cli can pass -db /path/to/sql.db

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"os"
 	"os/signal"
 	"show-rss/src/cmd"
 	"syscall"
@@ -17,7 +18,7 @@ func Main(ctx context.Context) error {
 	ctx, can := signal.NotifyContext(ctx, syscall.SIGINT)
 	defer can()
 
-	if err := cmd.Main(ctx); err != nil && ctx.Err() == nil {
+	if err := cmd.Main(ctx, os.Args[1:]); err != nil && ctx.Err() == nil {
 		return err
 	}
 

main_test.go

@@ -2,6 +2,8 @@ package main_test
 
 import (
 	"context"
+	"os"
+	"path"
 	main "show-rss"
 	"show-rss/src/db"
 	"testing"
@@ -12,6 +14,8 @@ func TestMain(t *testing.T) {
 	ctx, can := context.WithTimeout(context.Background(), 2*time.Second)
 	defer can()
 
+	os.Args = []string{os.Args[0], "-db", path.Join(t.TempDir(), "db.db")}
+
 	if err := main.Main(db.Test(t, ctx)); err != nil && ctx.Err() == nil {
 		t.Fatal(err)
 	}

src/cmd/config.go

@@ -2,12 +2,33 @@ package cmd
 
 import (
 	"context"
+	"flag"
+	"os"
 	"show-rss/src/cleanup"
 	"show-rss/src/db"
 )
 
-func Config(ctx context.Context) (context.Context, func(), error) {
-	ctx, err := db.Inject(ctx, "/tmp/f.db")
+type Flags struct {
+	DB string
+}
+
+func NewFlags(args []string) (Flags, error) {
+	var result Flags
+
+	fs := flag.NewFlagSet(os.Args[0], flag.ContinueOnError)
+	fs.StringVar(&result.DB, "db", "/tmp/f.db", "path to sqlite.db")
+	err := fs.Parse(args)
+
+	return result, err
+}
+
+func Config(ctx context.Context, args []string) (context.Context, func(), error) {
+	flags, err := NewFlags(args)
+	if err != nil {
+		return ctx, nil, err
+	}
+
+	ctx, err = db.Inject(ctx, flags.DB)
 	if err != nil {
 		return ctx, nil, err
 	}

src/cmd/main.go

@@ -10,11 +10,11 @@ import (
 	"time"
 )
 
-func Main(ctx context.Context) error {
+func Main(ctx context.Context, args []string) error {
 	ctx, can := context.WithCancel(ctx)
 	defer can()
 
-	ctx, can, err := Config(ctx)
+	ctx, can, err := Config(ctx, args)
 	if err != nil {
 		return fmt.Errorf("failed to inject: %w", err)
 	}