#!/bin/sh

# 0. Check whether we're on a console

TTY="`/usr/bin/tty`"

case "$TTY" in

	/dev/console|/dev/vc*|/dev/tty[0-9]*)

		;;

	*)

		echo "unicode_start skipped on $TTY" >&2

		exit 0

		;;

esac

# Enables Unicode processing in the current console.

#

# 1. The input side: the keyboard driver.

# Set the keyboard driver in Unicode mode. (Default is ASCII mode.)

# This really does nothing with the way normal keys are handled in

# the kernel. All it does is:

# - It is necessary for `dumpkeys' in order to not drop U+XXXX

#   entries from the keymaps.

# - It is necessary for `loadkeys' in order to avoid warnings.

# - Unicode characters typed as Alt-x1 ... Alt-xn (where x1,...,xn

#   are digits on the numeric keypad) will be emitted in UTF-8.

kbd_mode -u

# Change the keyboard mapping in such a way that the non-ASCII keys

# produce UTF-8 encoded multibyte sequences, instead of single bytes

# >= 0x80 in a legacy 8-bit encoding.

# Non-root users are allowed to change the unicode mode of their console, but

# not the global keymap. root will have to load the keymap in unicode mode

# explicitly.

uid="`id -u 2>/dev/null`" ||:

if [ "$uid" = '0' ]; then

	# There is no way of reverting the effect of "dumpkeys | loadkeys --unicode",

	# the memory of the earlier keymap is lost. Therefore, try

	# to save a copy of the original keymap to be able to reload it in unicode_stop.

	# (see also http://mail.nl.linux.org/linux-utf8/2003-08/msg00053.html):

	[ -n "$HOME" -a "$HOME" != '/' ] ||

		HOME='/root'

	if [ -d "$HOME" -a -w "$HOME" ]; then

		[ -d "$HOME/.kbd" ] ||

			mkdir -- "$HOME/.kbd"

		[ ! -w "$HOME/.kbd" ] ||

			dumpkeys > "$HOME/.kbd/.keymap_sv"

	fi

	# redirect stderr and stdout of loadkeys to /dev/null to avoid the confusing

	# "plus before udiaeresis ignored" warnings.

	dumpkeys | loadkeys --unicode > /dev/null 2>&1

fi

# 2. The output side: the console screen.

# Tell the console output driver that the bytes arriving are UTF-8

# encoded multibyte sequences.

if [ -t 1 -a -t 2 ]; then

	printf '\033%%G'

fi

stty iutf8

# Tell the graphics card how to display Unicode characters not

# contained in the IBM 437 character set (on PCs). The font should

# have a Unicode map attached, or explicitly specified, e.g.,

# by giving `def.uni' as a second argument.

case "$#" in

	2)

		setfont "$1" -u "$2"

		;;

	1)

		setfont "$1"

		;;

	0)

		;;

	*)

		echo "usage: unicode_start [font [unicode map]]"

		;;

esac