day 3 part 1

solutions/day03/example.txt

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+xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))

solutions/day03/solution.nim

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+import std/[strutils, sequtils, math]
+import aoc
+
+proc parseInstruction(i: string): (int, int) =
+  let s =  i.split(',')
+  echo s
+  assert s.len == 2
+  result = (parseInt(s[0]), parseInt(s[1]))
+
+
+
+proc parseInput(input: string): seq[(int, int)] =
+  var i: int
+  while i < input.len:
+    case input[i]
+    of 'm':
+      # ul(x,y)
+      # not enough space so bail
+      if i > (input.len - 6): return
+      else:
+        var instruction: string
+        if input[i .. i+3] == "mul(":
+          i += 4
+          while true:
+            let c = input[i]
+            case c:
+              of '0'..'9':
+                instruction.add c; inc i
+              of ')':
+                result.add parseInstruction instruction
+                break
+              of ',':
+                instruction.add c; inc i
+              else: break
+        inc i
+    else: inc i
+
+
+      # var xy: (int, int)
+
+
+proc partOne*(input: string): int =
+  let instructions = parseInput(input)
+  instructions.mapIt(it[0] * it[1]).sum()
+
+
+# proc partTwo*(input: string): int = 0
+#
+solve:
+  "example.txt":
+    partOne: 161
+    # partTwo: 0
+  "input.txt":
+    partOne: 0
+  #   partTwo: 0