Initial Commit

1 files changed, 117 insertions, 0 deletions

diff --git a/bbrll b/bbrll
new file mode 100755
index 0000000..661fd14
--- /dev/null
+++ b/bbrll
@@ -0,0 +1,117 @@
+#!/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 $2=y
+function print_sin_braille() {
+#bit to braille 
+#
+#0 3
+#1 4
+#2 5
+#6 7
+#reverse 
+#(1,3)(0,3)(1,2)(1,1)(1,0)(0,2)(0,1)(0,0)
+	#converts anything other than ., and empty string, or space into 1, else
+	#0
+	prompt='s/[^\. ]/1/;s/^[^1]*$/0/'
+
+	b0=$( echo ${rawbuff[((0+4*$2))]:((0+2*$1)):1} | sed "$prompt" )
+	b1=$( echo ${rawbuff[((1+4*$2))]:((0+2*$1)):1} | sed "$prompt" )
+	b2=$( echo ${rawbuff[((2+4*$2))]:((0+2*$1)):1} | sed "$prompt" )
+	b3=$( echo ${rawbuff[((0+4*$2))]:((1+2*$1)):1} | sed "$prompt" )
+	b4=$( echo ${rawbuff[((1+4*$2))]:((1+2*$1)):1} | sed "$prompt" )
+	b5=$( echo ${rawbuff[((2+4*$2))]:((1+2*$1)):1} | sed "$prompt" )
+	b6=$( echo ${rawbuff[((3+4*$2))]:((0+2*$1)):1} | sed "$prompt" )
+	b7=$( echo ${rawbuff[((3+4*$2))]:((1+2*$1)):1} | sed "$prompt" )
+	#echo "2#$b7$b600$b5$b4$b3$b2$b1$b0"
+	#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$b0 | 0x$(echo -n ⠀ |xxd -p -u)))" |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, since bash rounds down, account for when
+	#there a braille character that will not be completely filled(it can
+	#handle this fine because of how the sed pattern was constructed in
+	#print_sin_braille)
+	if [ $((w % 2)) -gt 0 ]; then
+		w=$((w/2+1))
+	else
+		w=$((w/2))
+	fi
+	if [ $((h % 4)) -gt 0 ]; then
+		h=$((h/4+1))
+	else
+		h=$((h/4))
+	fi
+	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