command: warnings should not exit

also properly colorize error/warnings

depends on https://github.com/mitchellh/cli/pull/15

command/cli_ui.go

@@ -14,6 +14,7 @@ type ColorizeUi struct {
 	OutputColor string
 	InfoColor   string
 	ErrorColor  string
+	WarnColor   string
 	Ui          cli.Ui
 }
 
@@ -33,6 +34,10 @@ func (u *ColorizeUi) Error(message string) {
 	u.Ui.Error(u.colorize(message, u.ErrorColor))
 }
 
+func (u *ColorizeUi) Warn(message string) {
+	u.Ui.Warn(u.colorize(message, u.WarnColor))
+}
+
 func (u *ColorizeUi) colorize(message string, color string) string {
 	if color == "" {
 		return message

command/command.go

@@ -33,9 +33,9 @@ func validateContext(ctx *terraform.Context, ui cli.Ui) bool {
 				"fix these before continuing.\n")
 
 		if len(ws) > 0 {
-			ui.Output("Warnings:\n")
+			ui.Warn("Warnings:\n")
 			for _, w := range ws {
-				ui.Output(fmt.Sprintf("  * %s", w))
+				ui.Warn(fmt.Sprintf("  * %s", w))
 			}
 
 			if len(es) > 0 {
@@ -44,13 +44,16 @@ func validateContext(ctx *terraform.Context, ui cli.Ui) bool {
 		}
 
 		if len(es) > 0 {
-			ui.Output("Errors:\n")
+			ui.Error("Errors:\n")
 			for _, e := range es {
-				ui.Output(fmt.Sprintf("  * %s", e))
+				ui.Error(fmt.Sprintf("  * %s", e))
 			}
-		}
-
 			return false
+		} else {
+			ui.Warn(fmt.Sprintf("\n"+
+				"No errors found. Continuing with %d warning(s).\n", len(ws)))
+			return true
+		}
 	}
 
 	return true

command/meta.go

@@ -331,6 +331,7 @@ func (m *Meta) process(args []string, vars bool) []string {
 		Ui: &ColorizeUi{
 			Colorize:   m.Colorize(),
 			ErrorColor: "[red]",
+			WarnColor:  "[yellow]",
 			Ui:         m.oldUi,
 		},
 	}