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#!/bin/bash
#NOTE, because bash arrays are just string delimited by space, we will not be
#using space as our empty character but .
rawbuff=()
function load_raw () {
while read -r line; do
if [ "$line" = "END_RAW" ]; then
return
else
rawbuff=("${rawbuff[@]}" "$line")
fi
done
}
function load_point() {
read -r x
read -r y
read -r c
line=${rawbuff[$y]}
#construct a sed prompt that replaces the xth character
prompt="s/^\(.\{$x\}\).\(.*\)$/\1$c\2/"
rawbuff[$y]=$(echo "$line" | sed "$prompt")
}
function print_raw () {
for line in "${rawbuff[@]}"; do
echo "$line"
done
}
function canvas() {
read -r w
read -r h
ln=""
i=0
while [ $i -lt $w ];do
ln="$ln."
i=$(($i + 1))
done
j=0
while [ $j -lt $h ]; do
rawbuff=("${rawbuff[@]}" "$ln")
j=$(($j+1))
done
}
#prints a single braille at $1=x $2=y
function print_sin_braille() {
#NOTE, for optimization purposes, this only works if the buffer consits of 1s
#and 0s
#bit to braille
#
#0 3
#1 4
#2 5
#6 7
#reverse
#(1,3)(0,3)(1,2)(1,1)(1,0)(0,2)(0,1)(0,0)
b0=${rawbuff[((0+4*$2))]:((0+2*$1)):1}
b1=${rawbuff[((1+4*$2))]:((0+2*$1)):1}
b2=${rawbuff[((2+4*$2))]:((0+2*$1)):1}
b3=${rawbuff[((0+4*$2))]:((1+2*$1)):1}
b4=${rawbuff[((1+4*$2))]:((1+2*$1)):1}
b5=${rawbuff[((2+4*$2))]:((1+2*$1)):1}
b6=${rawbuff[((3+4*$2))]:((0+2*$1)):1}
b7=${rawbuff[((3+4*$2))]:((1+2*$1)):1}
#ors it with the utf-8 hex value of the empty braille character
#the two spaces assume aht the encoding is utf-8, convoluted bitwise OR
#and coversion between character and number stuff
echo "obase=16;$(( 2#$b7${b6}00$b5$b4$b3$b2$b1$b0 | 0xE2A080 ))"|bc | xxd --reverse -ps
}
function print_braille() {
#I do the lazy thing and just test the first line
w=${#rawbuff[0]}
h=${#rawbuff[@]}
#conver to braille coords, we do not want to try to print incomplete
#characters because they will break with our optimization, so rounding
#down is good
w=$((w/2))
h=$((h/4))
i=0
j=0
while [ $i -lt $h ]; do
j=0
while [ $j -lt $w ]; do
print_sin_braille $j $i
j=$(($j+1))
done
#just want a new line
echo
i=$(($i+1))
done
}
while read -r line; do
if [ "$line" = "LOAD_RAW" ]; then
load_raw
elif [ "$line" = "LOAD_POINT" ]; then
load_point
elif [ "$line" = "PRINT_RAW" ]; then
print_raw
elif [ "$line" = "CANVAS" ]; then
canvas
elif [ "$line" = "PRINT_BRAILLE" ]; then
print_braille
elif [ "$line" = "END" ]; then
exit
fi
done
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