Port package configuration to use-package

Also update package list:

- account eglot and use-package being built-in
- add a couple of packages for Emacs development (elisp-benchmarks,
  gnus-mock)
- remove paradox (most features now built into vanilla package.el)

2 files changed, 32 insertions, 13 deletions

diff --git a/.emacs b/.emacs
index 0841f43..1604dd5 100644
--- a/.emacs
+++ b/.emacs
@@ -24,8 +24,14 @@
 ;; to the default list, unless I cautiously audit every release.
 ;;
 ;; Examples: erc-modules, git-commit-setup-hook, package-archives.
-(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/") t)
+(defun my/list-update (l to-add &optional to-remove)
+  (declare (indent 1))
+  (thread-first
+    l (seq-union to-add) (seq-difference to-remove)))
 
+(if (fboundp 'setopt)
+    (defalias 'my/setopt 'setopt)
+  (defalias 'my/setopt 'customize-set-variable))
 
 ;;; Key bindings.
 
@@ -630,14 +636,6 @@
 
 ;; Trying out use-package.
 
-(defun my/list-update (l to-add to-remove)
-  (thread-first
-    l (seq-union to-add) (seq-difference to-remove)))
-
-(if (fboundp 'setopt)
-    (defalias 'my/setopt 'setopt)
-  (defalias 'my/setopt 'customize-set-variable))
-
 (use-package emacs
   :when (>= emacs-major-version 28)
   :init
@@ -658,6 +656,29 @@
   :config
   (load-theme 'modus-vivendi))
 
+(use-package package
+  :custom
+  (package-selected-packages
+   (append '(auctex
+             debbugs
+             delight
+             diff-hl
+             elisp-benchmarks
+             gnus-mock
+             magit
+             markdown-mode
+             page-break-lines
+             rg
+             rust-mode
+             which-key
+             wgrep)
+           (when (<= emacs-major-version 29)
+             '(eglot use-package))))
+  :config
+  (my/setopt package-archives
+             (my/list-update package-archives
+               '(("melpa" . "https://melpa.org/packages/")))))
+
 (use-package ediff
   :custom
   (ediff-merge-split-window-function 'split-window-vertically)
@@ -683,8 +704,8 @@
   (erc-use-auth-source-for-nickserv-password t)
   (erc-user-full-name 'user-full-name)
   :config
-  (my/setopt erc-modules (my/list-update
-                          erc-modules '(log notifications) '(fill))))
+  (my/setopt erc-modules (my/list-update erc-modules
+                           '(log notifications) '(fill))))
 
 (use-package icomplete
   :config
diff --git a/.emacs-custom.el b/.emacs-custom.el
index 73cfcaa..de57927 100644
--- a/.emacs-custom.el
+++ b/.emacs-custom.el
@@ -41,8 +41,6 @@
  '(lua-indent-level 2)
  '(menu-bar-mode nil)
  '(minibuffer-depth-indicate-mode t)
- '(package-selected-packages
-   '(async auctex debbugs delight diff-hl eglot flycheck magit markdown-mode page-break-lines paradox rg rust-mode use-package which-key wgrep))
  '(page-break-lines-modes '(fundamental-mode text-mode prog-mode special-mode))
  '(paradox-execute-asynchronously t)
  '(paradox-github-token t)