Lots of cleanup for nim solutions and day 2 solutions in nim

2021/.gitignore

@@ -1 +1,2 @@
 *.input
+build

2021/2.ts

@@ -1,11 +1,18 @@
 import { collectArray, inputLines, measureDuration } from "./common.ts";
 const input = await collectArray(await inputLines("2"));
 
+type SubmarineCommand = ["forward", number] | ["up", number] | ["down", number];
+
+// function parseSubmarineCommand(command: string): SubmarineCommand {
+//   let [cmd, arg] = command.split(" ", 2);
+//   cmd = ["forward", "up", "down"].includes(cmd) ? cmd : "up";
+//   return [cmd, parseInt(arg)];
+// }
+
 export function part1(input: string[]): number {
   let x = 0;
   let y = 0;
   for (const line of input) {
-    console.log(line);
     if (line.startsWith("forward ")) {
       x += parseInt(line.substr(8));
     } else if (line.startsWith("up ")) {
@@ -24,7 +31,6 @@ export function part2(input: string[]): number {
   let y = 0;
   let aim = 0;
   for (const line of input) {
-    console.log(line);
     if (line.startsWith("forward ")) {
       const arg = parseInt(line.substr(8));
       x += arg;
@@ -32,11 +38,9 @@ export function part2(input: string[]): number {
     } else if (line.startsWith("up ")) {
       const arg = parseInt(line.substr(3));
       aim -= arg;
-      // y -= arg;
     } else if (line.startsWith("down ")) {
       const arg = parseInt(line.substr(5));
       aim += arg;
-      // y += arg;
     }
   }
   return x * y;

2021/common.nim

@@ -0,0 +1,35 @@
+import std/[streams, sequtils, strutils, sugar, strformat, times, httpclient, os]
+
+const YEAR = getEnv("AOC_YEAR", "2021").parseInt()
+proc getCookie(): string = "~/.advent-of-code-auth-cookie".expandTilde().readFile()
+proc getCacheDir(): string = joinPath(expandTilde("~/.cache"), fmt"/aoc{YEAR}")
+proc inputFilePath(day: int): string = joinPath(getCacheDir(), fmt"{day}.input")
+
+proc fetchInput(day: int, filePath: string): StringStream =
+  let client = newHttpClient()
+  client.headers = {"cookie": getCookie()}.newHttpHeaders()
+  let content = client.getContent(fmt"https://adventofcode.com/{YEAR}/day/{day}/input")
+  filePath.writeFile(content)
+  content.newStringStream()
+
+proc inputStream*(day: int): Stream =
+  getCacheDir().createDir()
+  let cachedFile = day.inputFilePath()
+  if not cachedFile.fileExists(): day.fetchInput(cachedFile)
+  else: openFileStream(cachedFile)
+
+proc toInts*(s: seq[string]): seq[int] = s.map(parseInt)
+
+proc loadInput*(day: int): seq[string] =
+  result = collect:
+    for l in day.inputStream().lines(): l
+
+template time*(i: string, body: untyped): untyped =
+  let start = cpuTime()
+  body
+  let stop = cpuTime()
+  let diff = $((stop - start) * 1000)
+  echo i & " took " & diff & "ms to calculate solution"
+  when not defined(release):
+    echo "NOTE: This is not a real measurement of performance. Compile in release mode with -d:release for best performance."
+  # jkp: {(stop - start) * 1000} ms to calculate solution: {result}"

2021/one.nim

@@ -1,31 +1,15 @@
-import std/[streams, strutils, sugar, strformat, times]
+import ./common
 
-iterator inputForDay(day: int): int =
+proc countDepthIncreases(inputs: seq[int], dist=1): int  =
-  var stream: FileStream = fmt"/home/daniel/.home/.config/aoc2021/{day}.input".openFileStream
+  for i in dist..<inputs.len():
-  for s in stream.lines():
-    yield s.parseInt
-
-proc part1(inputs: seq[int], dist=1): int =
-  result = 0
-  var i = dist
-  var x = inputs.len()-1
-  while i <= x:
     if inputs[i] > inputs[i-dist]: inc result
-    inc i
 
-let dd1 = epochTime()
+let input = 1.loadInput().toInts()
-var input = collect(newSeq):
+time("countDepthIncreases part 1"): echo input.countDepthIncreases()
-  for i in inputForDay(1): i
+time("countDepthIncreases part 2"): echo input.countDepthIncreases(3)
 
-let dd2 = epochTime()
+when not defined(release):
-echo &"{(dd2 - dd1) * 1000} ms (to load input)"
+  static:
-echo "Part 1"
+    let testInputs = @[199, 200, 208, 210, 200, 207, 240, 269, 260, 263]
-let d1 = epochTime()
+    doAssert testInputs.countDepthIncreases() == 7
-echo part1(input)
+    doAssert testInputs.countDepthIncreases(3) == 5
-let d2 = epochTime()
-echo &"{(d2 - d1) * 1000} ms (to calculate solution)"
-echo "Part 2"
-let d21 = epochTime()
-echo part1(input,3)
-let d22 = epochTime()
-echo &"{(d22 - d21) * 1000} ms (to calculate solution)"

2021/readme.md

@@ -12,16 +12,34 @@ Specifically, here's my `deno --version` output:
 
 Enjoy!
 
+**EDIT**: Since performance is not what I would like, it looks like I'm also doing some of these in nim.
+
 ## Usage
 
 Run these solutions like so:
 
     deno run --unstable --allow-all $DAY.ts
 
+And the nim ones like so:
+
+    nim c -d:release -d:ssl --run $DAYMODULE.nim
+
+And if you want to measure memory usage:
+
+    mkdir -p build
+    deno compile --output build/$DAY --unstable --allow-all $DAY.ts
+    /usr/bin/time -v ./build/$DAY
+
+Or
+
+    mkdir -p build
+    nim c -d:release -d:ssl --outdir:build $DAYMODULE.nim
+    /usr/bin/time -v ./$DAYMODULE
+
 # Days
 
 - [x] [Day 1](./1.ts)
-- [ ] Day 2
+- [x] [Day 2](./2.ts)
 - [ ] Day 3
 - [ ] Day 4
 - [ ] Day 5

2021/two.nim

@@ -0,0 +1,53 @@
+import std/[strutils, sequtils]
+import ./common
+
+type SubmarineCommand = enum
+  Forward, Up, Down
+
+proc parseArg(c: char): int = c.int() - 48
+
+proc parseSubmarineCommand(l: string): (SubmarineCommand, int) =
+  case l[0]:
+    # since each arg is only one char, we can use this much faster method to
+    # convert to an integer
+    of 'd': return (Down, l[5].parseArg())
+    of 'u': return (Up, l[3].parseArg())
+    else: return (Forward, l[8].parseArg())
+
+proc submarineCommands(inputs: seq[string]): int =
+  var x, y = 0
+  for (cmd, arg) in inputs.map(parseSubmarineCommand):
+    case cmd:
+      of Up: y -= arg
+      of Down: y += arg
+      of Forward: x += arg
+  x * y
+
+proc submarineCommandsWithAim(inputs: seq[string]): int =
+  var x, y, aim = 0
+  for (cmd, arg) in inputs.map(parseSubmarineCommand):
+    case cmd:
+      of Up: aim -= arg
+      of Down: aim += arg
+      of Forward:
+        x += arg
+        y += aim * arg
+  x * y
+
+let input = 2.loadInput()
+time("submarineCommands part 1"): echo input.submarineCommands()
+time("submarineCommandsWithAim part 2"): echo input.submarineCommandsWithAim()
+
+when not defined(release):
+  static:
+    let testInput = @[
+      "forward 5",
+      "down 5",
+      "forward 8",
+      "up 3",
+      "down 8",
+      "forward 2",
+    ]
+    doAssert testInput.submarineCommands() == 150
+    doAssert testInput.submarineCommandsWithAim() == 900
+