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b5f5bf6f03
libncurses in base system only supports termcap(5). RGB has 3 colors
but termcap(5) supports at most 2 arguments e.g.,
$ export TERMCAP="${TERM}:Co#0x1000000:AF=\E[38;2;%d;%d;%dm:AB=\E[48;2;%d;%d;%dm:tc=${TERM}:"
$ tput AB 1 1 1
tput: too many arguments (3) for capability `AB'
To work around the limitation make Emacs check if environ(7) has
COLORTERM=truecolor some terminal emulators define by default e.g.,
- x11-toolkits/vte3 (gnome-terminal, sakura, ...)
- x11/alacritty
- x11/aminal
- x11/kitty (bug 233010)
- x11/konsole
- x11/qterminal
while others require defining COLORTERM=truecolor manually e.g.,
- x11/cool-retro-term
- x11/sterm
- x11/xterm
PR: 247248
Approved by: jrm
Obtained from: upstream
35 lines
1.4 KiB
Plaintext
35 lines
1.4 KiB
Plaintext
Add RGB fallback if environment has COLORTERM=truecolor
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https://github.com/emacs-mirror/emacs/commit/50f489b5dc59
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--- doc/misc/efaq.texi.orig 2019-01-07 14:26:06 UTC
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+++ doc/misc/efaq.texi
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@@ -1603,6 +1603,10 @@ Currently there's no standard way to determine whether
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supports direct color mode. If such standard arises later on, support
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for @samp{setb24} and @samp{setf24} may be removed.
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+If Terminfo database is not available, but 24-bit direct color mode is
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+supported, it can still be enabled by defining the environment
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+variable @env{COLORTERM} to @samp{truecolor}.
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+
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@node Debugging a customization file
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@section How do I debug a @file{.emacs} file?
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@cindex Debugging @file{.emacs} file
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--- src/term.c.orig 2019-01-07 14:26:07 UTC
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+++ src/term.c
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@@ -4157,6 +4157,15 @@ use the Bourne shell command 'TERM=...; export TERM' (
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tty->TS_set_background = bg;
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tty->TN_max_colors = 16777216;
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}
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+ /* Fall back to xterm+direct (semicolon version) if requested
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+ by the COLORTERM environment variable. */
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+ else if ((bg = getenv("COLORTERM")) != NULL
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+ && strcasecmp(bg, "truecolor") == 0)
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+ {
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+ tty->TS_set_foreground = "\033[%?%p1%{8}%<%t3%p1%d%e38;2;%p1%{65536}%/%d;%p1%{256}%/%{255}%&%d;%p1%{255}%&%d%;m";
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+ tty->TS_set_background = "\033[%?%p1%{8}%<%t4%p1%d%e48;2;%p1%{65536}%/%d;%p1%{256}%/%{255}%&%d;%p1%{255}%&%d%;m";
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+ tty->TN_max_colors = 16777216;
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+ }
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}
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#endif
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