Error handling. Vendoring

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

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

@@ -0,0 +1,72 @@
+//Package wlog creates simple to use UI structure.
+//The UI is used to simply print to the screen.
+//There a wrappers that will wrap each other to create a good looking UI.
+//You can add color and prefixes as well as make it thread safe.
+package wlog
+
+//TODO:10 Add a simple way to split writer between terminal and file
+//TODO:0 Add a TableUI
+import "io"
+
+//New creates a BasicUI.
+//This should be the first function you call.
+//This is not thread safe and should only be used in serial applications.
+func New(reader io.Reader, writer, errorWriter io.Writer) *BasicUI {
+	return &BasicUI{
+		Reader:      reader,
+		Writer:      writer,
+		ErrorWriter: errorWriter,
+	}
+}
+
+// AddConcurrent will wrap a thread safe UI on top of ui.
+// Safe to use inside of go routines.
+func AddConcurrent(ui UI) *ConcurrentUI {
+	return &ConcurrentUI{UI: ui}
+}
+
+//AddColor will wrap a colorful UI on top of ui.
+//Use wlog's color variables for the color.
+//All background colors are not changed by this function but you are able to change them manually.
+//Just create this structure manually and change any of the background colors you want.
+//Arguments are in alphabetical order.
+func AddColor(askColor, errorColor, infoColor, logColor, outputColor, responseColor, runningColor, successColor, warnColor Color, ui UI) *ColorUI {
+	return &ColorUI{
+		LogFGColor:      logColor,
+		LogBGColor:      None,
+		OutputFGColor:   outputColor,
+		OutputBGColor:   None,
+		SuccessFGColor:  successColor,
+		SuccessBGColor:  None,
+		InfoFGColor:     infoColor,
+		InfoBGColor:     None,
+		ErrorFGColor:    errorColor,
+		ErrorBGColor:    None,
+		WarnFGColor:     warnColor,
+		WarnBGColor:     None,
+		RunningFGColor:  runningColor,
+		RunningBGColor:  None,
+		AskFGColor:      askColor,
+		AskBGColor:      None,
+		ResponseFGColor: responseColor,
+		ResponseBGColor: None,
+		UI:              ui,
+	}
+}
+
+//AddPrefix will wrap a UI that will prefix the message on top of ui.
+//If a prefix is set to nothing ("") then there will be no prefix for that message type.
+//Arguments are in alphabetical order.
+func AddPrefix(askPre, errorPre, infoPre, logPre, outputPre, runningPre, successPre, warnPre string, ui UI) *PrefixUI {
+	return &PrefixUI{
+		LogPrefix:     logPre,
+		OutputPrefix:  outputPre,
+		SuccessPrefix: successPre,
+		InfoPrefix:    infoPre,
+		ErrorPrefix:   errorPre,
+		WarnPrefix:    warnPre,
+		RunningPrefix: runningPre,
+		AskPrefix:     askPre,
+		UI:            ui,
+	}
+}