From: "J.P." <jp@neverwas.me>
To: Eli Zaretskii <eliz@gnu.org>
Cc: stefankangas@gmail.com, 60730@debbugs.gnu.org
Subject: bug#60730: 29.0.60; Free variable with :buffer keyword in ert-with-temp-file
Date: Sun, 29 Jan 2023 06:08:01 -0800 [thread overview]
Message-ID: <87lelll9ha.fsf@neverwas.me> (raw)
In-Reply-To: <83k015976p.fsf@gnu.org> (Eli Zaretskii's message of "Sun, 29 Jan 2023 08:38:22 +0200")
Eli Zaretskii <eliz@gnu.org> writes:
>> "J.P." <jp@neverwas.me> writes:
>>
>> If, as you say, an argument to `:coding' should only ever be quoted, e.g.,
>>
>> :coding 'raw-text
>>
>> then `coding' will end up quoted as well, so something like this might
>> be enough:
>
> If you say so. The `', stuff looks strange to me, but the backticks
> in Emacs Lisp have always been black magic.
>
> What we need to ensure that both
>
> :coding 'raw-text
>
> and
>
> :coding some-coding-variable
>
> do work as expected, including when coding-system-for-write's value is
> a non-nil symbol of a coding-system.
Right, whatever the solution, it should cover those bases. Although, if
`some-coding-variable' evaluates to nil, the change I proposed would not
fall back on `coding-system-for-write'. (But perhaps it should? [1])
Also, thinking about this in earnest (for once), I'm unsure why we need
to capture the value of `coding-system-for-write' at expansion time.
Wouldn't it be preferable to defer evaluation until the test actually
runs? IOW, when the `:coding' keyword is absent, shouldn't the final
form contain
-> (let* ((coding-system-for-write coding-system-for-write) ...
or even
-> (let* (...
(meaning nothing)? If this "deferred" approach makes sense, perhaps
something like this will suffice:
diff --git a/lisp/emacs-lisp/ert-x.el b/lisp/emacs-lisp/ert-x.el
index 98a017c8a8e..2605fc22ddf 100644
--- a/lisp/emacs-lisp/ert-x.el
+++ b/lisp/emacs-lisp/ert-x.el
@@ -475,7 +475,7 @@ ert-with-temp-file
(:directory (setq directory (pop body)))
(:text (setq text (pop body)))
(:buffer (setq buffer (pop body)))
- (:coding (setq coding (pop body)))
+ (:coding (setq coding (list (pop body))))
(_ (push keyw extra-keywords) (pop body))))
(when extra-keywords
(error "Invalid keywords: %s" (mapconcat #'symbol-name extra-keywords " ")))
@@ -484,7 +484,7 @@ ert-with-temp-file
(suffix (or suffix ert-temp-file-suffix
(ert--with-temp-file-generate-suffix
(or (macroexp-file-name) buffer-file-name)))))
- `(let* ((coding-system-for-write ,(or coding coding-system-for-write))
+ `(let* (,@(and coding `((coding-system-for-write ,(car coding))))
(,temp-file (,(if directory 'file-name-as-directory 'identity)
(make-temp-file ,prefix ,directory ,suffix ,text)))
(,name ,(if directory
Note that with this change, `coding-system-for-write' would only be
bound when the user supplies a `:coding' argument, even if that argument
is nil [2]. Anyway, if this "deferred" stuff is simply wrongheaded,
please forget I ever mentioned it. Thanks.
[1] If incorporating such "fallback" behavior into the "deferred"
approach mentioned above is desirable, we could try something
like
diff --git a/lisp/emacs-lisp/ert-x.el b/lisp/emacs-lisp/ert-x.el
index 98a017c8a8e..3439aacf1ab 100644
--- a/lisp/emacs-lisp/ert-x.el
+++ b/lisp/emacs-lisp/ert-x.el
@@ -484,7 +484,7 @@ ert-with-temp-file
(suffix (or suffix ert-temp-file-suffix
(ert--with-temp-file-generate-suffix
(or (macroexp-file-name) buffer-file-name)))))
- `(let* ((coding-system-for-write ,(or coding coding-system-for-write))
+ `(let* ((coding-system-for-write (or ,coding coding-system-for-write))
(,temp-file (,(if directory 'file-name-as-directory 'identity)
(make-temp-file ,prefix ,directory ,suffix ,text)))
(,name ,(if directory
[2] My main concern with the "fallback" route is that the user loses a
rather convenient means of ignoring whatever value of
`coding-system-for-write' exists in their testing environment. IOW,
they cannot easily opt to favor the default selection procedure
mentioned in the doc string (for `c-s-f-w'). As a user of this
macro, I feel it might be handy to have the option of supplying a
literal nil (or a variable evaluating to nil) to signal such intent.
next prev parent reply other threads:[~2023-01-29 14:08 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-11 13:50 bug#60730: 29.0.60; Free variable with :buffer keyword in ert-with-temp-file J.P.
2023-01-13 1:56 ` Stefan Kangas
2023-01-28 14:13 ` J.P.
2023-01-28 15:03 ` Eli Zaretskii
2023-01-28 15:56 ` J.P.
2023-01-28 16:13 ` Eli Zaretskii
2023-01-29 2:00 ` J.P.
2023-01-29 4:35 ` J.P.
2023-01-29 6:38 ` Eli Zaretskii
2023-01-29 14:08 ` J.P. [this message]
2023-01-29 15:10 ` Eli Zaretskii
2023-01-29 16:18 ` J.P.
2023-01-29 6:28 ` Eli Zaretskii
2023-01-29 9:56 ` Andreas Schwab
2023-01-29 10:29 ` Eli Zaretskii
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