feat: export command

internal/application/application.go

@@ -2,7 +2,9 @@ package application
 
 import (
 	"context"
+	"github.com/abelith/spellbook/internal/adapters/exporter"
 	"github.com/abelith/spellbook/internal/models"
+	"io"
 )
 
 type SpellCaster interface {
@@ -70,3 +72,24 @@ func (a *Application) CastSpell(
 ) (models.CastResult, error) {
 	return a.caster.Cast(ctx, spellCast)
 }
+
+func (a *Application) ExportSpells(
+	ctx context.Context,
+	name string,
+	w io.Writer,
+) error {
+	ch, errCh, err := a.spellQuery.Export(ctx)
+	if err != nil {
+		return err
+	}
+
+	if err := exporter.Export(ctx, name, ch, w); err != nil {
+		return err
+	}
+
+	if err := <-errCh; err != nil {
+		return err
+	}
+
+	return nil
+}