Re: How can I discover group name?

[Oleksandr Gavenko <gavenkoa@gmail.com>]

On 2016-09-26, Drew Adams wrote:

>> Within "M-x customize"  I found "Text" group.
>
> I don't see that group, with `emacs -Q'.  Perhaps it comes from
> some library that you are using?
>
> What does `M-x customize-group RET TAB' tell you?
> That's how to discover group names.
>
M-x customize RET

  Emacs group: Customization of the One True Editor.
         State : visible group members are all at standard values.
        See also Manual.

  Editing		    Basic text editing facilities.
  Convenience		    Convenience features for faster editing.
  Files		    Support for editing files.
  **Text**	    Support for editing text files.
  ...

Under "Text" group (if press RET on **Text**):

  Text group: Support for editing text files.
         State : visible group members are all at standard values.

  Show Value Text Mode Hook 
     Hook run after entering Text mode. More

  Subgroups:
  Bib		    Major mode for editing bib files.
  Columns		    Prettify columns.
  Lpr		    Print Emacs buffer on line printer.
  Nroff		    Nroff mode.
  Outlines		    Support for hierarchical outlining.
  Picture		    Editing text-based pictures ("ASCII art").
  ...
  Rst		    Support for reStructuredText documents.
  Table		    Text based table manipulation utilities.
  Tex		    Code related to the TeX formatter.
  Tildify		    Add hard spaces or other text fragments to text buffers.
  View		    Peruse file or buffer without editing.

Within 'M-x customize-group RET TAB' I didn't see either "text" nor "Text".

>> I'd like to add my group to this group. Unfortunately this was failed:
>>   (defgroup xxx nil
>>     "xxx-mode customization."
>>     :group 'text)
>               ^^^^  'Text, not 'text, if "Text" is the group name.
>
>> Searching around gave working piece:
>>   (defgroup xxx nil
>>     "xxx-mode customization."
>>     :group 'wp)
>> 
>> How can I guess "wp" name from customize buffer content?
>
> What is the relation between this and group "Text"?
> What do you see in the Customize buffer?

Screens shown above. After executing:

>>   (defgroup xxx nil
>>     "xxx-mode customization."
>>     :group 'wp)

I see my group under Text group:

  Text group: Support for editing text files.
         State : visible group members are all at standard values.

  Show Value Text Mode Hook 
     Hook run after entering Text mode. More

  Subgroups:
  Bib		    Major mode for editing bib files.
  View		    Peruse file or buffer without editing.
  ...
  Xxx		    xxx-mode customization.

================================================================

My question is why does "Text" group require symbol 'wp' in "(defgroup ...)"
call and how can I guess this symbol during navigation across *Customize*
buffers?

I discover proper name only after:

  $ ack -C 5 '(defgroup'  $EMACS_SRC/lisp

  textmodes/rst.el
  283-

  284-(defgroup rst nil "Support for reStructuredText documents."
  285:  :group 'wp
  286-  :version "23.1"
  287-  :link '(url-link "http://docutils.sourceforge.net/rst.html"))

-- 
http://defun.work/