1 files changed, 78 insertions, 0 deletions
diff --git a/aoc2023/src/day1/solve.gleam b/aoc2023/src/day1/solve.gleam
new file mode 100644
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+++ b/aoc2023/src/day1/solve.gleam
@@ -0,0 +1,78 @@
+import adglent.{First, Second}
+import gleam/io
+import gleam/list
+import gleam/string
+import gleam/regex
+import gleam/result
+import gleam/int
+
+fn parse_digits(input: String) {
+  let assert Ok(re) = regex.from_string("[0-9]")
+
+  input
+  |> string.split("\n")
+  |> list.map(fn(s) {
+    let matches =
+      regex.scan(s, with: re)
+      |> list.map(fn(m) { m.content })
+
+    case matches {
+      [one] -> int.parse(one <> one)
+      _ ->
+        int.parse(
+          result.unwrap(list.first(matches), "") <> result.unwrap(
+            list.last(matches),
+            "",
+          ),
+        )
+    }
+  })
+}
+
+pub fn part1(input: String) {
+  input
+  |> parse_digits
+  |> result.values
+  |> int.sum
+  |> string.inspect
+}
+
+const substitutions = [
+  #("one", "o1e"),
+  #("two", "t2o"),
+  #("three", "t3e"),
+  #("four", "4"),
+  #("five", "5e"),
+  #("six", "6"),
+  #("seven", "7n"),
+  #("eight", "e8t"),
+  #("nine", "n9e"),
+  #("zero", "0o"),
+]
+
+pub fn part2(input: String) {
+  list.fold(
+    over: substitutions,
+    from: input,
+    with: fn(acc, sub) {
+      let #(from, to) = sub
+      string.replace(in: acc, each: from, with: to)
+    },
+  )
+  |> part1
+}
+
+pub fn main() {
+  let assert Ok(part) = adglent.get_part()
+  let assert Ok(input) = adglent.get_input("1")
+  case part {
+    First ->
+      part1(input)
+      |> adglent.inspect
+      |> io.println
+    Second ->
+      part2(input)
+      |> adglent.inspect
+      |> io.println
+  }
+}