Function checkIfFlagCompletion

completions.go:654–738

(finalCmd *Command, args []string, lastArg string)

}

func checkIfFlagCompletion(finalCmd *Command, args []string, lastArg string) (*pflag.Flag, []string, string, error) {
	if finalCmd.DisableFlagParsing {
		// We only do flag completion if we are allowed to parse flags
		// This is important for commands which have requested to do their own flag completion.
		return nil, args, lastArg, nil
	}

	var flagName string
	trimmedArgs := args
	flagWithEqual := false
	orgLastArg := lastArg

	// When doing completion of a flag name, as soon as an argument starts with
	// a '-' we know it is a flag.  We cannot use isFlagArg() here as that function
	// requires the flag name to be complete
	if len(lastArg) > 0 && lastArg[0] == '-' {
		if index := strings.Index(lastArg, "="); index >= 0 {
			// Flag with an =
			if strings.HasPrefix(lastArg[:index], "--") {
				// Flag has full name
				flagName = lastArg[2:index]
			} else {
				// Flag is shorthand
				// We have to get the last shorthand flag name
				// e.g. `-asd` => d to provide the correct completion
				// https://github.com/spf13/cobra/issues/1257
				flagName = lastArg[index-1 : index]
			}
			lastArg = lastArg[index+1:]
			flagWithEqual = true
		} else {
			// Normal flag completion
			return nil, args, lastArg, nil
		}
	}

	if len(flagName) == 0 {
		if len(args) > 0 {
			prevArg := args[len(args)-1]
			if isFlagArg(prevArg) {
				// Only consider the case where the flag does not contain an =.
				// If the flag contains an = it means it has already been fully processed,
				// so we don't need to deal with it here.
				if index := strings.Index(prevArg, "="); index < 0 {
					if strings.HasPrefix(prevArg, "--") {
						// Flag has full name
						flagName = prevArg[2:]
					} else {
						// Flag is shorthand
						// We have to get the last shorthand flag name
						// e.g. `-asd` => d to provide the correct completion
						// https://github.com/spf13/cobra/issues/1257
						flagName = prevArg[len(prevArg)-1:]
					}
					// Remove the uncompleted flag or else there could be an error created
					// for an invalid value for that flag
					trimmedArgs = args[:len(args)-1]
				}