Error handling. Vendoring

Signed-off-by: Ettore Dreucci <ettore.dreucci@gmail.com>

vendor/gopkg.in/dixonwille/wlog.v2/prefix.go

@@ -0,0 +1,113 @@
+package wlog
+
+// PrefixUI is a wrapper for UI that prefixes all strings.
+// It does add a space betweem the prefix and message.
+// If no prefix is specified ("") then it does not prefix the space.
+type PrefixUI struct {
+	LogPrefix     string
+	OutputPrefix  string
+	SuccessPrefix string
+	InfoPrefix    string
+	ErrorPrefix   string
+	WarnPrefix    string
+	RunningPrefix string
+	AskPrefix     string
+	UI            UI
+}
+
+// Log calls UI.Log to write.
+// LogPrefix is used to prefix the message.
+func (ui *PrefixUI) Log(message string) {
+	if ui.LogPrefix == " " { //Lets keep the space if they want one
+		message = ui.LogPrefix + message
+	} else if ui.LogPrefix != "" {
+		message = ui.LogPrefix + " " + message
+	}
+	ui.UI.Log(message)
+}
+
+// Output calls UI.Output to write.
+// OutputPrefix is used to prefix the message.
+func (ui *PrefixUI) Output(message string) {
+	if ui.OutputPrefix == " " { //Lets keep the space if they want one
+		message = ui.OutputPrefix + message
+	} else if ui.OutputPrefix != "" {
+		message = ui.OutputPrefix + " " + message
+	}
+	ui.UI.Output(message)
+}
+
+// Success calls UI.Success to write.
+// Useful when you want separate colors or prefixes.
+// SuccessPrefix is used to prefix the message.
+func (ui *PrefixUI) Success(message string) {
+	if ui.SuccessPrefix == " " { //Lets keep the space if they want one
+		message = ui.SuccessPrefix + message
+	} else if ui.SuccessPrefix != "" {
+		message = ui.SuccessPrefix + " " + message
+	}
+	ui.UI.Success(message)
+}
+
+// Info calls UI.Info to write.
+// Useful when you want separate colors or prefixes.
+// InfoPrefix is used to prefix the message.
+func (ui *PrefixUI) Info(message string) {
+	if ui.InfoPrefix == " " { //Lets keep the space if they want one
+		message = ui.InfoPrefix + message
+	} else if ui.InfoPrefix != "" {
+		message = ui.InfoPrefix + " " + message
+	}
+	ui.UI.Info(message)
+}
+
+// Error call UI.Error to write.
+// ErrorPrefix is used to prefix the message.
+func (ui *PrefixUI) Error(message string) {
+	if ui.ErrorPrefix == " " { //Lets keep the space if they want one
+		message = ui.ErrorPrefix + message
+	} else if ui.ErrorPrefix != "" {
+		message = ui.ErrorPrefix + " " + message
+	}
+	ui.UI.Error(message)
+}
+
+// Warn calls UI.Warn to write.
+// Useful when you want separate colors or prefixes.
+// WarnPrefix is used to prefix message.
+func (ui *PrefixUI) Warn(message string) {
+	if ui.WarnPrefix == " " { //Lets keep the space if they want one
+		message = ui.WarnPrefix + message
+	} else if ui.WarnPrefix != "" {
+		message = ui.WarnPrefix + " " + message
+	}
+	ui.UI.Warn(message)
+}
+
+// Running calls Output to write.
+// Useful when you want separate colors or prefixes.
+// RunningPrefix is used to prefix message.
+func (ui *PrefixUI) Running(message string) {
+	if ui.RunningPrefix == " " { //Lets keep the space if they want one
+		message = ui.RunningPrefix + message
+	} else if ui.RunningPrefix != "" {
+		message = ui.RunningPrefix + " " + message
+	}
+	ui.UI.Running(message)
+}
+
+//Ask will call UI.Ask with message then wait for UI.Ask to return a response and/or error.
+//It will clean the response by removing any carriage returns and new lines that if finds.
+//Then it will trim the message using the trim variable.
+//Use and empty string to specify you do not want to trim.
+//If a message is not used ("") then it will not prompt user before waiting on a response.
+//AskPrefix is used to prefix message.
+func (ui *PrefixUI) Ask(message, trim string) (string, error) {
+	if ui.AskPrefix == " " { //Lets keep the space if they want one
+		message = ui.AskPrefix + message
+	} else if ui.AskPrefix != "" {
+		message = ui.AskPrefix + " " + message
+	}
+	res, err := ui.UI.Ask(message, trim)
+	return res, err
+}