From 85ef4400a937f483f5a755ffb11f9cae18abce0a Mon Sep 17 00:00:00 2001
From: Daniel Flanagan <daniel@lyte.dev>
Date: Mon, 7 Dec 2020 23:17:17 -0600
Subject: [PATCH] Add day 8 part 1

---
 2020/src/aoc2020.nim |  2 +-
 2020/src/day8.nim    | 27 +++++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 1 deletion(-)
 create mode 100644 2020/src/day8.nim

diff --git a/2020/src/aoc2020.nim b/2020/src/aoc2020.nim
index 73e4776..9908b30 100644
--- a/2020/src/aoc2020.nim
+++ b/2020/src/aoc2020.nim
@@ -9,4 +9,4 @@ proc solve_for_day(n: int) {.used.} =
 
 when isMainModule:
   # solve_all()
-  solve_for_day(7)
+  solve_for_day(8)
diff --git a/2020/src/day8.nim b/2020/src/day8.nim
new file mode 100644
index 0000000..3bc5e43
--- /dev/null
+++ b/2020/src/day8.nim
@@ -0,0 +1,27 @@
+import streams, strutils, sequtils, sets
+
+type
+  InstructionType = enum nop acc jmp
+  Instruction = ref object of RootObj
+    instruction: InstructionType
+    arg: int
+
+proc instructions(s: Stream): seq[Instruction] =
+  toSeq(s.lines).mapIt(it.split).mapIt(Instruction(instruction: parseEnum[InstructionType](it[0]), arg: parseInt(it[1].replace("+"))))
+
+proc part1*(s: Stream): int =
+  var hasRun = initHashSet[int]()
+  var p = 0
+  let code = s.instructions
+  while true:
+    if hasRun.contains p: return result
+    hasRun.incl p
+    let i = code[p]
+    case i.instruction:
+      of acc: inc result, i.arg
+      of jmp: p += i.arg; continue
+      else: discard
+    inc p
+
+proc part2*(s: Stream): int =
+  0