bug#68692: 29.1; File-local variable storage for strings with newlines

bug#68692: 29.1; File-local variable storage for strings with newlines

[Karthik Chikmagalur]

Storing file-local variables whose values are strings that include
newlines triggers an error when the file is opened.

To reproduce:

1. Create a file with this file local variable:

--8<---------------cut here---------------start------------->8---
(defvar testvar nil)
(find-file "/tmp/test.txt")
(insert "Some text\n\n")
(add-file-local-variable 'testvar "Data on\ntwo lines")
--8<---------------cut here---------------end--------------->8---

The buffer test.txt now looks like this:

--8<---------------cut here---------------start------------->8---
Some text

;; Local Variables:
;; testvar: "Data on
two lines"
;; End:
--8<---------------cut here---------------end--------------->8---

Saving and killing test.txt and repopening it causes the error:

--8<---------------cut here---------------start------------->8---
File mode specification error: (user-error Local variables entry is missing the prefix)
--8<---------------cut here---------------end--------------->8---

Turning on toggle-debug-on-error does not produce a backtrace.

Is it not possible to store strings with newlines as the values of
file-local variables? The elisp manual makes no mention of this
limitation in the file-local vars section -- perhaps I missed something?

Karthik

-------------------------------------------------------
System details:


In GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
version 1.18.0, Xaw3d scroll bars)
Windowing system distributor 'The X.Org Foundation', version 11.0.12101009
System Description: NixOS 23.11 (Tapir)

Configured using:
 'configure
 --prefix=/nix/store/0g4xxdsn4xp9qhgc4cylbksqpwsn51vc-emacs-29.1
 --disable-build-details --with-modules --with-x-toolkit=lucid
 --with-xft --with-cairo --with-native-compilation --with-tree-sitter
 --with-xinput2'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG JSON
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP X11 XAW3D XDBE XIM XINPUT2 XPM
LUCID ZLIB

Important settings:
  value of $EMACSLOADPATH: 
  value of $EMACSNATIVELOADPATH: 
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
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/nix/store/x1n5gkd710d5f0hz9l48wfrh07f1672w-emacs-packages-deps/share/emacs/site-lisp/elpa/org-9.6.12/ob-eshell hides /nix/store/0g4xxdsn4xp9qhgc4cylbksqpwsn51vc-emacs-29.1/share/emacs/29.1/lisp/org/ob-eshell
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/nix/store/x1n5gkd710d5f0hz9l48wfrh07f1672w-emacs-packages-deps/share/emacs/site-lisp/elpa/org-9.6.12/ob-awk hides /nix/store/0g4xxdsn4xp9qhgc4cylbksqpwsn51vc-emacs-29.1/share/emacs/29.1/lisp/org/ob-awk
/nix/store/x1n5gkd710d5f0hz9l48wfrh07f1672w-emacs-packages-deps/share/emacs/site-lisp/elpa/org-9.6.12/org-id hides /nix/store/0g4xxdsn4xp9qhgc4cylbksqpwsn51vc-emacs-29.1/share/emacs/29.1/lisp/org/org-id
/nix/store/x1n5gkd710d5f0hz9l48wfrh07f1672w-emacs-packages-deps/share/emacs/site-lisp/elpa/org-9.6.12/org-attach-git hides /nix/store/0g4xxdsn4xp9qhgc4cylbksqpwsn51vc-emacs-29.1/share/emacs/29.1/lisp/org/org-attach-git
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bug#68692: 29.1; File-local variable storage for strings with newlines

[Eli Zaretskii]

> From: Karthik Chikmagalur <karthikchikmagalur@gmail.com>
> Date: Wed, 24 Jan 2024 09:21:47 -0800
> 
> 
> Storing file-local variables whose values are strings that include
> newlines triggers an error when the file is opened.

That's because you violated the supported format.

> The buffer test.txt now looks like this:
> 
> --8<---------------cut here---------------start------------->8---
> Some text
> 
> ;; Local Variables:
> ;; testvar: "Data on
> two lines"
> ;; End:
> --8<---------------cut here---------------end--------------->8---
> 
> Saving and killing test.txt and repopening it causes the error:
> 
> --8<---------------cut here---------------start------------->8---
> File mode specification error: (user-error Local variables entry is missing the prefix)
> --8<---------------cut here---------------end--------------->8---
> 
> Turning on toggle-debug-on-error does not produce a backtrace.
> 
> Is it not possible to store strings with newlines as the values of
> file-local variables? The elisp manual makes no mention of this
> limitation in the file-local vars section -- perhaps I missed something?

I think you missed this part in the Emacs user manual:

     A local variables list starts with a line containing the string
  ‘Local Variables:’, and ends with a line containing the string ‘End:’.
  In between come the variable names and values, one set per line, like
  this:

       /* Local Variables:  */
       /* mode: c           */
       /* comment-column: 0 */
       /* End:              */

  In this example, each line starts with the prefix ‘/*’ and ends with the
  suffix ‘*/’.

Note the last sentence.

The manual says a little after the above:

                                                If you want to split a
  long string value across multiple lines of the file, you can use
  backslash-newline, which is ignored in Lisp string constants; you should
  put the prefix and suffix on each line, even lines that start or end
  within the string, as they will be stripped off when processing the
  list.  Here is an example:

       # Local Variables:
       # compile-command: "cc foo.c -Dfoo=bar -Dhack=whatever \
       #   -Dmumble=blaah"
       # End:

Which I believe is what you are looking for.

I don't think there's a bug in Emacs here.

bug#68692: 29.1; File-local variable storage for strings with newlines

[Eli Zaretskii]

[Please use Reply All when replying, to have the bug tracker CC'ed.]

> From: Karthik Chikmagalur <karthikchikmagalur@gmail.com>
> Date: Thu, 25 Jan 2024 19:14:43 -0800
> 
> Hello Eli,
> 
> Please close this bug, I read the local variables section of the elisp
> manual but missed the Emacs one.

I'm therefore closing this bug.

> However, I have a question now.
> 
> > The manual says a little after the above:
> >
> >                                                 If you want to split a
> >   long string value across multiple lines of the file, you can use
> >   backslash-newline, which is ignored in Lisp string constants; you should
> >   put the prefix and suffix on each line, even lines that start or end
> >   within the string, as they will be stripped off when processing the
> >   list.  Here is an example:
> >
> >        # Local Variables:
> >        # compile-command: "cc foo.c -Dfoo=bar -Dhack=whatever \
> >        #   -Dmumble=blaah"
> >        # End:
> >
> > Which I believe is what you are looking for.
> >
> > I don't think there's a bug in Emacs here.
> 
> Is there a programmatic way (using elisp) to insert a local variable
> value that is a string that extends over multiple lines, as in my
> original example?  I can write a helper function to replace newlines
> with backslash-newlines, but determining the right suffix to add at the
> end of each line is tricky.

We have add-file-local-variable and modify-file-local-variable -- did
you try any of them?  If they don't handle this case, we need to fix
them so they do.

> I am addressing this right now by let-binding `print-escape-newlines' to
> t around calls to `add-file-local-variable', but perhaps there is a
> better way.

bug#68692: 29.1; File-local variable storage for strings with newlines

[Karthik Chikmagalur]

>> Is there a programmatic way (using elisp) to insert a local variable
>> value that is a string that extends over multiple lines, as in my
>> original example?  I can write a helper function to replace newlines
>> with backslash-newlines, but determining the right suffix to add at the
>> end of each line is tricky.
>
> We have add-file-local-variable and modify-file-local-variable -- did
> you try any of them?  If they don't handle this case, we need to fix
> them so they do.

Yes, I tried both, and they don't handle this case correctly. (My
original bug report used add-file-local-variable in the reproduction
instructions.)

Should this be filed as a bug, or should I email emacs-devel about this?
I don't know how to solve it beyond let-binding print-escape-newlines to
t in modify-file-local-variable -- I don't know if this can cause other
problems.

Karthik

bug#68692: 29.1; File-local variable storage for strings with newlines

[Eli Zaretskii]

> From: Karthik Chikmagalur <karthikchikmagalur@gmail.com>
> Cc: 68692-done@debbugs.gnu.org
> Date: Fri, 26 Jan 2024 11:49:51 -0800
> 
> > We have add-file-local-variable and modify-file-local-variable -- did
> > you try any of them?  If they don't handle this case, we need to fix
> > them so they do.
> 
> Yes, I tried both, and they don't handle this case correctly. (My
> original bug report used add-file-local-variable in the reproduction
> instructions.)
> 
> Should this be filed as a bug, or should I email emacs-devel about this?

Please file a separate bug report with a recipe to reproduce the
problem, i.e. a recipe that shows how these functions fail to
update/add a variable whose value has an embedded newline.

Thanks.