PATCH: random attribute stuff

[Peter Stephenson <pws@csr.com>]

This is supposed to replace ad hoc code that fixes up text attributes
after the right prompt to use the usual settextattributes() function.
However, having seen the change, it's more ad hoc than I hoped... still,
that's mostly because it now handles changes in colour which it didn't
before.

I'm not completely convinced of the utility of this chunk of code.  It
seems to be designed so that after a right prompt is output everything
is the same as after the normal prompt.  But both before and after this
patch if I let the right prompt leave, say, underline turned on then
when I play with history lines the main line appears underlined, too.  I
don't think it's ever been a good idea to leave effects turned on after
prompts.

Index: Src/zsh.h
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/zsh.h,v
retrieving revision 1.129
diff -u -r1.129 zsh.h
--- Src/zsh.h	2 May 2008 22:48:58 -0000	1.129
+++ Src/zsh.h	6 May 2008 09:06:02 -0000
@@ -1983,6 +1983,8 @@
 #define TXT_ATTR_OFF_ON_SHIFT 6
 #define TXT_ATTR_OFF_FROM_ON(attr)	\
     (((attr) & TXT_ATTR_ON_MASK) << TXT_ATTR_OFF_ON_SHIFT)
+#define TXT_ATTR_ON_FROM_OFF(attr)	\
+    (((attr) & TXT_ATTR_OFF_MASK) >> TXT_ATTR_OFF_ON_SHIFT)
 /*
  * Indicates to zle_refresh.c that the character entry is an
  * index into the list of multiword symbols.
Index: Src/Zle/zle_refresh.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/Zle/zle_refresh.c,v
retrieving revision 1.65
diff -u -r1.65 zle_refresh.c
--- Src/Zle/zle_refresh.c	1 May 2008 10:58:25 -0000	1.65
+++ Src/Zle/zle_refresh.c	6 May 2008 09:06:03 -0000
@@ -1869,29 +1869,44 @@
 
     /* output the right-prompt if appropriate */
 	if (put_rpmpt && !iln && !oput_rpmpt) {
+	    int attrchange;
+
 	    moveto(0, winw - 1 - rpromptw);
 	    zputs(rpromptbuf, shout);
 	    vcs = winw - 1;
 	/* reset character attributes to that set by the main prompt */
 	    txtchange = pmpt_attr;
-	    if (txtchangeisset(txtchange, TXTNOBOLDFACE) &&
-		(rpmpt_attr & TXTBOLDFACE))
-		tsetcap(TCALLATTRSOFF, 0);
-	    if (txtchangeisset(txtchange, TXTNOSTANDOUT) &&
-		(rpmpt_attr & TXTSTANDOUT))
-		tsetcap(TCSTANDOUTEND, 0);
-	    if (txtchangeisset(txtchange, TXTNOUNDERLINE) &&
-		(rpmpt_attr & TXTUNDERLINE))
-		tsetcap(TCUNDERLINEEND, 0);
-	    if (txtchangeisset(txtchange, TXTBOLDFACE) &&
-		(rpmpt_attr & TXTNOBOLDFACE))
-		tsetcap(TCBOLDFACEBEG, 0);
-	    if (txtchangeisset(txtchange, TXTSTANDOUT) &&
-		(rpmpt_attr & TXTNOSTANDOUT))
-		tsetcap(TCSTANDOUTBEG, 0);
-	    if (txtchangeisset(txtchange, TXTUNDERLINE) &&
-		(rpmpt_attr & TXTNOUNDERLINE))
-		tsetcap(TCUNDERLINEBEG, 0);
+	    /*
+	     * Keep attributes that have actually changed,
+	     * which are ones off in rpmpt_attr and on in
+	     * pmpt_attr, and vice versa.
+	     */
+	    attrchange = txtchange &
+		(TXT_ATTR_OFF_FROM_ON(rpmpt_attr) |
+		 TXT_ATTR_ON_FROM_OFF(rpmpt_attr));
+	    /*
+	     * Careful in case the colour changed.
+	     */
+	    if (txtchangeisset(txtchange, TXTFGCOLOUR) &&
+		(!txtchangeisset(rpmpt_attr, TXTFGCOLOUR) ||
+		 ((txtchange ^ rpmpt_attr) & TXT_ATTR_FG_COL_MASK)))
+	    {
+		attrchange |=
+		    txtchange & (TXTFGCOLOUR | TXT_ATTR_FG_COL_MASK);
+	    }
+	    if (txtchangeisset(txtchange, TXTBGCOLOUR) &&
+		(!txtchangeisset(rpmpt_attr, TXTBGCOLOUR) ||
+		 ((txtchange ^ rpmpt_attr) & TXT_ATTR_BG_COL_MASK)))
+	    {
+		attrchange |=
+		    txtchange & (TXTBGCOLOUR | TXT_ATTR_BG_COL_MASK);
+	    }
+	    /*
+	     * Now feed these changes into the usual function,
+	     * if necessary.
+	     */
+	    if (attrchange)
+		settextattributes(attrchange);
 	}
     }
 


-- 
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