fs: Implement RegInfo.FileName to return the on disk filename for a backend

Use it in make_backend_docs.py

bin/make_backend_docs.py

@@ -10,19 +10,12 @@ marker = "<!--- autogenerated options"
 start = marker + " start"
 stop = marker + " stop"
 
-# directory name to backend name
-dir_to_backend = {
-    "googlecloudstorage": "google cloud storage",
-    "amazonclouddrive": "amazon cloud drive",
-}
-
 def find_backends():
     """Return a list of all backends"""
     return [ x for x in os.listdir("backend") if x not in ("all",) ]
 
 def output_docs(backend, out):
     """Output documentation for backend options to out"""
-    backend = dir_to_backend.get(backend, backend)
     out.flush()
     subprocess.check_call(["rclone", "help", "backend", backend], stdout=out)
 

fs/fs.go

@@ -83,6 +83,11 @@ type RegInfo struct {
 	Options Options
 }
 
+// FileName returns the on disk file name for this backend
+func (ri *RegInfo) FileName() string {
+	return strings.Replace(ri.Name, " ", "", -1)
+}
+
 // Options is a slice of configuration Option for a backend
 type Options []Option
 
@@ -871,7 +876,7 @@ type ObjectPair struct {
 // Services are looked up in the config file
 func Find(name string) (*RegInfo, error) {
 	for _, item := range Registry {
-		if item.Name == name || item.Prefix == name {
+		if item.Name == name || item.Prefix == name || item.FileName() == name {
 			return item, nil
 		}
 	}