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Viewing file:     eight-bit.txt (4.7 KB)      -rw-r--r--

How  to use 8 bit characters by Johan Widen (jw@sics.se) and
Per Hedeland (per@erix.ericsson.se)


     (Disclaimer: This is really a  sketch  of  an  approach
rather  than  a "how-to" document.  Also, it is mostly rele-
vant to Swedish X Window users...)


     The way I use this facility at present is to add  lines
such as the following to my .cshrc:

setenv NOREBIND
setenv LC_CTYPE iso_8859_1
foreach key ( \\304 \\305 \\326 \\344 \\345 \\366 )
   bindkey $key self-insert-command
end


     Note that if I used a system with a reasonably complete
NLS (and a tcsh compiled to use it), all of the above  could
be  replaced  with simply setting the LANG environment vari-
able to an appropriate value - the NLS would  then  indicate
exactly which characters should be considered printable, and
tcsh would do the  rebinding  of  these  automatically.  The
above  works  for  tcsh's  simulated  NLS and for the NLS in
SunOS 4.1  -  without  the  NOREBIND  setting,  all  of  the
Meta-<non-control-character>  bindings  would  be  undone in
these cases.


     These keybindings are the codes for my national charac-
ters,  but  the bindings (M-d, M-e etc) are not conveniently
placed.  They are however consistent with  what  other  pro-
grams will see.


     Now:  I actually want the character \304 to be inserted
when I press say '{' together with a modifier  key.  I  want
the behavior to be the same not only in tcsh but in say cat,
an editor and all other programs. I fix this by performing a
keyboard  remapping  with  the xmodmap program (I use X Win-
dows).


     I give xmodmap an input something like the following:

keycode 26 = Mode_switch
add mod2 = Mode_switch
! if you want Mode_switch to toggle, at the expense of losing
! Caps- or whatever Lock you currently have, add the two lines below
! clear Lock
! add Lock = Mode_switch













!       Binds swedish characters on ][\
!
keycode 71 = bracketleft braceleft adiaeresis Adiaeresis
keycode 72 = bracketright braceright aring Aring
keycode 95 = backslash bar odiaeresis Odiaeresis

or:

keysym Alt_R = Mode_switch
add mod2 = Mode_switch
keysym bracketleft = bracketleft braceleft Adiaeresis adiaeresis
keysym bracketright = bracketright braceright Aring aring
keysym backslash = backslash bar Odiaeresis odiaeresis

Another, more portable way of doing the same thing is:

#!/bin/sh
# Make Alt-] etc produce the "appropriate" Swedish iso8859/1 keysym values
# Should handle fairly strange initial mappings

xmodmap -pk | sed -e 's/[()]//g' | \
awk 'BEGIN {
        alt["bracketright"] = "Aring"; alt["braceright"] = "aring";
        alt["bracketleft"] = "Adiaeresis"; alt["braceleft"] = "adiaeresis";
        alt["backslash"] = "Odiaeresis"; alt["bar"] = "odiaeresis";
}
NF >= 5 && (alt[$3] != "" || alt[$5] != "") {
        printf "keycode %s = %s %s ", $1, $3, $5;
        if (alt[$3] != "") printf "%s ", alt[$3];
        else printf "%s ", $3;
        printf "%s\n", alt[$5];
        next;
}
alt[$3] != "" {
        printf "keycode %s = %s %s %s\n", $1, $3, $3, alt[$3];
}
NF >= 5 && ($3 ~ /^Alt_[LR]$/ || $5 ~ /^Alt_[LR]$/) {
        printf "keycode %s = %s %s Mode_switch\n", $1, $3, $5;
        if ($3 ~ /^Alt_[LR]$/) altkeys = altkeys " " $3;
        else altkeys = altkeys " " $5;
        next;
}
$3 ~ /^Alt_[LR]$/ {
        printf "keycode %s = %s %s Mode_switch\n", $1, $3, $3;
        altkeys = altkeys " " $3;
}
END {
        if (altkeys != "") printf "clear mod2\nadd mod2 =%s\n", altkeys;
}' | xmodmap -


     Finally, with the binding of the codes of  my  national
characters to self-insert-command, I lost the ability to use













the Meta key to call the functions previously bound to  M-d,
M-e,  and  M-v  (<esc>d etc still works).  However, with the
assumption that most of my input to tcsh will be through the
xterm  terminal  emulator,  I  can get that ability back via
xterm bindings!  Since M-d is the only one of the "lost" key
combinations  that  was  actually  bound to a function in my
case, and it had the same binding as M-D, I can use the fol-
lowing in my .Xdefaults file:

XTerm*VT100.Translations:       #override \n\
                        Meta ~Ctrl<Key>d:       string(0x1b) string(d)

- or, if I really want a complete mapping:

XTerm*VT100.Translations:       #override \n\
                        :Meta ~Ctrl<Key>d:      string(0x1b) string(d) \n\
                        :Meta ~Ctrl<Key>D:      string(0x1b) string(D) \n\
                        :Meta ~Ctrl<Key>e:      string(0x1b) string(e) \n\
                        :Meta ~Ctrl<Key>E:      string(0x1b) string(E) \n\
                        :Meta ~Ctrl<Key>v:      string(0x1b) string(v) \n\
                        :Meta ~Ctrl<Key>V:      string(0x1b) string(V)