Implement new number register `.br' which is set to 1 if a macro has

been called as .foo and to 0 if called as 'bar.  This is useful for
-mtrace so that requests can be reliably traced too.

* src/roff/troff/input.cpp (input_iterator): Add virtual function
`get_break_flag'.
(macro_iterator): Add `with_break' member and `get_break_flag'
function.
Update constructors.
(input_stack): Add function `get_break_flag'.
(break_flag_reg): New number register class.
(input_init_requests): Register `.br'.

* src/roff/troff/TODO: Updated.

* tmac/trace.tmac: s/!!sp/!!!sp/.
Modify definitions of `de', `de1', `am', and `am1' to use \n[.br].

* docs/groff.texinfo, man/groff.man, man/groff_diff.man, NEWS:
Document it.

1 files changed, 26 insertions, 1 deletions

diff --git a/man/groff_diff.man b/man/groff_diff.man
index e160a860..a33710fe 100644
--- a/man/groff_diff.man
+++ b/man/groff_diff.man
@@ -3,7 +3,7 @@
 .ig
 groff_diff.man
 
-Last update : 27 Mar 2006
+Last update : 04 Apr 2006
 
 This file is part of groff, the GNU roff type-setting system.
 It is the source of the man-page groff_diff(7).
@@ -2607,6 +2607,31 @@ sets tabs every half an inch.
 The following read-only registers are available:
 .
 .TP
+.B \[rs]n[.br]
+Within a macro call, it is set to\~1 if the macro is called with the
+`normal' control character (`.' by default), and set to\~0 otherwise.
+This allows to reliably modify requests.
+.
+.RS
+.IP
+.ne 6v+\n(.Vu
+.ft CB
+.nf
+.Text .als bp*orig bp
+.Text .de bp
+.Text .tm before bp
+.Text .ie \[rs]\[rs]n[.br] .bp*orig
+.Text .el 'bp*orig
+.Text .tm after bp
+.Text ..
+.fi
+.RE
+.
+.IP
+Using this register outside of a macro makes no sense (it always returns
+zero in such cases).
+.
+.TP
 .B \[rs]n[.C]
 1\~if compatibility mode is in effect, 0\~otherwise.
 .