2023: Day 1

2023/day1/README.md

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+I completed this one with just shell tools.
+
+Day 1:
+
+    zsh day1.zsh ../input/day1.txt
+
+Day 2:
+
+    zsh day1.2.zsh ../input/day1.txt

2023/day1/day1.2.awk

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+BEGIN {
+  map["one"] = 1
+  map["two"] = 2
+  map["three"] = 3
+  map["four"] = 4
+  map["five"] = 5
+  map["six"] = 6
+  map["seven"] = 7
+  map["eight"] = 8
+  map["nine"] = 9
+}
+
+{
+  pos = match($0, "one|two|three|four|five|six|seven|eight|nine")
+  if (pos != 0) {
+    numeral = substr($0, RSTART, RLENGTH)
+    digit = map[numeral]
+    sub(numeral, digit)
+  }
+  print
+}
+

2023/day1/day1.2.rev.awk

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+BEGIN {
+  map["eno"] = 1
+  map["owt"] = 2
+  map["eerht"] = 3
+  map["ruof"] = 4
+  map["evif"] = 5
+  map["xis"] = 6
+  map["neves"] = 7
+  map["thgie"] = 8
+  map["enin"] = 9
+}
+
+{
+  pos = match($0, "enin|thgie|neves|xis|evif|ruof|eerht|owt|eno")
+  if (pos != 0) {
+    numeral = substr($0, RSTART, RLENGTH)
+    digit = map[numeral]
+    sub(numeral, digit)
+  }
+  print
+}
+

2023/day1/day1.2.zsh

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+#!/bin/zsh
+
+paste -d '\0' \
+  <(awk -f day1.2.awk $1 | tr -d a-z | rg -o '^.')   \
+  <(rev $1 | awk -f day1.2.rev.awk | rev | tr -d a-z | rg -o '.$') | \
+  awk 'BEGIN { sum = 0 } { sum += $0 } END { print sum }'

2023/day1/day1.zsh

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+#!/bin/zsh
+
+paste -d '\0' <(tr -d a-z < $1 | rg -o ^.) <(tr -d a-z < $1 | rg -o .$) | \
+  awk 'BEGIN { sum = 0 } { sum += $0 } END { print sum }'