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From: Paul Moore
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Subject: bug#23689: Daemon-mode on Windows - "w32-initialized" is set too early
Date: Sat, 4 Jun 2016 13:54:59 +0100
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To: Eli Zaretskii
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On 4 June 2016 at 11:58, Eli Zaretskii wrote:
> Frankly, I'm not sure what is the situation for which you want to
> test. Can you describe the original problem in more detail?
Sure. The issue arises with Spacemacs. I'll give the basic idea (as
well as I understand it, I'm not an expert by any means) but the
actual code is at
https://github.com/syl20bnr/spacemacs/blob/master/core/core-display-init.el#L28
When spacemacs starts up, it wants to set the fonts as configured by
the user. To do so, it checks that the user-selected font exists using
find-font (there's new code in the develop branch that allows the user
to set a list of fonts, and picks the first on the list that actually
exists on the system). But in daemon mode, find-font doesn't return a
useful value until the display system is initialised, so there's a
macro:
(defmacro spacemacs|do-after-display-system-init (&rest body)
"If the display-system is initialized, run `BODY', otherwise,
add it to a queue of actions to perform after the first graphical frame is
created."
`(let ((init (cond ((boundp 'ns-initialized) 'ns-initialized)
((boundp 'w32-initialized) 'w32-initialized)
((boundp 'x-initialized) 'x-initialized)
(t 't)))) ; fallback to normal loading behavior
(if (symbol-value init)
(progn
,@body)
(push (lambda () ,@body) spacemacs--after-display-system-init-list))))
The actions on spacemacs--after-display-system-init-list are executed
when the first GUI frame is displayed, via advice on
server-create-window-system-frame.
This process works fine on non-Windows systems, I guess because
ns-initialized and x-initialized are false during daemon startup. But
on Windows it fails and from my testing this appears to be because
w32-initialized is true at this point (unlike the other two). As a
result, the font selection code gets run immediately - specifically
*before* the point when find-font will give a correct answer.
To demonstrate, create a .emacs.d/init.el containing
(progn
(message "%S" w32-initialized)
(message "%S" (find-font (font-spec :name "Courier New")))
(message "%S" w32-initialized))
Set HOME to the directory containing .emacs.d and run emacs --daemon.
The result is
t
nil
t
Do the same on Unix (I used Ubuntu) using x-initialized (and a font
that exists on the Unix system in place of Courier New) and you get
nil
nil
nil
Do the same using emacs (no --daemon) and look in the *Messages*
buffer, and you see
t
t
in both cases.
Hopefully, that clarifies a little.
Paul