* bug#27361: 24.4; eshell/echo silently ignores -n argument
@ 2017-06-14 16:15 Phil Hagelberg
2017-06-19 4:11 ` npostavs
0 siblings, 1 reply; 9+ messages in thread
From: Phil Hagelberg @ 2017-06-14 16:15 UTC (permalink / raw)
To: 27361
When using eshell, the `echo' built-in doesn't respect the -n argument,
which is supposed to suppress the trailing newline.
Sometimes this is not a problem because you can see for yourself that
eshell did the wrong thing, but if you are piping it directly to another
command, it's easy to miss.
The eshell/echo function should be changed to either accept the -n
argument and omit the newline, or it should complain that -n is not a
supported argument.
In GNU Emacs 24.4.1 (x86_64-pc-linux-gnu, GTK+ Version 3.14.5)
of 2015-03-07 on trouble, modified by Debian
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^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#27361: 24.4; eshell/echo silently ignores -n argument
2017-06-14 16:15 bug#27361: 24.4; eshell/echo silently ignores -n argument Phil Hagelberg
@ 2017-06-19 4:11 ` npostavs
2017-06-19 15:22 ` Phil Hagelberg
0 siblings, 1 reply; 9+ messages in thread
From: npostavs @ 2017-06-19 4:11 UTC (permalink / raw)
To: Phil Hagelberg; +Cc: 27361
Phil Hagelberg <phil@hagelb.org> writes:
> When using eshell, the `echo' built-in doesn't respect the -n argument,
> which is supposed to suppress the trailing newline.
>
> Sometimes this is not a problem because you can see for yourself that
> eshell did the wrong thing, but if you are piping it directly to another
> command, it's easy to miss.
>
> The eshell/echo function should be changed to either accept the -n
> argument and omit the newline, or it should complain that -n is not a
> supported argument.
It's not ignored, but eshell always adds a newline before the prompt.
Furthermore, the argument has the opposite sense to the traditional
shell interpretation:
~/src $ echo x | od -c
0000000 x
0000001
~/src $ echo -n x | od -c
0000000 x \n
0000002
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#27361: 24.4; eshell/echo silently ignores -n argument
2017-06-19 4:11 ` npostavs
@ 2017-06-19 15:22 ` Phil Hagelberg
2017-06-20 1:57 ` Glenn Morris
0 siblings, 1 reply; 9+ messages in thread
From: Phil Hagelberg @ 2017-06-19 15:22 UTC (permalink / raw)
To: npostavs; +Cc: 27361
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npostavs@users.sourceforge.net writes:
> It's not ignored, but eshell always adds a newline before the prompt.
> Furthermore, the argument has the opposite sense to the traditional
> shell interpretation
Ah, I see. Yeah, doing the opposite of what the user asked for in both
cases is much worse than simply ignoring the argument when it's present.
-Phil
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^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#27361: 24.4; eshell/echo silently ignores -n argument
2017-06-19 15:22 ` Phil Hagelberg
@ 2017-06-20 1:57 ` Glenn Morris
2017-06-20 2:17 ` Glenn Morris
0 siblings, 1 reply; 9+ messages in thread
From: Glenn Morris @ 2017-06-20 1:57 UTC (permalink / raw)
To: Phil Hagelberg; +Cc: 27361, npostavs
echo -n is famously non-portable.
Perhaps eshell is trying to make a point. ;)
echo --help does document the -n behaviour, and it's been like that
since always.
With eshell-plain-echo-behavior set, -n is simply ignored.
I would have thought you must have eshell-plain-echo-behavior set
if you want anything like "standard" echo behaviour.
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#27361: 24.4; eshell/echo silently ignores -n argument
2017-06-20 1:57 ` Glenn Morris
@ 2017-06-20 2:17 ` Glenn Morris
2020-09-15 15:27 ` Lars Ingebrigtsen
0 siblings, 1 reply; 9+ messages in thread
From: Glenn Morris @ 2017-06-20 2:17 UTC (permalink / raw)
To: Phil Hagelberg; +Cc: 27361, npostavs
It seems easy to get the behaviour that you want, for the
eshell-plain-echo-behavior case, which is the only relevant one.
At the same time, we can fix eshell/printnl for that case,
to avoid the doubled newlines that it currently gives.
I don't know how to explain in --help what -n means though. :)
--- a/lisp/eshell/em-basic.el
+++ b/lisp/eshell/em-basic.el
@@ -88,7 +88,8 @@ eshell-echo
It returns a formatted value that should be passed to `eshell-print'
or `eshell-printn' for display."
(if eshell-plain-echo-behavior
- (concat (apply 'eshell-flatten-and-stringify args) "\n")
+ (concat (apply 'eshell-flatten-and-stringify args)
+ (unless output-newline "\n"))
(let ((value
(cond
((= (length args) 0) "")
@@ -126,7 +127,8 @@ eshell/printnl
"Print out each of the arguments, separated by newlines."
(let ((elems (eshell-flatten-list args)))
(while elems
- (eshell-printn (eshell-echo (list (car elems))))
+ (eshell-printn (eshell-echo (list (car elems))
+ eshell-plain-echo-behavior))
(setq elems (cdr elems)))))
(defun eshell/listify (&rest args)
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#27361: 24.4; eshell/echo silently ignores -n argument
2017-06-20 2:17 ` Glenn Morris
@ 2020-09-15 15:27 ` Lars Ingebrigtsen
2022-01-16 7:19 ` bug#27361: " Jim Porter
0 siblings, 1 reply; 9+ messages in thread
From: Lars Ingebrigtsen @ 2020-09-15 15:27 UTC (permalink / raw)
To: Glenn Morris; +Cc: 27361, Phil Hagelberg, npostavs
Glenn Morris <rgm@gnu.org> writes:
> It seems easy to get the behaviour that you want, for the
> eshell-plain-echo-behavior case, which is the only relevant one.
> At the same time, we can fix eshell/printnl for that case,
> to avoid the doubled newlines that it currently gives.
>
> I don't know how to explain in --help what -n means though. :)
[...]
> - (concat (apply 'eshell-flatten-and-stringify args) "\n")
> + (concat (apply 'eshell-flatten-and-stringify args)
> + (unless output-newline "\n"))
Hm... with or without the patch, and with eshell-plain-echo-behavior
set, I don't see any difference?
I still get this in eshell:
~/src/emacs/trunk $ echo -n foo; echo bar
foo
bar
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#27361: Re: bug#27361: 24.4; eshell/echo silently ignores -n argument
2020-09-15 15:27 ` Lars Ingebrigtsen
@ 2022-01-16 7:19 ` Jim Porter
2022-01-20 9:36 ` Lars Ingebrigtsen
0 siblings, 1 reply; 9+ messages in thread
From: Jim Porter @ 2022-01-16 7:19 UTC (permalink / raw)
To: Lars Ingebrigtsen; +Cc: Glenn Morris, 27361
[-- Attachment #1: Type: text/plain, Size: 1844 bytes --]
On 9/15/2020 8:27 AM, Lars Ingebrigtsen wrote:
> Glenn Morris <rgm@gnu.org> writes:
>
>> - (concat (apply 'eshell-flatten-and-stringify args) "\n")
>> + (concat (apply 'eshell-flatten-and-stringify args)
>> + (unless output-newline "\n"))
>
> Hm... with or without the patch, and with eshell-plain-echo-behavior
> set, I don't see any difference?
>
> I still get this in eshell:
>
> ~/src/emacs/trunk $ echo -n foo; echo bar
> foo
> bar
I think this is due to `eshell-lisp-command' insisting that a newline is
inserted after the output of *every* Lisp command (when executed
interactively). It's easier to see what "-n" does by eval'ing:
(eshell-command-result "echo hi")
;; and
(eshell-command-result "echo -n hi")
One solution to this bug would be to set `eshell-ensure-newline-p' to
nil inside `eshell-echo'; then it will opt out of `eshell-lisp-command's
trailing-newline insertion.
I've attached a patch that does this, as well as (hopefully) resolving
the unusual meaning of "-n" when echo outputs a Lisp-friendly result
(i.e. when `eshell-plain-echo-behavior' is nil). Now, it warns the user
to use "-N" instead if they want to add a trailing newline. Then, one
day, the old meaning of "-n" can be removed. I'm not sure if this is the
best way to emit a warning about this though; I wanted something that
doesn't interfere with any Eshell scripts, but `display-warning' is a
bit in-your-face.
I also simplified the logic of `eshell/printnl'. Since the way it called
`eshell-echo' always resulted in it printing the stringified form of
each argument, it's simpler just to call `eshell-stringify' directly.
Finally, I added a bit more detail about echo to the Eshell manual
(taken partly from the commentary of eshell/em-basic.el), since I didn't
quite understand its behavior initially.
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From 45d10c678a3c58486e0571d3c3e8ce64feb39299 Mon Sep 17 00:00:00 2001
From: Jim Porter <jporterbugs@gmail.com>
Date: Sat, 15 Jan 2022 15:16:31 -0800
Subject: [PATCH] In Eshell, allow "-n" to suppress the trailing newline for
"plain" echo
In addition, add a "-N" option to explicitly request a newline.
* lisp/eshell/em-basic.el (eshell-echo): Respect OUTPUT-NEWLINE even
when 'eshell-plain-echo-behavior' is non-nil.
(eshell/echo): Add "-N" option and recommend its use over "-n" in
Lisp-friendly echo.
(eshell/printnl): Simplify; 'eshell-stringify' is equivalent to
calling 'eshell-echo' here.
* doc/misc/eshell.texi (Built-in commands): Expand on the
documentation of echo.
---
doc/misc/eshell.texi | 13 ++++++++++---
lisp/eshell/em-basic.el | 30 ++++++++++++++++++++++--------
2 files changed, 32 insertions(+), 11 deletions(-)
diff --git a/doc/misc/eshell.texi b/doc/misc/eshell.texi
index f1d7c63805..df6e3b861e 100644
--- a/doc/misc/eshell.texi
+++ b/doc/misc/eshell.texi
@@ -407,9 +407,16 @@ Built-ins
@item echo
@cmindex echo
-Echoes its input. If @code{eshell-plain-echo-behavior} is
-non-@code{nil}, @command{echo} will try to behave more like a plain
-shell's @command{echo}.
+Echoes its input. By default, this prints in a Lisp-friendly fashion
+(so that the value is useful to a Lisp command using the result of
+@command{echo} as an argument). If a single argument is passed,
+@command{echo} prints that; if multiple arguments are passed, it
+prints a list of all the arguments; otherwise, it prints the empty
+string.
+
+If @code{eshell-plain-echo-behavior} is non-@code{nil}, @command{echo}
+will try to behave more like a plain shell's @command{echo}, printing
+each argument as a string, separated by a space.
@item env
@cmindex env
diff --git a/lisp/eshell/em-basic.el b/lisp/eshell/em-basic.el
index 27b343ad39..d3b15c900b 100644
--- a/lisp/eshell/em-basic.el
+++ b/lisp/eshell/em-basic.el
@@ -82,7 +82,11 @@ eshell-echo
It returns a formatted value that should be passed to `eshell-print'
or `eshell-printn' for display."
(if eshell-plain-echo-behavior
- (concat (apply 'eshell-flatten-and-stringify args) "\n")
+ (progn
+ ;; If the output does not end in a newline, do not emit one.
+ (setq eshell-ensure-newline-p nil)
+ (concat (apply #'eshell-flatten-and-stringify args)
+ (when output-newline "\n")))
(let ((value
(cond
((= (length args) 0) "")
@@ -109,18 +113,28 @@ eshell/echo
"Implementation of `echo'. See `eshell-plain-echo-behavior'."
(eshell-eval-using-options
"echo" args
- '((?n nil nil output-newline "terminate with a newline")
+ '((?n nil (nil) output-newline "do not output the trailing newline")
+ (?N nil (t) output-newline "terminate with a newline")
(?h "help" nil nil "output this help screen")
:preserve-args
- :usage "[-n] [object]")
- (eshell-echo args output-newline)))
+ :usage "[-n | -N] [object]")
+ (if eshell-plain-echo-behavior
+ (eshell-echo args (if output-newline (car output-newline) t))
+ ;; In Emacs 28.1 and earlier, "-n" was used to add a newline to
+ ;; non-plain echo in Eshell. This caused confusion due to "-n"
+ ;; generally having the opposite meaning for echo. Retain this
+ ;; compatibility for the time being. For more info, see
+ ;; bug#27361.
+ (when (equal output-newline '(nil))
+ (display-warning
+ :warning "To terminate with a newline, you should use -N instead."))
+ (eshell-echo args output-newline))))
(defun eshell/printnl (&rest args)
- "Print out each of the arguments, separated by newlines."
+ "Print out each of the arguments as strings, separated by newlines."
(let ((elems (flatten-tree args)))
- (while elems
- (eshell-printn (eshell-echo (list (car elems))))
- (setq elems (cdr elems)))))
+ (dolist (elem elems)
+ (eshell-printn (eshell-stringify elem)))))
(defun eshell/listify (&rest args)
"Return the argument(s) as a single list."
--
2.25.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* bug#27361: Re: bug#27361: 24.4; eshell/echo silently ignores -n argument
2022-01-16 7:19 ` bug#27361: " Jim Porter
@ 2022-01-20 9:36 ` Lars Ingebrigtsen
2022-01-21 1:27 ` Jim Porter
0 siblings, 1 reply; 9+ messages in thread
From: Lars Ingebrigtsen @ 2022-01-20 9:36 UTC (permalink / raw)
To: Jim Porter; +Cc: Glenn Morris, 27361
Jim Porter <jporterbugs@gmail.com> writes:
> I've attached a patch that does this, as well as (hopefully) resolving
> the unusual meaning of "-n" when echo outputs a Lisp-friendly result
> (i.e. when `eshell-plain-echo-behavior' is nil). Now, it warns the
Thanks; applied to Emacs 29.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
^ permalink raw reply [flat|nested] 9+ messages in thread
* bug#27361: Re: bug#27361: 24.4; eshell/echo silently ignores -n argument
2022-01-20 9:36 ` Lars Ingebrigtsen
@ 2022-01-21 1:27 ` Jim Porter
0 siblings, 0 replies; 9+ messages in thread
From: Jim Porter @ 2022-01-21 1:27 UTC (permalink / raw)
To: Lars Ingebrigtsen; +Cc: Glenn Morris, 27361
On 1/20/2022 1:36 AM, Lars Ingebrigtsen wrote:
> Jim Porter <jporterbugs@gmail.com> writes:
>
>> I've attached a patch that does this, as well as (hopefully) resolving
>> the unusual meaning of "-n" when echo outputs a Lisp-friendly result
>> (i.e. when `eshell-plain-echo-behavior' is nil). Now, it warns the
>
> Thanks; applied to Emacs 29.
Thanks. Hopefully the warning about using "-n" with Lisp-friendly echo
isn't too obtrusive for people, but if it is, we could probably replace
it with `message'.
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2022-01-21 1:27 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2017-06-14 16:15 bug#27361: 24.4; eshell/echo silently ignores -n argument Phil Hagelberg
2017-06-19 4:11 ` npostavs
2017-06-19 15:22 ` Phil Hagelberg
2017-06-20 1:57 ` Glenn Morris
2017-06-20 2:17 ` Glenn Morris
2020-09-15 15:27 ` Lars Ingebrigtsen
2022-01-16 7:19 ` bug#27361: " Jim Porter
2022-01-20 9:36 ` Lars Ingebrigtsen
2022-01-21 1:27 ` Jim Porter
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