lib/http: convert options to new style

There are still users of the old style options which haven't been
converted yet.

lib/http/template.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/spf13/pflag"
 
+	"github.com/rclone/rclone/fs"
 	"github.com/rclone/rclone/fs/config/flags"
 )
 
@@ -72,9 +73,16 @@ be used to render HTML based on specific conditions.
 	return buf.String()
 }
 
+// TemplateConfigInfo descripts the Options in use
+var TemplateConfigInfo = fs.Options{{
+	Name:    "template",
+	Default: "",
+	Help:    "User-specified template",
+}}
+
 // TemplateConfig for the templating functionality
 type TemplateConfig struct {
-	Path string
+	Path string `config:"template"`
 }
 
 // AddFlagsPrefix for the templating functionality
@@ -88,6 +96,9 @@ func AddTemplateFlagsPrefix(flagSet *pflag.FlagSet, prefix string, cfg *Template
 }
 
 // DefaultTemplateCfg returns a new config which can be customized by command line flags
+//
+// Note that this needs to be kept in sync with TemplateConfigInfo above and
+// can be removed when all callers have been converted.
 func DefaultTemplateCfg() TemplateConfig {
 	return TemplateConfig{}
 }