Transfer command refactoring

Make transfer command processing even more modular

internal/cli/common.go

@@ -0,0 +1,44 @@
+/*
+Copyright © 2023 Philipp Wolfer <phw@uploadedlobster.com>
+
+Scotty is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software
+Foundation, either version 3 of the License, or (at your option) any later version.
+
+Scotty is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+Scotty. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+package cli
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+)
+
+func GetConfigFromFlag(cmd *cobra.Command, flagName string) (string, *viper.Viper) {
+	configName := cmd.Flag(flagName).Value.String()
+	var config *viper.Viper
+	servicesConfig := viper.Sub("service")
+	if servicesConfig != nil {
+		config = servicesConfig.Sub(configName)
+	}
+	if config == nil {
+		cobra.CheckErr(fmt.Sprintf("Invalid source configuration \"%s\"", configName))
+	}
+	return configName, config
+}
+
+func getInt64FromFlag(cmd *cobra.Command, flagName string) (result int64) {
+	result, err := cmd.Flags().GetInt64(flagName)
+	if err != nil {
+		result = 0
+	}
+	return
+}