helper/scheam: support UI defaults

builtin/providers/aws/provider.go

@@ -19,10 +19,11 @@ func Provider() *schema.Provider {
 	return &schema.Provider{
 		Schema: map[string]*schema.Schema{
 			"region": &schema.Schema{
-				Type:        schema.TypeString,
-				Required:    true,
-				DefaultFunc: envDefaultFunc("AWS_REGION"),
-				Description: descriptions["region"],
+				Type:         schema.TypeString,
+				Required:     true,
+				DefaultFunc:  envDefaultFunc("AWS_REGION"),
+				Description:  descriptions["region"],
+				InputDefault: "us-east-1",
 			},
 
 			"access_key": &schema.Schema{

command/ui_input.go

@@ -82,6 +82,7 @@ func (i *UIInput) Input(opts *terraform.InputOpts) (string, error) {
 	if opts.Default != "" {
 		buf.WriteString("  [bold]Default:[reset] ")
 		buf.WriteString(opts.Default)
+		buf.WriteString("\n")
 	}
 	buf.WriteString("  [bold]Enter a value:[reset] ")
 

helper/schema/schema.go

@@ -14,6 +14,7 @@ package schema
 import (
 	"fmt"
 	"reflect"
+	"sort"
 	"strconv"
 	"strings"
 
@@ -79,6 +80,9 @@ type Schema struct {
 	// be formatted to fit a CLI.
 	Description string
 
+	// InputDefault is the default value to use for when inputs are requested.
+	InputDefault string
+
 	// The fields below relate to diffs.
 	//
 	// If Computed is true, then the result of this value is computed
@@ -280,7 +284,15 @@ func (m schemaMap) Diff(
 func (m schemaMap) Input(
 	input terraform.UIInput,
 	c *terraform.ResourceConfig) (*terraform.ResourceConfig, error) {
-	for k, v := range m {
+	keys := make([]string, 0, len(m))
+	for k, _ := range m {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+
+	for _, k := range keys {
+		v := m[k]
+
 		// Skip things that don't require config, if that is even valid
 		// for a provider schema.
 		if !v.Required && !v.Optional {
@@ -623,6 +635,7 @@ func (m schemaMap) inputString(
 		Id:          k,
 		Query:       k,
 		Description: schema.Description,
+		Default:     schema.InputDefault,
 	})
 
 	return result, err

terraform/ui_input.go

@@ -22,6 +22,5 @@ type InputOpts struct {
 	Description string
 
 	// Default will be the value returned if no data is entered.
-	Default       string
-	DefaultHidden bool
+	Default string
 }