Adding options -C (compatibility mode) and -c (grotty's old output

scheme) to nroff.

* src/roff/nroff/nroff.sh: Implement it.
Remove `-Wall'.
* NEWS, src/roff/nroff/nroff.man: Updated.

Implementing color support in grotty.  The new switch -c activates
the old drawing scheme, disabling color at the same time.  The new
switch `-i' selects italic instead of underlining (SGR only).

* src/devices/grotty/tty.cc (putstring): New define instead of
`fputs'.  Updated all callers.
(old_drawing_scheme): New global variable.
(COLOR_CHANGE): New enum value.
(SGR_*): New defines containing color handling escape sequences.
(TTY_MAX_COLORS, DEFAULT_COLOR_IDX): New defines.
(glyph): New members `back_color_idx' and `fore_color_idx'.
(glyph::order): Add COLOR_CHANGE.
(tty_printer): New members `cur_fore_idx', `curr_back_idx',
`is_underline', `is_bold', `cu_flag', `tty_colors'.
New methods `make_underline', `make_bold', `color_to_idx',
`change_color', `put_color'.
(cu_flag): Moved into `tty_printer' class.
(tty_printer::tty_printer): Initialize colors.
(tty_printer::add_char, tty_printer::set_char, tty_printer::special,
tty_printer::draw, tty_printer::end_page): Handle colors also.
(main): Add options `-c' and `-i'.
(usage): Updated.
* NEWS, src/devices/grotty/grotty.man: Updated.

* src/include/errarg.h (errarg): Add support for `unsigned int'.
* src/libs/libgroff/errarg.c: Implement it.

* src/include/printer.h (printer): Add `change_color' method
(currently used by grotty only).
* src/libs/libdriver/printer.cc: Implement it.
* src/libs/libdriver/input.cc (parse_D_command, do_file): Add
call to `pr->change_color'.

* src/roff/troff/node.cc (troff_output_file::fill_color,
troff_output_file::glyph_color): Call `do_motion'.

* tmac/tty.tmac: Add color definitions.

* src/roff/groff/groff.man: Minor fixes.

1 files changed, 42 insertions, 8 deletions

diff --git a/NEWS b/NEWS
index 0994deac..3626bf1e 100644
--- a/NEWS
+++ b/NEWS
@@ -7,14 +7,14 @@ VERSION 1.18
 Troff
 -----
 
-o Color support has been added to troff and pic (and to two device drivers,
-  grops and grohtml -- other preprocessors and drivers will follow).  A new
-  function `defcolor' defines colors; the escape sequence `\m' sets the
-  drawing color, the escape sequence `\M' specifies the background color for
-  closed objects created with \D'...' commands.  Similar to fonts, `\mP' and
-  `\MP' switch back to the previous color.  `\m' and `\M' correspond to the
-  new troff output commands `m' and `DF'.  The device-specific default color
-  is called `default' and can't be redefined.
+o Color support has been added to troff and pic (and to the device drivers
+  grops, grotty, and grohtml -- other preprocessors and drivers will
+  follow).  A new function `defcolor' defines colors; the escape sequence
+  `\m' sets the drawing color, the escape sequence `\M' specifies the
+  background color for closed objects created with \D'...' commands.
+  Similar to fonts, `\mP' and `\MP' switch back to the previous color.  `\m'
+  and `\M' correspond to the new troff output commands `m' and `DF'.  The
+  device-specific default color is called `default' and can't be redefined.
 
   Outputting color can be disabled in troff and groff with the option -c
   (it is always disabled in compatibility mode).
@@ -100,6 +100,13 @@ Groff
 o The new command line option `-c' disables color output (which is always
   disabled in compatibility mode).
 
+Nroff
+-----
+
+o Two new command line options `-c' and `-C'; the former passes `-c' to
+  grotty (switching to the old output scheme); the latter passes `-C' to
+  groff (enabling compatibility mode).
+
 Pic
 ---
 
@@ -132,6 +139,33 @@ Grops
 
 o Color support has been added.
 
+
+Grotty
+------
+
+o Color support has been added, using the SGR (ISO 6429, sometimes called
+  ANSI color) escape sequences.
+
+o SGR escape sequences are now used by default for underlining and bold
+  printing also, no longer using the backspace character trick.  To revert
+  to the old behaviour, use the `-c' switch.
+
+  Note that you have to use the `-R' option of `less' to make SGR escapes
+  display correctly.  On the other hand, terminal programs and consoles like
+  `xterm' which support SGR sequences natively can directly display the
+  output of grotty.  Consequently, the options `-b', `-B', `-u', and `-U'
+  work only in combination with `-c' and are ignored silently otherwise.
+
+  For the `man' program, it may be necessary to add the `-R' option of
+  `less' to the $PAGER environment variable; alternatively, you can use
+  `man's `-P' option (or adapt its configuration file accordingly).  See
+  man(1) for more details.
+
+o If the new option `-i' is used (only in SGR mode), grotty sends escape
+  sequences to set the italic font attribute instead of the underline
+  attribute for italic fonts.  Note that many terminals don't have support
+  for this (including xterm).
+
 Grohtml
 -------