viz for day 4

Author: cgsdev0

2025/day04/p2-viz.sh

@@ -0,0 +1,85 @@
+#!/bin/bash
+
+FILE="$1"
+
+declare -A grid
+
+y=0
+while read line; do
+ x=0
+ while read -n1 c; do
+ [[ "$c" == "" ]] && continue
+ grid[$x,$y]=$c
+ ((x++))
+ done <<< "$line"
+ ((y++))
+done < "$FILE"
+
+mx=$x
+my=$y
+function print_grid() {
+ for ((y=0;y<my;++y)); do
+ for ((x=0;x<mx;++x)); do
+ echo -ne "${grid[$x,$y]}${grid[$x,$y]}"
+ done
+ echo
+ done
+}
+
+print_grid 1>&2
+
+function count_neighbors() {
+ local x=$1
+ local y=$2
+ local count=0
+ for ((a=-1; a<=1; a++)); do
+ for ((b=-1; b<=1; b++)); do
+ [[ a -eq b && a -eq 0 ]] && continue
+ local c="${grid[$((x+a)),$((y+b))]}"
+ [[ $c == "@" || $c == "x" ]] || continue
+ ((count++))
+ done
+ done
+ echo $count
+}
+
+mark_for_removal() {
+ marked=0
+ for ((y=0;y<my;++y)); do
+ for ((x=0;x<mx;++x)); do
+ c="${grid[$x,$y]}"
+ if [[ $c == "." ]]; then
+ continue
+ fi
+ count=${ count_neighbors $x $y; }
+ if [[ count -lt 4 ]]; then
+ grid[$x,$y]='\e[0;31mx\e[0;0m'
+ ((marked++))
+ fi
+ done
+ echo
+ done
+ echo $marked
+}
+
+function remove_the_x() {
+ for ((y=0;y<my;++y)); do
+ for ((x=0;x<mx;++x)); do
+ c="${grid[$x,$y]}"
+ [[ $c != "\e[0;31mx\e[0;0m" ]] && continue
+ grid[$x,$y]='.'
+ done
+ done
+}
+m=100
+total=0
+while [[ m -gt 0 ]]; do
+ m=${ mark_for_removal; }
+ tput cup 0 0
+ print_grid 1>&2
+ remove_the_x
+ tput cup 0 0
+ print_grid 1>&2
+ ((total+=m))
+done
+echo $total