shfmt

day01.sh

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-unset PATH; readonly PATH
+unset PATH
+readonly PATH
 source ./utils/main.sh
 source ./utils/array.sh
 
@@ -7,20 +8,18 @@ p1() {
   local input="$1" a b tmp i
   local left=() right=() res=()
 
-  
   while read -r a b; do
     left+=("$a")
     right+=("$b")
-  done <<< "$input"
+  done <<<"$input"
 
   array.timsort left
   array.timsort right
 
-  for ((i=0; i < ${#left[@]}; i++)); do
+  for ((i = 0; i < ${#left[@]}; i++)); do
     tmp="$((left[i] - right[i]))"
-    echo "${left[$i]} - ${right[$i]} = ${tmp#-}"
     res+=("${tmp#-}")
-  done > log
+  done
 
   array.sum res
 }
@@ -29,18 +28,17 @@ p2() {
   local input="$1" a b i j
   local left=() right=() res=()
 
-  
   while read -r a b; do
     left+=("$a")
     right+=("$b")
-  done <<< "$input"
+  done <<<"$input"
 
   for i in "${left[@]}"; do
     local tmp=0
     for j in "${right[@]}"; do
-      (( i == j )) && ((tmp++))
+      ((i == j)) && ((tmp++))
     done
-    res+=("$((i*tmp))")
+    res+=("$((i * tmp))")
   done
 
   array.sum res

day02.sh

@@ -1,14 +1,15 @@
 #!/usr/bin/env bash
-unset PATH; readonly PATH
+unset PATH
+readonly PATH
 source ./utils/main.sh
 source ./utils/array.sh
 
 is_report_valid() {
   local report=() current_sign='' i=0
-  read -ra report <<< "$1"
+  read -ra report <<<"$1"
 
-  for (( i = 0; i < ${#report[@]} - 1; i++ )); do
+  for ((i = 0; i < ${#report[@]} - 1; i++)); do
-    local a="${report[i]}" b="${report[i+1]}" diff='' sign=''
+    local a="${report[i]}" b="${report[i + 1]}" diff='' sign=''
     diff="$((a - b))"
     ((${diff#-} >= 1 && ${diff#-} <= 3)) || return 1
 
@@ -30,7 +31,7 @@ p1() {
 
   while read -r line; do
     is_report_valid "$line" && ((result++))
-  done <<< "$input"
+  done <<<"$input"
 
   printf '%d' "$result"
 }
@@ -40,17 +41,17 @@ p2() {
 
   while read -r line; do
     local original_report
-    read -ra original_report <<< "$line"
+    read -ra original_report <<<"$line"
 
     is_report_valid "$line" && ((result++)) && continue
 
-    for (( i = 0; i < ${#original_report[@]}; i++ )); do
+    for ((i = 0; i < ${#original_report[@]}; i++)); do
       local report
-      report=("${original_report[@]::"$i"}" "${original_report[@]:"$((i+1))"}")
+      report=("${original_report[@]::"$i"}" "${original_report[@]:"$((i + 1))"}")
 
       is_report_valid "${report[*]}" && ((result++)) && continue 2
     done
-  done <<< "$input"
+  done <<<"$input"
 
   printf '%d' "$result"
 }

day03.sh

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-unset PATH; readonly PATH
+unset PATH
+readonly PATH
 source ./utils/main.sh
 
 p1() {
@@ -23,9 +24,9 @@ p2() {
   while [[ -n "$input" ]]; do
     if [[ "$input" =~ mul\(([0-9]{1,3}),([0-9]{1,3})\)|do\(\)|don\'t\(\) ]]; then
       case "${BASH_REMATCH[0]}" in
-        do\(\)) do=true;;
+        do\(\)) do=true ;;
-        don\'t\(\)) do=false;;
+        don\'t\(\)) do=false ;;
-        *) [[ "$do" == true ]] && result="$((result + (BASH_REMATCH[1] * BASH_REMATCH[2])))";;
+        *) [[ "$do" == true ]] && result="$((result + (BASH_REMATCH[1] * BASH_REMATCH[2])))" ;;
       esac
 
       input="${input#*"${BASH_REMATCH[0]}"}"

day04.sh

@@ -1,9 +1,11 @@
 #!/usr/bin/env bash
-unset PATH; readonly PATH
+unset PATH
+readonly PATH
 source ./utils/main.sh
 
 count_patterns_occurences() {
-  local input="$1"; shift
+  local input="$1"
+  shift
   local patterns=("$@") result=0
 
   for pattern in "${patterns[@]}"; do
@@ -25,18 +27,18 @@ count_patterns_occurences() {
 p1() {
   local input="$1" line result=0 cols=0
 
-  read -ra line <<< "$input"
+  read -ra line <<<"$input"
-  cols="$((${#line}+1))"
+  cols="$((${#line} + 1))"
 
   local patterns=(
     "XMAS"
     "SAMX"
     "X.{$((cols))}M.{$((cols))}A.{$((cols))}S"
     "S.{$((cols))}A.{$((cols))}M.{$((cols))}X"
-    "X.{$((cols-1))}M.{$((cols-1))}A.{$((cols-1))}S"
+    "X.{$((cols - 1))}M.{$((cols - 1))}A.{$((cols - 1))}S"
-    "S.{$((cols-1))}A.{$((cols-1))}M.{$((cols-1))}X"
+    "S.{$((cols - 1))}A.{$((cols - 1))}M.{$((cols - 1))}X"
-    "X.{$((cols-2))}M.{$((cols-2))}A.{$((cols-2))}S"
+    "X.{$((cols - 2))}M.{$((cols - 2))}A.{$((cols - 2))}S"
-    "S.{$((cols-2))}A.{$((cols-2))}M.{$((cols-2))}X"
+    "S.{$((cols - 2))}A.{$((cols - 2))}M.{$((cols - 2))}X"
   )
 
   count_patterns_occurences "$input" "${patterns[@]}"
@@ -45,14 +47,14 @@ p1() {
 p2() {
   local input="$1" line result=0 cols=0
 
-  read -ra line <<< "$input"
+  read -ra line <<<"$input"
-  cols="$((${#line}+1))"
+  cols="$((${#line} + 1))"
 
   local patterns=(
-    "M.M.{$((cols-2))}A.{$((cols-2))}S.S"
+    "M.M.{$((cols - 2))}A.{$((cols - 2))}S.S"
-    "M.S.{$((cols-2))}A.{$((cols-2))}M.S"
+    "M.S.{$((cols - 2))}A.{$((cols - 2))}M.S"
-    "S.M.{$((cols-2))}A.{$((cols-2))}S.M"
+    "S.M.{$((cols - 2))}A.{$((cols - 2))}S.M"
-    "S.S.{$((cols-2))}A.{$((cols-2))}M.M"
+    "S.S.{$((cols - 2))}A.{$((cols - 2))}M.M"
   )
 
   count_patterns_occurences "$input" "${patterns[@]}"

day05.sh

@@ -1,5 +1,6 @@
 #!/usr/bin/env bash
-unset PATH; readonly PATH
+unset PATH
+readonly PATH
 source ./utils/main.sh
 
 p1() {
@@ -9,21 +10,21 @@ p1() {
   while read -r line; do
     [[ -z "$line" ]] && continue
     case "$line" in
-      [0-9]*\|[0-9]*) rules+=([${line%|*}]="${rules["${line%|*}"]:-} ${line#*|}");;
+      [0-9]*\|[0-9]*) rules+=([${line%|*}]="${rules["${line%|*}"]:-} ${line#*|}") ;;
-      *) pages+=("$line");;
+      *) pages+=("$line") ;;
     esac
-  done <<< "$input"
+  done <<<"$input"
 
   for page in "${pages[@]}"; do
     local page_arr
-    IFS=, read -ra page_arr <<< "$page"
+    IFS=, read -ra page_arr <<<"$page"
 
-    for ((i=0; i < ${#page_arr[@]}; i++)); do
+    for ((i = 0; i < ${#page_arr[@]}; i++)); do
       local current_page="${page_arr[i]}"
       local current_rules="${rules["$current_page"]:-}"
       [[ -z "${current_rules:-}" ]] && continue
 
-      for ((j=0; j < ${#page_arr[@]}; j++)); do
+      for ((j = 0; j < ${#page_arr[@]}; j++)); do
         [[ "$current_rules" =~ ${page_arr[j]} ]] && ((j < i)) && continue 3
       done
     done
@@ -41,24 +42,24 @@ p2() {
   while read -r line; do
     [[ -z "$line" ]] && continue
     case "$line" in
-      [0-9]*\|[0-9]*) rules+=([${line%|*}]="${rules["${line%|*}"]:-} ${line#*|}");;
+      [0-9]*\|[0-9]*) rules+=([${line%|*}]="${rules["${line%|*}"]:-} ${line#*|}") ;;
-      *) pages+=("$line");;
+      *) pages+=("$line") ;;
     esac
-  done <<< "$input"
+  done <<<"$input"
 
   for page in "${pages[@]}"; do
     local page_arr incorrect='false'
-    IFS=, read -ra page_arr <<< "$page"
+    IFS=, read -ra page_arr <<<"$page"
 
-    for ((i=0; i < ${#page_arr[@]}; i++)); do
+    for ((i = 0; i < ${#page_arr[@]}; i++)); do
       local current_page="${page_arr[i]}"
       local current_rules="${rules["$current_page"]:-}"
       [[ -z "${current_rules:-}" ]] && continue
 
-      for ((j=0; j < ${#page_arr[@]}; j++)); do
+      for ((j = 0; j < ${#page_arr[@]}; j++)); do
         if [[ "$current_rules" =~ ${page_arr[j]} ]] && ((j < i)); then
           local removed_elem="${page_arr[j]}"
-          read -ra page_arr <<< "${page_arr[*]/"$removed_elem"}"
+          read -ra page_arr <<<"${page_arr[*]/"$removed_elem"/}"
           page_arr=("${page_arr[@]:0:$i}" "$removed_elem" "${page_arr[@]:$i}")
           incorrect='true'
           ((i--))