Fix eldoc don't show function signature in some situations
Table of Contents
Current issue
The default option eldoc-message-commands covers the normal use case(already
including self-insert-command. But it is not add c-electric-* by default, which
means you will not get function signatures in cc-mode buffers after you insert
an open bracket. Besides, when using eldoc along with completion frameworks like
corfu, eldoc will not show up if it is displayed in echo erea.
Solutions
Use eldoc-add-command and eldoc-add-command-completions, but don't modify
eldoc-message-commands directly.
(with-eval-after-load 'eldoc
(eldoc-add-command-completions "c-electric-")
(dolist (command '(corfu-insert corfu-quit))
(eldoc-add-command command)))
There is another option eldoc-print-after-edit. But after it is set to t, eldoc
will only be shown when editing.