cus-edit package is not found

[akirak]

unpackaged/custom-set-at-point function depends on cus-edit package, which is not found in any of org-elpa, melpa, gnu-elpa-mirror, and emacsmirror. I don't know what this package is supposed to do, but it doesn't look like a good idea to load dependencies in unpackaged.el through use-package, because it can cause load errors. Unlike typical packages, I only need part of unpackaged.el and not all the stuffs, so I need a way to skip the dependencies.

[alphapapa]

Hi Akira,

I don't understand. cus-edit is part of Emacs, it's in cus-edit.el in the lisp directory of the Emacs source. It's part of the customization system. It has (provide 'cus-edit) at the end of the file, so it should work in a use-package form, and it's full of autoloads, so it should probably be loaded in your Emacs session already.

[yunhao94]

I meet the same problem, because there's (setq use-package-always-ensure t) in my init file, and (use-package cus-edit :ensure nil) may solve the problem.

[alphapapa]

@yunhao94 This seems strange to me. For example, this issue seems to indicate that use-package is intended to work properly with built-in packages (technically, "features" rather than "packages"), even if :ensure is used: jwiegley/use-package#491

@akirak @yunhao94 What exactiy is the problem you're having? Are you getting an error message?

If use-package is trying to install an already-installed, built-in feature, that seems like a bug in use-package which ought to be reported.

[yunhao94]

I attempt to use GNU Emacs 26.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.8) of 2019-04-13 with a minimal init file like this:

;;; -*- lexical-binding: t -*-

(setq debug-on-error t)

(require 'package)
(setq package-archives '(("gnu" . "http://mirrors.tuna.tsinghua.edu.cn/elpa/gnu/")
                         ("melpa" . "http://mirrors.tuna.tsinghua.edu.cn/elpa/melpa/")))
(package-initialize)

(unless (package-installed-p 'use-package)
  (package-refresh-contents)
  (package-install 'use-package))

(eval-when-compile
  (require 'use-package))

(use-package cus-edit
  :ensure t)

and get the following error message:

Debugger entered--Lisp error: (error "Package ‘cus-edit-’ is unavailable")
  signal(error ("Package ‘cus-edit-’ is unavailable"))
  error("Package `%s-%s' is unavailable" cus-edit "")
  package-compute-transaction(nil ((cus-edit)))
  package-install(cus-edit)
  use-package-ensure-elpa(cus-edit (t) nil)
  eval-buffer(#<buffer  *load*> nil "/home/user/.emacs.d/init.el" nil t)  ; Reading at buffer position 458
  load-with-code-conversion("/home/user/.emacs.d/init.el" "/home/user/.emacs.d/init.el" t t)
  load("/home/user/.emacs.d/init" t t)
  #f(compiled-function () #<bytecode 0x1df989>)()
  command-line()
  normal-top-level()

[akirak]

I am using straight.el to fetch packages and get the following error on Emacs 26.2 (built with Nix):

(error "Could not find package cus-edit in recipe repositories: (org-elpa melpa gnu-elpa-mirror emacsmirror)")
  signal(error ("Could not find package cus-edit in recipe repositories: (org-elpa melpa gnu-elpa-mirror emacsmirror)"))
  error("Could not find package %S in recipe repositories: %S" cus-edit (org-elpa melpa gnu-elpa-mirror emacsmirror))
  straight--convert-recipe(cus-edit nil)
  straight-use-package(cus-edit)

[akirak]

I found a solution to prevent the error with straight.el. I had to override the recipe for the built-in package:

(straight-use-package '(cus-edit :type built-in))

[alphapapa]

I'm getting a bit confused now. @yunhao94's ECM doesn't involve straight, but @akirak just said that he's using straight. Is it part of the problem or unrelated?

Again:

If use-package is trying to install an already-installed, built-in feature, that seems like a bug in use-package which ought to be reported.

Please consider reporting a bug to the use-package tracker.

[alphapapa]

Specifically, it seems to me that this function ought to check whether a feature is already present using featurep. For example, (featurep 'cus-edit) returns t. If it checked for that, it would know not to try to install it as a package.

https://github.com/jwiegley/use-package/blob/1d5ffb2e0d1427066ced58febbba68c1328bf001/use-package-ensure.el#L155

[alphapapa]

Ping, anyone?

[akirak]

I don't use the command, but both unpackaged.el and cus-edit successfully load now. I think this issue should be closed.

[alphapapa]

Thanks.