From 468dad2c5af1dfdb34753335c101308e7934fe5b Mon Sep 17 00:00:00 2001
From: Eli Zaretskii <eliz@gnu.org>
Date: Sun, 8 Mar 2026 14:51:13 +0200
Subject: [PATCH] Use images in Emacs Lisp Intro manual (bug#80519)

* doc/lispintro/emacs-lisp-intro.texi (Lists diagrammed)
(Symbols as Chest, kill-ring-yank-pointer, lambda): Use @image and
remove ASCII-art diagrams, which are now on separate *.txt files.
(header): Remove print-postscript-figures and its commentary.

* doc/lispintro/Makefile.in (auxfiles): New file list.
(${buildinfodir}/%.txt, ${buildinfodir}/%.png): New targets.
(${buildinfodir}/eintr.info): Depend on ${auxfiles}.
(infoclean): Remove ${auxfiles}.

* doc/lispintro/cons-1.png:
* doc/lispintro/cons-1.txt:
* doc/lispintro/cons-2.png:
* doc/lispintro/cons-2.txt:
* doc/lispintro/cons-2a.png:
* doc/lispintro/cons-2a.txt:
* doc/lispintro/cons-3.png:
* doc/lispintro/cons-3.txt:
* doc/lispintro/cons-4.png:
* doc/lispintro/cons-4.txt:
* doc/lispintro/cons-5.png:
* doc/lispintro/cons-5.txt:
* doc/lispintro/drawers.png:
* doc/lispintro/drawers.txt:
* doc/lispintro/lambda-1.png:
* doc/lispintro/lambda-1.txt:
* doc/lispintro/lambda-2.png:
* doc/lispintro/lambda-2.txt:
* doc/lispintro/lambda-3.png:
* doc/lispintro/lambda-3.txt: New files, from Matto Fransen
<matto@matto.nl>.
---
 doc/lispintro/Makefile.in           |  31 ++++-
 doc/lispintro/cons-1.png            | Bin 0 -> 3264 bytes
 doc/lispintro/cons-1.txt            |   5 +
 doc/lispintro/cons-2.png            | Bin 0 -> 4038 bytes
 doc/lispintro/cons-2.txt            |   7 ++
 doc/lispintro/cons-2a.png           | Bin 0 -> 5017 bytes
 doc/lispintro/cons-2a.txt           |   7 ++
 doc/lispintro/cons-3.png            | Bin 0 -> 4699 bytes
 doc/lispintro/cons-3.txt            |   8 ++
 doc/lispintro/cons-4.png            | Bin 0 -> 5575 bytes
 doc/lispintro/cons-4.txt            |   8 ++
 doc/lispintro/cons-5.png            | Bin 0 -> 6064 bytes
 doc/lispintro/cons-5.txt            |  12 ++
 doc/lispintro/drawers.png           | Bin 0 -> 15219 bytes
 doc/lispintro/drawers.txt           |  22 ++++
 doc/lispintro/emacs-lisp-intro.texi | 189 ----------------------------
 doc/lispintro/lambda-1.png          | Bin 0 -> 3168 bytes
 doc/lispintro/lambda-1.txt          |   4 +
 doc/lispintro/lambda-2.png          | Bin 0 -> 3743 bytes
 doc/lispintro/lambda-2.txt          |   4 +
 doc/lispintro/lambda-3.png          | Bin 0 -> 3584 bytes
 doc/lispintro/lambda-3.txt          |   4 +
 22 files changed, 111 insertions(+), 190 deletions(-)
 create mode 100644 doc/lispintro/cons-1.png
 create mode 100644 doc/lispintro/cons-1.txt
 create mode 100644 doc/lispintro/cons-2.png
 create mode 100644 doc/lispintro/cons-2.txt
 create mode 100644 doc/lispintro/cons-2a.png
 create mode 100644 doc/lispintro/cons-2a.txt
 create mode 100644 doc/lispintro/cons-3.png
 create mode 100644 doc/lispintro/cons-3.txt
 create mode 100644 doc/lispintro/cons-4.png
 create mode 100644 doc/lispintro/cons-4.txt
 create mode 100644 doc/lispintro/cons-5.png
 create mode 100644 doc/lispintro/cons-5.txt
 create mode 100644 doc/lispintro/drawers.png
 create mode 100644 doc/lispintro/drawers.txt
 create mode 100644 doc/lispintro/lambda-1.png
 create mode 100644 doc/lispintro/lambda-1.txt
 create mode 100644 doc/lispintro/lambda-2.png
 create mode 100644 doc/lispintro/lambda-2.txt
 create mode 100644 doc/lispintro/lambda-3.png
 create mode 100644 doc/lispintro/lambda-3.txt

diff --git a/doc/lispintro/Makefile.in b/doc/lispintro/Makefile.in
index 411a6f1a473..f941d8166db 100644
--- a/doc/lispintro/Makefile.in
+++ b/doc/lispintro/Makefile.in
@@ -84,9 +84,37 @@ ps: $(PS_TARGETS)
 ${buildinfodir}:
 	${MKDIR_P} $@
 
+auxfiles = \
+	${buildinfodir}/cons-1.png \
+	${buildinfodir}/cons-1.txt \
+	${buildinfodir}/cons-2.png \
+	${buildinfodir}/cons-2.txt \
+	${buildinfodir}/cons-2a.png \
+	${buildinfodir}/cons-2a.txt \
+	${buildinfodir}/cons-3.png \
+	${buildinfodir}/cons-3.txt \
+	${buildinfodir}/cons-4.png \
+	${buildinfodir}/cons-4.txt \
+	${buildinfodir}/cons-5.png \
+	${buildinfodir}/cons-5.txt \
+	${buildinfodir}/drawers.png \
+	${buildinfodir}/drawers.txt \
+	${buildinfodir}/lambda-1.png \
+	${buildinfodir}/lambda-1.txt \
+	${buildinfodir}/lambda-2.png \
+	${buildinfodir}/lambda-2.txt \
+	${buildinfodir}/lambda-3.png \
+	${buildinfodir}/lambda-3.txt
+
+${buildinfodir}/%.txt: ${srcdir}/%.txt | ${buildinfodir}
+	cp $< $@
+
+${buildinfodir}/%.png: ${srcdir}/%.png | ${buildinfodir}
+	cp $< $@
+
 # The file name eintr must fit within 5 characters, to allow for
 # -NN extensions to fit into DOS 8+3 limits without clashing.
-${buildinfodir}/eintr.info: ${srcs} | ${buildinfodir}
+${buildinfodir}/eintr.info: ${srcs} ${auxfiles} | ${buildinfodir}
 	$(AM_V_GEN)$(MAKEINFO) $(MAKEINFO_OPTS) $(INFO_OPTS) -o $@ $<
 
 emacs-lisp-intro.dvi: ${srcs}
@@ -117,6 +145,7 @@ infoclean:
 	rm -f \
 	  $(buildinfodir)/eintr.info \
 	  $(buildinfodir)/eintr.info-[1-9]
+	rm -f $(auxfiles)
 
 bootstrap-clean maintainer-clean: distclean infoclean
 	rm -f TAGS
diff --git a/doc/lispintro/cons-1.png b/doc/lispintro/cons-1.png
new file mode 100644
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diff --git a/doc/lispintro/cons-1.txt b/doc/lispintro/cons-1.txt
new file mode 100644
index 00000000000..78f684d94bc
--- /dev/null
+++ b/doc/lispintro/cons-1.txt
@@ -0,0 +1,5 @@
+         ___ ___      ___ ___      ___ ___
+        |___|___|--> |___|___|--> |___|___|--> nil
+          |            |            |
+          |            |            |
+           --> rose     --> violet   --> buttercup
diff --git a/doc/lispintro/cons-2.png b/doc/lispintro/cons-2.png
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diff --git a/doc/lispintro/cons-2.txt b/doc/lispintro/cons-2.txt
new file mode 100644
index 00000000000..5146cc9e3a3
--- /dev/null
+++ b/doc/lispintro/cons-2.txt
@@ -0,0 +1,7 @@
+     bouquet
+      |
+      |     ___ ___      ___ ___      ___ ___
+       --> |___|___|--> |___|___|--> |___|___|--> nil
+             |            |            |
+             |            |            |
+              --> rose     --> violet   --> buttercup
diff --git a/doc/lispintro/cons-2a.png b/doc/lispintro/cons-2a.png
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diff --git a/doc/lispintro/cons-2a.txt b/doc/lispintro/cons-2a.txt
new file mode 100644
index 00000000000..03c26ec1d91
--- /dev/null
+++ b/doc/lispintro/cons-2a.txt
@@ -0,0 +1,7 @@
+     bouquet
+      |
+      |    --------------       ---------------       ----------------
+      |   | car   | cdr  |     | car    | cdr  |     | car     | cdr  |
+       -->| rose  |   o------->| violet |   o------->| butter- |  nil |
+          |       |      |     |        |      |     | cup     |      |
+           --------------       ---------------       ----------------
diff --git a/doc/lispintro/cons-3.png b/doc/lispintro/cons-3.png
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diff --git a/doc/lispintro/cons-3.txt b/doc/lispintro/cons-3.txt
new file mode 100644
index 00000000000..c8d46d46532
--- /dev/null
+++ b/doc/lispintro/cons-3.txt
@@ -0,0 +1,8 @@
+     bouquet        flowers
+       |              |
+       |     ___ ___  |     ___ ___      ___ ___
+        --> |   |   |  --> |   |   |    |   |   |
+            |___|___|----> |___|___|--> |___|___|--> nil
+              |              |            |
+              |              |            |
+               --> rose       --> violet   --> buttercup
diff --git a/doc/lispintro/cons-4.png b/doc/lispintro/cons-4.png
new file mode 100644
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diff --git a/doc/lispintro/cons-4.txt b/doc/lispintro/cons-4.txt
new file mode 100644
index 00000000000..34ccdf14834
--- /dev/null
+++ b/doc/lispintro/cons-4.txt
@@ -0,0 +1,8 @@
+     bouquet                       flowers
+       |                             |
+       |     ___ ___        ___ ___  |     ___ ___       ___ ___
+        --> |   |   |      |   |   |  --> |   |   |     |   |   |
+            |___|___|----> |___|___|----> |___|___|---->|___|___|--> nil
+              |              |              |             |
+              |              |              |             |
+               --> lily      --> rose       --> violet    --> buttercup
diff --git a/doc/lispintro/cons-5.png b/doc/lispintro/cons-5.png
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diff --git a/doc/lispintro/cons-5.txt b/doc/lispintro/cons-5.txt
new file mode 100644
index 00000000000..62216753195
--- /dev/null
+++ b/doc/lispintro/cons-5.txt
@@ -0,0 +1,12 @@
+     kill-ring     kill-ring-yank-pointer
+         |               |
+         |      ___ ___  |     ___ ___      ___ ___
+          ---> |   |   |  --> |   |   |    |   |   |
+               |___|___|----> |___|___|--> |___|___|--> nil
+                 |              |            |
+                 |              |            |
+                 |              |             --> "yet more text"
+                 |              |
+                 |               --> "a different piece of text"
+                 |
+                  --> "some text"
diff --git a/doc/lispintro/drawers.png b/doc/lispintro/drawers.png
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diff --git a/doc/lispintro/drawers.txt b/doc/lispintro/drawers.txt
new file mode 100644
index 00000000000..9c2c7a40e49
--- /dev/null
+++ b/doc/lispintro/drawers.txt
@@ -0,0 +1,22 @@
+		 Chest of Drawers            Contents of Drawers
+
+		 __   o0O0o   __
+	       /                 \
+	      ---------------------
+	     |    directions to    |            [map to]
+	     |     symbol name     |             bouquet
+	     |                     |
+	     +---------------------+
+	     |    directions to    |
+	     |  symbol definition  |             [none]
+	     |                     |
+	     +---------------------+
+	     |    directions to    |            [map to]
+	     |    variable value   |             (rose violet buttercup)
+	     |                     |
+	     +---------------------+
+	     |    directions to    |
+	     |    property list    |             [not described here]
+	     |                     |
+	     +---------------------+
+	     |/                   \|
diff --git a/doc/lispintro/emacs-lisp-intro.texi b/doc/lispintro/emacs-lisp-intro.texi
index 50e253ece4b..fc5a7d972b6 100644
--- a/doc/lispintro/emacs-lisp-intro.texi
+++ b/doc/lispintro/emacs-lisp-intro.texi
@@ -41,16 +41,6 @@
 @clear  largebook
 @end ifset
 
-@c ================ Included Figures ================
-
-@c If you clear this, the figures will be printed as ASCII diagrams
-@c rather than PostScript/PDF.
-@c (This is not relevant to Info, since Info only handles ASCII.)
-@iftex
-@set print-postscript-figures
-@end iftex
-@c clear print-postscript-figures
-
 @comment %**end of header
 
 @c per rms and peterb, use 10pt fonts for the main text, mostly to
@@ -9567,25 +9557,10 @@ which holds the address for the atom @samp{buttercup}.
 
 @need 1200
 This sounds more complicated than it is and is easier seen in a diagram:
-
-@c clear print-postscript-figures
 @c !!! cons-cell-diagram #1
-@ifset print-postscript-figures
 @sp 1
 @center @image{cons-1}
 @sp 1
-@end ifset
-@ifclear print-postscript-figures
-@smallexample
-@group
-    ___ ___      ___ ___      ___ ___
-   |___|___|--> |___|___|--> |___|___|--> nil
-     |            |            |
-     |            |            |
-      --> rose     --> violet   --> buttercup
-@end group
-@end smallexample
-@end ifclear
 
 @noindent
 In the diagram, each box represents a word of computer memory that
@@ -9610,26 +9585,10 @@ evaluation of the expression
 @need 1250
 @noindent
 creates a situation like this:
-
 @c cons-cell-diagram #2
-@ifset print-postscript-figures
 @sp 1
 @center @image{cons-2}
 @sp 1
-@end ifset
-@ifclear print-postscript-figures
-@smallexample
-@group
-bouquet
-     |
-     |     ___ ___      ___ ___      ___ ___
-      --> |___|___|--> |___|___|--> |___|___|--> nil
-            |            |            |
-            |            |            |
-             --> rose     --> violet   --> buttercup
-@end group
-@end smallexample
-@end ifclear
 
 @noindent
 In this example, the symbol @code{bouquet} holds the address of the first
@@ -9638,26 +9597,10 @@ pair of boxes.
 @need 1200
 This same list can be illustrated in a different sort of box notation
 like this:
-
 @c cons-cell-diagram #2a
-@ifset print-postscript-figures
 @sp 1
 @center @image{cons-2a}
 @sp 1
-@end ifset
-@ifclear print-postscript-figures
-@smallexample
-@group
-bouquet
- |
- |    --------------       ---------------       ----------------
- |   | car   | cdr  |     | car    | cdr  |     | car     | cdr  |
-  -->| rose  |   o------->| violet |   o------->| butter- |  nil |
-     |       |      |     |        |      |     | cup     |      |
-      --------------       ---------------       ----------------
-@end group
-@end smallexample
-@end ifclear
 
 (Symbols consist of more than pairs of addresses, but the structure of
 a symbol is made up of addresses.  Indeed, the symbol @code{bouquet}
@@ -9681,29 +9624,10 @@ evaluation of the following expression
 @need 800
 @noindent
 produces this:
-
 @c cons-cell-diagram #3
-@ifset print-postscript-figures
 @sp 1
 @center @image{cons-3}
 @sp 1
-@end ifset
-@ifclear print-postscript-figures
-@sp 1
-@smallexample
-@group
-bouquet        flowers
-  |              |
-  |     ___ ___  |     ___ ___      ___ ___
-   --> |   |   |  --> |   |   |    |   |   |
-       |___|___|----> |___|___|--> |___|___|--> nil
-         |              |            |
-         |              |            |
-          --> rose       --> violet   --> buttercup
-@end group
-@end smallexample
-@sp 1
-@end ifclear
 
 @noindent
 The value of @code{flowers} is @code{(violet buttercup)}, which is
@@ -9731,29 +9655,11 @@ the expression
 @need 1500
 @noindent
 produces:
-
 @c cons-cell-diagram #4
-@ifset print-postscript-figures
 @sp 1
 @center @image{cons-4}
 @sp 1
 @end ifset
-@ifclear print-postscript-figures
-@sp 1
-@smallexample
-@group
-bouquet                       flowers
-  |                             |
-  |     ___ ___        ___ ___  |     ___ ___       ___ ___
-   --> |   |   |      |   |   |  --> |   |   |     |   |   |
-       |___|___|----> |___|___|----> |___|___|---->|___|___|--> nil
-         |              |              |             |
-         |              |              |             |
-          --> lily      --> rose       --> violet    --> buttercup
-@end group
-@end smallexample
-@sp 1
-@end ifclear
 
 @need 1200
 @noindent
@@ -9810,43 +9716,10 @@ Reference Manual}.)
 
 @need 1500
 Here is a fanciful representation:
-
 @c chest-of-drawers diagram
-@ifset print-postscript-figures
 @sp 1
 @center @image{drawers}
 @sp 1
-@end ifset
-@ifclear print-postscript-figures
-@sp 1
-@smallexample
-@group
-            Chest of Drawers            Contents of Drawers
-
-            __   o0O0o   __
-          /                 \
-         ---------------------
-        |    directions to    |            [map to]
-        |     symbol name     |             bouquet
-        |                     |
-        +---------------------+
-        |    directions to    |
-        |  symbol definition  |             [none]
-        |                     |
-        +---------------------+
-        |    directions to    |            [map to]
-        |    variable value   |             (rose violet buttercup)
-        |                     |
-        +---------------------+
-        |    directions to    |
-        |    property list    |             [not described here]
-        |                     |
-        +---------------------+
-        |/                   \|
-@end group
-@end smallexample
-@sp 1
-@end ifclear
 
 @node List Exercise
 @section Exercise
@@ -9959,32 +9832,10 @@ by both the @code{kill-ring} and the @code{kill-ring-yank-pointer}.  The
 words ``a different piece of text'' and ``yet more text'' are not
 duplicated.  Instead, the two Lisp variables point to the same pieces of
 text.  Here is a diagram:
-
 @c cons-cell-diagram #5
-@ifset print-postscript-figures
 @sp 1
 @center @image{cons-5}
 @sp 1
-@end ifset
-@ifclear print-postscript-figures
-@smallexample
-@group
-kill-ring     kill-ring-yank-pointer
-    |               |
-    |      ___ ___  |     ___ ___      ___ ___
-     ---> |   |   |  --> |   |   |    |   |   |
-          |___|___|----> |___|___|--> |___|___|--> nil
-            |              |            |
-            |              |            |
-            |              |             --> "yet more text"
-            |              |
-            |               --> "a different piece of text"
-            |
-             --> "some text"
-@end group
-@end smallexample
-@sp 1
-@end ifclear
 
 Both the variable @code{kill-ring} and the variable
 @code{kill-ring-yank-pointer} are pointers.  But the kill ring itself is
@@ -20706,24 +20557,10 @@ equivalent of @code{multiply-by-seven} is:
 @need 1250
 @noindent
 If we want to multiply 3 by 7, we can write:
-
-@c clear print-postscript-figures
 @c lambda example diagram #1
-@ifset print-postscript-figures
 @sp 1
 @center @image{lambda-1}
 @sp 1
-@end ifset
-@ifclear print-postscript-figures
-@smallexample
-@group
-(multiply-by-seven 3)
- \_______________/ ^
-         |         |
-      function  argument
-@end group
-@end smallexample
-@end ifclear
 
 @noindent
 This expression returns 21.
@@ -20731,44 +20568,18 @@ This expression returns 21.
 @need 1250
 @noindent
 Similarly, we can write:
-
 @c lambda example diagram #2
-@ifset print-postscript-figures
 @sp 1
 @center @image{lambda-2}
 @sp 1
-@end ifset
-@ifclear print-postscript-figures
-@smallexample
-@group
-((lambda (number) (* 7 number)) 3)
- \____________________________/ ^
-               |                |
-      anonymous function     argument
-@end group
-@end smallexample
-@end ifclear
 
 @need 1250
 @noindent
 If we want to divide 100 by 50, we can write:
-
 @c lambda example diagram #3
-@ifset print-postscript-figures
 @sp 1
 @center @image{lambda-3}
 @sp 1
-@end ifset
-@ifclear print-postscript-figures
-@smallexample
-@group
-((lambda (arg) (/ arg 50)) 100)
- \______________________/  \_/
-             |              |
-    anonymous function   argument
-@end group
-@end smallexample
-@end ifclear
 
 @noindent
 This expression returns 2.  The 100 is passed to the function, which
diff --git a/doc/lispintro/lambda-1.png b/doc/lispintro/lambda-1.png
new file mode 100644
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diff --git a/doc/lispintro/lambda-1.txt b/doc/lispintro/lambda-1.txt
new file mode 100644
index 00000000000..a3701e3e7d8
--- /dev/null
+++ b/doc/lispintro/lambda-1.txt
@@ -0,0 +1,4 @@
+     (multiply-by-seven 3)
+      \_______________/ ^
+              |         |
+           function  argument
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new file mode 100644
index 00000000000..40d0de448c4
--- /dev/null
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+     ((lambda (number) (* 7 number)) 3)
+      \____________________________/ ^
+                    |                |
+           anonymous function     argument
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diff --git a/doc/lispintro/lambda-3.txt b/doc/lispintro/lambda-3.txt
new file mode 100644
index 00000000000..20e48dc2e56
--- /dev/null
+++ b/doc/lispintro/lambda-3.txt
@@ -0,0 +1,4 @@
+     ((lambda (arg) (/ arg 50)) 100)
+      \______________________/  \_/
+                  |              |
+         anonymous function   argument