From cdc79643bea0a7687ae3699f203b2ecf9a969e74 Mon Sep 17 00:00:00 2001
From: Lennart ten Wolde <lenny.devmail@gmail.com>
Date: Sat, 17 Dec 2022 20:09:45 +0100
Subject: [PATCH] Day 4

---
 day_01/{day_01.nim => solve.nim} |    0
 day_02/{day_02.nim => solve.nim} |    0
 day_04/input.txt                 | 1000 ++++++++++++++++++++++++++++++
 day_04/solve.nim                 |   43 ++
 make_day.sh                      |    3 +-
 run_day.sh                       |    3 +
 template.nim                     |    2 +-
 7 files changed, 1049 insertions(+), 2 deletions(-)
 rename day_01/{day_01.nim => solve.nim} (100%)
 rename day_02/{day_02.nim => solve.nim} (100%)
 create mode 100644 day_04/input.txt
 create mode 100644 day_04/solve.nim
 create mode 100755 run_day.sh

diff --git a/day_01/day_01.nim b/day_01/solve.nim
similarity index 100%
rename from day_01/day_01.nim
rename to day_01/solve.nim
diff --git a/day_02/day_02.nim b/day_02/solve.nim
similarity index 100%
rename from day_02/day_02.nim
rename to day_02/solve.nim
diff --git a/day_04/input.txt b/day_04/input.txt
new file mode 100644
index 0000000..03e097b
--- /dev/null
+++ b/day_04/input.txt
@@ -0,0 +1,1000 @@
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+7-78,7-63
+7-96,3-8
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\ No newline at end of file
diff --git a/day_04/solve.nim b/day_04/solve.nim
new file mode 100644
index 0000000..7103951
--- /dev/null
+++ b/day_04/solve.nim
@@ -0,0 +1,43 @@
+import std/[strutils, sequtils, sugar]
+
+type Assignment = object
+  first: int
+  last: int
+
+proc assignment(sections: string): Assignment {.inline.} =
+  let edges = sections.split("-")
+  return Assignment(first: edges[0].parseInt, last: edges[1].parseInt)
+
+proc contains(self: Assignment, other: Assignment): bool {.inline.} =
+  other.first >= self.first and other.last <= self.last
+
+proc intersects(self: Assignment, other: Assignment): bool {.inline.} =
+  other.last >= self.first and other.first <= self.last
+
+const input = readFile("day_04/input.txt")
+
+iterator elfPairs(data: string): tuple[elf1: Assignment, elf2: Assignment] =
+  for pair in input.splitLines:
+    let assignments = pair.split(",")
+    yield (
+      elf1: assignment(assignments[0]), 
+      elf2: assignment(assignments[1])
+    )
+
+proc solvePart1() =
+  var count = 0
+  for pair in input.elfPairs:
+    if pair.elf1.contains(pair.elf2) or pair.elf2.contains(pair.elf1):
+      count += 1
+  echo "Fully incuded pairs: " & $count
+
+proc solvePart2() =
+  var count = 0
+  for pair in input.elfPairs:
+    if pair.elf1.intersects(pair.elf2):
+      count += 1
+  echo "Intersecting pairs: " & $count
+
+if isMainModule:
+  solvePart1()
+  solvePart2()
diff --git a/make_day.sh b/make_day.sh
index 382b853..52198bd 100755
--- a/make_day.sh
+++ b/make_day.sh
@@ -2,5 +2,6 @@
 
 echo "Making day_$1"
 mkdir day_$1
-cp template.nim day_$1
+cp template.nim day_$1/solve.nim
+sed -i "s/DAYNR/$1/g" day_$1/solve.nim
 touch day_$1/input.txt
diff --git a/run_day.sh b/run_day.sh
new file mode 100755
index 0000000..9faa1ee
--- /dev/null
+++ b/run_day.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+nim c -r day_$1/solve.nim
\ No newline at end of file
diff --git a/template.nim b/template.nim
index 74a0938..aeb454f 100644
--- a/template.nim
+++ b/template.nim
@@ -1,6 +1,6 @@
 import std/[]
 
-const input = readFile("input.txt")
+const input = readFile("day_DAYNR/input.txt")
 
 proc solvePart1() =
   echo "TODO"