remove blockid from the regular args, use an optional -b (#973)

cmd/wsh/cmd/wshcmd-deleteblock.go

@@ -11,7 +11,6 @@ import (
 var deleteBlockCmd = &cobra.Command{
 	Use:     "deleteblock",
 	Short:   "delete a block",
-	Args:    cobra.ExactArgs(1),
 	Run:     deleteBlockRun,
 	PreRunE: preRunSetupRpcClient,
 }
@@ -21,11 +20,7 @@ func init() {
 }
 
 func deleteBlockRun(cmd *cobra.Command, args []string) {
-	oref := args[0]
+	oref := blockArg
-	if oref == "" {
-		WriteStderr("[error] oref is required\n")
-		return
-	}
 	err := validateEasyORef(oref)
 	if err != nil {
 		WriteStderr("[error]%v\n", err)

cmd/wsh/cmd/wshcmd-getmeta.go

@@ -12,9 +12,9 @@ import (
 )
 
 var getMetaCmd = &cobra.Command{
-	Use:     "getmeta {blockid|blocknum|this} [key]",
+	Use:     "getmeta [key]",
 	Short:   "get metadata for an entity",
-	Args:    cobra.RangeArgs(1, 2),
+	Args:    cobra.RangeArgs(0, 1),
 	Run:     getMetaRun,
 	PreRunE: preRunSetupRpcClient,
 }
@@ -24,7 +24,7 @@ func init() {
 }
 
 func getMetaRun(cmd *cobra.Command, args []string) {
-	oref := args[0]
+	oref := blockArg
 	if oref == "" {
 		WriteStderr("[error] oref is required")
 		return
@@ -44,8 +44,8 @@ func getMetaRun(cmd *cobra.Command, args []string) {
 		WriteStderr("[error] getting metadata: %v\n", err)
 		return
 	}
-	if len(args) > 1 {
+	if len(args) > 0 {
-		val, ok := resp[args[1]]
+		val, ok := resp[args[0]]
 		if !ok {
 			return
 		}

cmd/wsh/cmd/wshcmd-readfile.go

@@ -14,7 +14,7 @@ import (
 var readFileCmd = &cobra.Command{
 	Use:     "readfile",
 	Short:   "read a blockfile",
-	Args:    cobra.ExactArgs(2),
+	Args:    cobra.ExactArgs(1),
 	Run:     runReadFile,
 	PreRunE: preRunSetupRpcClient,
 }

cmd/wsh/cmd/wshcmd-root.go

@@ -35,6 +35,7 @@ var WrappedStdin io.Reader = os.Stdin
 var RpcClient *wshutil.WshRpc
 var RpcContext wshrpc.RpcContext
 var UsingTermWshMode bool
+var blockArg string
 
 func extraShutdownFn() {
 	if usingHtmlMode {
@@ -174,6 +175,7 @@ func Execute() {
 			wshutil.DoShutdown("", 0, false)
 		}
 	}()
+	rootCmd.PersistentFlags().StringVarP(&blockArg, "block", "b", "this", "for commands which require a block id")
 	err := rootCmd.Execute()
 	if err != nil {
 		wshutil.DoShutdown("", 1, true)

cmd/wsh/cmd/wshcmd-setmeta.go

@@ -16,7 +16,7 @@ import (
 var setMetaCmd = &cobra.Command{
 	Use:     "setmeta {blockid|blocknum|this} key=value ...",
 	Short:   "set metadata for an entity",
-	Args:    cobra.MinimumNArgs(2),
+	Args:    cobra.MinimumNArgs(1),
 	Run:     setMetaRun,
 	PreRunE: preRunSetupRpcClient,
 }
@@ -64,8 +64,8 @@ func parseMetaSets(metaSets []string) (map[string]interface{}, error) {
 }
 
 func setMetaRun(cmd *cobra.Command, args []string) {
-	oref := args[0]
+	oref := blockArg
-	metaSetsStrs := args[1:]
+	metaSetsStrs := args[:]
 	if oref == "" {
 		WriteStderr("[error] oref is required\n")
 		return