commands: Fix the config command

It now also accepts the `-s` (source) flag.

See #4598

commands/commands_test.go

@@ -51,6 +51,7 @@ func TestCommands(t *testing.T) {
 		// no args = hugo build
 		{nil, []string{sourceFlag}, ""},
 		{nil, []string{sourceFlag, "--renderToMemory"}, ""},
+		{[]string{"config"}, []string{sourceFlag}, ""},
 		{[]string{"benchmark"}, []string{sourceFlag, "-n=1"}, ""},
 		{[]string{"convert", "toTOML"}, []string{sourceFlag, "-o=" + filepath.Join(dirOut, "toml")}, ""},
 		{[]string{"convert", "toYAML"}, []string{sourceFlag, "-o=" + filepath.Join(dirOut, "yaml")}, ""},

commands/config.go

@@ -25,6 +25,7 @@ import (
 var _ cmder = (*configCmd)(nil)
 
 type configCmd struct {
+	hugoBuilderCommon
 	*baseCmd
 }
 
@@ -37,11 +38,13 @@ func newConfigCmd() *configCmd {
 		RunE:  cc.printConfig,
 	})
 
+	cc.cmd.Flags().StringVarP(&cc.source, "source", "s", "", "filesystem path to read files relative from")
+
 	return cc
 }
 
 func (c *configCmd) printConfig(cmd *cobra.Command, args []string) error {
-	cfg, err := initializeConfig(false, nil, c, nil)
+	cfg, err := initializeConfig(false, &c.hugoBuilderCommon, c, nil)
 
 	if err != nil {
 		return err