From 0416db0542c7e09b079e3b4cd56091d2b060eee8 Mon Sep 17 00:00:00 2001
From: Felix Van der Jeugt <felix.vanderjeugt@posteo.net>
Date: Wed, 8 Dec 2021 08:37:36 +0100
Subject: [PATCH] day 8 part 1

---
 day08/part1.lua | 21 +++++++++++++++++++++
 utils.lua       | 15 +++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100755 day08/part1.lua

diff --git a/day08/part1.lua b/day08/part1.lua
new file mode 100755
index 0000000..e232ba3
--- /dev/null
+++ b/day08/part1.lua
@@ -0,0 +1,21 @@
+#!/usr/bin/env luajit
+require("utils")
+
+function isunique(v)
+	return #v == 2 or #v == 3 or #v == 4 or #v == 7
+end
+
+local entries = {}
+local uniques = 0
+for line in io.lines(arg[3]) do
+	local words = split(line, " ")
+	local patterns = { unpack(words, 1, 10) }
+	local values = { unpack(words, 12, #words) }
+	table.insert(entries, {
+		patterns = patterns,
+		values = values,
+	})
+	uniques = uniques + count(values, isunique)
+end
+
+print(uniques)
diff --git a/utils.lua b/utils.lua
index 4e32290..9dae1cb 100644
--- a/utils.lua
+++ b/utils.lua
@@ -23,3 +23,18 @@ function foreach(t, f)
 		t[k] = f(v)
 	end
 end
+
+function printtable(t)
+	for k, v in pairs(t) do
+		io.write(k..":"..v.." ")
+	end
+	io.write("\n")
+end
+
+function count(t, pred)
+	local count = 0
+	for k, v in pairs(t) do
+		if pred(v) then count = count + 1 end
+	end
+	return count
+end