(setq gnus-select-method '(nnnil))
(defun my-gnus-group-list-subscribed-groups ()
  "List all subscribed groups with or without un-read messages"
  (interactive)
  (gnus-group-list-all-groups 5))

(add-hook 'gnus-group-mode-hook 'gnus-topic-mode)
(define-key gnus-group-mode-map
  ;; list all the subscribed groups even they contain zero un-read messages
  (kbd "o") 'my-gnus-group-list-subscribed-groups)

(setq gnus-secondary-select-methods
      '((nnmaildir "personal"
                   (nnmail-expiry-target "nnmaildir+personal:Trash")
                   (directory "~/mail-home"))
        (nnmaildir "work"
                   (nnmail-expiry-target "nnmaildir+work:[Gmail]+Bin")
                   (directory "~/mail-work"))))

(setq gnus-ignored-newsgroups "^to\\.\\|^[0-9. ]+\\( \\|$\\)\\|^[\"]\"[#'()]"
      nnmail-expiry-wait 'immediate
      message-sendmail-f-is-evil 't
      message-sendmail-extra-arguments '("--read-envelope-from")
      message-send-mail-function 'message-send-mail-with-sendmail
      sendmail-program "msmtp"
      mail-host-address "mccd.space"
      user-full-name "Marc Coquand"
      user-mail-address "marc@mccd.space")

(setq gnus-topic-topology '(("Gnus" visible)
                            (("personal" visible))
                            (("misc" hidden))
                            (("work" visible nil nil))
                            ))
(setq gnus-topic-alist '(("personal" ; the key of topic
                          "nnmaildir+personal:INBOX"
                          "nnmaildir+personal:INBOX+Forums"
                          "nnmaildir+personal:Archive"
                          "nnmaildir+personal:Archive+Support"
                          )
                         ("misc"
                          "nnfolder+archive:sent.2024-04"
                          "nnmaildir+personal:Archive+Receipt"
                          "nnmaildir+personal:Archive+WCIG"
                          "nnmaildir+personal:Spam"
                          "nnmaildir+personal:Sent"
                          )
                         ("work" ; the key of topic
                          "nnmaildir+work:INBOX"
                          "nnmaildir+work:[Gmail]+Sent Mail"
                          "nnmaildir+work:[Gmail]+Trash"
                          )
                         ("Gnus")))


(setq gnus-ignored-newsgroups "^to\\.\\|^[0-9. ]+\\( \\|$\\)\\|^[\"]\"[#'()]")
(setq nnheader-file-name-translation-alist '((?[ . ?_) (?] . ?_)) )
(setq gnus-summary-thread-gathering-function 'gnus-gather-threads-by-subject)
(setq gnus-thread-hide-subtree t)
(setq gnus-thread-ignore-subject t)