Re: DEBUG_CMD_LINE (Was Re: PATCH: skip command from debug trap)

[Peter Stephenson <pws@csr.com>]

On Thu, 7 Aug 2008 11:40:30 +0100
Stephane Chazelas <Stephane_Chazelas@yahoo.fr> wrote:
> On Thu, Aug 07, 2008 at 11:14:38AM +0100, Peter Stephenson wrote:
> [...]
> > > BTW, shouldn't PROMPT_SUBST be enabled by default in sh and ksh
> > > emulation?
> > 
> > If they do that, then presumably yes.
> [...]
> 
> It's required by SUSv3 for non-priviledged users for systems
> supporting the User Portability Utilities option (so include the
> sh of Unix conformant systems, but not necessarily POSIX
> conformant ones I suppose).

Looks like it's already set up for ksh.  It should probably be turned on
for other Bourne-style shells.  I suppose it wasn't done originally because
at the time that meant old-fashioned, fairly limited Bourne shells, but
nowadays it doesn't.  "promptvars" is on by default in bash.

Index: Doc/Zsh/options.yo
===================================================================
RCS file: /cvsroot/zsh/zsh/Doc/Zsh/options.yo,v
retrieving revision 1.61
diff -u -r1.61 options.yo
--- Doc/Zsh/options.yo	12 Jun 2008 13:45:05 -0000	1.61
+++ Doc/Zsh/options.yo	7 Aug 2008 12:04:46 -0000
@@ -1009,7 +1009,7 @@
 )
 pindex(PROMPT_SUBST)
 cindex(prompt, parameter expansion)
-item(tt(PROMPT_SUBST) <K>)(
+item(tt(PROMPT_SUBST) <K> <S>)(
 If set, em(parameter expansion), em(command substitution) and
 em(arithmetic expansion) are performed in prompts.  Substitutions
 within prompts do not affect the command status.
Index: Src/options.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/options.c,v
retrieving revision 1.43
diff -u -r1.43 options.c
--- Src/options.c	31 Jul 2008 08:44:21 -0000	1.43
+++ Src/options.c	7 Aug 2008 12:04:47 -0000
@@ -198,7 +198,7 @@
 {{NULL, "promptcr",	      OPT_ALL},			 PROMPTCR},
 {{NULL, "promptpercent",      OPT_NONBOURNE},		 PROMPTPERCENT},
 {{NULL, "promptsp",	      OPT_ALL},			 PROMPTSP},
-{{NULL, "promptsubst",	      OPT_KSH},			 PROMPTSUBST},
+{{NULL, "promptsubst",	      OPT_BOURNE},		 PROMPTSUBST},
 {{NULL, "pushdignoredups",    OPT_EMULATE},		 PUSHDIGNOREDUPS},
 {{NULL, "pushdminus",	      OPT_EMULATE},		 PUSHDMINUS},
 {{NULL, "pushdsilent",	      0},			 PUSHDSILENT},

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR PLC, Churchill House, Cambridge Business Park, Cowley Road
Cambridge, CB4 0WZ, UK                          Tel: +44 (0)1223 692070