GNU bug report logs - #76242
[PATCH] Clarify that mapconcat's FUNCTION can return nil

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Package: emacs; Severity: wishlist; Reported by: Hong Xu <hong@HIDDEN>; Keywords: patch; dated Wed, 12 Feb 2025 22:29:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Severity set to 'wishlist' from 'normal' Request was from Stefan Kangas <stefankangas@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Michael Heerdegen <michael_heerdegen@HIDDEN>
To: Hong Xu via "Bug reports for GNU Emacs, the Swiss army knife of text
 editors" <bug-gnu-emacs@HIDDEN>
Subject: Re: bug#76242: [PATCH] Clarify that mapconcat's FUNCTION can return
 nil
In-Reply-To: <20250212222746.25672-1-hong@HIDDEN>
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Hong Xu via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs@HIDDEN> writes:

> -FUNCTION must be a function of one argument, and must return a value
> -  that is a sequence of characters: either a string, or a vector or
> -  list of numbers that are valid character codepoints.  */)
> + FUNCTION must be a function of one argument, and must return either:
> +
> +   nil, which is treated as an empty string, or
> +   a value that is a sequence of characters, which is either a string,
> +   or a vector or list of numbers that are valid character codepoints. */)

I don't understand the rationale.  Isn't nil just one case of an empty
sequence of characters?  Why describe it specially?


Michael.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#76242; Package emacs. Full text available.

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


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To: Hong Xu via "Bug reports for GNU Emacs, the Swiss army knife of text
 editors" <bug-gnu-emacs@HIDDEN>
Subject: Re: bug#76242: [PATCH] Clarify that mapconcat's FUNCTION can return
 nil
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Hong Xu via "Bug reports for GNU Emacs, the Swiss army knife of text
editors" <bug-gnu-emacs@HIDDEN> writes:

> -FUNCTION must be a function of one argument, and must return a value
> -  that is a sequence of characters: either a string, or a vector or
> -  list of numbers that are valid character codepoints.  */)
> + FUNCTION must be a function of one argument, and must return either:
> +
> +   nil, which is treated as an empty string, or
> +   a value that is a sequence of characters, which is either a string,
> +   or a vector or list of numbers that are valid character codepoints. */)

I don't understand the rationale.  Isn't nil just one case of an empty
sequence of characters?  Why describe it specially?


Michael.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#76242; Package emacs. Full text available.

Message received at 76242 <at> debbugs.gnu.org:


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From: Hong Xu <hong@HIDDEN>
To: 76242 <at> debbugs.gnu.org
Subject: Re: [PATCH] Clarify that mapconcat's FUNCTION can return nil
In-Reply-To: <20250212222746.25672-1-hong@HIDDEN> (Hong Xu's message of
 "Wed, 12 Feb 2025 14:27:03 -0800")
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Content-Type: text/plain

On 2025-02-12 Wed 14:27 GMT-08, Hong Xu <hong@HIDDEN> wrote:

> * src/fns.c (Fmapconcat): Explain that FUNCTION can return nil.
> ---
>  src/fns.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/src/fns.c b/src/fns.c
> index bee44b222c5e..f02a1b6838da 100644
> --- a/src/fns.c
> +++ b/src/fns.c
> @@ -3400,9 +3400,11 @@ SEQUENCE may be a list, a vector, a bool-vector, or a string.
>  Optional argument SEPARATOR must be a string, a vector, or a list of
>  characters; nil stands for the empty string.
>  
> -FUNCTION must be a function of one argument, and must return a value
> + FUNCTION must be a function of one argument, and must return either:

For some reason there is an extra space here. I've corrected this with
the attached patch.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: inline;
 filename=v2-0001-Clarify-that-mapconcat-s-FUNCTION-can-return-nil.patch

From 42b5c39abd1765efc286178d041c57623d722d0d Mon Sep 17 00:00:00 2001
From: Hong Xu <hong@HIDDEN>
Date: Wed, 12 Feb 2025 14:25:34 -0800
Subject: [PATCH v2] Clarify that mapconcat's FUNCTION can return nil

* src/fns.c (Fmapconcat): Explain that FUNCTION can return nil.
---
 src/fns.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/fns.c b/src/fns.c
index bee44b222c5e..fc7039c1592b 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -3400,9 +3400,11 @@ SEQUENCE may be a list, a vector, a bool-vector, or a string.
 Optional argument SEPARATOR must be a string, a vector, or a list of
 characters; nil stands for the empty string.
 
-FUNCTION must be a function of one argument, and must return a value
-  that is a sequence of characters: either a string, or a vector or
-  list of numbers that are valid character codepoints.  */)
+FUNCTION must be a function of one argument, and must return either:
+
+  nil, which is treated as an empty string, or
+  a value that is a sequence of characters, which is either a string,
+  or a vector or list of numbers that are valid character codepoints. */)
   (Lisp_Object function, Lisp_Object sequence, Lisp_Object separator)
 {
   USE_SAFE_ALLOCA;
-- 
2.48.1


--=-=-=
Content-Type: text/plain


-- 
Hong

--=-=-=--
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#76242; Package emacs. Full text available.

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From: Hong Xu <hong@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: [PATCH] Clarify that mapconcat's FUNCTION can return nil
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* src/fns.c (Fmapconcat): Explain that FUNCTION can return nil.
---
 src/fns.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/fns.c b/src/fns.c
index bee44b222c5e..f02a1b6838da 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -3400,9 +3400,11 @@ SEQUENCE may be a list, a vector, a bool-vector, or a string.
 Optional argument SEPARATOR must be a string, a vector, or a list of
 characters; nil stands for the empty string.
 
-FUNCTION must be a function of one argument, and must return a value
-  that is a sequence of characters: either a string, or a vector or
-  list of numbers that are valid character codepoints.  */)
+ FUNCTION must be a function of one argument, and must return either:
+
+   nil, which is treated as an empty string, or
+   a value that is a sequence of characters, which is either a string,
+   or a vector or list of numbers that are valid character codepoints. */)
   (Lisp_Object function, Lisp_Object sequence, Lisp_Object separator)
 {
   USE_SAFE_ALLOCA;
-- 
2.48.1
Acknowledgement sent to Hong Xu <hong@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#76242; Package emacs. Full text available.
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