GNU bug report logs - #64939
30.0.50; The default auto-mode-interpreter-regexp does not match env with flags

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Package: emacs; Reported by: Wilhelm Kirschbaum <wkirschbaum@HIDDEN>; dated Sat, 29 Jul 2023 20:30:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Eli Zaretskii <eliz@HIDDEN>
To: Wilhelm Kirschbaum <wkirschbaum@HIDDEN>
In-Reply-To: <878rays89s.fsf@HIDDEN> (message from Wilhelm Kirschbaum on
 Sat, 29 Jul 2023 23:38:07 +0200)
Subject: Re: bug#64939: 30.0.50;
 The default auto-mode-interpreter-regexp does not match env with flags
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> From: Wilhelm Kirschbaum <wkirschbaum@HIDDEN>
> Date: Sat, 29 Jul 2023 23:38:07 +0200
> 
> This is a very naive solution to the above, but I am probably
> missing some knowledge here and will break for anyone setting the
> var to something custom.

Feel free to make this change locally, but I don't see how this can be
general enough for us to install it as the default value.

For starters, 'env' can be invoked with several options, not just with
one.  Also, some 'env' options accept arguments, and how do we know if
the word that follows "env -OPTION" is the command to check against
interpreter-mode-alist or an argument of an option?

IOW, I don't think this is a problem for a regexp-based solution.  If
we want to support such complex shebang lines (btw, does the Posix or
GNU/Linux shell support them?), we should analyze the text after "env"
to find the candidate interpreter.  Not sure whether even that will
provide a robust solution.

Btw, can't you satisfy your needs via file-local variables?
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#64939; Package emacs. Full text available.

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From: Eli Zaretskii <eliz@HIDDEN>
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Subject: Re: bug#64939: 30.0.50;
 The default auto-mode-interpreter-regexp does not match env with flags
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> From: Wilhelm Kirschbaum <wkirschbaum@HIDDEN>
> Date: Sat, 29 Jul 2023 22:08:19 +0200
> 
> 
> A file without an extension will load ruby-mode if the first line 
> is:
> 
>     #!/usr/bin/env ruby
> 
> but not when the first line is:
> 
>     #!/usr/bin/env -S ruby -e 'puts 123'
> 
> Is there any reason why the latter should not be matched by the 
> default
> `auto-mode-interpreter-regexp' value in 'files.el'?

That line _is_ matched by auto-mode-interpreter-regexp:

  (string-match-p auto-mode-interpreter-regexp "#!/usr/bin/env -S ruby -e 'puts 123'") => 0

The problem is how to find the name of the interpreter if the text
after "/usr/bin/env" includes more than one word?  Once we start using
command-line switches and their arguments, and take into consideration
that many GNU/Linux programs can freely intersperse options and
non-option arguments on the command line in any order, where does this
end?

> A more useful example I stumbled on today while working on a 
> language
> server after adding:
> 
> `(add-to-list 'interpreter-mode-alist '("elixir" 
> . elixir-ts-mode))'
> 
> 
>     #!/usr/bin/env -S elixir --erl "-kernel standard_io_encoding 
>     latin1"

How about making a script that invokes elixir with those arguments,
and then augment interpreter-mode-alist to name that script instead?
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#64939; Package emacs. Full text available.

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User-agent: mu4e 1.9.3; emacs 30.0.50
From: Wilhelm Kirschbaum <wkirschbaum@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: Re: 30.0.50; The default auto-mode-interpreter-regexp does not
 match env with flags
Date: Sat, 29 Jul 2023 23:38:07 +0200
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> A file without an extension will load ruby-mode if the first 
> line is:
>
>    #!/usr/bin/env ruby
>
> but not when the first line is:
>
>    #!/usr/bin/env -S ruby -e 'puts 123'
>
> Is there any reason why the latter should not be matched by the
> default
> `auto-mode-interpreter-regexp' value in 'files.el'?
>
>
> A more useful example I stumbled on today while working on a 
> language
> server after adding:
>
> `(add-to-list 'interpreter-mode-alist '("elixir" 
> . elixir-ts-mode))'
>
>
>    #!/usr/bin/env -S elixir --erl "-kernel standard_io_encoding
>      latin1"
>
>    Node.start(:"next-ls-#{System.system_time()}", :shortnames)
>    ....
>
>
>
> Wilhelm

This is a very naive solution to the above, but I am probably 
missing some
knowledge here and will break for anyone setting the var to 
something
custom.

modified   lisp/files.el
@@ -3243,7 +3243,7 @@ inhibit-local-variables-p
 
 (defvar auto-mode-interpreter-regexp
   (purecopy "#![ \t]?\\([^ \t\n]*\
-/bin/env[ \t]\\)?\\([^ \t\n]+\\)")
+/bin/env[ \t]\\)?\\(-\\{1,2\\}[a-zA-Z1-9=]+[ \t]+\\)?\\([^ 
\t\n]+\\)")
   "Regexp matching interpreters, for file mode determination.
 This regular expression is matched against the first line of a 
 file
 to determine the file's mode in `set-auto-mode'.  If it matches, 
 the file
@@ -3445,7 +3445,7 @@ set-auto-mode
 	 (setq mode (save-excursion
 		      (goto-char (point-min))
 		      (if (looking-at 
 auto-mode-interpreter-regexp)
-			  (match-string 2))))
+			  (match-string 3))))
 	 ;; Map interpreter name to a mode, signaling we're done 
 at the
 	 ;; same time.
 	 (setq done (assoc-default

modified   lisp/progmodes/sh-script.el
@@ -1481,7 +1481,7 @@ sh--guess-shell
   (cond ((save-excursion
            (goto-char (point-min))
            (looking-at auto-mode-interpreter-regexp))
-         (match-string 2))
+         (match-string 3))
         ((not buffer-file-name) sh-shell-file)
         ;; Checks that use `buffer-file-name' follow.
         ((string-match "\\.m?spec\\'" buffer-file-name) "rpm")
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#64939; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Wilhelm Kirschbaum <wkirschbaum@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 30.0.50; The default auto-mode-interpreter-regexp does not match
 env with flags
Date: Sat, 29 Jul 2023 22:08:19 +0200
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A file without an extension will load ruby-mode if the first line 
is:

    #!/usr/bin/env ruby

but not when the first line is:

    #!/usr/bin/env -S ruby -e 'puts 123'

Is there any reason why the latter should not be matched by the 
default
`auto-mode-interpreter-regexp' value in 'files.el'?


A more useful example I stumbled on today while working on a 
language
server after adding:

`(add-to-list 'interpreter-mode-alist '("elixir" 
. elixir-ts-mode))'


    #!/usr/bin/env -S elixir --erl "-kernel standard_io_encoding 
    latin1"

    Node.start(:"next-ls-#{System.system_time()}", :shortnames)
    ....



Wilhelm
Acknowledgement sent to Wilhelm Kirschbaum <wkirschbaum@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#64939; Package emacs. Full text available.
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