Re: Sub-libaries in a package and use-package ?

[David Masterson]

Philip Kaludercic <philipk@posteo.net> writes:

> David Masterson <dsmasterson@gmail.com> writes:
>
>> Philip Kaludercic <philipk@posteo.net> writes:
>>
>>> David Masterson <dsmasterson@gmail.com> writes:
>>>
>>>> The 'async' package has 2 extra libraries (dired-async &
>>>> smtpmail-async). I'm trying to figure out how to set these up with
>>>> use-package, The documentation for use-package in chapter 3.1 says:
>>>>
>>>> ----
>>>> But the ‘foo’ package might also contain a library named ‘foo-extra.el’.
>>>> If that library is not loaded automatically, you will need a separate
>>>> ‘use-package’ declaration to make sure that it is.
>>>> ----
>>>>
>>>> It doesn't say anything else about this (CMIIAW), but this suggests to
>>>> me that the following should work:
>>>>
>>>> (use-package async
>>>>   :config (async-bytecomp-package-mode 1)
>>>>   )
>>>> (use-package dired-async
>>>>   :config (dired-async-mode 1)
>>>>   )
>>>> (use-package smtpmail-async
>>>>   :config (setq message-send-mail-function 'aync-smtpmail-send-it)
>>>>   )
>>>>
>>>> But the following error when I start Emacs:
>>>>
>>>> Error (use-package): Failed to install dired-async: Package
>>>>   ‘dired-async-’ is unavailable 
>>>> Error (use-package): Failed to install smtpmail-async: Package
>>>>   ‘smtpmail-async-’ is unavailable 
>>>
>>> Did you set `use-package-always-ensure' to a non-nil value?  It might be
>>> that use-package is trying to install the package
>>> {dired,stmpmail}-async, even though these are just libraries, part of
>>> the async package.
>>
>> Hmm. I do have 'use-package-always-ensure' set to t, but it doesn't look
>> like it's trying to install -- it just can't find the package.  There
>> should be a mechanism to tell use-package that this is a library in some
>> other package, 
>
> It cannot install the packages, because they don't exist.  Perhaps
> adding a :ensure nil could help?

Ah!  This seems to work good:

----
(use-package async
  :delight
  :config (async-bytecomp-package-mode 1)
  )
(use-package dired-async
  :ensure nil
  :config (dired-async-mode 1)
  )
(use-package smtpmail-async
  :ensure nil
  :autoload async-smtpmail-send-it
  :init (setq message-send-mail-function 'async-smtpmail-send-it)
  )
----

>>> Also, I don't think it is necessary to configure all of these
>>> separately, at least in your case.
>>
>> Possibly true.  I can get around this by requiring the sub-libraries in
>> the :config section of async.  But that doesn't quite feel right,,, :(
>
> I'd question why you need to require the libraries in the first place.

The async package seems to have made the decision that, if you want to
do dired/smtpmail asynchronously, then require the sub-libraries.  I
thought I'd try it to see if I have a problem, but, since there are
cases where it might have a problem, I might turn it off again which I
could do with :disabled in the sub-library packages if it worked.

-- 
David Masterson