rclone: change "ls" and add "lsl" and "md5sum" commands

Changed "ls" command not to show modification time by default only
size and path.  That is because it is slow for nearly all the remotes
as it requires extra metadata lookup.  All remotes can look up files
and sizes without extra operations.

Added "lsl" which does what "ls" used to - namely show modification
time, size and path.

Added "md5sum" which produces the same output as the md5sum command -
md5sums and paths that is.

fs/operations.go

@@ -159,7 +159,7 @@ func checkOne(pair ObjectPair, out ObjectPairChan) {
 	out <- pair
 }
 
-// Read FsObjects~s on in send to out if they need uploading
+// Read Objects~s on in send to out if they need uploading
 //
 // FIXME potentially doing lots of MD5SUMS at once
 func PairChecker(in ObjectPairChan, out ObjectPairChan, wg *sync.WaitGroup) {
@@ -172,7 +172,7 @@ func PairChecker(in ObjectPairChan, out ObjectPairChan, wg *sync.WaitGroup) {
 	}
 }
 
-// Read FsObjects on in and copy them
+// Read Objects on in and copy them
 func Copier(in ObjectPairChan, fdst Fs, wg *sync.WaitGroup) {
 	defer wg.Done()
 	for pair := range in {
@@ -376,10 +376,10 @@ func Check(fdst, fsrc Fs) error {
 	return nil
 }
 
-// List the Fs to stdout
+// List the Fs to the supplied function
 //
 // Lists in parallel which may get them out of order
-func List(f Fs) error {
+func ListFn(f Fs, fn func(Object)) error {
 	in := f.List()
 	var wg sync.WaitGroup
 	wg.Add(Config.Checkers)
@@ -387,10 +387,7 @@ func List(f Fs) error {
 		go func() {
 			defer wg.Done()
 			for o := range in {
-				Stats.Checking(o)
-				modTime := o.ModTime()
-				Stats.DoneChecking(o)
-				fmt.Printf("%9d %19s %s\n", o.Size(), modTime.Format("2006-01-02 15:04:05.00000000"), o.Remote())
+				fn(o)
 			}
 		}()
 	}
@@ -398,6 +395,49 @@ func List(f Fs) error {
 	return nil
 }
 
+// List the Fs to stdout
+//
+// Shows size and path
+//
+// Lists in parallel which may get them out of order
+func List(f Fs) error {
+	return ListFn(f, func(o Object) {
+		fmt.Printf("%9d %s\n", o.Size(), o.Remote())
+	})
+}
+
+// List the Fs to stdout
+//
+// Shows size, mod time and path
+//
+// Lists in parallel which may get them out of order
+func ListLong(f Fs) error {
+	return ListFn(f, func(o Object) {
+		Stats.Checking(o)
+		modTime := o.ModTime()
+		Stats.DoneChecking(o)
+		fmt.Printf("%9d %19s %s\n", o.Size(), modTime.Format("2006-01-02 15:04:05.00000000"), o.Remote())
+	})
+}
+
+// List the Fs to stdout
+//
+// Produces the same output as the md5sum command
+//
+// Lists in parallel which may get them out of order
+func Md5sum(f Fs) error {
+	return ListFn(f, func(o Object) {
+		Stats.Checking(o)
+		md5sum, err := o.Md5sum()
+		Stats.DoneChecking(o)
+		if err != nil {
+			Debug(o, "Failed to read MD5: %v", err)
+			md5sum = "UNKNOWN"
+		}
+		fmt.Printf("%32s  %s\n", md5sum, o.Remote())
+	})
+}
+
 // List the directories/buckets/containers in the Fs to stdout
 func ListDir(f Fs) error {
 	for dir := range f.ListDir() {

rclone.go

@@ -92,7 +92,7 @@ var Commands = []Command{
 		Name:     "ls",
 		ArgsHelp: "[remote://path]",
 		Help: `
-        List all the objects in the the path.`,
+        List all the objects in the the path with size and path.`,
 		Run: func(fdst, fsrc fs.Fs) {
 			err := fs.List(fdst)
 			if err != nil {
@@ -116,6 +116,34 @@ var Commands = []Command{
 		MinArgs: 1,
 		MaxArgs: 1,
 	},
+	{
+		Name:     "lsl",
+		ArgsHelp: "[remote://path]",
+		Help: `
+        List all the objects in the the path with modification time, size and path.`,
+		Run: func(fdst, fsrc fs.Fs) {
+			err := fs.ListLong(fdst)
+			if err != nil {
+				log.Fatalf("Failed to list long: %v", err)
+			}
+		},
+		MinArgs: 1,
+		MaxArgs: 1,
+	},
+	{
+		Name:     "md5sum",
+		ArgsHelp: "[remote://path]",
+		Help: `
+        Produces an md5sum file for all the objects in the path.`,
+		Run: func(fdst, fsrc fs.Fs) {
+			err := fs.Md5sum(fdst)
+			if err != nil {
+				log.Fatalf("Failed to list: %v", err)
+			}
+		},
+		MinArgs: 1,
+		MaxArgs: 1,
+	},
 	{
 		Name:     "mkdir",
 		ArgsHelp: "remote://path",