Expose ValidateRequiredFlags and ValidateFlagGroups (#1760)

Author: jinlohwu

command.go

@@ -862,10 +862,10 @@ func (c *Command) execute(a []string) (err error) {
 		c.PreRun(c, argWoFlags)
 	}
 
-	if err := c.validateRequiredFlags(); err != nil {
+	if err := c.ValidateRequiredFlags(); err != nil {
 		return err
 	}
-	if err := c.validateFlagGroups(); err != nil {
+	if err := c.ValidateFlagGroups(); err != nil {
 		return err
 	}
 
@@ -1019,7 +1019,8 @@ func (c *Command) ValidateArgs(args []string) error {
 	return c.Args(c, args)
 }
 
-func (c *Command) validateRequiredFlags() error {
+// ValidateRequiredFlags validates all required flags are present and returns an error otherwise
+func (c *Command) ValidateRequiredFlags() error {
 	if c.DisableFlagParsing {
 		return nil
 	}

flag_groups.go

@@ -59,9 +59,9 @@ func (c *Command) MarkFlagsMutuallyExclusive(flagNames ...string) {
 	}
 }
 
-// validateFlagGroups validates the mutuallyExclusive/requiredAsGroup logic and returns the
+// ValidateFlagGroups validates the mutuallyExclusive/requiredAsGroup logic and returns the
 // first error encountered.
-func (c *Command) validateFlagGroups() error {
+func (c *Command) ValidateFlagGroups() error {
 	if c.DisableFlagParsing {
 		return nil
 	}