chore: use XT_URI for seed

app.go

@@ -4,6 +4,8 @@ import (
 	"context"
 	"database/sql"
 	"fmt"
+	"io"
+	"net/http"
 	"os"
 	"runtime/debug"
 	"strconv"
@@ -68,13 +70,24 @@ func run(ctx context.Context, c *console.C[args]) error {
 		ctx, span := otel.Span(ctx)
 		defer span.End()
 
-		f, err := os.Open(a.baseFeed)
-		if err != nil {
-			return err
-		}
-		defer f.Close()
+		var inFile io.Reader
 
-		twtfile, err := lextwt.ParseFile(f, &types.Twter{
+		if a.baseFeed != "" {
+			f, err := os.Open(a.baseFeed)
+			if err != nil {
+				return err
+			}
+			defer f.Close()
+		} else {
+			res, err := http.Get(a.URI)
+			if err != nil {
+				return err
+			}
+			inFile = res.Body
+			defer res.Body.Close()
+		}
+
+		twtfile, err := lextwt.ParseFile(inFile, &types.Twter{
 			Nick: a.Nick,
 			URI:  a.URI,
 		})