Add a `color' request and a `.color' register to control usage of

colours.

* src/roff/troff/input.cc (disable_color_flag): Replaced with...
(color_flag): This (which is the inverse).
(activate_color): New function.
(main, init_input_requests): Updated.
* src/roff/troff/troff.h, src/roff/troff/node.cc
(troff_output_file::fill_color, troff_output_file::glyph_color):
Updated.

* NEWS, doc/groff.texinfo, man/groff_diff.man, man/groff.man:
Document the changes.


Circumvent bug in autoconf 2.53 regarding top_builddir.

* aclocal.m4 (GROFF_BUILDDIR): s/top_builddir/groff_top_builddir/.
* Makefile.in, src/xditview/Imakefile.in, doc/Makefile.in:
s/@top_builddir@/@groff_top_builddir@/.
* configure: Regenerated (with autoconf 2.53).

2 files changed, 24 insertions, 2 deletions

diff --git a/man/groff.man b/man/groff.man
index 95ed8bd8..b360dc5e 100644
--- a/man/groff.man
+++ b/man/groff.man
@@ -2,7 +2,7 @@
 .ig
 groff.man
 
-Last update: 27 May 2002
+Last update: 18 June 2002
 
 This file is part of groff, the GNU roff type-setting system.
 
@@ -1317,6 +1317,14 @@ Chop the last character off macro, string, or diversion
 Close the
 .IR stream .
 .
+.REQ .color
+Enable colors.
+.
+.REQ .color N
+If
+.I N
+is zero disable colors, otherwise enable them.
+.
 .REQ .continue
 Finish the current iteration of a while loop.
 .
@@ -2967,6 +2975,9 @@ request.
 The height of the last character added to the current environment.
 It is positive if the character extends above the baseline.
 .
+.REG .color
+1\~if colors are enabled, 0\~otherwise.
+.
 .REG .csk
 The skew of the last character added to the current environment.
 The skew of a character is how far to the right of the center of a character
diff --git a/man/groff_diff.man b/man/groff_diff.man
index 07a8d951..05ff6d2b 100644
--- a/man/groff_diff.man
+++ b/man/groff_diff.man
@@ -3,7 +3,7 @@
 .ig
 groff_diff.man
 
-Last update : 27 May 2002
+Last update : 18 June 2002
 
 This file is part of groff, the GNU roff type-setting system.
 It is the source of the man-page groff_diff(7).
@@ -1134,6 +1134,13 @@ and
 requests.
 .
 .TP
+.BI .color\  n
+If
+.I n
+is non-zero or missing, enable colors (this is the default), otherwise
+disable them.
+.
+.TP
 .BI .cp\  n
 If
 .I n
@@ -2463,6 +2470,10 @@ The height of the last character added to the current environment.
 It is positive if the character extends above the baseline.
 .
 .TP
+.B \[rs]n[.color]
+1\~if colors are enabled, 0\~otherwise.
+.
+.TP
 .B \[rs]n[.csk]
 The skew of the last character added to the current environment.
 .