wip: implement business logic (rough draft)

There are a ton of visual warts, but the actual logic seems sound so
far.

1 files changed, 36 insertions, 3 deletions

diff --git a/main.go b/main.go
index 355ac01..85bfa26 100644
--- a/main.go
+++ b/main.go
@@ -8,9 +8,42 @@ import (
 	"strings"
 
 	"github.com/urfave/cli/v3"
+	"go.etcd.io/bbolt"
 )
 
+type controller struct {
+	db              *bbolt.DB
+	tasksBucketName []byte
+}
+
+func newController(filename string) (controller, error) {
+	db, err := bbolt.Open(filename, 0644, nil)
+	if err != nil {
+		return controller{}, fmt.Errorf("can't open database file '%s': %w", filename, err)
+	}
+
+	tasksBucketName := []byte("tasks")
+
+	// Create the tasks bucket for the first time. From here on,
+	// all transactions can assume this bucket exists.
+	db.Update(func(tx *bbolt.Tx) error {
+		_, err := tx.CreateBucket(tasksBucketName)
+		if err != nil {
+			return fmt.Errorf("cant' create tasks bucket: %w", err)
+		}
+
+		return nil
+	})
+
+	return controller{db, tasksBucketName}, nil
+}
+
 func main() {
+	ctrl, err := newController("tasks.db")
+	if err != nil {
+		log.Fatal(err)
+	}
+
 	cmd := &cli.Command{
 		Commands: []*cli.Command{
 			{
@@ -21,7 +54,7 @@ func main() {
 					args := cmd.Args().Slice()
 					task := strings.Join(args, " ")
 
-					return cmdAdd(task)
+					return ctrl.cmdAdd(task)
 				},
 			},
 			{
@@ -45,7 +78,7 @@ func main() {
 						return fmt.Errorf("invalid 'do' argument: %d", taskIndex)
 					}
 
-					return cmdDo(taskIndex)
+					return ctrl.cmdDo(taskIndex)
 				},
 			},
 			{
@@ -53,7 +86,7 @@ func main() {
 				Aliases: []string{"l"},
 				Usage:   "list pending tasks",
 				Action: func(ctx context.Context, cmd *cli.Command) error {
-					return cmdList()
+					return ctrl.cmdList()
 				},
 			},
 		},