bug#43965: 27.1; An Introduction to Programming in Emacs Lisp

bug#43965: 27.1; An Introduction to Programming in Emacs Lisp

[Carlos Ysais via Bug reports for GNU Emacs, the Swiss army knife of text editors]

--text follows this line--

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https://www.gnu.org/software/emacs/manual/html_node/eintr/sentence_002dend.html#sentence_002dend

"According to convention, you type two spaces after every sentence".
Recently a percentage of people have been using one space instead of
two to end sentences. Because it is a matter of preference, it would be
nice if one space is included in the regexes shown in this section.

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https://www.gnu.org/software/emacs/manual/html_node/eintr/graph_002dbody_002dprint.html#graph_002dbody_002dprint

The function graph-body-print has:
;; Place point for X axis labels.
(forward-line height)
(insert "\n")

https://www.gnu.org/software/emacs/manual/html_node/eintr/recursive_002dgraph_002dbody_002dprint.html#recursive_002dgraph_002dbody_002dprint

While recursive-graph-body-print and recursive-graph-body-print-internal
do not place the point for X axis labels.

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https://www.gnu.org/software/emacs/manual/html_node/eintr/Simple-Extension.html#Simple-Extension

The beginning sentence "Here is a simple extension to Emacs that moves
the line point is on to the top of the window." should be "Here is a
simple extension to Emacs that moves the line point to the top of the
window.".

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https://www.gnu.org/software/emacs/manual/html_node/eintr/Determining-the-Element.html#Determining-the-Element

The examples for explaining the function mod used positive integers but
the last example for the function current-kill used 1 as the first
argument which results to (mod (-1 4) 4) which is equivalent to
(mod -3 4) which evaluates to 1. An explanation for how the function mod
works with negative integers would clear up misunderstandings.

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https://www.gnu.org/software/emacs/manual/html_node/eintr/X-Axis-Tic-Marks.html#X-Axis-Tic-Marks

In its defvar expression, the variable X-axis-label-spacing is set to
(* 5 (length graph-blank)) if the variable graph-blank was already bound
(else it is set to 5). In the following examples of code,
X-axis-label-spacing is multiplied by symbol-width which is the same as
(length graph-blank). If the variable graph-blank was bound, this
multiplies X-axis-label-spacing by (length graph-blank) twice (which is
undesired).

Also this snippet of code has unneeded parentheses.
;; number-of-X-ticks
(if (zerop (% (X-length tic-width)))
     (/ (X-length tic-width))
   (1+ (/ (X-length tic-width))))

Should be.
;; number-of-X-ticks
(if (zerop (% X-length tic-width))
     (/ X-length tic-width)
   (1+ (/ X-length tic-width))

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In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.22, 
cairo version 1.17.3)
  of 2020-08-29 built on juergen
Windowing system distributor 'The X.Org Foundation', version 11.0.12009000
System Description: Manjaro Linux

Recent messages:
Wrote 
/home/aiaiaiex/Documents/CJ/Emacs/books/gnu_emacs_manuals/aitpiel/errors.el
Saving file 
/home/aiaiaiex/Documents/CJ/Emacs/books/gnu_emacs_manuals/aitpiel/errors.el...
Wrote 
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evil-backward-char: Beginning of line
Auto-saving...done
Saving file 
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evil-line-move: Beginning of buffer [7 times]
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evil-line-move: Beginning of buffer [29 times]
evil-line-move: Beginning of buffer
Configured using:
  'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
  --localstatedir=/var --with-x-toolkit=gtk3 --with-xft --with-wide-int
  --with-modules --with-cairo --with-harfbuzz 'CFLAGS=-march=x86-64
  -mtune=generic -O2 -pipe -fno-plt' CPPFLAGS=-D_FORTIFY_SOURCE=2
  LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD JSON
PDUMPER LCMS2 GMP

Important settings:
   value of $LC_MONETARY: en_PH.UTF-8
   value of $LC_NUMERIC: en_PH.UTF-8
   value of $LC_TIME: en_PH.UTF-8
   value of $LANG: en_PH.utf8
   locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
   show-paren-mode: t
   global-display-fill-column-indicator-mode: t
   display-fill-column-indicator-mode: t
   global-linum-mode: t
   linum-mode: t
   global-hl-line-mode: t
   global-undo-tree-mode: t
   undo-tree-mode: t
   shell-dirtrack-mode: t
   evil-mode: t
   evil-local-mode: t
   tooltip-mode: t
   global-eldoc-mode: t
   eldoc-mode: t
   electric-indent-mode: t
   mouse-wheel-mode: t
   file-name-shadow-mode: t
   global-font-lock-mode: t
   font-lock-mode: t
   blink-cursor-mode: t
   auto-composition-mode: t
   auto-encryption-mode: t
   auto-compression-mode: t
   column-number-mode: t
   line-number-mode: t
   transient-mark-mode: t

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/home/aiaiaiex/.emacs.d/elpa/org-plus-contrib-20200921/ol-w3m hides 
/usr/share/emacs/27.1/lisp/org/ol-w3m
/home/aiaiaiex/.emacs.d/elpa/org-plus-contrib-20200921/ol-bbdb hides 
/usr/share/emacs/27.1/lisp/org/ol-bbdb
/home/aiaiaiex/.emacs.d/elpa/org-plus-contrib-20200921/ob-sass hides 
/usr/share/emacs/27.1/lisp/org/ob-sass
/home/aiaiaiex/.emacs.d/elpa/org-plus-contrib-20200921/ol hides 
/usr/share/emacs/27.1/lisp/org/ol
/home/aiaiaiex/.emacs.d/elpa/org-plus-contrib-20200921/org-plot hides 
/usr/share/emacs/27.1/lisp/org/org-plot
/home/aiaiaiex/.emacs.d/elpa/org-plus-contrib-20200921/ob-R hides 
/usr/share/emacs/27.1/lisp/org/ob-R
/home/aiaiaiex/.emacs.d/elpa/org-plus-contrib-20200921/ob-eshell hides 
/usr/share/emacs/27.1/lisp/org/ob-eshell
/home/aiaiaiex/.emacs.d/elpa/org-plus-contrib-20200921/org-loaddefs 
hides /usr/share/emacs/27.1/lisp/org/org-loaddefs
/home/aiaiaiex/.emacs.d/elpa/org-plus-contrib-20200921/ob-exp hides 
/usr/share/emacs/27.1/lisp/org/ob-exp
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Features:
(shadow sort mail-extr emacsbug message rmc dired dired-loaddefs
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racket-repl-buffer-name racket-stepper racket-logger racket-profile
racket-smart-open racket-xp racket-xp-complete racket-show pos-tip
racket-imenu imenu racket-edit hideshow racket-repl compile racket-eldoc
racket-describe shr text-property-search url-cookie url-domsuf url-util
puny svg xml dom racket-visit racket-complete racket-common
racket-parens racket-indent racket-font-lock racket-ppss
racket-keywords-and-builtins racket-doc racket-cmd racket-util
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use-package-ensure use-package-core finder-inf info package easymenu
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backquote threads dbusbind inotify lcms2 dynamic-setting
system-font-setting font-render-setting cairo move-toolbar gtk x-toolkit
x multi-tty make-network-process emacs)

Memory information:
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bug#43965: 27.1; An Introduction to Programming in Emacs Lisp

[Richard Stallman]

[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]

  > "According to convention, you type two spaces after every sentence".
  > Recently a percentage of people have been using one space instead of
  > two to end sentences. Because it is a matter of preference, it would be
  > nice if one space is included in the regexes shown in this section.

That change would make the sentence commands give incorrect results.
There is a reason the regexp is what it is.

1. If you write two spaces between sentences, it is possible for
Emacs to distinguish sentence ends from abbreviations.  That regexp
is designed to do that.

2. If you write just once spaces between sentences, it is IMpossible for
Emacs to distinguish sentence ends from abbreviations.  No matter what regexp
you use, it can't do this job entirely right.

For users who want to have the sentence commands distinguish abbeviations
properly, there is only one way to get that:
(a) put two spaces between sentences, and
(b) use the current regexp, which matches only two spaces.

Your change would break case 1, and case 2 would still be broken
because case 2 is impossible.

If you want to use case 2, go ahead, but we will not break case 1!

-- 
Dr Richard Stallman
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)

bug#43965: 27.1; An Introduction to Programming in Emacs Lisp

[Carlos Ysais via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Hello,

Thanks for explaining why it is impossible for regular
expressions to distinguish sentences ending with one space. Looking back
at the book, it is indeed explained. I may have glossed over it (which
is a mistake in my part). Interestingly, I wasn't even taught in school
that there was an alternative to one space. So the book was the first to
bring two spaces to my attention. Again thanks for showing the existence
and benefits of using two spaces.

Regarding the other sections of the book I have commented on, I am sorry
in advance if they weren't bugs but rather misunderstandings on my part 
(just
like this regex section). For example I wrote:

   > The beginning sentence "Here is a simple extension to Emacs that moves
   > the line point is on to the top of the window." should be "Here is a
   > simple extension to Emacs that moves the line point to the top of the
   > window.".

The original sentence was already correct and I was just reading "line 
point" as
a single word rather than separate words which made me confused. Though
personally I find inserting "where" to transform the phrase to "the line 
where
point is on" makes it less confusing. Maybe I should sleep on it before 
sending
a bug report.

Best regards,
Carlos Ysais

bug#43965: 27.1; An Introduction to Programming in Emacs Lisp

[Richard Stallman]

[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]

  > The original sentence was already correct and I was just reading "line 
  > point" as
  > a single word rather than separate words which made me confused. Though
  > personally I find inserting "where" to transform the phrase to "the line 
  > where
  > point is on" makes it less confusing.

Adding a word there seems like a good idea.  Thanks for suggesting it.

Grammatically, the word should be "that", not "where", because its
antecedent is the omitted object of the preposition "on".

Where exactly did you find that text?

-- 
Dr Richard Stallman
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)

bug#43965: 27.1; An Introduction to Programming in Emacs Lisp

[Carlos Ysais via Bug reports for GNU Emacs, the Swiss army knife of text editors]

It is in Chapter 16.11

https://www.gnu.org/software/emacs/manual/html_node/eintr/Simple-Extension.html#Simple-Extension

You can find it in the first sentence and in the documentation string of
line-to-top-of-window.

Best regards,
Carlos Ysais

bug#43965: 27.1; An Introduction to Programming in Emacs Lisp

[Richard Stallman]

[[[ To any NSA and FBI agents reading my email: please consider    ]]]
[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]

Thanks.  I fixed that in master.

-- 
Dr Richard Stallman
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)

bug#43965: 27.1; An Introduction to Programming in Emacs Lisp

[Stefan Kangas]

Richard Stallman <rms@gnu.org> writes:

> [[[ To any NSA and FBI agents reading my email: please consider    ]]]
> [[[ whether defending the US Constitution against all enemies,     ]]]
> [[[ foreign or domestic, requires you to follow Snowden's example. ]]]
>
>   > The original sentence was already correct and I was just reading "line
>   > point" as
>   > a single word rather than separate words which made me confused. Though
>   > personally I find inserting "where" to transform the phrase to "the line
>   > where
>   > point is on" makes it less confusing.
>
> Adding a word there seems like a good idea.  Thanks for suggesting it.
>
> Grammatically, the word should be "that", not "where", because its
> antecedent is the omitted object of the preposition "on".
>
> Where exactly did you find that text?

I found that text, and will push a fix for it.  Thanks.