Registering new pseudo-headers and displaying them in pull-down menu

[comburent]

How can I expand the list of recognized git commit pseudo-headers and have them show up in the pull-down menu as well?

Magit version: Magit 3.3.0-6.7a1d503, Transient 0.4.3, Git 2.41.0, Emacs 29.1, gnu/linux

[tarsius]

Copy the command for another such header command and make the necessary adjustments. Then bind it in git-commit-mode-menu. https://www.gnu.org/software/emacs/manual/html_node/elisp/Menu-Example.html and related sections should help with the latter.

[tarsius]

is there a chance to make that procedure more flexible?

There's a new git-commit--insert-trailer, which does that. As you can see I changed the terminology from "pseudo header" to "trailer", like Git does.

For proper fontification you have to add an entry to git-commit-trailers. You might want to use C-c C-i to insert trailers, and add your inserter to that.

(defun git-commit-copyright-paperwork-exempt ()
  "Insert \"Copyright-paperwork-exempt: Yes\" in the commit message.
This is mostly relevant for the glibc project.
See: <https://sourceware.org/glibc/wiki/Contribution%20checklist#Attribution>"
  (interactive nil git-commit-major-mode)
  (git-commit--insert-trailer "Copyright-paperwork-exempt" "Yes"))

;; Enable highlighting and placing other trailers next to it.
(cl-pushnew "Copyright-paperwork-exempt" git-commit-trailers :test #'equal)

;; Add to "C-c C-i" menu.
(transient-append-suffix 'git-commit-insert-trailer '(0 -1)
  ["Insert"
   ("x" "Copyright-Exempt" git-commit-copyright-paperwork-exempt)])

[comburent]

How can I register new arguments for commit to use in the interactive menu? (e.g. --date or something entirely custom like --date=now)

P.S.: I know there's the -R switch but I'm interested in resetting or changing the date only.

[tarsius]

See https://magit.vc/manual/transient/Modifying-Existing-Transients.html.