terraform/command/autocomplete.go

package command

import (
	"github.com/posener/complete"
)

// This file contains some re-usable predictors for auto-complete. The
// command-specific autocomplete configurations live within each command's
// own source file, as AutocompleteArgs and AutocompleteFlags methods on each
// Command implementation.

// For completing the value of boolean flags like -foo false
var completePredictBoolean = complete.PredictSet("true", "false")

// We don't currently have a real predictor for module sources, but
// we'll probably add one later.
var completePredictModuleSource = complete.PredictAnything

type completePredictSequence []complete.Predictor

func (s completePredictSequence) Predict(a complete.Args) []string {
	// Only one level of command is stripped off the prefix of a.Completed
	// here, so nested subcommands like "workspace new" will need to provide
	// dummy entries (e.g. complete.PredictNothing) as placeholders for
	// all but the first subcommand. For example, "workspace new" needs
	// one placeholder for the argument "new".
	idx := len(a.Completed)
	if idx >= len(s) {
		return nil
	}

	return s[idx].Predict(a)
}