In fact, it's a fairly simple patch. See attached for my stab at it. (Also,
there's a more straightforward test input file.) I did the two-arg
divert(), since that seems more natural than coming up with a new/separate
builtin for this.
I think this fills a hole in the core m4 feature set---right now, as I
understand it, the only way to send text to a diversion is at the point
when the text is actually being written out. With this, you can send text
to a diversion in the same way that errprint() sends text to stderr:
immediately upon evaluation of the builtin. Without regard to the invoking
context.
--Daniel
--
NAME = Daniel Richard G. ## Remember, skunks _\|/_ meef?
EMAIL1 = [EMAIL PROTECTED] ## don't smell bad--- (/o|o\) /
EMAIL2 = [EMAIL PROTECTED] ## it's the people who < (^),>
WWW = http://www.******.org/ ## annoy them that do! / \
--
(****** = site not yet online)
Index: modules/m4.c
===================================================================
RCS file: /sources/m4/m4/modules/m4.c,v
retrieving revision 1.106
diff -u -r1.106 m4.c
--- modules/m4.c 3 Apr 2007 21:06:16 -0000 1.106
+++ modules/m4.c 21 May 2007 06:18:07 -0000
@@ -70,7 +70,7 @@
BUILTIN (decr, false, true, true, 1, 1 ) \
BUILTIN (define, true, true, false, 1, 2 ) \
BUILTIN (defn, false, true, false, 1, -1 ) \
- BUILTIN (divert, false, false, false, 0, 1 ) \
+ BUILTIN (divert, false, false, false, 0, 2 ) \
BUILTIN (divnum, false, false, false, 0, 0 ) \
BUILTIN (dnl, false, false, false, 0, 0 ) \
BUILTIN (dumpdef, false, false, false, 0, -1 ) \
@@ -587,11 +587,24 @@
M4BUILTIN_HANDLER (divert)
{
int i = 0;
+ int prevdiv;
+ const char *text;
if (argc >= 2 && !m4_numeric_arg (context, argc, argv, 1, &i))
return;
+ prevdiv = m4_get_current_diversion (context);
+
m4_make_diversion (context, i);
+
+ if (argc == 2)
+ return;
+
+ text = M4ARG (2);
+
+ m4_shipout_text (context, NULL, text, strlen (text));
+
+ m4_make_diversion (context, prevdiv);
}
/* Expand to the current diversion number. */
define(`p', `<P>$1</P>')dnl
dnl
Mark 1
foo1 divert(10)<bar1>divert(0) qux1
Mark 2
p(`foo2 divert(10)<bar2>divert(0) qux2')
Mark 3
p(foo3 divert(10)<bar3>divert(0) qux3)
Mark 4
p(foo4 divert(10, <bar4>) qux4)
Mark 5
p(foo5 divert(10, `p(bar5)') qux5)
End of input
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