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Re: Howto modify syntax entry for "[" and "]" in elisp mode?

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gjlayde <georgjohann@web.de> writes:

> I am using emacs-lisp mode to edit RTL (Register Transfer Language)
> files.  I chose elistp because that's close to RTL.
>
> Indentation works fine, except when I have to break very long
> lines. Suppose the following example:
>
>   [(set (pc)
>         (if_then_else
>          (match_operator 0 "ordered_comparison_operator"
>                          [(match_operand:PSI 1 "register_operand" "r,r,d ,r  ,d,r")
>                           (match_operand:PSI 2 "nonmemory_operand" "L,r,s ,s  ,M,n")])
>          (label_ref (match_operand 3 "" ""))
>          (pc)))
>    (clobber (match_scratch:QI 4 "=X,X,&d,&d ,X,&d"))]
>
> What I want is that "[" and "]" basically behave like "(" and ")".

In my emacs-lisp-mode, [ and ] already behave like ( and ) because []s
are used for vectors and must nest correctly with ()s.

> In particular, it appears that indentation of the line starting with
> "[" is far too much and aligns with the next space in the line above.

( does this as well as [.  The arguments in a form are lined up with
each other:

(a b
   c
   (d e))
[a b
   c
   [d e]]

Otherwise one space indent is used:

(a
 b
 c
 (d
  e))
[a
 b
 c
 [d
  e]]

(I am ignoring the special case of (def... forms that indent the second
line by an amount you can set).

> So "[" whould indent a fixed amout compared to the line above it.

You could maybe write a indent function which you then use by setting
the variable 'lisp-indent-function' but I can imagine that gets a bit
fussy.

-- 
Ben.

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Thread

Howto modify syntax entry for "[" and "]" in elisp mode? gjlayde <georgjohann@web.de> - 2023-05-04 10:17 -0700
  Re: Howto modify syntax entry for "[" and "]" in elisp mode? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-05-04 20:48 +0100
    Re: Howto modify syntax entry for "[" and "]" in elisp mode? gjlayde <georgjohann@web.de> - 2023-05-04 13:12 -0700
      Re: Howto modify syntax entry for "[" and "]" in elisp mode? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-05-05 00:44 +0100
  Re: Howto modify syntax entry for "[" and "]" in elisp mode? steve g <Sgonedes1977@gmail.com> - 2026-06-24 23:29 -0400

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