fixed functions are in attached file eintr-bugfix.el.gz *** Suggestion: Add another page with final versions of all functions to print graph put together, so readers can install them with C-x C-e, then switch to the scratch buffer and print the graph. I've collected all the necessary functions with bugfixes and a small extra function to make it easier to print graph in attached file eintr-graph.el.gz *** Other:  At the end of Index node, when I press SPACE, I'm taken to "C.2.1 Side Trip: Compute a Remainder" instead of "About the Author" node. *** I'm switching to GNU Emacs after 20 years of using the "other" editor. Feels great so far.

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[eintr-bugfix.el.gz (application/gzip, attachment)]

[eintr-graph.el.gz (application/gzip, attachment)]

Message #8 received at 78976 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Иван Битюцкий <ivbit <at> rambler.ru>
Cc: 78976 <at> debbugs.gnu.org
Subject: Re: 2 bugs in eintr
Date: Sat, 19 Jul 2025 10:46:43 +0300

> Date: Tue, 08 Jul 2025 14:37:08 +0000
> From: "Иван Битюцкий" <ivbit <at> rambler.ru>
> Cc: eliz <at> gnu.org
> 
> Greetings!
> I've found 2 bugs in "Emacs Lisp Intro", which is
> "An Introduction to Programming in Emacs Lisp"
> by Bob Chassell.
> ***
> 1st bug: When reading in Emacs in info and evaluating code
> from Appendix C "A graph with labeled axes" with C-x C-e,
> then switching to scratch buffer to print the graph, Emacs
> complains about wrong number of arguments to a function
> print-Y-axis .
> ***
> 2nd bug: Appendix C "A graph with labeled axes" , function
> print-X-axis-numbered-line does not print the first number
> in the X axis of the graph.
> ***
> I've fixed both bugs and the fixed functions are in attached
> file eintr-bugfix.el.gz

Thanks.  However, I couldn't figure out what code specifically you are
talking about.  Appendix C has quite a lot of code, with some
functions presented more than once, as the development of their code
proceeds.  I need specific pointers to problematic code, preferably in
terms of line numbers in the source file emacs-lisp-intro.texi.  The
code you present is also quite different from what the manual presents
as the "final versions" of the functions in section C.4 and its
subs-sections.  So I had difficulty understanding what to change and
where.

> ***
> Suggestion: Add another page with final versions of all
> functions to print graph put together, so readers can
> install them with C-x C-e, then switch to the scratch
> buffer and print the graph. I've collected all the necessary
> functions with bugfixes and a small extra function to make
> it easier to print graph in attached file eintr-graph.el.gz

This is okay, but your suggested code includes more than just the
functions and the variables needed to build graphs: it also includes
some graph data.  These should be clearly separated, for obvious
didactic reasons.

> ***
> Other:  At the end of Index node, when I press SPACE,
> I'm taken to "C.2.1 Side Trip: Compute a Remainder"
> instead of "About the Author" node.

Pressing SPC at the end of a node with a menu (which is what the Index
node is: a giant menu) should take you to the node pointed to by the
first menu item.  In my case, the first menu item is this:

  * .emacs file:                           Emacs Initialization. (line   6)

And indeed, pressing SPC takes me to the "Emacs Initialization" node.
So I see no problem here, and don't understand why you expected to be
taken to "C.2.1" subsection.

Message #11 received at 78976 <at> debbugs.gnu.org (full text, mbox):

From: "Иван Битюцкий" <ivbit <at> rambler.ru>
To: 78976 <at> debbugs.gnu.org
Subject: Re: 2 bugs in eintr
Date: Tue, 22 Jul 2025 02:45:50 +0000

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In file emacs-lisp-intro.texi downloaded from: https://www.gnu.org/software/emacs/manual/texi/eintr.texi.tar.gz https://www.gnu.org/software/emacs/manual/texi/eintr.texi.tar.gz 1st bug was in function at line 20014, (defun print-Y-axis I see it is fixed now with defun added at line 21463. 2nd bug is in function at line 21597, (defun print-X-axis-numbered-line Fix is to insert additional line at line 21609: (number-to-string horizontal-step) Not all functions labeled "final" are actually final in this chapter. Some have improved versions later in the text. Functions in eintr-graph.el.gz were all copied from info version of manual while reading in Emacs. Adding them as another page is just a suggestion. Fixing 2 bugs should be enough, I think.

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Message #14 received at 78976 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Иван Битюцкий <ivbit <at> rambler.ru>
Cc: 78976 <at> debbugs.gnu.org
Subject: Re: bug#78976: 2 bugs in eintr
Date: Sat, 26 Jul 2025 12:24:53 +0300

> Date: Tue, 22 Jul 2025 02:45:50 +0000
> From: ivbit--- via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> In file emacs-lisp-intro.texi downloaded from:
> https://www.gnu.org/software/emacs/manual/texi/eintr.texi.tar.gz
> 
> 1st bug was in function at line 20014, (defun print-Y-axis
> I see it is fixed now with defun added at line 21463.

OK.

> 2nd bug is in function at line 21597, (defun print-X-axis-numbered-line

This function is in @ignore block, so it doesn't get into the manual.
Do we still need to fix it?  Or maybe we need to fix some other place?

> Fix is to insert additional line at line 21609:
> (number-to-string horizontal-step)
> 
> Not all functions labeled "final" are actually final in this chapter.
> Some have improved versions later in the text.
> Functions in eintr-graph.el.gz were all copied from info version of manual while reading in Emacs.
> Adding them as another page is just a suggestion. Fixing 2 bugs should be enough, I think.

OK.

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