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Subject: bug#78586: TeX-make-inline
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Hi Arash and all,

We had discussed in an earlier thread (bug#78006) the possibility of
adding some of my editing commands to AUCTeX (as standalone commands,
without default binds).  We could start with this one, discussed a bit
in that thread:

--8<---------------cut here---------------start------------->8---
(defcustom TeX-make-inline-delims '("$" . "$")
  "Delimiters for `TeX-make-inline' to surround inline LaTeX math."
  :type '(radio (const :tag "Dollar ($...$)" ("$" . "$"))
                (const :tag "Paren (\\(...\\))" ("\\(" . "\\)"))
                (cons :tag "Custom delimiters"
                      (string :tag "Left") (string :tag "Right"))))

(defun TeX-make-inline ()
  "Convert LaTeX display math environment at point to inline math.
Removes the enclosing math environment (such as \\[...\\] or
\\begin{equation}...\\end{equation}).  Replaces it with inline math
surrounded by `TeX-make-inline-delims', fitting the result onto one
line.  Leaves any trailing punctuation outside the math delimiters."
  (interactive)
  (when (texmathp)
    (when (fboundp 'preview-clearout-at-point)
      (preview-clearout-at-point))
    (save-excursion
      (let* ((env (car texmathp-why))
             (pos (cdr texmathp-why))
             (delims TeX-make-inline-delims))
        (cond
         ((member env '("\\(" "$")))
         ((member env '("\\[" "$$"))
          (goto-char pos)
          (delete-char 2)
          (let ((start (point))
                (end-delim (if (equal env "\\[") "\\]" "$$")))
            (search-forward end-delim)
            (delete-char -2)
            (TeX-make-inline--finalize-region start (point) delims)))
         (t
          (goto-char pos)
          (kill-line)
          (let ((start (point)))
            (search-forward (concat "\\end{" env "}"))
            (beginning-of-line)
            (kill-line)
            (TeX-make-inline--finalize-region start (point) delims))))))))

(defun TeX-make-inline--finalize-region (start end delims)
  "Finalize the inline conversion from START to END using DELIMS."
  (save-restriction
    (narrow-to-region start end)
    (whitespace-cleanup)

    (goto-char (point-min))
    (let ((re
           (concat "\\(?:"
                   (mapconcat #'identity
                              (if (boundp 'reftex-label-regexps)
                                  reftex-label-regexps
                                '("\\\\label{[^}]*"))
                              "\\|")
                   "\\)")))
      (while (re-search-forward re nil t)
        (replace-match "")))

    (goto-char (point-min))
    (while (looking-at "\\s-*$")
      (delete-line))
    (beginning-of-line-text)
    (delete-region (point-min) (point))

    (goto-char (point-max))
    (while (and (> (point) (point-min))
                (progn (forward-line -1)
                       (looking-at "\\s-*$")))
      (delete-line))
    (end-of-line)
    (skip-chars-backward " \t")
    (delete-region (point) (point-max))

    (goto-char (point-min))
    (insert (car delims))
    (goto-char (point-max))
    (insert "\n")
    (backward-char)

    (while (looking-back "[.,;:!?]" 5)
      (backward-char))
    (insert (cdr delims))

    (while (> (count-lines (point-min) (point-max)) 1)
      (join-line))))
--8<---------------cut here---------------end--------------->8---

I haven't prepared this as a patch because I'm not sure where to put it
or where to document it.  I looked around, and couldn't find a natural
place.  If no better idea comes to mind, then perhaps some new
"miscellaneous commands" section of latex.el, with a corresponding
section in the manual?  For what it's worth, there are a couple of other
editing-related commands I'd be inclined to propose.

Any feedback welcome.

Thanks, best,

Paul

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To: "Paul D. Nelson" <ultrono@HIDDEN>
Subject: bug#78586: Acknowledgement (TeX-make-inline)
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Subject: bug#78586: TeX-make-inline
Resent-From: Arash Esbati <arash@HIDDEN>
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Hi Paul,

"Paul D. Nelson" <ultrono@HIDDEN> writes:

> We had discussed in an earlier thread (bug#78006) the possibility of
> adding some of my editing commands to AUCTeX (as standalone commands,
> without default binds).

Thanks for sharing.  I have some comments below:

> We could start with this one, discussed a bit in that thread:
>
> (defcustom TeX-make-inline-delims '("$" . "$")
>   "Delimiters for `TeX-make-inline' to surround inline LaTeX math."
>   :type '(radio (const :tag "Dollar ($...$)" ("$" . "$"))
>                 (const :tag "Paren (\\(...\\))" ("\\(" . "\\)"))
>                 (cons :tag "Custom delimiters"
>                       (string :tag "Left") (string :tag "Right"))))

Do we really need this?  Can we just take the value of
`TeX-electric-math', and make an assumption if it's nil?

> (defun TeX-make-inline ()

This function is LaTeX centric, right?  So I would call is
`LaTeX-make-inline-math' or something and put it in latex.el.

>   "Convert LaTeX display math environment at point to inline math.
> Removes the enclosing math environment (such as \\[...\\] or
> \\begin{equation}...\\end{equation}).  Replaces it with inline math
> surrounded by `TeX-make-inline-delims',

surrounded by `TeX-electric-math' if non-nil, or \"$..$\",

> fitting the result onto one
> line.  Leaves any trailing punctuation outside the math delimiters."
>   (interactive)
>   (when (texmathp)
>     (when (fboundp 'preview-clearout-at-point)
>       (preview-clearout-at-point))
>     (save-excursion
>       (let* ((env (car texmathp-why))
>              (pos (cdr texmathp-why))
>              (delims TeX-make-inline-delims))

(delims (or TeX-electric-math '("$" . "$")))

>         (cond
>          ((member env '("\\(" "$")))
>          ((member env '("\\[" "$$"))
>           (goto-char pos)
>           (delete-char 2)
>           (let ((start (point))
>                 (end-delim (if (equal env "\\[") "\\]" "$$")))
>             (search-forward end-delim)
>             (delete-char -2)
>             (TeX-make-inline--finalize-region start (point) delims)))
>          (t
>           (goto-char pos)
>           (kill-line)
>           (let ((start (point)))
>             (search-forward (concat "\\end{" env "}"))
>             (beginning-of-line)
>             (kill-line)
>             (TeX-make-inline--finalize-region start (point) delims))))))))
>
> (defun TeX-make-inline--finalize-region (start end delims)

(defun LaTeX--whatever-we-agree-to (...)

Would it be possible to write an ERT-test for feature?

> I haven't prepared this as a patch because I'm not sure where to put it
> or where to document it.  I looked around, and couldn't find a natural
> place.

I will have a look, will try to make a suggestion.

> For what it's worth, there are a couple of other editing-related
> commands I'd be inclined to propose.

=F0=9F=91=8D

Best, Arash

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In-Reply-To: <m2msaygqi3.fsf@HIDDEN> (message from Arash Esbati
 on Tue, 27 May 2025 14:57:56 +0200)
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--=-=-=
Content-Type: text/plain

Hi Arash, thanks for your feedback.  I put the updated draft at the end
of this message (to be converted into a patch once one of us thinks of a
good place to put it), and attach some tests.  Paul


--=-=-=
Content-Type: application/emacs-lisp
Content-Disposition: attachment; filename=latex-make-inline-test.el
Content-Transfer-Encoding: quoted-printable

;;; latex-make-inline-test.el --- tests for LaTeX-make-inline  -*- lexical-=
binding: t; -*-

;; Copyright (C) 2025  Free Software Foundation, Inc.

;; This file is part of AUCTeX.

;; AUCTeX is free software; you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.

;; AUCTeX is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;; General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with AUCTeX; see the file COPYING.  If not, write to the Free
;; Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
;; 02110-1301, USA.

;;; Code:

(require 'ert)
(require 'cl-lib)
(require 'latex)

(defmacro latex-make-inline-test--with-temp-buffer (contents &rest body)
  (declare (indent 1) (debug t))
  `(with-temp-buffer
     (LaTeX-mode)
     (insert ,contents)
     (goto-char (point-min))
     (cl-letf (((symbol-function 'preview-clearout-at-point) #'ignore))
       ,@body)))

(ert-deftest LaTeX-make-inline-bracket-period ()
  "Convert \\[..\\] to $..$ and keep trailing period."
  (latex-make-inline-test--with-temp-buffer
      "We have\n\\[ a+b =3D c. \\]"
    (search-forward "b")
    (LaTeX-make-inline)
    (should (equal (buffer-string) "We have $a+b =3D c$."))))

(ert-deftest LaTeX-make-inline-double-dollar ()
  "Convert $$..$$ to $..$."
  (latex-make-inline-test--with-temp-buffer
   "$$x!$$"
   (search-forward "x")
   (LaTeX-make-inline)
   (should (equal (buffer-string) "$x$!"))))

(ert-deftest LaTeX-make-inline-electric-math ()
  "Respect `TeX-electric-math'."
  (let ((TeX-electric-math '("\\(" . "\\)")))
    (latex-make-inline-test--with-temp-buffer
     "\\[ x \\]"
     (search-forward "x")
     (LaTeX-make-inline)
     (should (equal (buffer-string) "\\(x\\)")))))

(ert-deftest LaTeX-make-inline-equation-env ()
  "Convert equation environment, drop \\label, keep comma."
  (latex-make-inline-test--with-temp-buffer
      "\\begin{equation}\n\\label{l}x+y,\n\\end{equation}\n"
    (search-forward "x")
    (let ((TeX-electric-math '("\\(" . "\\)")))
      (LaTeX-make-inline)
      (should (equal (buffer-string) "\\(x+y\\),\n")))))

(ert-deftest LaTeX-make-inline-noop ()
  "Call inside inline math leaves buffer unchanged."
  (latex-make-inline-test--with-temp-buffer
   "Already $z$ inline."
   (search-forward "z")
   (LaTeX-make-inline)
   (should (equal (buffer-string) "Already $z$ inline."))))

;;; latex-make-inline-test.el ends here

--=-=-=
Content-Type: text/plain



--8<---------------cut here---------------start------------->8---
(defun LaTeX-make-inline ()
  "Convert LaTeX display math environment at point to inline math.
Removes the enclosing math environment (such as \\[...\\] or
\\begin{equation}...\\end{equation}).  Replaces it with inline math
surrounded by surrounded by `TeX-electric-math' if non-nil, or \"$..$\",
fitting the result onto one line.  Leaves any trailing punctuation
outside the math delimiters."
  (interactive)
  (when (texmathp)
    (when (fboundp 'preview-clearout-at-point)
      (preview-clearout-at-point))
    (save-excursion
      (let* ((env (car texmathp-why))
             (pos (cdr texmathp-why))
             (delims (or TeX-electric-math '("$" . "$"))))
        (cond
         ((member env '("\\(" "$")))
         ((member env '("\\[" "$$"))
          (goto-char pos)
          (when (looking-back "\n[[:space:]]*")
            (forward-char 2)
            (save-excursion (join-line))
            (forward-char -2))
          (delete-char 2)
          (let ((start (point))
                (end-delim (if (equal env "\\[") "\\]" "$$")))
            (search-forward end-delim)
            (delete-char -2)
            (if (looking-back "\n[[:space:]]*")
                (goto-char (match-beginning 0)))
            (LaTeX--make-inline-finalize-region start (point) delims)))
         (t
          (goto-char pos)
          (kill-whole-line)
          (let ((start (point)))
            (search-forward (concat "\\end{" env "}"))
            (beginning-of-line)
            (kill-whole-line)
            (backward-char)
            (LaTeX--make-inline-finalize-region start (point) delims))))))))

(defun LaTeX--make-inline-finalize-region (start end delims)
  "Finalize the inline conversion from START to END using DELIMS."
  (save-restriction
    (narrow-to-region start end)

    (goto-char (point-min))
    (let ((re
           (concat "\\(?:"
                   (mapconcat #'identity
                              (if (boundp 'reftex-label-regexps)
                                  reftex-label-regexps
                                '("\\\\label{[^}]*"))
                              "\\|")
                   "\\)")))
      (while (re-search-forward re nil t)
        (replace-match "")))

    (goto-char (point-min))
    (while (looking-at "\\s-*$")
      (delete-line))
    (beginning-of-line-text)
    (delete-region (point-min) (point))

    (goto-char (point-max))
    (while (and (> (point) (point-min))
                (progn (forward-line -1)
                       (looking-at "\\s-*$")))
      (delete-line))
    (end-of-line)
    (skip-chars-backward " \t")
    (delete-region (point) (point-max))

    (goto-char (point-min))
    (insert (car delims))
    (goto-char (point-max))

    (while (looking-back "[.,;:!?]" (max (point-min) (- (point) 5)))
      (backward-char))
    (insert (cdr delims))

    (while (> (count-lines (point-min) (point-max)) 1)
      (join-line)))
  (join-line))
--8<---------------cut here---------------end--------------->8---

--=-=-=--

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Hi Paul,

"Paul D. Nelson" <ultrono@HIDDEN> writes:

> Hi Arash, thanks for your feedback.

You're welcome.

> I put the updated draft at the end of this message (to be converted
> into a patch once one of us thinks of a good place to put it), and
> attach some tests.

You said that you also have some other commands, right?  So I suggest we
put them at the end of latex.el, under ;; Utilities:.  WDYT?

Reg. manual: I suggest to document this command under

@subheading Dollar Signs

Maybe something like this:

--8<---------------cut here---------------start------------->8---
diff --git a/doc/auctex.texi b/doc/auctex.texi
index 0b486c8c..9602c062 100644
--- a/doc/auctex.texi
+++ b/doc/auctex.texi
@@ -484,6 +484,16 @@ to prevent unmatched dollar.
 Note that Texinfo mode does nothing special for @kbd{$}.  It inserts
 dollar sign(s) just in the same way as the other normal keys do.

+@AUCTeX{} provides the command @code{LaTeX-make-inline} which converts the
+display math environment at point to inline math.
+
+@deffn Command LaTeX-make-inline
+Convert @LaTeX{} display math environment at point to inline math.  This
+command replaces the enclosing math environment such as @samp{\[...\]} or
+@samp{\begin@{equation@}...\end@{equation@}} with the value of
+@code{TeX-electric-math} or @samp{$...$} by default.
+@end deffn
+
 @subheading Braces

 To avoid unbalanced braces, it is useful to insert them pairwise.  You
--8<---------------cut here---------------end--------------->8---


> (defun LaTeX-make-inline ()
>   "Convert LaTeX display math environment at point to inline math.
> Removes the enclosing math environment (such as \\[...\\] or
> \\begin{equation}...\\end{equation}).  Replaces it with inline math
> surrounded by surrounded by `TeX-electric-math' if non-nil, or \"$..$\",
> fitting the result onto one line.  Leaves any trailing punctuation
> outside the math delimiters."

Please use active voice, maybe something like this:

  "Convert LaTeX display math environment at point to inline math.
Remove the enclosing math environment (such as \\[...\\] or
\\begin{equation}...\\end{equation}) and replace it with inline math
surrounded by `TeX-electric-math' if non-nil, or \"$...$\",
fitting the result onto one line.  Finally, leave any trailing punctuation
outside the math delimiters."

>   (interactive)
>   (when (texmathp)
>     (when (fboundp 'preview-clearout-at-point)
>       (preview-clearout-at-point))
>     (save-excursion
>       (let* ((env (car texmathp-why))
>              (pos (cdr texmathp-why))
>              (delims (or TeX-electric-math '("$" . "$"))))

Why `let*'?

>         (cond
>          ((member env '("\\(" "$")))
>          ((member env '("\\[" "$$"))
>           (goto-char pos)
>           (when (looking-back "\n[[:space:]]*")
>             (forward-char 2)
>             (save-excursion (join-line))
>             (forward-char -2))
>           (delete-char 2)
>           (let ((start (point))
>                 (end-delim (if (equal env "\\[") "\\]" "$$")))
>             (search-forward end-delim)
>             (delete-char -2)
>             (if (looking-back "\n[[:space:]]*")
>                 (goto-char (match-beginning 0)))
>             (LaTeX--make-inline-finalize-region start (point) delims)))
>          (t
>           (goto-char pos)
>           (kill-whole-line)
>           (let ((start (point)))
>             (search-forward (concat "\\end{" env "}"))
>             (beginning-of-line)
>             (kill-whole-line)
>             (backward-char)
>             (LaTeX--make-inline-finalize-region start (point) delims))))))))
>
> (defun LaTeX--make-inline-finalize-region (start end delims)
>   "Finalize the inline conversion from START to END using DELIMS."
>   (save-restriction
>     (narrow-to-region start end)
>
>     (goto-char (point-min))
>     (let ((re
>            (concat "\\(?:"
>                    (mapconcat #'identity
>                               (if (boundp 'reftex-label-regexps)
>                                   reftex-label-regexps
>                                 '("\\\\label{[^}]*"))
>                               "\\|")
>                    "\\)")))

This looks somewhat easier to me:

(let ((re (concat "\\(?:"
                  (if (bound-and-true-p reftex-label-regexps)
                      (mapconcat #'identity reftex-label-regexps "\\|")
                    "\\\\label{[^}]*}")
                  "\\)")))

And note the missing '}' in "\\\\label{[^}]*".

Otherwise LGTM.

Best, Arash

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--=-=-=
Content-Type: text/plain

Hi Arash,

Thanks again for your feedback, and sounds good on all counts.  Please
see attached.

Thanks, best,

Paul



--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Add-LaTeX-make-inline-command.patch

From 129d469a2ab47f61b10f5eb9557de7e525a3830f Mon Sep 17 00:00:00 2001
From: Paul Nelson <ultrono@HIDDEN>
Date: Thu, 29 May 2025 11:14:11 +0200
Subject: [PATCH] Add LaTeX-make-inline command

* latex.el (LaTeX-make-inline): New command.
(LaTeX--make-inline-finalize-region): New helper function.
* tests/latex/latex-make-inline-test.el: New test file.
(latex-make-inline-test--with-temp-buffer): New test macro.
(LaTeX-make-inline-bracket-period)
(LaTeX-make-inline-double-dollar)
(LaTeX-make-inline-electric-math, LaTeX-make-inline-equation-env)
(LaTeX-make-inline-noop): New test cases.

* doc/auctex.texi (Quotes): Document LaTeX-make-inline.
---
 doc/auctex.texi                       | 10 ++++
 latex.el                              | 82 +++++++++++++++++++++++++++
 tests/latex/latex-make-inline-test.el | 79 ++++++++++++++++++++++++++
 3 files changed, 171 insertions(+)
 create mode 100644 tests/latex/latex-make-inline-test.el

diff --git a/doc/auctex.texi b/doc/auctex.texi
index 0b486c8c..9602c062 100644
--- a/doc/auctex.texi
+++ b/doc/auctex.texi
@@ -484,6 +484,16 @@ to prevent unmatched dollar.
 Note that Texinfo mode does nothing special for @kbd{$}.  It inserts
 dollar sign(s) just in the same way as the other normal keys do.
 
+@AUCTeX{} provides the command @code{LaTeX-make-inline} which converts the
+display math environment at point to inline math.
+
+@deffn Command LaTeX-make-inline
+Convert @LaTeX{} display math environment at point to inline math.  This
+command replaces the enclosing math environment such as @samp{\[...\]} or
+@samp{\begin@{equation@}...\end@{equation@}} with the value of
+@code{TeX-electric-math} or @samp{$...$} by default.
+@end deffn
+
 @subheading Braces
 
 To avoid unbalanced braces, it is useful to insert them pairwise.  You
diff --git a/latex.el b/latex.el
index 797513f2..6e34dfc5 100644
--- a/latex.el
+++ b/latex.el
@@ -9551,6 +9551,88 @@ no caption key is found, an error is issued.  See also the docstring of
                           "LARGE" "huge" "Huge")
   "List of LaTeX font size declarations.")
 
+(defun LaTeX-make-inline ()
+  "Convert LaTeX display math environment at point to inline math.
+Remove the enclosing math environment (such as \\[...\\] or
+\\begin{equation}...\\end{equation}) and replace it with inline math
+surrounded by `TeX-electric-math' if non-nil, or \"$..$\", fitting the
+result onto one line.  Finally, leave any trailing punctuation outside
+the math delimiters."
+  (interactive)
+  (when (texmathp)
+    (when (fboundp 'preview-clearout-at-point)
+      (preview-clearout-at-point))
+    (save-excursion
+      (let ((env (car texmathp-why))
+            (pos (cdr texmathp-why))
+            (delims (or TeX-electric-math '("$" . "$"))))
+        (cond
+         ((member env '("\\(" "$")))
+         ((member env '("\\[" "$$"))
+          (goto-char pos)
+          (when (looking-back "\n[[:space:]]*")
+            (forward-char 2)
+            (save-excursion (join-line))
+            (forward-char -2))
+          (delete-char 2)
+          (let ((start (point))
+                (end-delim (if (equal env "\\[") "\\]" "$$")))
+            (search-forward end-delim)
+            (delete-char -2)
+            (if (looking-back "\n[[:space:]]*")
+                (goto-char (match-beginning 0)))
+            (LaTeX--make-inline-finalize-region start (point) delims)))
+         (t
+          (goto-char pos)
+          (kill-whole-line)
+          (let ((start (point)))
+            (search-forward (concat "\\end{" env "}"))
+            (beginning-of-line)
+            (kill-whole-line)
+            (backward-char)
+            (LaTeX--make-inline-finalize-region start (point) delims))))))))
+
+(defun LaTeX--make-inline-finalize-region (start end delims)
+  "Finalize the inline conversion from START to END using DELIMS."
+  (save-restriction
+    (narrow-to-region start end)
+
+    (goto-char (point-min))
+    (let ((re (concat "\\(?:"
+                      (if (bound-and-true-p reftex-label-regexps)
+                          (mapconcat #'identity reftex-label-regexps "\\|")
+                        "\\\\label{[^}]*}")
+                      "\\)")))
+      (while (re-search-forward re nil t)
+        (replace-match "")))
+
+    (goto-char (point-min))
+    (while (looking-at "\\s-*$")
+      (delete-line))
+    (beginning-of-line-text)
+    (delete-region (point-min) (point))
+
+    (goto-char (point-max))
+    (while (and (> (point) (point-min))
+                (progn (forward-line -1)
+                       (looking-at "\\s-*$")))
+      (delete-line))
+    (end-of-line)
+    (skip-chars-backward " \t")
+    (delete-region (point) (point-max))
+
+    (goto-char (point-min))
+    (insert (car delims))
+    (goto-char (point-max))
+
+    (while (looking-back "[.,;:!?]" (max (point-min) (- (point) 5)))
+      (backward-char))
+    (insert (cdr delims))
+
+    (while (> (count-lines (point-min) (point-max)) 1)
+      (join-line)))
+  (join-line))
+
 (provide 'latex)
 
 ;;; latex.el ends here
diff --git a/tests/latex/latex-make-inline-test.el b/tests/latex/latex-make-inline-test.el
new file mode 100644
index 00000000..f4dbadf0
--- /dev/null
+++ b/tests/latex/latex-make-inline-test.el
@@ -0,0 +1,79 @@
+;;; latex-make-inline-test.el --- tests for LaTeX-make-inline  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2025  Free Software Foundation, Inc.
+
+;; This file is part of AUCTeX.
+
+;; AUCTeX is free software; you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+
+;; AUCTeX is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with AUCTeX; see the file COPYING.  If not, write to the Free
+;; Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+;; 02110-1301, USA.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+(require 'latex)
+
+(defmacro latex-make-inline-test--with-temp-buffer (contents &rest body)
+  (declare (indent 1) (debug t))
+  `(with-temp-buffer
+     (LaTeX-mode)
+     (insert ,contents)
+     (goto-char (point-min))
+     (cl-letf (((symbol-function 'preview-clearout-at-point) #'ignore))
+       ,@body)))
+
+(ert-deftest LaTeX-make-inline-bracket-period ()
+  "Convert \\[..\\] to $..$ and keep trailing period."
+  (latex-make-inline-test--with-temp-buffer
+      "We have\n\\[ a+b = c. \\]"
+    (search-forward "b")
+    (LaTeX-make-inline)
+    (should (equal (buffer-string) "We have $a+b = c$."))))
+
+(ert-deftest LaTeX-make-inline-double-dollar ()
+  "Convert $$..$$ to $..$."
+  (latex-make-inline-test--with-temp-buffer
+   "$$x!$$"
+   (search-forward "x")
+   (LaTeX-make-inline)
+   (should (equal (buffer-string) "$x$!"))))
+
+(ert-deftest LaTeX-make-inline-electric-math ()
+  "Respect `TeX-electric-math'."
+  (let ((TeX-electric-math '("\\(" . "\\)")))
+    (latex-make-inline-test--with-temp-buffer
+     "\\[ x \\]"
+     (search-forward "x")
+     (LaTeX-make-inline)
+     (should (equal (buffer-string) "\\(x\\)")))))
+
+(ert-deftest LaTeX-make-inline-equation-env ()
+  "Convert equation environment, drop \\label, keep comma."
+  (latex-make-inline-test--with-temp-buffer
+      "\\begin{equation}\n\\label{l}x+y,\n\\end{equation}\n"
+    (search-forward "x")
+    (let ((TeX-electric-math '("\\(" . "\\)")))
+      (LaTeX-make-inline)
+      (should (equal (buffer-string) "\\(x+y\\),\n")))))
+
+(ert-deftest LaTeX-make-inline-noop ()
+  "Call inside inline math leaves buffer unchanged."
+  (latex-make-inline-test--with-temp-buffer
+   "Already $z$ inline."
+   (search-forward "z")
+   (LaTeX-make-inline)
+   (should (equal (buffer-string) "Already $z$ inline."))))
+
+;;; latex-make-inline-test.el ends here
-- 
2.39.3 (Apple Git-145)


--=-=-=--

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Hi Paul,

>>>>> "Paul D. Nelson" <ultrono@HIDDEN> writes:
> Thanks again for your feedback, and sounds good on all counts.  Please
> see attached.

Thanks for your continuous contributions. I have a very minor comment
this time.

> +(defun LaTeX-make-inline ()
> +  "Convert LaTeX display math environment at point to inline math.
> +Remove the enclosing math environment (such as \\[...\\] or
                                                  ^^^

In docstrings, we need \=3D to escape \[ which introduces
command-to-keybind syntax =F0=9F=99=83

Bye,
Ikumi Keita
#StandWithUkraine #StopWarInUkraine
#Gaza #StopMassiveKilling #CeasefireNOW

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--=-=-=
Content-Type: text/plain

Thanks Ikuya, good catch!  Please find attached the updated patch.  Paul


--=-=-=
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Content-Disposition: attachment;
 filename=0001-Add-LaTeX-make-inline-command.patch

From c5c70ca6e9b0f6e48429476792da877cd605a920 Mon Sep 17 00:00:00 2001
From: Paul Nelson <ultrono@HIDDEN>
Date: Thu, 29 May 2025 11:14:11 +0200
Subject: [PATCH] Add LaTeX-make-inline command

* latex.el (LaTeX-make-inline): New command.
(LaTeX--make-inline-finalize-region): New helper function.
* tests/latex/latex-make-inline-test.el: New test file.
(latex-make-inline-test--with-temp-buffer): New test macro.
(LaTeX-make-inline-bracket-period)
(LaTeX-make-inline-double-dollar)
(LaTeX-make-inline-electric-math, LaTeX-make-inline-equation-env)
(LaTeX-make-inline-noop): New test cases.

* doc/auctex.texi (Quotes): Document LaTeX-make-inline.
---
 doc/auctex.texi                       | 10 ++++
 latex.el                              | 82 +++++++++++++++++++++++++++
 tests/latex/latex-make-inline-test.el | 79 ++++++++++++++++++++++++++
 3 files changed, 171 insertions(+)
 create mode 100644 tests/latex/latex-make-inline-test.el

diff --git a/doc/auctex.texi b/doc/auctex.texi
index 0b486c8c..9602c062 100644
--- a/doc/auctex.texi
+++ b/doc/auctex.texi
@@ -484,6 +484,16 @@ to prevent unmatched dollar.
 Note that Texinfo mode does nothing special for @kbd{$}.  It inserts
 dollar sign(s) just in the same way as the other normal keys do.
 
+@AUCTeX{} provides the command @code{LaTeX-make-inline} which converts the
+display math environment at point to inline math.
+
+@deffn Command LaTeX-make-inline
+Convert @LaTeX{} display math environment at point to inline math.  This
+command replaces the enclosing math environment such as @samp{\[...\]} or
+@samp{\begin@{equation@}...\end@{equation@}} with the value of
+@code{TeX-electric-math} or @samp{$...$} by default.
+@end deffn
+
 @subheading Braces
 
 To avoid unbalanced braces, it is useful to insert them pairwise.  You
diff --git a/latex.el b/latex.el
index 797513f2..c305fa3a 100644
--- a/latex.el
+++ b/latex.el
@@ -9551,6 +9551,88 @@ no caption key is found, an error is issued.  See also the docstring of
                           "LARGE" "huge" "Huge")
   "List of LaTeX font size declarations.")
 
+(defun LaTeX-make-inline ()
+  "Convert LaTeX display math environment at point to inline math.
+Remove the enclosing math environment (such as \\\\=[...\\\\=] or
+\\begin{equation}...\\end{equation}) and replace it with inline math
+surrounded by `TeX-electric-math' if non-nil, or \"$...$\", fitting the
+result onto one line.  Finally, leave any trailing punctuation outside
+the math delimiters."
+  (interactive)
+  (when (texmathp)
+    (when (fboundp 'preview-clearout-at-point)
+      (preview-clearout-at-point))
+    (save-excursion
+      (let ((env (car texmathp-why))
+            (pos (cdr texmathp-why))
+            (delims (or TeX-electric-math '("$" . "$"))))
+        (cond
+         ((member env '("\\(" "$")))
+         ((member env '("\\[" "$$"))
+          (goto-char pos)
+          (when (looking-back "\n[[:space:]]*")
+            (forward-char 2)
+            (save-excursion (join-line))
+            (forward-char -2))
+          (delete-char 2)
+          (let ((start (point))
+                (end-delim (if (equal env "\\[") "\\]" "$$")))
+            (search-forward end-delim)
+            (delete-char -2)
+            (if (looking-back "\n[[:space:]]*")
+                (goto-char (match-beginning 0)))
+            (LaTeX--make-inline-finalize-region start (point) delims)))
+         (t
+          (goto-char pos)
+          (kill-whole-line)
+          (let ((start (point)))
+            (search-forward (concat "\\end{" env "}"))
+            (beginning-of-line)
+            (kill-whole-line)
+            (backward-char)
+            (LaTeX--make-inline-finalize-region start (point) delims))))))))
+
+(defun LaTeX--make-inline-finalize-region (start end delims)
+  "Finalize the inline conversion from START to END using DELIMS."
+  (save-restriction
+    (narrow-to-region start end)
+
+    (goto-char (point-min))
+    (let ((re (concat "\\(?:"
+                      (if (bound-and-true-p reftex-label-regexps)
+                          (mapconcat #'identity reftex-label-regexps "\\|")
+                        "\\\\label{[^}]*}")
+                      "\\)")))
+      (while (re-search-forward re nil t)
+        (replace-match "")))
+
+    (goto-char (point-min))
+    (while (looking-at "\\s-*$")
+      (delete-line))
+    (beginning-of-line-text)
+    (delete-region (point-min) (point))
+
+    (goto-char (point-max))
+    (while (and (> (point) (point-min))
+                (progn (forward-line -1)
+                       (looking-at "\\s-*$")))
+      (delete-line))
+    (end-of-line)
+    (skip-chars-backward " \t")
+    (delete-region (point) (point-max))
+
+    (goto-char (point-min))
+    (insert (car delims))
+    (goto-char (point-max))
+
+    (while (looking-back "[.,;:!?]" (max (point-min) (- (point) 5)))
+      (backward-char))
+    (insert (cdr delims))
+
+    (while (> (count-lines (point-min) (point-max)) 1)
+      (join-line)))
+  (join-line))
+
 (provide 'latex)
 
 ;;; latex.el ends here
diff --git a/tests/latex/latex-make-inline-test.el b/tests/latex/latex-make-inline-test.el
new file mode 100644
index 00000000..f4dbadf0
--- /dev/null
+++ b/tests/latex/latex-make-inline-test.el
@@ -0,0 +1,79 @@
+;;; latex-make-inline-test.el --- tests for LaTeX-make-inline  -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2025  Free Software Foundation, Inc.
+
+;; This file is part of AUCTeX.
+
+;; AUCTeX is free software; you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+
+;; AUCTeX is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with AUCTeX; see the file COPYING.  If not, write to the Free
+;; Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+;; 02110-1301, USA.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+(require 'latex)
+
+(defmacro latex-make-inline-test--with-temp-buffer (contents &rest body)
+  (declare (indent 1) (debug t))
+  `(with-temp-buffer
+     (LaTeX-mode)
+     (insert ,contents)
+     (goto-char (point-min))
+     (cl-letf (((symbol-function 'preview-clearout-at-point) #'ignore))
+       ,@body)))
+
+(ert-deftest LaTeX-make-inline-bracket-period ()
+  "Convert \\[..\\] to $..$ and keep trailing period."
+  (latex-make-inline-test--with-temp-buffer
+      "We have\n\\[ a+b = c. \\]"
+    (search-forward "b")
+    (LaTeX-make-inline)
+    (should (equal (buffer-string) "We have $a+b = c$."))))
+
+(ert-deftest LaTeX-make-inline-double-dollar ()
+  "Convert $$..$$ to $..$."
+  (latex-make-inline-test--with-temp-buffer
+   "$$x!$$"
+   (search-forward "x")
+   (LaTeX-make-inline)
+   (should (equal (buffer-string) "$x$!"))))
+
+(ert-deftest LaTeX-make-inline-electric-math ()
+  "Respect `TeX-electric-math'."
+  (let ((TeX-electric-math '("\\(" . "\\)")))
+    (latex-make-inline-test--with-temp-buffer
+     "\\[ x \\]"
+     (search-forward "x")
+     (LaTeX-make-inline)
+     (should (equal (buffer-string) "\\(x\\)")))))
+
+(ert-deftest LaTeX-make-inline-equation-env ()
+  "Convert equation environment, drop \\label, keep comma."
+  (latex-make-inline-test--with-temp-buffer
+      "\\begin{equation}\n\\label{l}x+y,\n\\end{equation}\n"
+    (search-forward "x")
+    (let ((TeX-electric-math '("\\(" . "\\)")))
+      (LaTeX-make-inline)
+      (should (equal (buffer-string) "\\(x+y\\),\n")))))
+
+(ert-deftest LaTeX-make-inline-noop ()
+  "Call inside inline math leaves buffer unchanged."
+  (latex-make-inline-test--with-temp-buffer
+   "Already $z$ inline."
+   (search-forward "z")
+   (LaTeX-make-inline)
+   (should (equal (buffer-string) "Already $z$ inline."))))
+
+;;; latex-make-inline-test.el ends here
-- 
2.39.3 (Apple Git-145)


--=-=-=--

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Hi Paul,

>>>>> "Paul D. Nelson" <ultrono@HIDDEN> writes:
> Thanks Ikuya, good catch!  Please find attached the updated patch.  Paul

> +(defun LaTeX-make-inline ()
> +  "Convert LaTeX display math environment at point to inline math.
> +Remove the enclosing math environment (such as \\\\=[...\\\\=] or

That works but I recommend
\\=\\[
rather than \\\\=[ . See (elisp) Keys in Documentation:
,----
| $B!F(B\=$B!G(B
|      quotes the following character and is discarded; thus, $B!F(B\=`$B!G(B puts
|      $B!F(B`$B!G(B into the output, $B!F(B\=\[$B!G(B puts $B!F(B\[$B!G(B into the output, and $B!F(B\=\=$B!G(B
|      puts $B!F(B\=$B!G(B into the output.
`----
And you don't have to quote \]. It will be displayed literally.

Additionally, we should provide similar quotation in
> +(ert-deftest LaTeX-make-inline-bracket-period ()
> +  "Convert \\[..\\] to $..$ and keep trailing period."
as well.

Bye,
Ikumi Keita
#StandWithUkraine #StopWarInUkraine
#Gaza #StopMassiveKilling #CeasefireNOW

Last modified: Fri, 30 May 2025 07:00:02 UTC

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