GNU bug report logs - #8531
eshell backslash handling

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.0.50; shell-quote-argument shouldn't escape special characters
Date: Thu, 21 Apr 2011 09:23:13 +0200

Hi all,

(shell-quote-argument "Vidéos")
==> "Vid\\éos"

eshell:
ls (shell-quote-argument "Vidéos")
Vid\éos: No such file or directory



In GNU Emacs 24.0.50.1 (i686-pc-linux-gnu, GTK+ Version 2.22.0)
 of 2011-04-19 on thierry-MM061
Windowing system distributor `The X.Org Foundation', version 11.0.10900000
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-- 
A+ Thierry
Get my Gnupg key:
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Message #8 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
Cc: 8531 <at> debbugs.gnu.org
Subject: Re: bug#8531: 24.0.50;
	shell-quote-argument shouldn't escape special characters
Date: Thu, 21 Apr 2011 13:33:09 +0300

> From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
> Date: Thu, 21 Apr 2011 09:23:13 +0200
> 
> (shell-quote-argument "Vidéos")
> ==> "Vid\\éos"
> 
> eshell:
> ls (shell-quote-argument "Vidéos")
> Vid\éos: No such file or directory

Looks like a problem in Eshell: I have no problem with using the
result of shell-quote-argument in "M-!".

Message #11 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#8531: 24.0.50;
	shell-quote-argument shouldn't escape special characters
Date: Thu, 21 Apr 2011 14:10:49 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
>> Date: Thu, 21 Apr 2011 09:23:13 +0200
>> 
>> (shell-quote-argument "Vidéos")
>> ==> "Vid\\éos"
>> 
>> eshell:
>> ls (shell-quote-argument "Vidéos")
>> Vid\éos: No such file or directory
>
> Looks like a problem in Eshell:
No it is the same in M-x shell

> I have no problem with using the
> result of shell-quote-argument in "M-!".
Which result?
Which command?
I am speaking of escaping accentued characters "é, à etc..."
Why `shell-quote-argument' escape such characters?

-- 
A+ Thierry
Get my Gnupg key:
gpg --keyserver pgp.mit.edu --recv-keys 59F29997 

Message #14 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
Cc: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#8531: 24.0.50;
	shell-quote-argument shouldn't escape special characters
Date: Thu, 21 Apr 2011 16:04:37 +0300

> From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
> Date: Thu, 21 Apr 2011 14:10:49 +0200
> 
> > I have no problem with using the
> > result of shell-quote-argument in "M-!".
> Which result?
> Which command?

The command was "ls Vid\éos".  It displayed the files in that
directory.

> I am speaking of escaping accentued characters "é, à etc..."

Yes, so am I.

> Why `shell-quote-argument' escape such characters?

Because it wants to play safe.  In a Posix shell, any non-special
character preceded with a backslash stands for itself, I'm sure you
know that.  Backslash-escaping anything that is not in the Posix
character set avoids too much knowledge about the underlying shell's
special characters, and should be harmless if the escaped characters
are not special.

Message #17 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#8531: 24.0.50;
	shell-quote-argument shouldn't escape special characters
Date: Thu, 21 Apr 2011 15:31:41 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
>> Date: Thu, 21 Apr 2011 14:10:49 +0200
>> 
>> > I have no problem with using the
>> > result of shell-quote-argument in "M-!".
>> Which result?
>> Which command?
>
> The command was "ls Vid\éos".  It displayed the files in that
> directory.
Yes, but ls "Vid\éos" fail.

The point is being able to do something like this:
(shell-command (format "ls %s" (shell-quote-argument (read-string "Fname: "))))

instead of e.g
(shell-command (format "ls '%s'" (read-string "Fname: ")))


>> I am speaking of escaping accentued characters "é, à etc..."
>
> Yes, so am I.
Ok.
>> Why `shell-quote-argument' escape such characters?
>
> Because it wants to play safe.  In a Posix shell, any non-special
> character preceded with a backslash stands for itself, I'm sure you
> know that.  Backslash-escaping anything that is not in the Posix
> character set avoids too much knowledge about the underlying shell's
> special characters, and should be harmless if the escaped characters
> are not special.
Oh yes, i remember now that "é etc.." are not in posix character set,
thanks.

-- 
A+ Thierry
Get my Gnupg key:
gpg --keyserver pgp.mit.edu --recv-keys 59F29997 

Message #20 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
Cc: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#8531: 24.0.50;
	shell-quote-argument shouldn't escape special characters
Date: Thu, 21 Apr 2011 16:58:00 +0300

> From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
> Date: Thu, 21 Apr 2011 15:31:41 +0200
> 
> > The command was "ls Vid\éos".  It displayed the files in that
> > directory.
> Yes, but ls "Vid\éos" fail.

Where did the quotes come from?  shell-quote-argument doesn't add
extra quotes.

> The point is being able to do something like this:
> (shell-command (format "ls %s" (shell-quote-argument (read-string "Fname: "))))
> 
> instead of e.g
> (shell-command (format "ls '%s'" (read-string "Fname: ")))

The former works for me without any changes.  Are you sure you use the
default version of shell-quote-argument?

Message #23 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#8531: 24.0.50;
	shell-quote-argument shouldn't escape special characters
Date: Thu, 21 Apr 2011 18:34:37 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
>> Date: Thu, 21 Apr 2011 15:31:41 +0200
>> 
>> > The command was "ls Vid\éos".  It displayed the files in that
>> > directory.
>> Yes, but ls "Vid\éos" fail.
>
> Where did the quotes come from?  shell-quote-argument doesn't add
> extra quotes.
>
>> The point is being able to do something like this:
>> (shell-command (format "ls %s" (shell-quote-argument (read-string "Fname: "))))
>> 
>> instead of e.g
>> (shell-command (format "ls '%s'" (read-string "Fname: ")))
>
> The former works for me without any changes.  Are you sure you use the
> default version of shell-quote-argument?
Yes you're right, sorry, i was inserting ~/Vidéos.
So yes the problem is related only to eshell.

-- 
A+ Thierry
Get my Gnupg key:
gpg --keyserver pgp.mit.edu --recv-keys 59F29997 

Message #26 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
Cc: 8531 <at> debbugs.gnu.org
Subject: Re: bug#8531: 24.0.50;
	shell-quote-argument shouldn't escape special characters
Date: Thu, 21 Apr 2011 19:14:58 -0400

Thierry Volpiatto wrote:

> So yes the problem is related only to eshell.

Why do you want/need to call shell-quote-argument inside eshell?

Message #29 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 8531 <at> debbugs.gnu.org, thierry.volpiatto <at> gmail.com
Subject: Re: bug#8531: 24.0.50;
	shell-quote-argument shouldn't escape special characters
Date: Fri, 22 Apr 2011 01:53:35 -0400

> From: Glenn Morris <rgm <at> gnu.org>
> Date: Thu, 21 Apr 2011 19:14:58 -0400
> Cc: 8531 <at> debbugs.gnu.org
> 
> Thierry Volpiatto wrote:
> 
> > So yes the problem is related only to eshell.
> 
> Why do you want/need to call shell-quote-argument inside eshell?

He doesn't.  But a literal Vid\éos (with the backslash typed by hand)
doesn't work with Eshell, either.  Doesn't Eshell support the standard
shell feature whereby a non-special character escaped by a backslash
stands for itself?

Message #32 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 8531 <at> debbugs.gnu.org
Subject: Re: bug#8531: 24.0.50;
	shell-quote-argument shouldn't escape special characters
Date: Fri, 22 Apr 2011 08:03:30 +0200

Glenn Morris <rgm <at> gnu.org> writes:

> Thierry Volpiatto wrote:
>
>> So yes the problem is related only to eshell.
>
> Why do you want/need to call shell-quote-argument inside eshell?
For compatibility with Windows filenames:

--8<---------------cut here---------------start------------->8---
(goto-char (point-max))
(insert
 (format "cd '%s'" anything-ff-default-directory))
(eshell-send-input)))
--8<---------------cut here---------------end--------------->8---

As there is no evaluation inside the quotes,
this actually works fine, but before that, i wrote it with
shell-quote-argument, which was working fine excepted with accentued char.

-- 
A+ Thierry
Get my Gnupg key:
gpg --keyserver pgp.mit.edu --recv-keys 59F29997 

Message #35 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
Cc: rgm <at> gnu.org, 8531 <at> debbugs.gnu.org
Subject: Re: bug#8531: 24.0.50;
	shell-quote-argument shouldn't escape special characters
Date: Fri, 22 Apr 2011 02:15:36 -0400

> From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
> Date: Fri, 22 Apr 2011 08:03:30 +0200
> Cc: 8531 <at> debbugs.gnu.org
> 
> Glenn Morris <rgm <at> gnu.org> writes:
> 
> > Thierry Volpiatto wrote:
> >
> >> So yes the problem is related only to eshell.
> >
> > Why do you want/need to call shell-quote-argument inside eshell?
> For compatibility with Windows filenames:

You mean, file names with embedded white space?  If not, what other
compatibility issues are there?

Message #38 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 8531 <at> debbugs.gnu.org, thierry.volpiatto <at> gmail.com
Subject: Re: bug#8531: 24.0.50;
	shell-quote-argument shouldn't escape special characters
Date: Fri, 22 Apr 2011 03:10:39 -0400

Eli Zaretskii wrote:

> He doesn't.  But a literal Vid\éos (with the backslash typed by hand)
> doesn't work with Eshell, either.  Doesn't Eshell support the standard
> shell feature whereby a non-special character escaped by a backslash
> stands for itself?

From reading the comments in eshell-parse-backslash, no.

Message #41 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 8531 <at> debbugs.gnu.org, thierry.volpiatto <at> gmail.com
Subject: Re: bug#8531: 24.0.50;
	shell-quote-argument shouldn't escape special characters
Date: Fri, 22 Apr 2011 04:03:28 -0400

> From: Glenn Morris <rgm <at> gnu.org>
> Cc: thierry.volpiatto <at> gmail.com,  8531 <at> debbugs.gnu.org
> Date: Fri, 22 Apr 2011 03:10:39 -0400
> 
> Eli Zaretskii wrote:
> 
> > Doesn't Eshell support the standard shell feature whereby a
> > non-special character escaped by a backslash stands for itself?
> 
> From reading the comments in eshell-parse-backslash, no.

IMO, the reasons stated in those comments for not supporting escaped
non-special characters are bad a design decision.  Eshell should only
do that on Windows, and even then there should be a user option for
such behavior, the default being that the directory separator is a
forward slash.

IOW, Eshell should behave like a Posix shell, even on Windows.

Message #44 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: rgm <at> gnu.org, 8531 <at> debbugs.gnu.org
Subject: Re: bug#8531: 24.0.50;
	shell-quote-argument shouldn't escape special characters
Date: Fri, 22 Apr 2011 11:21:37 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Thierry Volpiatto <thierry.volpiatto <at> gmail.com>
>> Date: Fri, 22 Apr 2011 08:03:30 +0200
>> Cc: 8531 <at> debbugs.gnu.org
>> 
>> Glenn Morris <rgm <at> gnu.org> writes:
>> 
>> > Thierry Volpiatto wrote:
>> >
>> >> So yes the problem is related only to eshell.
>> >
>> > Why do you want/need to call shell-quote-argument inside eshell?
>> For compatibility with Windows filenames:
>
> You mean, file names with embedded white space?
Yes.

> If not, what other compatibility issues are there?
Nothing else for the moment.

-- 
A+ Thierry
Get my Gnupg key:
gpg --keyserver pgp.mit.edu --recv-keys 59F29997 

Message #51 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: samer <samer <at> samertm.com>
To: 8531 <at> debbugs.gnu.org
Subject: Re: bug#8531: 24.0.50;
Date: Mon, 08 Dec 2014 01:34:12 -0800

Hi,

I found this bug on debbugs thanks to Lars' getting started guide. This 
change simplifies the code by making the behavior that used occur for 
newlines following a backslash, returning the character literal after 
the backslash, the behavior that occurs for _all_ non-special 
characters.

This is my first contribution to emacs, so don't hesitate to correct 
anything nonstandard in the patch I've included. I'm interested in doing 
more work on eshell, too. What eshell bugs would benefit from a fresh 
pair of eyes?

Best,
Samer

Patch for esh-arg.el:

*** 
/home/samer/build/emacs120714/share/emacs/25.0.50/lisp/eshell/esh-arg.el.gz.old
--- 
/home/samer/build/emacs120714/share/emacs/25.0.50/lisp/eshell/esh-arg.el.gz
***************
*** 89,95 ****
  	  (goto-char (match-end 0))
  	  (eshell-finish-arg)))))

!    ;; backslash before a special character means escape it
     'eshell-parse-backslash

     ;; text beginning with ' is a literally quoted
--- 89,96 ----
  	  (goto-char (match-end 0))
  	  (eshell-finish-arg)))))

!    ;; backslash before a character escapes it if the character is
!    ;; special, and returns the character literal if it is non-special
     'eshell-parse-backslash

     ;; text beginning with ' is a literally quoted
***************
*** 282,294 ****
    "A stub function that generates an error if a floating operator is 
found."
    (error "Unhandled operator in input text"))

- (defsubst eshell-looking-at-backslash-return (pos)
-   "Test whether a backslash-return sequence occurs at POS."
-   (and (eq (char-after pos) ?\\)
-        (or (= (1+ pos) (point-max))
- 	   (and (eq (char-after (1+ pos)) ?\n)
- 		(= (+ pos 2) (point-max))))))
-
  (defun eshell-quote-backslash (string &optional index)
    "Intelligently backslash the character occurring in STRING at INDEX.
  If the character is itself a backslash, it needs no escaping."
--- 283,288 ----
***************
*** 305,313 ****
  	  (string ?\\ char)))))

  (defun eshell-parse-backslash ()
!   "Parse a single backslash (\) character, which might mean escape.
! It only means escape if the character immediately following is a
! special character that is not itself a backslash."
    (when (eq (char-after) ?\\)
      (if (eshell-looking-at-backslash-return (point))
  	(throw 'eshell-incomplete ?\\)
--- 299,309 ----
  	  (string ?\\ char)))))

  (defun eshell-parse-backslash ()
!   "Parse a single backslash (\) character to escape the character 
after.
! If the character immediately following the backslash is a special
! character, it returns the escaped version of that character.
! Else, the character has no meaning and is returned as the literal
! character. This conforms with the behavior of bash."
    (when (eq (char-after) ?\\)
      (if (eshell-looking-at-backslash-return (point))
  	(throw 'eshell-incomplete ?\\)
***************
*** 321,338 ****
  	    (forward-char 2)
  	    (list 'eshell-escape-arg
  		  (char-to-string (char-before))))
- 	;; allow \\<RET> to mean a literal "\" character followed by a
- 	;; normal return, rather than a backslash followed by a line
- 	;; continuation (i.e., "\\ + \n" rather than "\ + \\n").  This
- 	;; is necessary because backslashes in Eshell are not special
- 	;; unless they either precede something special, or precede a
- 	;; backslash that precedes something special.  (Mainly this is
- 	;; done to make using backslash on Windows systems more
- 	;; natural-feeling).
- 	(if (eshell-looking-at-backslash-return (1+ (point)))
- 	    (forward-char))
  	(forward-char)
! 	"\\"))))

  (defun eshell-parse-literal-quote ()
    "Parse a literally quoted string.  Nothing has special meaning!"
--- 317,325 ----
  	    (forward-char 2)
  	    (list 'eshell-escape-arg
  		  (char-to-string (char-before))))
  	(forward-char)
! 	(forward-char)
! 	(char-before)))))

  (defun eshell-parse-literal-quote ()
    "Parse a literally quoted string.  Nothing has special meaning!"

Diff finished.  Mon Dec  8 01:23:11 2014
*** 
/home/samer/build/emacs120714/share/emacs/25.0.50/lisp/eshell/esh-arg.el.gz.old
--- 
/home/samer/build/emacs120714/share/emacs/25.0.50/lisp/eshell/esh-arg.el.gz
***************
*** 89,95 ****
  	  (goto-char (match-end 0))
  	  (eshell-finish-arg)))))

!    ;; backslash before a special character means escape it
     'eshell-parse-backslash

     ;; text beginning with ' is a literally quoted
--- 89,96 ----
  	  (goto-char (match-end 0))
  	  (eshell-finish-arg)))))

!    ;; backslash before a character escapes it if the character is
!    ;; special, and returns the character literal if it is non-special
     'eshell-parse-backslash

     ;; text beginning with ' is a literally quoted
***************
*** 282,294 ****
    "A stub function that generates an error if a floating operator is 
found."
    (error "Unhandled operator in input text"))

- (defsubst eshell-looking-at-backslash-return (pos)
-   "Test whether a backslash-return sequence occurs at POS."
-   (and (eq (char-after pos) ?\\)
-        (or (= (1+ pos) (point-max))
- 	   (and (eq (char-after (1+ pos)) ?\n)
- 		(= (+ pos 2) (point-max))))))
-
  (defun eshell-quote-backslash (string &optional index)
    "Intelligently backslash the character occurring in STRING at INDEX.
  If the character is itself a backslash, it needs no escaping."
--- 283,288 ----
***************
*** 305,313 ****
  	  (string ?\\ char)))))

  (defun eshell-parse-backslash ()
!   "Parse a single backslash (\) character, which might mean escape.
! It only means escape if the character immediately following is a
! special character that is not itself a backslash."
    (when (eq (char-after) ?\\)
      (if (eshell-looking-at-backslash-return (point))
  	(throw 'eshell-incomplete ?\\)
--- 299,309 ----
  	  (string ?\\ char)))))

  (defun eshell-parse-backslash ()
!   "Parse a single backslash (\) character to escape the character 
after.
! If the character immediately following the backslash is a special
! character, it returns the escaped version of that character.
! Else, the character has no meaning and is returned as the literal
! character. This conforms with the behavior of bash."
    (when (eq (char-after) ?\\)
      (if (eshell-looking-at-backslash-return (point))
  	(throw 'eshell-incomplete ?\\)
***************
*** 321,338 ****
  	    (forward-char 2)
  	    (list 'eshell-escape-arg
  		  (char-to-string (char-before))))
- 	;; allow \\<RET> to mean a literal "\" character followed by a
- 	;; normal return, rather than a backslash followed by a line
- 	;; continuation (i.e., "\\ + \n" rather than "\ + \\n").  This
- 	;; is necessary because backslashes in Eshell are not special
- 	;; unless they either precede something special, or precede a
- 	;; backslash that precedes something special.  (Mainly this is
- 	;; done to make using backslash on Windows systems more
- 	;; natural-feeling).
- 	(if (eshell-looking-at-backslash-return (1+ (point)))
- 	    (forward-char))
  	(forward-char)
! 	"\\"))))

  (defun eshell-parse-literal-quote ()
    "Parse a literally quoted string.  Nothing has special meaning!"
--- 317,325 ----
  	    (forward-char 2)
  	    (list 'eshell-escape-arg
  		  (char-to-string (char-before))))
  	(forward-char)
! 	(forward-char)
! 	(char-before)))))

  (defun eshell-parse-literal-quote ()
    "Parse a literally quoted string.  Nothing has special meaning!"

Message #54 received at submit <at> debbugs.gnu.org (full text, mbox):

From: samer <samer <at> samertm.com>
To: bug-gnu-emacs <at> gnu.org
Subject: bug#8531: 24.0.50;	shell-quote-argument shouldn't escape special characters
Date: Mon, 08 Dec 2014 08:48:15 -0800

Hi,

I found this bug on debbugs thanks to Lars' getting started guide. This 
change simplifies the code by making the behavior that used occur for 
newlines following a backslash, returning the character literal after 
the backslash, the behavior that occurs for _all_ non-special 
characters.

This is my first contribution to emacs, so don't hesitate to correct 
anything nonstandard in the patch I've included. I'm interested in doing 
more work on eshell, too. What eshell bugs would benefit from a fresh 
pair of eyes?

Also, I sent this email to 8531 <at> debbugs.gnu.org five hours and I didn't 
see my email on debbugs. Apologies for the duplication if that email 
actually went through.

Best,
Samer

Patch for esh-arg.el:

*** 
/home/samer/build/emacs120714/share/emacs/25.0.50/lisp/eshell/esh-arg.el.gz.old
--- 
/home/samer/build/emacs120714/share/emacs/25.0.50/lisp/eshell/esh-arg.el.gz
***************
*** 89,95 ****
  	  (goto-char (match-end 0))
  	  (eshell-finish-arg)))))

!    ;; backslash before a special character means escape it
     'eshell-parse-backslash

     ;; text beginning with ' is a literally quoted
--- 89,96 ----
  	  (goto-char (match-end 0))
  	  (eshell-finish-arg)))))

!    ;; backslash before a character escapes it if the character is
!    ;; special, and returns the character literal if it is non-special
     'eshell-parse-backslash

     ;; text beginning with ' is a literally quoted
***************
*** 282,294 ****
    "A stub function that generates an error if a floating operator is 
found."
    (error "Unhandled operator in input text"))

- (defsubst eshell-looking-at-backslash-return (pos)
-   "Test whether a backslash-return sequence occurs at POS."
-   (and (eq (char-after pos) ?\\)
-        (or (= (1+ pos) (point-max))
- 	   (and (eq (char-after (1+ pos)) ?\n)
- 		(= (+ pos 2) (point-max))))))
-
  (defun eshell-quote-backslash (string &optional index)
    "Intelligently backslash the character occurring in STRING at INDEX.
  If the character is itself a backslash, it needs no escaping."
--- 283,288 ----
***************
*** 305,313 ****
  	  (string ?\\ char)))))

  (defun eshell-parse-backslash ()
!   "Parse a single backslash (\) character, which might mean escape.
! It only means escape if the character immediately following is a
! special character that is not itself a backslash."
    (when (eq (char-after) ?\\)
      (if (eshell-looking-at-backslash-return (point))
  	(throw 'eshell-incomplete ?\\)
--- 299,309 ----
  	  (string ?\\ char)))))

  (defun eshell-parse-backslash ()
!   "Parse a single backslash (\) character to escape the character 
after.
! If the character immediately following the backslash is a special
! character, it returns the escaped version of that character.
! Else, the character has no meaning and is returned as the literal
! character. This conforms with the behavior of bash."
    (when (eq (char-after) ?\\)
      (if (eshell-looking-at-backslash-return (point))
  	(throw 'eshell-incomplete ?\\)
***************
*** 321,338 ****
  	    (forward-char 2)
  	    (list 'eshell-escape-arg
  		  (char-to-string (char-before))))
- 	;; allow \\<RET> to mean a literal "\" character followed by a
- 	;; normal return, rather than a backslash followed by a line
- 	;; continuation (i.e., "\\ + \n" rather than "\ + \\n").  This
- 	;; is necessary because backslashes in Eshell are not special
- 	;; unless they either precede something special, or precede a
- 	;; backslash that precedes something special.  (Mainly this is
- 	;; done to make using backslash on Windows systems more
- 	;; natural-feeling).
- 	(if (eshell-looking-at-backslash-return (1+ (point)))
- 	    (forward-char))
  	(forward-char)
! 	"\\"))))

  (defun eshell-parse-literal-quote ()
    "Parse a literally quoted string.  Nothing has special meaning!"
--- 317,325 ----
  	    (forward-char 2)
  	    (list 'eshell-escape-arg
  		  (char-to-string (char-before))))
  	(forward-char)
! 	(forward-char)
! 	(char-before)))))

  (defun eshell-parse-literal-quote ()
    "Parse a literally quoted string.  Nothing has special meaning!"

Diff finished.  Mon Dec  8 01:23:11 2014
*** 
/home/samer/build/emacs120714/share/emacs/25.0.50/lisp/eshell/esh-arg.el.gz.old
--- 
/home/samer/build/emacs120714/share/emacs/25.0.50/lisp/eshell/esh-arg.el.gz
***************
*** 89,95 ****
  	  (goto-char (match-end 0))
  	  (eshell-finish-arg)))))

!    ;; backslash before a special character means escape it
     'eshell-parse-backslash

     ;; text beginning with ' is a literally quoted
--- 89,96 ----
  	  (goto-char (match-end 0))
  	  (eshell-finish-arg)))))

!    ;; backslash before a character escapes it if the character is
!    ;; special, and returns the character literal if it is non-special
     'eshell-parse-backslash

     ;; text beginning with ' is a literally quoted
***************
*** 282,294 ****
    "A stub function that generates an error if a floating operator is 
found."
    (error "Unhandled operator in input text"))

- (defsubst eshell-looking-at-backslash-return (pos)
-   "Test whether a backslash-return sequence occurs at POS."
-   (and (eq (char-after pos) ?\\)
-        (or (= (1+ pos) (point-max))
- 	   (and (eq (char-after (1+ pos)) ?\n)
- 		(= (+ pos 2) (point-max))))))
-
  (defun eshell-quote-backslash (string &optional index)
    "Intelligently backslash the character occurring in STRING at INDEX.
  If the character is itself a backslash, it needs no escaping."
--- 283,288 ----
***************
*** 305,313 ****
  	  (string ?\\ char)))))

  (defun eshell-parse-backslash ()
!   "Parse a single backslash (\) character, which might mean escape.
! It only means escape if the character immediately following is a
! special character that is not itself a backslash."
    (when (eq (char-after) ?\\)
      (if (eshell-looking-at-backslash-return (point))
  	(throw 'eshell-incomplete ?\\)
--- 299,309 ----
  	  (string ?\\ char)))))

  (defun eshell-parse-backslash ()
!   "Parse a single backslash (\) character to escape the character 
after.
! If the character immediately following the backslash is a special
! character, it returns the escaped version of that character.
! Else, the character has no meaning and is returned as the literal
! character. This conforms with the behavior of bash."
    (when (eq (char-after) ?\\)
      (if (eshell-looking-at-backslash-return (point))
  	(throw 'eshell-incomplete ?\\)
***************
*** 321,338 ****
  	    (forward-char 2)
  	    (list 'eshell-escape-arg
  		  (char-to-string (char-before))))
- 	;; allow \\<RET> to mean a literal "\" character followed by a
- 	;; normal return, rather than a backslash followed by a line
- 	;; continuation (i.e., "\\ + \n" rather than "\ + \\n").  This
- 	;; is necessary because backslashes in Eshell are not special
- 	;; unless they either precede something special, or precede a
- 	;; backslash that precedes something special.  (Mainly this is
- 	;; done to make using backslash on Windows systems more
- 	;; natural-feeling).
- 	(if (eshell-looking-at-backslash-return (1+ (point)))
- 	    (forward-char))
  	(forward-char)
! 	"\\"))))

  (defun eshell-parse-literal-quote ()
    "Parse a literally quoted string.  Nothing has special meaning!"
--- 317,325 ----
  	    (forward-char 2)
  	    (list 'eshell-escape-arg
  		  (char-to-string (char-before))))
  	(forward-char)
! 	(forward-char)
! 	(char-before)))))

  (defun eshell-parse-literal-quote ()
    "Parse a literally quoted string.  Nothing has special meaning!"

Message #57 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: samer <samer <at> samertm.com>
Cc: 8531 <at> debbugs.gnu.org
Subject: Re: bug#8531: 24.0.50;
Date: Mon, 08 Dec 2014 13:46:28 -0500

> I found this bug on debbugs thanks to Lars' getting started guide. This
> change simplifies the code by making the behavior that used occur for
> newlines following a backslash, returning the character literal after the
> backslash, the behavior that occurs for _all_ non-special characters.

This looks OK, thanks.  Please include an entry for etc/NEWS mentioning
the change in behavior and a description for the ChangeLog file.


        Stefan

Message #60 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: samer <samer <at> samertm.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#8531: 24.0.50;
Date: Mon, 08 Dec 2014 16:15:17 -0800

Forgot to CC debbugs in my previous email:

This is the full patch, generated with magit because I couldn't commit 
this to a private branch (I get "Empty change log entry" even though 
I've changed both ChangeLog files. I don't know awk, do you have any 
idea why I would get that error?)

Best,
Samer

Changes from master to working tree
4 files changed, 26 insertions(+), 22 deletions(-)
 etc/ChangeLog          |  4 ++++
 etc/NEWS               |  6 ++++++
 lisp/ChangeLog         |  7 +++++++
 lisp/eshell/esh-arg.el | 31 +++++++++----------------------

	Modified   etc/ChangeLog
diff --git a/etc/ChangeLog b/etc/ChangeLog
index 309c01f..3e76256 100644
--- a/etc/ChangeLog
+++ b/etc/ChangeLog
@@ -1,3 +1,7 @@
+2014-12-08  Samer Masterson  <samer <at> dark-horse>
+
+	* NEWS: Mention change in backslash expand behavior for eshell.
+
 2014-12-08  Lars Magne Ingebrigtsen  <larsi <at> gnus.org>

 	* NEWS: Mention the new eww `S' command.
	Modified   etc/NEWS
diff --git a/etc/NEWS b/etc/NEWS
index 56036f8..e6d9aab 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -192,6 +192,12 @@ result of the calculation into the current buffer.
 *** New minor mode global-eldoc-mode
 *** eldoc-documentation-function now defaults to nil

+** eshell
+
+*** Backslash (\) expands to the character literal after it if that
+character is non-special (e.g. 'b\in' expands to 'bin', because 'i' is
+not a special character). This behavior conforms with bash.
+
 ** eww

 +++
	Modified   lisp/ChangeLog
diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 2669e07..0ec9b35 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2014-12-08  Samer Masterson  <samer <at> samertm.com>
+
+	* eshell/esh-arg.el (eshell-parse-backslash): Return the literal
+	character after the backslash if the character is non-special
+	(bug#8531).
+	(eshell-looking-at-backslash-return): Unused, remove.
+
 2014-12-08  Lars Magne Ingebrigtsen  <larsi <at> gnus.org>

 	* net/nsm.el (nsm-check-protocol): Test for RC4 on `high'.
	Modified   lisp/eshell/esh-arg.el
diff --git a/lisp/eshell/esh-arg.el b/lisp/eshell/esh-arg.el
index 704de57..33ff384 100644
--- a/lisp/eshell/esh-arg.el
+++ b/lisp/eshell/esh-arg.el
@@ -89,7 +89,8 @@ yield the values intended."
 	  (goto-char (match-end 0))
 	  (eshell-finish-arg)))))

-   ;; backslash before a special character means escape it
+   ;; backslash before a character escapes it if the character is
+   ;; special, and returns the character literal if it is non-special
    'eshell-parse-backslash

    ;; text beginning with ' is a literally quoted
@@ -282,13 +283,6 @@ Point is left at the end of the arguments."
   "A stub function that generates an error if a floating operator is 
found."
   (error "Unhandled operator in input text"))

-(defsubst eshell-looking-at-backslash-return (pos)
-  "Test whether a backslash-return sequence occurs at POS."
-  (and (eq (char-after pos) ?\\)
-       (or (= (1+ pos) (point-max))
-	   (and (eq (char-after (1+ pos)) ?\n)
-		(= (+ pos 2) (point-max))))))
-
 (defun eshell-quote-backslash (string &optional index)
   "Intelligently backslash the character occurring in STRING at INDEX.
 If the character is itself a backslash, it needs no escaping."
@@ -305,9 +299,11 @@ If the character is itself a backslash, it needs no 
escaping."
 	  (string ?\\ char)))))

 (defun eshell-parse-backslash ()
-  "Parse a single backslash (\) character, which might mean escape.
-It only means escape if the character immediately following is a
-special character that is not itself a backslash."
+  "Parse a single backslash (\) character to escape the character 
after.
+If the character immediately following the backslash is a special
+character, it returns the escaped version of that character.
+Else, the character has no meaning and is returned as the literal
+character. This conforms with the behavior of bash."
   (when (eq (char-after) ?\\)
     (if (eshell-looking-at-backslash-return (point))
 	(throw 'eshell-incomplete ?\\)
@@ -321,18 +317,9 @@ special character that is not itself a backslash."
 	    (forward-char 2)
 	    (list 'eshell-escape-arg
 		  (char-to-string (char-before))))
-	;; allow \\<RET> to mean a literal "\" character followed by a
-	;; normal return, rather than a backslash followed by a line
-	;; continuation (i.e., "\\ + \n" rather than "\ + \\n").  This
-	;; is necessary because backslashes in Eshell are not special
-	;; unless they either precede something special, or precede a
-	;; backslash that precedes something special.  (Mainly this is
-	;; done to make using backslash on Windows systems more
-	;; natural-feeling).
-	(if (eshell-looking-at-backslash-return (1+ (point)))
-	    (forward-char))
 	(forward-char)
-	"\\"))))
+	(forward-char)
+	(char-before)))))

 (defun eshell-parse-literal-quote ()
   "Parse a literally quoted string.  Nothing has special meaning!"

Message #63 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
To: samer <samer <at> samertm.com>
Cc: 8531 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#8531: 24.0.50;
Date: Tue, 09 Dec 2014 01:41:29 +0100

samer <samer <at> samertm.com> writes:

> Forgot to CC debbugs in my previous email:

Looks good, I think.  Do you have FSF copyright assignment papers on file?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #68 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: samer <samer <at> samertm.com>
To: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
Cc: 8531 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#8531: 24.0.50;
Date: Mon, 08 Dec 2014 18:11:51 -0800

On 2014-12-08 16:41, Lars Magne Ingebrigtsen wrote:
> samer <samer <at> samertm.com> writes:
> 
>> Forgot to CC debbugs in my previous email:
> 
> Looks good, I think.  Do you have FSF copyright assignment papers on 
> file?

I don't, but I would be willing to assign my copyright to the FSF. How 
can we start that process?

Best,
Samer

Message #71 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
To: 8531 <at> debbugs.gnu.org
Subject: Re: bug#8531: 24.0.50;
Date: Tue, 09 Dec 2014 03:14:44 +0100

samer <samer <at> samertm.com> writes:

> I don't, but I would be willing to assign my copyright to the FSF. How
> can we start that process?

I've sent the assignment form off-list.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #74 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: samer <samer <at> samertm.com>
To: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
Cc: 8531 <at> debbugs.gnu.org, Stefan Monnier <monnier <at> iro.umontreal.ca>
Subject: Re: bug#8531: 24.0.50;
Date: Tue, 09 Dec 2014 14:11:15 -0800

I've sent an email to assign <at> gnu.org. What is the next step for getting 
this patch merged into Emacs?

Best,
Samer

Message #77 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
To: samer <samer <at> samertm.com>
Cc: 8531 <at> debbugs.gnu.org
Subject: Re: bug#8531: 24.0.50;
Date: Tue, 09 Dec 2014 23:21:44 +0100

samer <samer <at> samertm.com> writes:

> I've sent an email to assign <at> gnu.org. What is the next step for
> getting this patch merged into Emacs?

The copyright clerk will get in touch with you.  Once the paperwork is
finalised, follow up to this bug report, and we can get your patches
installed.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #80 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: samer <samer <at> samertm.com>
To: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
Cc: 8531 <at> debbugs.gnu.org
Subject: Re: bug#8531: 24.0.50;
Date: Tue, 09 Dec 2014 14:30:38 -0800

Alright, thanks!

Best,
Samer

On 2014-12-09 14:21, Lars Magne Ingebrigtsen wrote:
> samer <samer <at> samertm.com> writes:
> 
>> I've sent an email to assign <at> gnu.org. What is the next step for
>> getting this patch merged into Emacs?
> 
> The copyright clerk will get in touch with you.  Once the paperwork is
> finalised, follow up to this bug report, and we can get your patches
> installed.

Message #83 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Samer Masterson <samer <at> samertm.com>
To: 8531 <at> debbugs.gnu.org
Subject: Re: bug#8531: 24.0.50;
Date: Tue, 24 Feb 2015 02:51:29 -0800

[Message part 1 (text/plain, inline)]

Hi,

My copyright papers have been processed. Can we apply this to master?

Best,
Samer

Changes from master to working tree
4 files changed, 26 insertions(+), 22 deletions(-)
etc/ChangeLog          |  4 ++++
etc/NEWS               |  6 ++++++
lisp/ChangeLog         |  7 +++++++
lisp/eshell/esh-arg.el | 31 +++++++++----------------------

	Modified   etc/ChangeLog
diff --git a/etc/ChangeLog b/etc/ChangeLog
index 309c01f..3e76256 100644
--- a/etc/ChangeLog
+++ b/etc/ChangeLog
@@ -1,3 +1,7 @@
+2014-12-08  Samer Masterson  <samer <at> dark-horse>
+
+	* NEWS: Mention change in backslash expand behavior for eshell.
+
2014-12-08  Lars Magne Ingebrigtsen  <larsi <at> gnus.org>

	* NEWS: Mention the new eww `S' command.
	Modified   etc/NEWS
diff --git a/etc/NEWS b/etc/NEWS
index 56036f8..e6d9aab 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -192,6 +192,12 @@ result of the calculation into the current buffer.
*** New minor mode global-eldoc-mode
*** eldoc-documentation-function now defaults to nil

+** eshell
+
+*** Backslash (\) expands to the character literal after it if that
+character is non-special (e.g. 'b\in' expands to 'bin', because 'i' is
+not a special character). This behavior conforms with bash.
+
** eww

+++
	Modified   lisp/ChangeLog
diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 2669e07..0ec9b35 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2014-12-08  Samer Masterson  <samer <at> samertm.com>
+
+	* eshell/esh-arg.el (eshell-parse-backslash): Return the literal
+	character after the backslash if the character is non-special
+	(bug#8531).
+	(eshell-looking-at-backslash-return): Unused, remove.
+
2014-12-08  Lars Magne Ingebrigtsen  <larsi <at> gnus.org>

	* net/nsm.el (nsm-check-protocol): Test for RC4 on `high'.
	Modified   lisp/eshell/esh-arg.el
diff --git a/lisp/eshell/esh-arg.el b/lisp/eshell/esh-arg.el
index 704de57..33ff384 100644
--- a/lisp/eshell/esh-arg.el
+++ b/lisp/eshell/esh-arg.el
@@ -89,7 +89,8 @@ yield the values intended."
	  (goto-char (match-end 0))
	  (eshell-finish-arg)))))

-   ;; backslash before a special character means escape it
+   ;; backslash before a character escapes it if the character is
+   ;; special, and returns the character literal if it is non-special
   'eshell-parse-backslash

   ;; text beginning with ' is a literally quoted
@@ -282,13 +283,6 @@ Point is left at the end of the arguments."
  "A stub function that generates an error if a floating operator is
found."
  (error "Unhandled operator in input text"))

-(defsubst eshell-looking-at-backslash-return (pos)
-  "Test whether a backslash-return sequence occurs at POS."
-  (and (eq (char-after pos) ?\\)
-       (or (= (1+ pos) (point-max))
-	   (and (eq (char-after (1+ pos)) ?\n)
-		(= (+ pos 2) (point-max))))))
-
(defun eshell-quote-backslash (string &optional index)
  "Intelligently backslash the character occurring in STRING at INDEX.
If the character is itself a backslash, it needs no escaping."
@@ -305,9 +299,11 @@ If the character is itself a backslash, it needs no
escaping."
	  (string ?\\ char)))))

(defun eshell-parse-backslash ()
-  "Parse a single backslash (\) character, which might mean escape.
-It only means escape if the character immediately following is a
-special character that is not itself a backslash."
+  "Parse a single backslash (\) character to escape the character
after.
+If the character immediately following the backslash is a special
+character, it returns the escaped version of that character.
+Else, the character has no meaning and is returned as the literal
+character. This conforms with the behavior of bash."
  (when (eq (char-after) ?\\)
    (if (eshell-looking-at-backslash-return (point))
	(throw 'eshell-incomplete ?\\)
@@ -321,18 +317,9 @@ special character that is not itself a backslash."
	    (forward-char 2)
	    (list 'eshell-escape-arg
		  (char-to-string (char-before))))
-	;; allow \\<RET> to mean a literal "\" character followed by a
-	;; normal return, rather than a backslash followed by a line
-	;; continuation (i.e., "\\ + \n" rather than "\ + \\n").  This
-	;; is necessary because backslashes in Eshell are not special
-	;; unless they either precede something special, or precede a
-	;; backslash that precedes something special.  (Mainly this is
-	;; done to make using backslash on Windows systems more
-	;; natural-feeling).
-	(if (eshell-looking-at-backslash-return (1+ (point)))
-	    (forward-char))
	(forward-char)
-	"\\"))))
+	(forward-char)
+	(char-before)))))

(defun eshell-parse-literal-quote ()
  "Parse a literally quoted string.  Nothing has special meaning!"

[Message part 2 (text/html, inline)]

Message #86 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Samer Masterson <samer <at> samertm.com>
Cc: 8531 <at> debbugs.gnu.org
Subject: Re: bug#8531: 24.0.50;
Date: Tue, 03 Mar 2015 17:52:05 +0200

> Date: Tue, 24 Feb 2015 02:51:29 -0800
> From: Samer Masterson <samer <at> samertm.com>
> 
> Changes from master to working tree
> 4 files changed, 26 insertions(+), 22 deletions(-)
> etc/ChangeLog | 4 ++++
> etc/NEWS | 6 ++++++
> lisp/ChangeLog | 7 +++++++
> lisp/eshell/esh-arg.el | 31 +++++++++----------------------
> 
> Modified etc/ChangeLog
> diff --git a/etc/ChangeLog b/etc/ChangeLog
> index 309c01f..3e76256 100644
> --- a/etc/ChangeLog
> +++ b/etc/ChangeLog
> @@ -1,3 +1,7 @@
> +2014-12-08 Samer Masterson <samer <at> dark-horse>
> +
> + * NEWS: Mention change in backslash expand behavior for eshell.
> +
> 2014-12-08 Lars Magne Ingebrigtsen <larsi <at> gnus.org>
> 
> * NEWS: Mention the new eww `S' command.
> Modified etc/NEWS
> diff --git a/etc/NEWS b/etc/NEWS
> index 56036f8..e6d9aab 100644
> --- a/etc/NEWS
> +++ b/etc/NEWS
> @@ -192,6 +192,12 @@ result of the calculation into the current buffer.
> *** New minor mode global-eldoc-mode
> *** eldoc-documentation-function now defaults to nil
> 
> +** eshell
> +
> +*** Backslash (\) expands to the character literal after it if that
> +character is non-special (e.g. 'b\in' expands to 'bin', because 'i' is
> +not a special character). This behavior conforms with bash.

Thanks.

First, please leave 2 blanks between sentences (we use the US English
conventions for that).

More importantly, this patch doesn't really fix the original bug, does
it?  Apologies if I missed something.

Message #89 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Samer Masterson <samer <at> samertm.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 8531 <at> debbugs.gnu.org
Subject: Re: bug#8531: 24.0.50;
Date: Sun, 15 Mar 2015 04:58:58 -0700

Hi,

This is the updated patch. Thanks in advance for the review.

Just to clarify, the bug is that

    $ ls Vid\éos

doesn't do the right thing in eshell (it preserves the backslash if
the character after it is non-special). This diverges from POSIX and
Bash.

New behavior:

Outside of a double quoted string, the backslash escapes the following
charater if that character is special. Otherwise it simply returns the
character afterwards (the backslash is ignored).

I expanded `eshell-parse-backslash's behavior to match Bash for quoted
strings as well. Inside a double quoted string, the backslash escapes
the following character if that character is special, otherwise the
backslash is preserved.

Best,
Samer

Patch below:
[PATCH] Fix bug#8531

* eshell/esh-arg.el (eshell-parse-argument-hook): Update comment.
(eshell-parse-backslash): Return escaped character after backslash
if it is special.  Otherwise, if the backslash is not in a quoted
string, ignore the backslash and return the character after; if
the backslash is in a quoted string, return the backslash and the
character after.  (bug#8531)
* automated/eshell.el (eshell-test/escape-nonspecial)
(eshell-test/escape-nonspecial-unicode)
(eshell-test/escape-nonspecial-quoted)
(eshell-test/escape-special-quoted): Add tests for new
`eshell-parse-backslash' behavior.  (bug#8531)
---
 lisp/ChangeLog           |  9 +++++++++
 lisp/eshell/esh-arg.el   | 49 +++++++++++++++++++++---------------------------
 test/ChangeLog           |  8 ++++++++
 test/automated/eshell.el | 31 ++++++++++++++++++++++++++++++
 4 files changed, 69 insertions(+), 28 deletions(-)

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index a9cf1b0..209382d 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,12 @@
+2015-03-15  Samer Masterson  <samer <at> samertm.com>
+
+	* eshell/esh-arg.el (eshell-parse-argument-hook): Update comment.
+	(eshell-parse-backslash): Return escaped character after backslash
+	if it is special.  Otherwise, if the backslash is not in a quoted
+	string, ignore the backslash and return the character after; if
+	the backslash is in a quoted string, return the backslash and the
+	character after.  (bug#8531)
+
 2015-03-14  Michael R. Mauger  <michael <at> mauger.com>
 
 	* progmodes/sql.el: Version 3.5
diff --git a/lisp/eshell/esh-arg.el b/lisp/eshell/esh-arg.el
index 5c7d7ca..a5f697f 100644
--- a/lisp/eshell/esh-arg.el
+++ b/lisp/eshell/esh-arg.el
@@ -89,7 +89,7 @@ yield the values intended."
 	  (goto-char (match-end 0))
 	  (eshell-finish-arg)))))
 
-   ;; backslash before a special character means escape it
+   ;; parse backslash and the character after
    'eshell-parse-backslash
 
    ;; text beginning with ' is a literally quoted
@@ -305,34 +305,27 @@ If the character is itself a backslash, it needs no escaping."
 	  (string ?\\ char)))))
 
 (defun eshell-parse-backslash ()
-  "Parse a single backslash (\) character, which might mean escape.
-It only means escape if the character immediately following is a
-special character that is not itself a backslash."
+  "Parse a single backslash (\\) character and the character after.
+If the character after the backslash is special, always ignore
+the backslash and return the escaped character.
+
+Otherwise, if the backslash is not in quoted string, the
+backslash is ignored and the character after is returned.  If the
+backslash is in a quoted string, the backslash and the character
+after are both returned."
   (when (eq (char-after) ?\\)
-    (if (eshell-looking-at-backslash-return (point))
-	(throw 'eshell-incomplete ?\\)
-      (if (and (not (eq (char-after (1+ (point))) ?\\))
-	       (if eshell-current-quoted
-		   (memq (char-after (1+ (point)))
-			 eshell-special-chars-inside-quoting)
-		 (memq (char-after (1+ (point)))
-		       eshell-special-chars-outside-quoting)))
-	  (progn
-	    (forward-char 2)
-	    (list 'eshell-escape-arg
-		  (char-to-string (char-before))))
-	;; allow \\<RET> to mean a literal "\" character followed by a
-	;; normal return, rather than a backslash followed by a line
-	;; continuation (i.e., "\\ + \n" rather than "\ + \\n").  This
-	;; is necessary because backslashes in Eshell are not special
-	;; unless they either precede something special, or precede a
-	;; backslash that precedes something special.  (Mainly this is
-	;; done to make using backslash on Windows systems more
-	;; natural-feeling).
-	(if (eshell-looking-at-backslash-return (1+ (point)))
-	    (forward-char))
-	(forward-char)
-	"\\"))))
+    (when (eshell-looking-at-backslash-return (point))
+	(throw 'eshell-incomplete ?\\))
+    (forward-char 2) ; Move one char past the backslash.
+    ;; If the char is in a quote, backslash only has special meaning
+    ;; if it is escaping a special char.
+    (if eshell-current-quoted
+        (if (memq (char-before) eshell-special-chars-inside-quoting)
+            (list 'eshell-escape-arg (char-to-string (char-before)))
+          (concat "\\" (char-to-string (char-before))))
+      (if (memq (char-before) eshell-special-chars-outside-quoting)
+          (list 'eshell-escape-arg (char-to-string (char-before)))
+        (char-to-string (char-before))))))
 
 (defun eshell-parse-literal-quote ()
   "Parse a literally quoted string.  Nothing has special meaning!"
diff --git a/test/ChangeLog b/test/ChangeLog
index 6a474e1..ff2cd60 100644
--- a/test/ChangeLog
+++ b/test/ChangeLog
@@ -1,3 +1,11 @@
+2015-03-15  Samer Masterson  <samer <at> samertm.com>
+
+	* automated/eshell.el (eshell-test/escape-nonspecial)
+	(eshell-test/escape-nonspecial-unicode)
+	(eshell-test/escape-nonspecial-quoted)
+	(eshell-test/escape-special-quoted): Add tests for new
+	`eshell-parse-backslash' behavior.  (bug#8531)
+
 2015-03-10  Jackson Ray Hamilton  <jackson <at> jacksonrayhamilton.com>
 
 	* indent/js-indent-init-dynamic.js: Fix spelling error.
diff --git a/test/automated/eshell.el b/test/automated/eshell.el
index d51355f..81898db 100644
--- a/test/automated/eshell.el
+++ b/test/automated/eshell.el
@@ -166,6 +166,37 @@ e.g. \"{(+ 1 2)} 3\" => 3"
    (eshell-command-result-p "+ 1 2; + $_ 4"
                              "3\n6\n")))
 
+(ert-deftest eshell-test/escape-nonspecial ()
+  "Test that \"\\c\" and \"c\" are equivalent when \"c\" is not a
+special character."
+  (with-temp-eshell
+   (eshell-command-result-p "echo he\\llo"
+                            "hello\n")))
+
+(ert-deftest eshell-test/escape-nonspecial-unicode ()
+  "Test that \"\\c\" and \"c\" are equivalent when \"c\" is a
+unicode character (unicode characters are nonspecial by
+definition)."
+  (with-temp-eshell
+   (eshell-command-result-p "echo Vid\\éos"
+                            "Vidéos\n")))
+
+(ert-deftest eshell-test/escape-nonspecial-quoted ()
+  "Test that the backslash is preserved for escaped nonspecial
+chars"
+  (with-temp-eshell
+   (eshell-command-result-p "echo \"h\\i\""
+                            ;; Backslashes are doubled for regexp.
+                            "h\\\\i\n")))
+
+(ert-deftest eshell-test/escape-special-quoted ()
+  "Test that the backslash is not preserved for escaped special
+chars"
+  (with-temp-eshell
+   (eshell-command-result-p "echo \"h\\\\i\""
+                            ;; Backslashes are doubled for regexp.
+                            "h\\\\i\n")))
+
 (ert-deftest eshell-test/command-running-p ()
   "Modeline should show no command running"
   (with-temp-eshell

Message #92 received at 8531 <at> debbugs.gnu.org (full text, mbox):

From: Samer Masterson <samer <at> samertm.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 8531 <at> debbugs.gnu.org
Subject: Re: bug#8531: 24.0.50;
Date: Sun, 05 Apr 2015 20:50:50 -0700

Hi,

This is the updated patch. Thanks in advance for the review.

Just to clarify, the bug is that

    $ ls Vid\éos

doesn't do the right thing in eshell (it preserves the backslash if
the character after it is non-special). This diverges from POSIX and
Bash.

New behavior:

Outside of a double quoted string, the backslash escapes the following
charater if that character is special. Otherwise it simply returns the
character afterwards (the backslash is ignored).

I expanded `eshell-parse-backslash's behavior to match Bash for quoted
strings as well. Inside a double quoted string, the backslash escapes
the following character if that character is special, otherwise the
backslash is preserved.

Best,
Samer

(The date on the commit below is correct, I just forgot to send it to
the list).

patch below:

900b7a998e210ec260b136ea093c3eba3ce63f34 HEAD bug-8531
Author: Samer Masterson <samer <at> samertm.com>
Date:   Sun Mar 15 04:01:58 2015 -0700

    Fix bug#8531
    
    * eshell/esh-arg.el (eshell-parse-argument-hook): Update comment.
    (eshell-parse-backslash): Return escaped character after backslash
    if it is special.  Otherwise, if the backslash is not in a quoted
    string, ignore the backslash and return the character after; if
    the backslash is in a quoted string, return the backslash and the
    character after.  (bug#8531)
    * automated/eshell.el (eshell-test/escape-nonspecial)
    (eshell-test/escape-nonspecial-unicode)
    (eshell-test/escape-nonspecial-quoted)
    (eshell-test/escape-special-quoted): Add tests for new
    `eshell-parse-backslash' behavior.  (bug#8531)

4 files changed, 69 insertions(+), 28 deletions(-)
 lisp/ChangeLog           |  9 +++++++++
 lisp/eshell/esh-arg.el   | 49 +++++++++++++++++++++---------------------------
 test/ChangeLog           |  8 ++++++++
 test/automated/eshell.el | 31 ++++++++++++++++++++++++++++++

	Modified   lisp/ChangeLog
diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index a9cf1b0..209382d 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,12 @@
+2015-03-15  Samer Masterson  <samer <at> samertm.com>
+
+	* eshell/esh-arg.el (eshell-parse-argument-hook): Update comment.
+	(eshell-parse-backslash): Return escaped character after backslash
+	if it is special.  Otherwise, if the backslash is not in a quoted
+	string, ignore the backslash and return the character after; if
+	the backslash is in a quoted string, return the backslash and the
+	character after.  (bug#8531)
+
 2015-03-14  Michael R. Mauger  <michael <at> mauger.com>
 
 	* progmodes/sql.el: Version 3.5
	Modified   lisp/eshell/esh-arg.el
diff --git a/lisp/eshell/esh-arg.el b/lisp/eshell/esh-arg.el
index 5c7d7ca..a5f697f 100644
--- a/lisp/eshell/esh-arg.el
+++ b/lisp/eshell/esh-arg.el
@@ -89,7 +89,7 @@ yield the values intended."
 	  (goto-char (match-end 0))
 	  (eshell-finish-arg)))))
 
-   ;; backslash before a special character means escape it
+   ;; parse backslash and the character after
    'eshell-parse-backslash
 
    ;; text beginning with ' is a literally quoted
@@ -305,34 +305,27 @@ If the character is itself a backslash, it needs no escaping."
 	  (string ?\\ char)))))
 
 (defun eshell-parse-backslash ()
-  "Parse a single backslash (\) character, which might mean escape.
-It only means escape if the character immediately following is a
-special character that is not itself a backslash."
+  "Parse a single backslash (\\) character and the character after.
+If the character after the backslash is special, always ignore
+the backslash and return the escaped character.
+
+Otherwise, if the backslash is not in quoted string, the
+backslash is ignored and the character after is returned.  If the
+backslash is in a quoted string, the backslash and the character
+after are both returned."
   (when (eq (char-after) ?\\)
-    (if (eshell-looking-at-backslash-return (point))
-	(throw 'eshell-incomplete ?\\)
-      (if (and (not (eq (char-after (1+ (point))) ?\\))
-	       (if eshell-current-quoted
-		   (memq (char-after (1+ (point)))
-			 eshell-special-chars-inside-quoting)
-		 (memq (char-after (1+ (point)))
-		       eshell-special-chars-outside-quoting)))
-	  (progn
-	    (forward-char 2)
-	    (list 'eshell-escape-arg
-		  (char-to-string (char-before))))
-	;; allow \\<RET> to mean a literal "\" character followed by a
-	;; normal return, rather than a backslash followed by a line
-	;; continuation (i.e., "\\ + \n" rather than "\ + \\n").  This
-	;; is necessary because backslashes in Eshell are not special
-	;; unless they either precede something special, or precede a
-	;; backslash that precedes something special.  (Mainly this is
-	;; done to make using backslash on Windows systems more
-	;; natural-feeling).
-	(if (eshell-looking-at-backslash-return (1+ (point)))
-	    (forward-char))
-	(forward-char)
-	"\\"))))
+    (when (eshell-looking-at-backslash-return (point))
+	(throw 'eshell-incomplete ?\\))
+    (forward-char 2) ; Move one char past the backslash.
+    ;; If the char is in a quote, backslash only has special meaning
+    ;; if it is escaping a special char.
+    (if eshell-current-quoted
+        (if (memq (char-before) eshell-special-chars-inside-quoting)
+            (list 'eshell-escape-arg (char-to-string (char-before)))
+          (concat "\\" (char-to-string (char-before))))
+      (if (memq (char-before) eshell-special-chars-outside-quoting)
+          (list 'eshell-escape-arg (char-to-string (char-before)))
+        (char-to-string (char-before))))))
 
 (defun eshell-parse-literal-quote ()
   "Parse a literally quoted string.  Nothing has special meaning!"
	Modified   test/ChangeLog
diff --git a/test/ChangeLog b/test/ChangeLog
index 6a474e1..ff2cd60 100644
--- a/test/ChangeLog
+++ b/test/ChangeLog
@@ -1,3 +1,11 @@
+2015-03-15  Samer Masterson  <samer <at> samertm.com>
+
+	* automated/eshell.el (eshell-test/escape-nonspecial)
+	(eshell-test/escape-nonspecial-unicode)
+	(eshell-test/escape-nonspecial-quoted)
+	(eshell-test/escape-special-quoted): Add tests for new
+	`eshell-parse-backslash' behavior.  (bug#8531)
+
 2015-03-10  Jackson Ray Hamilton  <jackson <at> jacksonrayhamilton.com>
 
 	* indent/js-indent-init-dynamic.js: Fix spelling error.
	Modified   test/automated/eshell.el
diff --git a/test/automated/eshell.el b/test/automated/eshell.el
index d51355f..81898db 100644
--- a/test/automated/eshell.el
+++ b/test/automated/eshell.el
@@ -166,6 +166,37 @@ e.g. \"{(+ 1 2)} 3\" => 3"
    (eshell-command-result-p "+ 1 2; + $_ 4"
                              "3\n6\n")))
 
+(ert-deftest eshell-test/escape-nonspecial ()
+  "Test that \"\\c\" and \"c\" are equivalent when \"c\" is not a
+special character."
+  (with-temp-eshell
+   (eshell-command-result-p "echo he\\llo"
+                            "hello\n")))
+
+(ert-deftest eshell-test/escape-nonspecial-unicode ()
+  "Test that \"\\c\" and \"c\" are equivalent when \"c\" is a
+unicode character (unicode characters are nonspecial by
+definition)."
+  (with-temp-eshell
+   (eshell-command-result-p "echo Vid\\éos"
+                            "Vidéos\n")))
+
+(ert-deftest eshell-test/escape-nonspecial-quoted ()
+  "Test that the backslash is preserved for escaped nonspecial
+chars"
+  (with-temp-eshell
+   (eshell-command-result-p "echo \"h\\i\""
+                            ;; Backslashes are doubled for regexp.
+                            "h\\\\i\n")))
+
+(ert-deftest eshell-test/escape-special-quoted ()
+  "Test that the backslash is not preserved for escaped special
+chars"
+  (with-temp-eshell
+   (eshell-command-result-p "echo \"h\\\\i\""
+                            ;; Backslashes are doubled for regexp.
+                            "h\\\\i\n")))
+
 (ert-deftest eshell-test/command-running-p ()
   "Modeline should show no command running"
   (with-temp-eshell

Message #97 received at 8531-done <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Samer Masterson <samer <at> samertm.com>
Cc: 8531-done <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: bug#8531: 24.0.50;
Date: Wed, 08 Apr 2015 22:32:15 -0400

> This is the updated patch. Thanks in advance for the review.

Thanks, installed,


        Stefan

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