Repository: spf13/cobra
File: command.go (Go)

Code before:
	flagErrorFunc func(*Command, error) error
	// helpTemplate is help template defined by user.
	helpTemplate string
	// helpFunc is help func defined by user.
	helpFunc func(*Command, []string)
	// helpCommand is command with usage 'help'. If it's not defined by user,
	// cobra uses default help command.
	helpCommand *Command
	// versionTemplate is the version template defined by user.
	versionTemplate string

	// inReader is a reader defined by the user that replaces stdin
	inReader io.Reader
	// outWriter is a writer defined by the user that replaces stdout
	outWriter io.Writer
	// errWriter is a writer defined by the user that replaces stderr
	errWriter io.Writer
}

// Context returns underlying command context. If command wasn't
// executed with ExecuteContext the returned context will be nil.
func (c *Command) Context() context.Context {
	return c.ctx
}

// SetArgs sets arguments for the command. It is set to os.Args[1:] by default, if desired, can be overridden
// particularly useful when testing.
func (c *Command) SetArgs(a []string) {
	c.args = a
}

// SetOutput sets the destination for usage and error messages.
// If output is nil, os.Stderr is used.
// Deprecated: Use SetOut and/or SetErr instead
func (c *Command) SetOutput(output io.Writer) {
	c.outWriter = output
	c.errWriter = output
}

// SetOut sets the destination for usage messages.
// If newOut is nil, os.Stdout is used.
func (c *Command) SetOut(newOut io.Writer) {
	c.outWriter = newOut
}

// SetErr sets the destination for error messages.
// If newErr is nil, os.Stderr is used.
func (c *Command) SetErr(newErr io.Writer) {
	c.errWriter = newErr
}


Review comment (suggestion):
Generally you do not want to have a nil context.
Instead I'd recommend we make sure that context is at least `context.Background()`.

Code after:
	usageTemplate string
	// flagErrorFunc is func defined by user and it's called when the parsing of
	// flags returns an error.
	flagErrorFunc func(*Command, error) error
	// helpTemplate is help template defined by user.
	helpTemplate string
	// helpFunc is help func defined by user.
	helpFunc func(*Command, []string)
	// helpCommand is command with usage 'help'. If it's not defined by user,
	// cobra uses default help command.
	helpCommand *Command
	// versionTemplate is the version template defined by user.
	versionTemplate string

	// inReader is a reader defined by the user that replaces stdin
	inReader io.Reader
	// outWriter is a writer defined by the user that replaces stdout
	outWriter io.Writer
	// errWriter is a writer defined by the user that replaces stderr
	errWriter io.Writer
}

// Context returns underlying command context. If command wasn't
// executed with ExecuteContext Context returns Background context.
func (c *Command) Context() context.Context {
	return c.ctx
}

// SetArgs sets arguments for the command. It is set to os.Args[1:] by default, if desired, can be overridden
// particularly useful when testing.
func (c *Command) SetArgs(a []string) {
	c.args = a
}

// SetOutput sets the destination for usage and error messages.
// If output is nil, os.Stderr is used.
// Deprecated: Use SetOut and/or SetErr instead
func (c *Command) SetOutput(output io.Writer) {
	c.outWriter = output
	c.errWriter = output
}

// SetOut sets the destination for usage messages.
// If newOut is nil, os.Stdout is used.
func (c *Command) SetOut(newOut io.Writer) {
	c.outWriter = newOut
}

// SetErr sets the destination for error messages.
// If newErr is nil, os.Stderr is used.
func (c *Command) SetErr(newErr io.Writer) {