Nested codes with long identifiers

Help!
1

Writing predicates with long identifiers, I often prefer (A) to (B) for readablity. However, with default behavior of Emacs in prolog-mode for <Return> key, codes on the buffer looks like (B). Is there any simple setting for (A). Or do I need to write an emacs-lisp function for (A) ?

(A)

pred :- call_with_time_limit(setup-call_cleanup(
		longlonglonglong_arg_A,
		longlonglonglong_arg_B,
		longlonglonglong_arg_C)).

(B)

pred :- call_with_time_limit(
							 setup-call_cleanup(
												longlonglonglongargA,
												longlonglonglongargB,
												longlonglonglongargC)).

Kuniaki Mukai

2

As is, PceEmacs can only do

longid(a,b,c)
longid(a,
       b,
       c)
longid(
    a,
    b,
    c)

The only option to this is that you can set the indentation in the last version (default 4). I don’t think I’ve ever seen your (B). It is probably not that hard to add, but it would conflict with the 3rd option above. I think it is up to you :slight_smile: If I recall well the source is in xpce/prolog/lib/emacs/language_mode.pl, probably called something like ->indent_line.

3

The recommended emacs prolog.el has customization prolog-left-indent-regexp … maybe you can modify this?

4

I loads into Emacs.app many lisp packages without reading documents. Now I suspect there is conflict between lisp-mode and prolog-mode. (B) seems a lisp way. I should check it. Anyway also I like PceEmacs way. Thanks.

Kuniaki Mukai

5

In stead of reading doc, I have defined a shortcut to insert “\n\t” or “\n” into the emacs buffer depending on whether prolog-mode or not. It is informal, I know, but informal is normal with my use of Emacs.

(global-set-key (kbd "<C-return>")
				'(lambda () (interactive)
				   (if (string-equal major-mode "prolog-mode")
					   (insert  "\n\t")
					   (insert "\n"))))

I use ediprolog.el for a long time without any modification. I am not sure whether it
allows customizing auto indentatio. I will check it. Thank you.

K. Mukai