Fix root command without subcommands but with arguments

cobra_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"fmt"
 	"os"
+	"reflect"
 	"runtime"
 	"strings"
 	"testing"
@@ -12,7 +13,7 @@ import (
 var _ = fmt.Println
 var _ = os.Stderr
 
-var tp, te, tt, t1 []string
+var tp, te, tt, t1, tr []string
 var rootPersPre, echoPre, echoPersPre, timesPersPre []string
 var flagb1, flagb2, flagb3, flagbr, flagbp bool
 var flags1, flags2a, flags2b, flags3 string
@@ -99,6 +100,7 @@ var cmdRootWithRun = &Command{
 	Short: "The root can run it's own function",
 	Long:  "The root description for help",
 	Run: func(cmd *Command, args []string) {
+		tr = args
 		rootcalled = true
 	},
 }
@@ -181,7 +183,7 @@ func initializeWithSameName() *Command {
 
 func initializeWithRootCmd() *Command {
 	cmdRootWithRun.ResetCommands()
-	tt, tp, te, rootcalled = nil, nil, nil, false
+	tt, tp, te, tr, rootcalled = nil, nil, nil, nil, false
 	flagInit()
 	cmdRootWithRun.Flags().BoolVarP(&flagbr, "boolroot", "b", false, "help message for flag boolroot")
 	cmdRootWithRun.Flags().IntVarP(&flagir, "introot", "i", 321, "help message for flag introot")
@@ -494,7 +496,7 @@ func TestTrailingCommandFlags(t *testing.T) {
 	}
 }
 
-func TestInvalidSubCommandFlags(t *testing.T) {
+func TestInvalidSubcommandFlags(t *testing.T) {
 	cmd := initializeWithRootCmd()
 	cmd.AddCommand(cmdTimes)
 
@@ -508,7 +510,7 @@ func TestInvalidSubCommandFlags(t *testing.T) {
 
 }
 
-func TestSubCommandArgEvaluation(t *testing.T) {
+func TestSubcommandArgEvaluation(t *testing.T) {
 	cmd := initializeWithRootCmd()
 
 	first := &Command{
@@ -819,6 +821,31 @@ func TestRemoveCommand(t *testing.T) {
 	}
 }
 
+func TestCommandWithoutSubcommands(t *testing.T) {
+	c := initializeWithRootCmd()
+
+	x := simpleTester(c, "")
+	if x.Error != nil {
+		t.Errorf("Calling command without subcommands should not have error: %v", x.Error)
+		return
+	}
+}
+
+func TestCommandWithoutSubcommandsWithArg(t *testing.T) {
+	c := initializeWithRootCmd()
+	expectedArgs := []string{"arg"}
+
+	x := simpleTester(c, "arg")
+	if x.Error != nil {
+		t.Errorf("Calling command without subcommands but with arg should not have error: %v", x.Error)
+		return
+	}
+	if !reflect.DeepEqual(expectedArgs, tr) {
+		t.Errorf("Calling command without subcommands but with arg has wrong args: expected: %v, actual: %v", expectedArgs, tr)
+		return
+	}
+}
+
 func TestReplaceCommandWithRemove(t *testing.T) {
 	versionUsed = 0
 	c := initializeWithRootCmd()

command.go

@@ -18,13 +18,14 @@ package cobra
 import (
 	"bytes"
 	"fmt"
-	"github.com/inconshreveable/mousetrap"
-	flag "github.com/spf13/pflag"
 	"io"
 	"os"
 	"runtime"
 	"strings"
 	"time"
+
+	"github.com/inconshreveable/mousetrap"
+	flag "github.com/spf13/pflag"
 )
 
 // Command is just that, a command for your application.
@@ -360,25 +361,28 @@ func argsMinusFirstX(args []string, x string) []string {
 
 // find the target command given the args and command tree
 // Meant to be run on the highest node. Only searches down.
-func (c *Command) Find(arrs []string) (*Command, []string, error) {
+func (c *Command) Find(args []string) (*Command, []string, error) {
 	if c == nil {
 		return nil, nil, fmt.Errorf("Called find() on a nil Command")
 	}
 
-	if len(arrs) == 0 {
-		return c.Root(), arrs, nil
+	// If there are no arguments, return the root command. If the root has no
+	// subcommands, args reflects arguments that should actually be passed to
+	// the root command, so also return the root command.
+	if len(args) == 0 || !c.Root().HasSubCommands() {
+		return c.Root(), args, nil
 	}
 
 	var innerfind func(*Command, []string) (*Command, []string)
 
-	innerfind = func(c *Command, args []string) (*Command, []string) {
-		if len(args) > 0 && c.HasSubCommands() {
-			argsWOflags := stripFlags(args, c)
+	innerfind = func(c *Command, innerArgs []string) (*Command, []string) {
+		if len(innerArgs) > 0 && c.HasSubCommands() {
+			argsWOflags := stripFlags(innerArgs, c)
 			if len(argsWOflags) > 0 {
 				matches := make([]*Command, 0)
 				for _, cmd := range c.commands {
 					if cmd.Name() == argsWOflags[0] || cmd.HasAlias(argsWOflags[0]) { // exact name or alias match
-						return innerfind(cmd, argsMinusFirstX(args, argsWOflags[0]))
+						return innerfind(cmd, argsMinusFirstX(innerArgs, argsWOflags[0]))
 					} else if EnablePrefixMatching {
 						if strings.HasPrefix(cmd.Name(), argsWOflags[0]) { // prefix match
 							matches = append(matches, cmd)
@@ -393,18 +397,18 @@ func (c *Command) Find(arrs []string) (*Command, []string, error) {
 
 				// only accept a single prefix match - multiple matches would be ambiguous
 				if len(matches) == 1 {
-					return innerfind(matches[0], argsMinusFirstX(args, argsWOflags[0]))
+					return innerfind(matches[0], argsMinusFirstX(innerArgs, argsWOflags[0]))
 				}
 			}
 		}
 
-		return c, args
+		return c, innerArgs
 	}
 
-	commandFound, a := innerfind(c, arrs)
+	commandFound, a := innerfind(c, args)
 
 	// If we matched on the root, but we asked for a subcommand, return an error
-	if commandFound.Name() == c.Name() && len(stripFlags(arrs, c)) > 0 && commandFound.Name() != arrs[0] {
+	if commandFound.Name() == c.Name() && len(stripFlags(args, c)) > 0 && commandFound.Name() != args[0] {
 		return nil, a, fmt.Errorf("unknown command %q", a[0])
 	}