Re: Covering of prog-mode

[Jean Louis <bugs@gnu.support>]

* Heime <heimeborgia@protonmail.com> [2024-12-03 23:28]:
> If I do so for c-mode, how can I find out if it is included in prog-mode?

I understand.

But on my side I cannot find `c-mode':

Debugger entered--Lisp error: (file-error "Can't find library" "c-mode")
  find-library-name("c-mode")
  find-library("c-mode")
  funcall-interactively(find-library "c-mode")
  command-execute(find-library record)
  execute-extended-command(nil "find-library" nil)
  funcall-interactively(execute-extended-command nil "find-library" nil)
  command-execute(execute-extended-command)

It is function, and I find it is function by doing:

C-h f c-mode RET

then I see:

c-mode is an autoloaded interactive native-comp-function in
‘cc-mode.el’.

(c-mode)

Major mode for editing C code.

then in that window I see hyperlinked file cc-mode.el so I press
there, then I move to top of the file, and I find:

;; This package provides GNU Emacs major modes for editing C, C++,
;; Objective-C, Java, CORBA's IDL, Pike and AWK code.  As of the
;; latest Emacs and XEmacs releases, it is the default package for
;; editing these languages.  This package is called "CC Mode", and
;; should be spelled exactly this way.

and then I put attention on your question to find if it is dependent
maybe on `prog-mode', so I use `C-s prog-mode' and indeed I am finding
occurences.

When we are by occurences, M-x occur RET prog-mode RET gives me more
summarized information:

11 matches in 10 lines for "prog-mode" in buffer: cc-mode.el
    339:  (when (boundp 'prog-mode-map)
    340:    (c-set-keymap-parent c-mode-base-map prog-mode-map))
   2829:(unless (fboundp 'prog-mode) (defalias 'prog-mode 'fundamental-mode))
   2832:(define-derived-mode c-mode prog-mode "C"
   2928:(define-derived-mode c++-mode prog-mode "C++"
   2976:(define-derived-mode objc-mode prog-mode "ObjC"
   3029:(define-derived-mode java-mode prog-mode "Java"
   3073:(define-derived-mode idl-mode prog-mode "IDL"
   3118:(define-derived-mode pike-mode prog-mode "Pike"
   3176:(define-derived-mode awk-mode prog-mode "AWK"

so yes, the cc-mode.el and c-mode command are all somehow derived from
prog-mode, you see?

-- 
Jean Louis