Use bash arrays, pipe from part 1 to part 2

2024/day-5/solution-2.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-rm key-*
+{
   while read -r LINE
   do
     GREP_EXPR=$( printf "%s"  "$LINE" | tr ',' '|' )
@@ -20,30 +20,39 @@ do
   
     # Don't process for valid lines
     [[ $PASS_RULES -eq 0 ]] && continue
+    printf "%s\n" "$LINE"
   
-  # Generate a hashmap and rebuild the entire line from rules
-  CACHED_LINE=$LINE
-  while [[ $( printf "%s" "$CACHED_LINE" | tr ',' '\n' | wc -c ) -gt 0 ]]
+  done < input-updates
+} | {
+  while read -r LINE # Generate a hashmap and rebuild the entire line from rules
+  do
+    CACHED_LINE=$( printf "%s" "$LINE" | tr ',' '\n' )
+    while [[ $( printf "%s" "$CACHED_LINE" | wc -c ) -gt 0 ]]
     do
       # Loop through rules and build all the KVs
-    rm key-*
-    DAG_GREP_EXPR=$( printf "%s"  "$CACHED_LINE" | tr ',' '|' )
-    while read -r RULE
-    do
-      KEY=$( printf "%s" "$RULE" | cut -f1 -d'|' )
-      VALUE=$( printf "%s" "$RULE" | cut -f2 -d'|' )
-      printf "%s" "$VALUE" > key-"$KEY"
-    done <<< "$( < input-rules grep -E "($DAG_GREP_EXPR)\\|($DAG_GREP_EXPR)" )" 
-    KEY=$( printf "%s"  "$CACHED_LINE" | tr ',' '\n' | head -1 )
+      DAG_GREP_EXPR=$( printf "%s"  "$CACHED_LINE" | paste -s -d '|' )
+      KV_ARRAY=( $( < input-rules grep -E "($DAG_GREP_EXPR)\\|($DAG_GREP_EXPR)" | tr '|' ' ' | paste -s -d ' ') )
       # Going through dependencies to find final key
-    while [[ -f key-$KEY ]]
+      KEY=${KV_ARRAY[0]}
+      while true
       do
-      KEY=$( cat "key-$KEY" )
+        BREAK=0
+        for (( i=0; i<${#KV_ARRAY[@]}; i+=2 )) # Check if key exists
+        do
+          if [[ ${KV_ARRAY[$i]} -eq $KEY ]]
+          then
+            KEY=${KV_ARRAY[$i+1]}
+	    BREAK=1
+	    break
+          fi
+        done
+	if [[ $BREAK -eq 1 ]] ; then continue ; else break ; fi
       done
       printf "%s\n" "$KEY"
-    CACHED_LINE=$( printf "%s" "$CACHED_LINE" | tr ',' '\n' | grep -v "$KEY" | paste -s -d ',' )
+      CACHED_LINE=$( printf "%s" "$CACHED_LINE" | grep -v "$KEY" )
     done | tac | paste -s -d' '
-done < input-updates |
+  done 
+} |
   tee final-output |
   awk '
   BEGIN{ total = 0 }