Stefan Kangas <stefankangas@HIDDEN>
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From: Stefan Kangas <stefankangas@HIDDEN>
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Subject: Re: bug#76007: 31.0.50;
Interpreter not correctly found when using nix-shell.
To: Malcolm Purvis <malcolm@HIDDEN>, 76007 <at> debbugs.gnu.org
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Malcolm Purvis <malcolm@HIDDEN> writes:
> In NixOS if you want to use a script that manages its own
> dependencies, you use a command called "nix-shell" or "nix shell"
> to launch the script.
>
> The start of such a script looks like:
>
> #! /usr/bin/env nix-shell
> #! nix-shell -i bash -p imagemagick cowsay
>
> or
>
> #! /usr/bin/env nix
> #! nix shell github:tomberek/-#perlWith.HTMLTokeParserSimple.LWP
> --command perl -x
>
> The OS interpreter is nix-shell and nix-shell launches the real
> interpreter to execute the rest of the script.
>
> With these scripts, Emacs's current behaviour is as follows:
>
> - nix-shell is not interpreter-mode-alist so Emacs looks at the
> file's
> extension:
>
> - If the file has an extension then the correct mode is used
> - If the file does not have an extension then Fundamental mode is
> used
> regardless of the script's actual language.
>
> If the file is a shell script with the correct extension, sh-mode
> is used but sh-mode fails to guess the shell, leaving the variable
> sh-shell as 'nix-shell.
>
> In most cases this means that some shell features are not enabled,
> but otherwise it is possible to edit the script.
>
> However, lsp-mode's bash language support (lsp-bash.el) throws an
> error if sh-shell is not set to it's supported values ('sh and
> 'bash), and as a result nix bash scripts fail.
>
> The solution is to add a new regexp to
> auto-mode-interpreter-regexp that will detect a nix script and
> extract the real interpreter from the second line. Nix shell can
> be invoked in a number of ways but this regexp matches the common
> forms.
>
>
> diff --git a/lisp/files.el b/lisp/files.el
> index 5ff40c335d7..1f3ac1431d2 100644
> --- a/lisp/files.el
> +++ b/lisp/files.el
> @@ -3389,6 +3389,7 @@ and `inhibit-local-variables-suffixes'. If
> "\\(?:[^ \t\n]+=[^ \t\n]*[ \t]+\\)*"
> "\\)?"
> "\\)?"
> + "\\(?:\\(?:nix\\|nix-shell\\)\n#![
> \t]+\\(?:nix\\|nix-shell\\).*\\(?:-i\\|--command\\)[ \t]+\\)?"
> ;; Group 2: interpreter. "\\([^ \t\n]+\\)")
> "Regexp matching interpreters, for file mode determination.
>
>
> Malcolm
Thanks for the bug report.
This looks to me like a bug in lsp-mode, or lsp-bash.el. I recommend
reporting the bug to them first.
bug-gnu-emacs@HIDDEN:bug#76007; Package emacs.
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From: Malcolm Purvis <malcolm@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 31.0.50; Interpreter not correctly found when using nix-shell.
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In NixOS if you want to use a script that manages its own
dependencies, you use a command called "nix-shell" or "nix shell"
to launch the script.
The start of such a script looks like:
#! /usr/bin/env nix-shell
#! nix-shell -i bash -p imagemagick cowsay
or
#! /usr/bin/env nix
#! nix shell github:tomberek/-#perlWith.HTMLTokeParserSimple.LWP
--command perl -x
The OS interpreter is nix-shell and nix-shell launches the real
interpreter to execute the rest of the script.
With these scripts, Emacs's current behaviour is as follows:
- nix-shell is not interpreter-mode-alist so Emacs looks at the
file's
extension:
- If the file has an extension then the correct mode is used
- If the file does not have an extension then Fundamental mode is
used
regardless of the script's actual language.
If the file is a shell script with the correct extension, sh-mode
is used but sh-mode fails to guess the shell, leaving the variable
sh-shell as 'nix-shell.
In most cases this means that some shell features are not enabled,
but otherwise it is possible to edit the script.
However, lsp-mode's bash language support (lsp-bash.el) throws an
error if sh-shell is not set to it's supported values ('sh and
'bash), and as a result nix bash scripts fail.
The solution is to add a new regexp to
auto-mode-interpreter-regexp that will detect a nix script and
extract the real interpreter from the second line. Nix shell can
be invoked in a number of ways but this regexp matches the common
forms.
diff --git a/lisp/files.el b/lisp/files.el
index 5ff40c335d7..1f3ac1431d2 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -3389,6 +3389,7 @@ and `inhibit-local-variables-suffixes'. If
"\\(?:[^ \t\n]+=[^ \t\n]*[ \t]+\\)*"
"\\)?"
"\\)?"
+ "\\(?:\\(?:nix\\|nix-shell\\)\n#![
\t]+\\(?:nix\\|nix-shell\\).*\\(?:-i\\|--command\\)[ \t]+\\)?"
;; Group 2: interpreter. "\\([^ \t\n]+\\)")
"Regexp matching interpreters, for file mode determination.
Malcolm
In GNU Emacs 31.0.50 (build 2, x86_64-apple-darwin24.2.0, NS
appkit-2575.30 Version 15.2 (Build 24C101)) of 2025-01-11 built on
lamechWindowing system distributor 'Apple', version 10.3.2575
System Description: macOS 15.2
Configured using:
'configure
--enable-locallisppath=/usr/local/share/emacs/site-lisp
--infodir=/usr/local/Cellar/emacs-head@31/31.0.50_1/share/info/emacs
--prefix=/usr/local/Cellar/emacs-head@31/31.0.50_1 --without-x
--without-dbus --with-native-compilation --with-imagemagick
--with-modules --with-gnutls --with-rsvg --with-xml2
--with-xwidgets --with-webp --with-ns --disable-ns-self-contained
'CFLAGS=-O2 -march=native -pipe -DFD_SETSIZE=10000
-DDARWIN_UNLIMITED_SELECT' 'LDFLAGS=-L/usr/local/lib/gcc/14
-I/usr/local/opt/gcc/include -I/usr/local/opt/libgccjit/include
-I/usr/local/opt/gmp/include -I/usr/local/opt/jpeg/include''
--
Malcolm Purvis <malcolm@HIDDEN>
Malcolm Purvis <malcolm@HIDDEN>:bug-gnu-emacs@HIDDEN.
Full text available.bug-gnu-emacs@HIDDEN:bug#76007; Package emacs.
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