etcdctl: fill out ArgsUsage fields for help

USAGE in help now names positional arguments (e.g., "member remove <memberID>"
instead of "member remove [arguments...]")

Fixes #4021

etcdctl/command/auth_commands.go

@@ -29,14 +29,16 @@ func NewAuthCommands() cli.Command {
 		Usage: "overall auth controls",
 		Subcommands: []cli.Command{
 			{
-				Name:   "enable",
-				Usage:  "enable auth access controls",
-				Action: actionAuthEnable,
+				Name:      "enable",
+				Usage:     "enable auth access controls",
+				ArgsUsage: " ",
+				Action:    actionAuthEnable,
 			},
 			{
-				Name:   "disable",
-				Usage:  "disable auth access controls",
-				Action: actionAuthDisable,
+				Name:      "disable",
+				Usage:     "disable auth access controls",
+				ArgsUsage: " ",
+				Action:    actionAuthDisable,
 			},
 		},
 	}

etcdctl/command/backup_command.go

@@ -32,8 +32,9 @@ import (
 
 func NewBackupCommand() cli.Command {
 	return cli.Command{
-		Name:  "backup",
-		Usage: "backup an etcd directory",
+		Name:      "backup",
+		Usage:     "backup an etcd directory",
+		ArgsUsage: " ",
 		Flags: []cli.Flag{
 			cli.StringFlag{Name: "data-dir", Value: "", Usage: "Path to the etcd data dir"},
 			cli.StringFlag{Name: "backup-dir", Value: "", Usage: "Path to the backup dir"},

etcdctl/command/cluster_health.go

@@ -30,8 +30,9 @@ import (
 
 func NewClusterHealthCommand() cli.Command {
 	return cli.Command{
-		Name:  "cluster-health",
-		Usage: "check the health of the etcd cluster",
+		Name:      "cluster-health",
+		Usage:     "check the health of the etcd cluster",
+		ArgsUsage: " ",
 		Flags: []cli.Flag{
 			cli.BoolFlag{Name: "forever", Usage: "forever check the health every 10 second until CTRL+C"},
 		},

etcdctl/command/exec_watch_command.go

@@ -30,8 +30,9 @@ import (
 // NewExecWatchCommand returns the CLI command for "exec-watch".
 func NewExecWatchCommand() cli.Command {
 	return cli.Command{
-		Name:  "exec-watch",
-		Usage: "watch a key for changes and exec an executable",
+		Name:      "exec-watch",
+		Usage:     "watch a key for changes and exec an executable",
+		ArgsUsage: "<key> <command> [args...]",
 		Flags: []cli.Flag{
 			cli.IntFlag{Name: "after-index", Value: 0, Usage: "watch after the given index"},
 			cli.BoolFlag{Name: "recursive", Usage: "watch all values for key and child keys"},

etcdctl/command/get_command.go

@@ -26,8 +26,9 @@ import (
 // NewGetCommand returns the CLI command for "get".
 func NewGetCommand() cli.Command {
 	return cli.Command{
-		Name:  "get",
-		Usage: "retrieve the value of a key",
+		Name:      "get",
+		Usage:     "retrieve the value of a key",
+		ArgsUsage: "<key>",
 		Flags: []cli.Flag{
 			cli.BoolFlag{Name: "sort", Usage: "returns result in sorted order"},
 			cli.BoolFlag{Name: "quorum", Usage: "require quorum for get request"},

etcdctl/command/import_snap_command.go

@@ -36,8 +36,9 @@ type set struct {
 
 func NewImportSnapCommand() cli.Command {
 	return cli.Command{
-		Name:  "import",
-		Usage: "import a snapshot to a cluster",
+		Name:      "import",
+		Usage:     "import a snapshot to a cluster",
+		ArgsUsage: " ",
 		Flags: []cli.Flag{
 			cli.StringFlag{Name: "snap", Value: "", Usage: "Path to the valid etcd 0.4.x snapshot."},
 			cli.StringSliceFlag{Name: "hidden", Value: new(cli.StringSlice), Usage: "Hidden key spaces to import from snapshot"},

etcdctl/command/ls_command.go

@@ -23,8 +23,9 @@ import (
 
 func NewLsCommand() cli.Command {
 	return cli.Command{
-		Name:  "ls",
-		Usage: "retrieve a directory",
+		Name:      "ls",
+		Usage:     "retrieve a directory",
+		ArgsUsage: "[key]",
 		Flags: []cli.Flag{
 			cli.BoolFlag{Name: "sort", Usage: "returns result in sorted order"},
 			cli.BoolFlag{Name: "recursive", Usage: "returns all key names recursively for the given path"},

etcdctl/command/member_commands.go

@@ -28,24 +28,28 @@ func NewMemberCommand() cli.Command {
 		Usage: "member add, remove and list subcommands",
 		Subcommands: []cli.Command{
 			{
-				Name:   "list",
-				Usage:  "enumerate existing cluster members",
-				Action: actionMemberList,
+				Name:      "list",
+				Usage:     "enumerate existing cluster members",
+				ArgsUsage: " ",
+				Action:    actionMemberList,
 			},
 			{
-				Name:   "add",
-				Usage:  "add a new member to the etcd cluster",
-				Action: actionMemberAdd,
+				Name:      "add",
+				Usage:     "add a new member to the etcd cluster",
+				ArgsUsage: "<name> <peerURL>",
+				Action:    actionMemberAdd,
 			},
 			{
-				Name:   "remove",
-				Usage:  "remove an existing member from the etcd cluster",
-				Action: actionMemberRemove,
+				Name:      "remove",
+				Usage:     "remove an existing member from the etcd cluster",
+				ArgsUsage: "<memberID>",
+				Action:    actionMemberRemove,
 			},
 			{
-				Name:   "update",
-				Usage:  "update an existing member in the etcd cluster",
-				Action: actionMemberUpdate,
+				Name:      "update",
+				Usage:     "update an existing member in the etcd cluster",
+				ArgsUsage: "<memberID> <peerURLs>",
+				Action:    actionMemberUpdate,
 			},
 		},
 	}

etcdctl/command/mk_command.go

@@ -26,8 +26,9 @@ import (
 // NewMakeCommand returns the CLI command for "mk".
 func NewMakeCommand() cli.Command {
 	return cli.Command{
-		Name:  "mk",
-		Usage: "make a new key with a given value",
+		Name:      "mk",
+		Usage:     "make a new key with a given value",
+		ArgsUsage: "<key> <value>",
 		Flags: []cli.Flag{
 			cli.IntFlag{Name: "ttl", Value: 0, Usage: "key time-to-live"},
 		},

etcdctl/command/mkdir_command.go

@@ -25,8 +25,9 @@ import (
 // NewMakeDirCommand returns the CLI command for "mkdir".
 func NewMakeDirCommand() cli.Command {
 	return cli.Command{
-		Name:  "mkdir",
-		Usage: "make a new directory",
+		Name:      "mkdir",
+		Usage:     "make a new directory",
+		ArgsUsage: "<key>",
 		Flags: []cli.Flag{
 			cli.IntFlag{Name: "ttl", Value: 0, Usage: "key time-to-live"},
 		},

etcdctl/command/rm_command.go

@@ -24,8 +24,9 @@ import (
 // NewRemoveCommand returns the CLI command for "rm".
 func NewRemoveCommand() cli.Command {
 	return cli.Command{
-		Name:  "rm",
-		Usage: "remove a key or a directory",
+		Name:      "rm",
+		Usage:     "remove a key or a directory",
+		ArgsUsage: "<key>",
 		Flags: []cli.Flag{
 			cli.BoolFlag{Name: "dir", Usage: "removes the key if it is an empty directory or a key-value pair"},
 			cli.BoolFlag{Name: "recursive", Usage: "removes the key and all child keys(if it is a directory)"},

etcdctl/command/rmdir_command.go

@@ -24,8 +24,9 @@ import (
 // NewRemoveCommand returns the CLI command for "rmdir".
 func NewRemoveDirCommand() cli.Command {
 	return cli.Command{
-		Name:  "rmdir",
-		Usage: "removes the key if it is an empty directory or a key-value pair",
+		Name:      "rmdir",
+		Usage:     "removes the key if it is an empty directory or a key-value pair",
+		ArgsUsage: "<key>",
 		Action: func(c *cli.Context) {
 			rmdirCommandFunc(c, mustNewKeyAPI(c))
 		},

etcdctl/command/role_commands.go

@@ -31,28 +31,33 @@ func NewRoleCommands() cli.Command {
 		Usage: "role add, grant and revoke subcommands",
 		Subcommands: []cli.Command{
 			{
-				Name:   "add",
-				Usage:  "add a new role for the etcd cluster",
-				Action: actionRoleAdd,
+				Name:      "add",
+				Usage:     "add a new role for the etcd cluster",
+				ArgsUsage: "<role> ",
+				Action:    actionRoleAdd,
 			},
 			{
-				Name:   "get",
-				Usage:  "get details for a role",
-				Action: actionRoleGet,
+				Name:      "get",
+				Usage:     "get details for a role",
+				ArgsUsage: "<role>",
+				Action:    actionRoleGet,
 			},
 			{
-				Name:   "list",
-				Usage:  "list all roles",
-				Action: actionRoleList,
+				Name:      "list",
+				Usage:     "list all roles",
+				ArgsUsage: " ",
+				Action:    actionRoleList,
 			},
 			{
-				Name:   "remove",
-				Usage:  "remove a role from the etcd cluster",
-				Action: actionRoleRemove,
+				Name:      "remove",
+				Usage:     "remove a role from the etcd cluster",
+				ArgsUsage: "<role>",
+				Action:    actionRoleRemove,
 			},
 			{
-				Name:  "grant",
-				Usage: "grant path matches to an etcd role",
+				Name:      "grant",
+				Usage:     "grant path matches to an etcd role",
+				ArgsUsage: "<role>",
 				Flags: []cli.Flag{
 					cli.StringFlag{Name: "path", Value: "", Usage: "Path granted for the role to access"},
 					cli.BoolFlag{Name: "read", Usage: "Grant read-only access"},
@@ -62,8 +67,9 @@ func NewRoleCommands() cli.Command {
 				Action: actionRoleGrant,
 			},
 			{
-				Name:  "revoke",
-				Usage: "revoke path matches for an etcd role",
+				Name:      "revoke",
+				Usage:     "revoke path matches for an etcd role",
+				ArgsUsage: "<role>",
 				Flags: []cli.Flag{
 					cli.StringFlag{Name: "path", Value: "", Usage: "Path revoked for the role to access"},
 					cli.BoolFlag{Name: "read", Usage: "Revoke read access"},

etcdctl/command/set_command.go

@@ -26,8 +26,9 @@ import (
 // NewSetCommand returns the CLI command for "set".
 func NewSetCommand() cli.Command {
 	return cli.Command{
-		Name:  "set",
-		Usage: "set the value of a key",
+		Name:      "set",
+		Usage:     "set the value of a key",
+		ArgsUsage: "<key> <value>",
 		Flags: []cli.Flag{
 			cli.IntFlag{Name: "ttl", Value: 0, Usage: "key time-to-live"},
 			cli.StringFlag{Name: "swap-with-value", Value: "", Usage: "previous value"},

etcdctl/command/set_dir_command.go

@@ -22,8 +22,9 @@ import (
 // NewSetDirCommand returns the CLI command for "setDir".
 func NewSetDirCommand() cli.Command {
 	return cli.Command{
-		Name:  "setdir",
-		Usage: "create a new or existing directory",
+		Name:      "setdir",
+		Usage:     "create a new or existing directory",
+		ArgsUsage: "<key>",
 		Flags: []cli.Flag{
 			cli.IntFlag{Name: "ttl", Value: 0, Usage: "key time-to-live"},
 		},

etcdctl/command/update_command.go

@@ -26,8 +26,9 @@ import (
 // NewUpdateCommand returns the CLI command for "update".
 func NewUpdateCommand() cli.Command {
 	return cli.Command{
-		Name:  "update",
-		Usage: "update an existing key with a given value",
+		Name:      "update",
+		Usage:     "update an existing key with a given value",
+		ArgsUsage: "<key> <value>",
 		Flags: []cli.Flag{
 			cli.IntFlag{Name: "ttl", Value: 0, Usage: "key time-to-live"},
 		},

etcdctl/command/update_dir_command.go

@@ -26,8 +26,9 @@ import (
 // NewUpdateDirCommand returns the CLI command for "updatedir".
 func NewUpdateDirCommand() cli.Command {
 	return cli.Command{
-		Name:  "updatedir",
-		Usage: "update an existing directory",
+		Name:      "updatedir",
+		Usage:     "update an existing directory",
+		ArgsUsage: "<key> <value>",
 		Flags: []cli.Flag{
 			cli.IntFlag{Name: "ttl", Value: 0, Usage: "key time-to-live"},
 		},

etcdctl/command/user_commands.go

@@ -32,41 +32,48 @@ func NewUserCommands() cli.Command {
 		Usage: "user add, grant and revoke subcommands",
 		Subcommands: []cli.Command{
 			{
-				Name:   "add",
-				Usage:  "add a new user for the etcd cluster",
-				Action: actionUserAdd,
+				Name:      "add",
+				Usage:     "add a new user for the etcd cluster",
+				ArgsUsage: "<user>",
+				Action:    actionUserAdd,
 			},
 			{
-				Name:   "get",
-				Usage:  "get details for a user",
-				Action: actionUserGet,
+				Name:      "get",
+				Usage:     "get details for a user",
+				ArgsUsage: "<user>",
+				Action:    actionUserGet,
 			},
 			{
-				Name:   "list",
-				Usage:  "list all current users",
-				Action: actionUserList,
+				Name:      "list",
+				Usage:     "list all current users",
+				ArgsUsage: "<user>",
+				Action:    actionUserList,
 			},
 			{
-				Name:   "remove",
-				Usage:  "remove a user for the etcd cluster",
-				Action: actionUserRemove,
+				Name:      "remove",
+				Usage:     "remove a user for the etcd cluster",
+				ArgsUsage: "<user>",
+				Action:    actionUserRemove,
 			},
 			{
-				Name:   "grant",
-				Usage:  "grant roles to an etcd user",
-				Flags:  []cli.Flag{cli.StringSliceFlag{Name: "roles", Value: new(cli.StringSlice), Usage: "List of roles to grant or revoke"}},
-				Action: actionUserGrant,
+				Name:      "grant",
+				Usage:     "grant roles to an etcd user",
+				ArgsUsage: "<user>",
+				Flags:     []cli.Flag{cli.StringSliceFlag{Name: "roles", Value: new(cli.StringSlice), Usage: "List of roles to grant or revoke"}},
+				Action:    actionUserGrant,
 			},
 			{
-				Name:   "revoke",
-				Usage:  "revoke roles for an etcd user",
-				Flags:  []cli.Flag{cli.StringSliceFlag{Name: "roles", Value: new(cli.StringSlice), Usage: "List of roles to grant or revoke"}},
-				Action: actionUserRevoke,
+				Name:      "revoke",
+				Usage:     "revoke roles for an etcd user",
+				ArgsUsage: "<user>",
+				Flags:     []cli.Flag{cli.StringSliceFlag{Name: "roles", Value: new(cli.StringSlice), Usage: "List of roles to grant or revoke"}},
+				Action:    actionUserRevoke,
 			},
 			{
-				Name:   "passwd",
-				Usage:  "change password for a user",
-				Action: actionUserPasswd,
+				Name:      "passwd",
+				Usage:     "change password for a user",
+				ArgsUsage: "<user>",
+				Action:    actionUserPasswd,
 			},
 		},
 	}

etcdctl/command/watch_command.go

@@ -28,8 +28,9 @@ import (
 // NewWatchCommand returns the CLI command for "watch".
 func NewWatchCommand() cli.Command {
 	return cli.Command{
-		Name:  "watch",
-		Usage: "watch a key for changes",
+		Name:      "watch",
+		Usage:     "watch a key for changes",
+		ArgsUsage: "<key>",
 		Flags: []cli.Flag{
 			cli.BoolFlag{Name: "forever", Usage: "forever watch a key until CTRL+C"},
 			cli.IntFlag{Name: "after-index", Value: 0, Usage: "watch after the given index"},