GNU bug report logs - #13975
24.3; scheme-mode: Treat Greek letter `λ' as `lambda'

Previous Next

To add a comment to this bug, you must first unarchive it, by sending
a message to control AT debbugs.gnu.org, with unarchive 13975 in the body.
You can then email your comments to 13975 AT debbugs.gnu.org in the normal way.

Toggle the display of automated, internal messages from the tracker.

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: simenheg <at> ifi.uio.no (Simen Heggestøyl)
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3; scheme-mode: Treat Greek letter `λ' as `lambda'
Date: Sat, 16 Mar 2013 13:50:53 +0100

It would be convenient if scheme-mode had the same indentation rules and
font face for `lambda' and the Greek letter `λ'.

I.e., we want this:

    (lambda (x)
      (* x x))

and this:

    (λ (x)
      (* x x))

Instead of this:

    (λ (x)
       (* x x))

Popular Schemes has had λ support for some time now:

  * Racket supports λ (since March 2005)
  * Guile supports λ (since February 2011)
  * Geiser has a key binding for inserting λ (since February 2013)

Message #8 received at 13975 <at> debbugs.gnu.org (full text, mbox):

From: Leo Liu <sdl.web <at> gmail.com>
To: simenheg <at> ifi.uio.no (Simen Heggestøyl)
Cc: 13975 <at> debbugs.gnu.org
Subject: Re: bug#13975: 24.3; scheme-mode: Treat Greek letter
	`λ' as `lambda'
Date: Sat, 16 Mar 2013 21:12:04 +0800

On 2013-03-16 20:50 +0800, Simen Heggestøyl wrote:
>     (λ (x)
>       (* x x))

I check drracket and the default indentation is as the above. I think we
should teach emacs to do it too.

diff --git a/lisp/progmodes/scheme.el b/lisp/progmodes/scheme.el
index a7dbc411..9dce5e6b 100644
--- a/lisp/progmodes/scheme.el
+++ b/lisp/progmodes/scheme.el
@@ -410,6 +410,7 @@ (put 'with-mode 'scheme-indent-function 1)
 (put 'make 'scheme-indent-function 1)
 (put 'style 'scheme-indent-function 1)
 (put 'root 'scheme-indent-function 1)
+(put 'λ 'scheme-indent-function 1)
 
 (defvar dsssl-font-lock-keywords
   (eval-when-compile

Message #11 received at 13975 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Leo Liu <sdl.web <at> gmail.com>
Cc: 13975 <at> debbugs.gnu.org,
	Simen Heggestøyl <simenheg <at> ifi.uio.no>
Subject: Re: bug#13975: 24.3; scheme-mode: Treat Greek letter `λ' as `lambda'
Date: Sat, 16 Mar 2013 09:51:00 -0400

> +(put 'λ 'scheme-indent-function 1)
 
Go for it,


        Stefan

Message #14 received at 13975 <at> debbugs.gnu.org (full text, mbox):

From: simenheg <at> ifi.uio.no (Simen Heggestøyl)
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: sdl.web <at> gmail.com, 13975 <at> debbugs.gnu.org
Subject: Re: bug#13975: 24.3; scheme-mode: Treat Greek letter `λ' as `lambda'
Date: Sat, 16 Mar 2013 15:41:59 +0100

Can we do this for syntax highlighting as well?

diff --git a/tmp/scheme.el b/tmp/emacs-24.3/lisp/progmodes/scheme.el
index bfcf44b..a7dbc41 100644
--- a/tmp/scheme.el
+++ b/tmp/emacs-24.3/lisp/progmodes/scheme.el
@@ -310,7 +310,7 @@ See `run-hooks'."
 	"(" (regexp-opt
 	     '("begin" "call-with-current-continuation" "call/cc"
 	       "call-with-input-file" "call-with-output-file" "case" "cond"
-	       "do" "else" "for-each" "if" "lambda" "λ"
+	       "do" "else" "for-each" "if" "lambda"
 	       "let" "let*" "let-syntax" "letrec" "letrec-syntax"
 	       ;; SRFI 11 usage comes up often enough.
 	       "let-values" "let*-values"

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:
>> +(put 'λ 'scheme-indent-function 1)
>  
> Go for it,
>
>
>         Stefan

Message #19 received at 13975-done <at> debbugs.gnu.org (full text, mbox):

From: Leo Liu <sdl.web <at> gmail.com>
To: simenheg <at> ifi.uio.no (Simen Heggestøyl)
Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, 13975-done <at> debbugs.gnu.org
Subject: Re: bug#13975: 24.3; scheme-mode: Treat Greek letter
	`λ' as `lambda'
Date: Sat, 16 Mar 2013 23:28:41 +0800

Fixed in emacs-24.

Leo

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.