Re: Bang completion kills zsh in emacs process buffer

[Peter Stephenson <pws@csr.com>]

"Dwight Shih" wrote:
> Peter,
> 
> zsh thinks that it's an interactive shell because emacs invokes it with
> the -i option.

OK, I think I see what's going on now.

!-history is in use because:
 - the shell is interactive, and
 - shell input is standard input

shout gets set if:
  - the shell is interactive, and
  - SHTTY is set

SHTTY is set if and only we are talking to a tty on fd 0, and we aren't.
We can't very well set it or shout in that case.  (We could in principle
look harder for a tty, but that's not the issue here --- there just
isn't one.)

In that case, I think the right thing to do might be the following.
Presumably this bug has been there forever.

Comments?

Index: Src/hist.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/hist.c,v
retrieving revision 1.46
diff -u -r1.46 hist.c
--- Src/hist.c	11 Aug 2003 13:19:55 -0000	1.46
+++ Src/hist.c	19 Sep 2003 17:17:09 -0000
@@ -1091,9 +1091,16 @@
 
 	ptr = ztrdup(chline);
 	if ((flag & (HISTFLAG_DONE | HISTFLAG_RECALL)) == HISTFLAG_DONE) {
-	    zputs(ptr, shout);
-	    fputc('\n', shout);
-	    fflush(shout);
+	    /*
+	     * If fd 0 isn't a tty, we may not have a shout, even
+	     * though the shell is interactive.  Observed with
+	     * Emacs shell mode, which makes the shell interactive
+	     * explicitly.
+	     */
+	    FILE *fout = shout ? shout : stdout;
+	    zputs(ptr, fout);
+	    fputc('\n', fout);
+	    fflush(fout);
 	}
 	if (flag & HISTFLAG_RECALL) {
 	    zpushnode(bufstack, ptr);

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 692070


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