Implement continuous underlining for nroff mode. To do that, a new

request in the ditroff language has been added: `x u N' (N is 0
or 1).

X and Y are now transparent to end-of-sentence recognition.

* src/include/printer.h (printer): Add `type' parameter to `special'
method.
* src/libs/libdriver/printer.cc (printer::special): Updated.
* src/libs/libdriver/input.cc (do_file): Handle `x u N'.

* src/devices/dvi/dvi.cc (dvi_printer::special): Handle only
specials of type `p'.
* src/devices/grohtml/post-html.cc (html_printer::special): Ditto.
* src/devices/grohtml-old/html.cc (html_printer::special): Ditto.
* src/devices/grops/ps.cc (ps_printer::special): Ditto.
* src/devices/grotty/tty.cc: Add new enum CU_MODE.
(glyph::order): New method.
(tty_printer::add_char): Use it.
(tty_printer::special): New method.
(tty_printer::end_page): Implement it.

* src/roff/troff/node.h (special_node): Add `no_init_string' member.
* src/roff/troff/node.cc (special_node::special_node): Add parameter
to set `no_init_string'.
(special_node::tprint_start): Use it.
(special_node::same, special_node::copy): Updated.
(special_node::ends_sentence): New method.
(troff_output_file::start_special): Add parameter to include
inititialization of special conditionally.

* src/roff/troff/env.h (environment): New member `underline_spaces'.
* src/roff/troff/env.cc (do_underline_special): New function.
(environment::set_font): Use it.
(do_underline): Use it.  This was `underline()'.
(underline): Call `do_underline()'.
(continuous_underline): New function which calls `do_underline()'.
(environment::newline): Use `do_underline_special()'.
(init_env_requests): Updated.

* NEWS, man/troff_out.man: Updated.


* font/devutf8/R.proto: Fix code of 'shc'.

1 files changed, 16 insertions, 1 deletions

diff --git a/man/groff_out.man b/man/groff_out.man
index 5e4c9068..ae30f8d4 100644
--- a/man/groff_out.man
+++ b/man/groff_out.man
@@ -1,7 +1,7 @@
 '\" e
 .\" The above line should force the use of eqn as a preprocessor
 .ig
-Copyright (C) 1989-2000 Free Software Foundation, Inc.
+Copyright (C) 1989-2000, 2001 Free Software Foundation, Inc.
 
 Permission is granted to make and distribute verbatim copies of
 this manual provided the copyright notice and this permission notice
@@ -87,6 +87,21 @@ Unlike device-independent troff, it is not necessary
 for drivers to search special fonts to find a character.
 .LP
 The
+.B x
+device control command has been extended.
+.TP
+\fBx u \fIn\fR
+If
+.I n
+is\~1, start underlining of spaces.
+If
+.I n
+is\~0, stop underlining of spaces.
+This is needed for the
+.B cu
+request in nroff mode and is ignored otherwise.
+.LP
+The
 .B D
 drawing command has been extended.
 These extensions will not be used by GNU pic if the