feat: add day1 part 1 solution

cmd/aoc/main.go

@@ -8,6 +8,7 @@ import (
 	"path/filepath"
 	"regexp"
 
+	_ "advent-of-code/internal/2015/DayOne"
 	_ "advent-of-code/internal/2020/DayEight"
 	_ "advent-of-code/internal/2020/DayFour"
 	_ "advent-of-code/internal/2020/DayOne"

internal/2015/DayOne/code.go

@@ -0,0 +1,32 @@
+package dayone
+
+import (
+	"advent-of-code/internal/registry"
+	"os"
+)
+
+func init() {
+	registry.Register("2015D1", ParseInput, PartOne, PartTwo)
+}
+
+func ParseInput(filepath string) string {
+	content, _ := os.ReadFile(filepath)
+	return string(content)
+}
+
+func PartOne(data string) int {
+	floor := 0
+	for _, char := range data {
+		switch char {
+		case '(':
+			floor++
+		case ')':
+			floor--
+		}
+	}
+	return floor
+}
+
+func PartTwo(data string) int {
+	return 0
+}

internal/2015/DayOne/code_test.go

@@ -0,0 +1,30 @@
+package dayone
+
+import "testing"
+
+func TestPartOne(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    string
+		expected int
+	}{
+		{"(())", "(())", 0},
+		{"()()", "()()", 0},
+		{"(((", "(((", 3},
+		{"(()(()(", "(()(()(", 3},
+		{"))(((((", "))(((((", 3},
+		{"())", "())", -1},
+		{"))(", "))(", -1},
+		{")))", ")))", -3},
+		{")())())", ")())())", -3},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := PartOne(tt.input)
+			if got != tt.expected {
+				t.Errorf("PartOne(%q) = %d, want %d", tt.input, got, tt.expected)
+			}
+		})
+	}
+}