3 files changed, 74 insertions, 27 deletions

diff --git a/2022/01/elfs.go b/2022/01/calories/elfs.go
index b13dbd3..2011fc8 100644
--- a/2022/01/elfs.go
+++ b/2022/01/calories/elfs.go
@@ -1,4 +1,35 @@
-package main
+package calories
+
+import (
+	"context"
+	"strconv"
+)
+
+type solver func(ctx context.Context, data []int) ([]int, error)
+
+var (
+	Reader  = readCaloriesInts
+	Solvers = []solver{partOne, partTwo}
+)
+
+func partOne(ctx context.Context, data []int) ([]int, error) {
+	return biggestElf(data), nil
+}
+
+func partTwo(ctx context.Context, data []int) ([]int, error) {
+	return []int{sum(biggestElf(data))}, nil
+}
+
+func readCaloriesInts(line string) (int, error) {
+	if len(line) == 0 {
+		return -1, nil
+	}
+	if i, err := strconv.Atoi(line); err != nil {
+		return 0, err
+	} else {
+		return i, nil
+	}
+}
 
 func biggestElf(data []int) []int {
 	topThree := make([]int, 3)
diff --git a/2022/01/main.go b/2022/01/main.go
index 3b8ac4c..51d5750 100644
--- a/2022/01/main.go
+++ b/2022/01/main.go
@@ -2,38 +2,18 @@ package main
 
 import (
 	"context"
-	"strconv"
 
+	"mvinkio.online/aoc/2022/01/calories"
 	"mvinkio.online/aoc/aoc"
 )
 
-func readCaloriesInts(line string) (int, error) {
-	if len(line) == 0 {
-		return -1, nil
-	}
-	if i, err := strconv.Atoi(line); err != nil {
-		return 0, err
-	} else {
-		return i, nil
-	}
-}
-
-func PartOne(ctx context.Context, data []int) ([]int, error) {
-	return biggestElf(data), nil
-}
-
-func PartTwo(ctx context.Context, data []int) ([]int, error) {
-	return []int{sum(biggestElf(data))}, nil
-}
-
 // Boilerplate
 
 func main() {
 	aoc.RunDay(
 		context.TODO(),
 		aoc.NewScanCloser("2022/01/input.txt"),
-		aoc.ReadByLine(readCaloriesInts),
-		PartOne,
-		PartTwo,
+		aoc.ReadByLine(calories.Reader),
+		calories.Solvers...,
 	)
 }
diff --git a/cmd/aocli/gen.go b/cmd/aocli/gen.go
index c8251a6..7320894 100644
--- a/cmd/aocli/gen.go
+++ b/cmd/aocli/gen.go
@@ -2,14 +2,50 @@ package main
 
 import (
 	"fmt"
+	"strconv"
+	"strings"
 
 	"github.com/spf13/cobra"
 )
 
+var templateStr string = `
+`
+
 var genCmd = &cobra.Command{
 	Use:   "gen",
-	Short: "Generate a new key pair",
-	Run: func(cmd *cobra.Command, args []string) {
-		fmt.Println(args)
+	Short: "Generate a new boilerplate entrypoint for a day of Advent of Code",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		year, day := "", ""
+		if len(args) == 1 {
+			parts := strings.SplitN(args[0], "/", 2)
+			if len(parts) == 2 {
+				year = parts[0]
+				day = parts[1]
+			}
+		} else {
+			return fmt.Errorf("Expected one argument in format %q", "<year>/<day>")
+		}
+
+		if year == "" || day == "" {
+			return fmt.Errorf("Expected one argument in format %q", "<year>/<day>")
+		}
+
+		_, err := strconv.Atoi(year)
+		if err != nil {
+			return fmt.Errorf("Couldn't parse year integer: %q", year)
+		}
+
+		dayInt, err := strconv.Atoi(day)
+		if err != nil {
+			return fmt.Errorf("Couldn't parse day integer: %q", day)
+		}
+
+		if dayInt < 1 || dayInt > 25 {
+			return fmt.Errorf("Day must be between 1 and 25, got %d", dayInt)
+		}
+
+		dayStr := fmt.Sprintf("%02d", dayInt)
+		fmt.Println(dayStr)
+		return nil
 	},
 }