this is dumb

Author: cgsdev0

2024/day4/p1-alternate.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+function transpose() {
+  awk '{
+    split($0, chars, "")
+    for(j=1; j<=length(chars); j++) {
+      idx=(j)
+      a[idx]=a[idx]chars[j]
+    }
+  }
+  END{ for (i=1; i<=NR; i++) print a[i] }
+    '
+}
+
+FILE=$1
+
+SIZE=$(wc -l $FILE | cut -d' ' -f1)
+A=$((SIZE+1))
+B=$((SIZE-1))
+
+{
+  # horizontals
+  cat $FILE | grep -o "XMAS" | wc -l
+  cat $FILE | rev | grep -o "XMAS" | wc -l
+
+  # verticals
+  cat $FILE | transpose | grep -o "XMAS" | wc -l
+  cat $FILE | transpose | rev | grep -o "XMAS" | wc -l
+
+  # diagonals
+  tac $FILE |  tr '\n' '.' | grep -oP "X(?=.{$A}M.{$A}A.{$A}S)" | wc -l
+  cat $FILE |  tr '\n' '.' | grep -oP "X(?=.{$A}M.{$A}A.{$A}S)" | wc -l
+  tac $FILE |  tr '\n' '.' | grep -oP "X(?=.{$B}M.{$B}A.{$B}S)" | wc -l
+  cat $FILE |  tr '\n' '.' | grep -oP "X(?=.{$B}M.{$B}A.{$B}S)" | wc -l
+} | paste -sd+ | bc