# Report bugs and new terminal descriptions to
# bug-ncurses@gnu.org
#
-# $Revision: 1.500 $
-# $Date: 2014/06/07 17:07:45 $
+# $Revision: 1.501 $
+# $Date: 2014/06/09 21:40:50 $
#
# The original header is preserved below for reference. It is noted that there
# is a "newer" version which differs in some cosmetic details (but actually
# S0 (str) Switch charset 'G0' to the specified charset.
# E0 (str) Switch charset 'G0' back to standard charset.
#
-# tested with screen 3.09.08
+# Initially tested with screen 3.09.08
+#
+# According to its manual page
+#
+# Screen is a full-screen window manager that multiplexes a physical
+# terminal between several processes (typically interactive shells). Each
+# virtual terminal provides the functions of a DEC VT100 terminal and, in
+# addition, several control functions from the ISO 6429 (ECMA 48, ANSI
+# X3.64) and ISO 2022 standards (e.g. insert/delete line and support for
+# multiple character sets).
+#
+# However, there is a design error in its support for video highlights. The
+# program uses a table (rendlist) which equates the SGR codes to terminal
+# capabilities. That, and color-decoding are hardcoded in screen; its behavior
+# is modified only by the presence or absence of the corresponding capabilities.
+# Not by their values.
+#
+# If screen sets the TERMCAP variable, it uses hardcoded strings which
+# correspond to the rendlist table.
+#
+# The table gives this information:
+#
+# SGR capability
+# --- ---------
+# 1 bold
+# 2 dim
+# 3 standout
+# 4 underline
+# 5 blink
+# - (unused 6)
+# 7 reverse
+# - (unused 8-21)
+# 22 reset bold, standout and dim
+# 23 reset standout
+# 24 reset underline
+# 25 reset blink
+# - (unused 26)
+# 27 reset reverse
+#
+# ECMA-48 differs from this: 3 and 23 set and reset italics, respectively.
+# ECMA-48 does not define "standout" - that is a termcap/terminfo abstraction.
+# Without some redesign of screen, it is not possible to extend the set of
+# capabilities. Substitution would be possible, e.g., sending italics in
+# place of underline.
+#
+# Because screen uses hard-coded parsing, it does not check if two capabilities
+# use the same value. For example, changing standout to be the same as any of
+# the other capabilities will confuse screen. Curses applications which use
+# sgr are not impacted (because that usually resets all capabilities before
+# setting any), but termcap applications do not use sgr -TD
screen|VT 100/ANSI X3.64 virtual terminal,
OTbs, OTpt, am, km, mir, msgr, xenl, G0,
colors#8, cols#80, it#8, lines#24, ncv@, pairs#64, U8#1,
nel=\EE, rc=\E8, rev=\E[7m, ri=\EM, rmacs=^O,
rmcup=\E[?1049l, rmir=\E[4l, rmkx=\E[?1l\E>, rmso=\E[23m,
rmul=\E[24m, rs2=\Ec\E[?1000l\E[?25h, sc=\E7,
- sgr=\E[0%?%p6%t;1%;%?%p1%t;7%;%?%p2%t;4%;%?%p3%t;7%;%?%p4%t;5%;m%?%p9%t\016%e\017%;,
+ sgr=\E[0%?%p6%t;1%;%?%p1%t;3%;%?%p2%t;4%;%?%p3%t;7%;%?%p4%t;5%;m%?%p9%t\016%e\017%;,
sgr0=\E[m\017, smacs=^N, smcup=\E[?1049h, smir=\E[4h,
- smkx=\E[?1h\E=, smso=\E[7m, smul=\E[4m, tbc=\E[3g, E0=\E(B,
+ smkx=\E[?1h\E=, smso=\E[3m, smul=\E[4m, tbc=\E[3g, E0=\E(B,
S0=\E(%p1%c, use=ecma+color,
# The bce and status-line entries are from screen 3.9.13 (and require some
# changes to .screenrc).
screen+fkeys|function-keys according to screen,
kend=\E[4~, kf1=\EOP, kf2=\EOQ, kf3=\EOR, kf4=\EOS, kfnd@,
khome=\E[1~, kslt@,
+
+# See explanation before "screen" entry. Cancel italics so that applications
+# do not assume screen supports the feature. Add this tweak to entries which
+# extend screen for terminals which do support italics.
+screen+italics|screen cannot support italics,
+ ritm@, sitm@,
#
# Here are a few customized entries which are useful -TD
#
screen.xterm-xfree86|screen.xterm-new|screen customized for modern xterm,
bce@, bw,
invis@, kIC@, kNXT@, kPRV@, meml@, memu@,
- sgr=%?%p9%t\E(0%e\E(B%;\E[0%?%p6%t;1%;%?%p2%t;4%;%?%p1%p3%|%t;7%;%?%p4%t;5%;%?%p5%t;2%;m,
- E3@, use=screen+fkeys, use=xterm-new,
+ sgr=%?%p9%t\E(0%e\E(B%;\E[0%?%p6%t;1%;%?%p2%t;4%;%?%p1%p3%|%t;7%;%?%p4%t;5%;m,
+ E3@, use=screen+italics, use=screen+fkeys, use=xterm-new,
# xterm-r6 does not really support khome/kend unless it is propped up by
# the translations resource.
screen.xterm-r6|screen customized for X11R6 xterm,
screen.mrxvt|screen in mrxvt,
use=screen+fkeys, use=mrxvt,
screen.vte|screen in any VTE-based terminal,
- use=screen+fkeys, use=vte,
+ use=screen+italics, use=screen+fkeys, use=vte,
screen.gnome|screen in GNOME Terminal,
- use=screen+fkeys, use=gnome,
+ use=screen+italics, use=screen+fkeys, use=gnome,
screen.konsole|screen in KDE console window,
- use=screen+fkeys, use=konsole,
+ use=screen+italics, use=screen+fkeys, use=konsole,
# fix the backspace key
screen.linux|screen in linux console,
bw,
# defbce on
screen-bce.xterm-new|screen optimized for modern xterm,
bce,
- ech@, use=screen.xterm-new,
+ ech@, use=screen+italics, use=screen.xterm-new,
screen-bce.rxvt|screen optimized for rxvt,
bce,
ech@, use=screen.rxvt,
ech@, use=screen.mrxvt,
screen-bce.gnome|screen optimized for GNOME-Terminal,
bce,
- ech@, use=screen.gnome,
+ ech@, use=screen+italics, use=screen.gnome,
screen-bce.konsole|screen optimized for KDE console window,
bce,
- ech@, use=screen.konsole,
+ ech@, use=screen+italics, use=screen.konsole,
screen-bce.linux|screen optimized for linux console,
bce,
ech@, use=screen.linux,
# (italic). This was a long-ago typo in screen 3.1.1 which was
# overlooked until a few terminal emulators implemented the feature -TD
#
+# 2014-06-09
+# + revert the change to screen; see notes for why this did not work -TD
+# + cancel sitm/ritm for entries which extend "screen", to work around
+# screen's hardcoded behavior for SGR 3 -TD
+#
######## SHANTIH! SHANTIH! SHANTIH!
projects / ncurses.git / commitdiff