gbranden pushed a commit to branch master
in repository groff.
commit d9c53038a0fdee53ecd530a641887dc71384b74e
Author: G. Branden Robinson <[email protected]>
AuthorDate: Tue Jun 3 23:26:26 2025 -0500
grotty(1): Revise new `-t` material.
* Drop material instructing reader in use of other groff features.
* Add forward reference to `-t` option description when describing color
support.
* Describe details of SGR 38/48 support in `-t` option description.
* Escape hyphens used as Unix command-line option dashes.
* Recast.
---
src/devices/grotty/grotty.1.man | 49 ++++++++++++++---------------------------
1 file changed, 16 insertions(+), 33 deletions(-)
diff --git a/src/devices/grotty/grotty.1.man b/src/devices/grotty/grotty.1.man
index edac3db65..7e9736c80 100644
--- a/src/devices/grotty/grotty.1.man
+++ b/src/devices/grotty/grotty.1.man
@@ -9,7 +9,7 @@ output driver for typewriter-like (terminal) devices
.\" Legal Terms
.\" ====================================================================
.\"
-.\" Copyright (C) 1989-2024 Free Software Foundation, Inc.
+.\" Copyright (C) 1989-2025 Free Software Foundation, Inc.
.\"
.\" Permission is granted to make and distribute verbatim copies of this
.\" manual provided the copyright notice and this permission notice are
@@ -146,7 +146,8 @@ reverse video
[\[lq]negative image\[rq]]
and colors).
.
-By default, devices supporting the appropriate sequences can view
+Devices supporting
+SGR 30\[en]37 and 40\[en]47 sequences can view
.I roff
documents using eight different background and foreground colors.
.
@@ -165,36 +166,11 @@ and cyan.
Unrecognized colors are mapped to the default color,
which is dependent on the settings of the terminal.
.
-If
-.B -P-t
-is passed to groff (which sets
-.I grotty's
-.B -t
-flag - see below) it operates in TRUECOLOR mode and any
-RGB colour can be used as foreground and background.
-Many terminal emulators now support the TRUECOLOR extensions
-if your environment includes:-
-.P
-.RS
-COLORTERM="truecolor"
-.RE
-.P
-You specify the RGB colours using the usual:-
-.P
-.RS
-\&.defcolor mediumspringgreen rgb #00fa9a
-.P
-.RE
-NOTE: only rgb colour definitions are supported.
-.P
-And then use \[rs]m[...] and \[rs]M[...] to specify the foreground
-and background colours.
-The 8 legacy, 4 bit, colours (defined above) may look different when
-used with 24 bit colours. The reason is because although tty.tmac
-defines "yellow" as rgb #ffff00, it uses rgb #b26818 (or #e5cb3f for
-text when the bold font is selected), whereas for 24 bit colours the
-full #ffff00 is used, and using the bold font just bolds the text
-rather than alter the colour.
+Also see
+.B \-t
+in section \[lq]Options\[rq] below.
+.
+.
.P
OSC\~8 hyperlinks are produced for these devices.
.
@@ -619,7 +595,14 @@ is also specified.
.
.TP
.B \-t
-Use 24 bit "TRUECOLOR" extension rather than 4 bit legacy colours.
+Assume that the output device supports
+SGR\~38 and 48 escape sequences,
+which permit specification
+of character cell foreground and background colors
+in the RGB color space
+with 8 bits per channel.
+.
+.
.TP
.B \-u
Suppress the use of underlining for italic characters in legacy output
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