Add day 8 part 1

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)

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