Update vendors

vendor/github.com/derekparker/delve/pkg/logflags/logflags.go

@@ -0,0 +1,83 @@
+package logflags
+
+import (
+	"errors"
+	"io/ioutil"
+	"log"
+	"strings"
+)
+
+var debugger = false
+var gdbWire = false
+var lldbServerOutput = false
+var debugLineErrors = false
+var rpc = false
+var fnCall = false
+
+// GdbWire returns true if the gdbserial package should log all the packets
+// exchanged with the stub.
+func GdbWire() bool {
+	return gdbWire
+}
+
+// Debugger returns true if the debugger package should log.
+func Debugger() bool {
+	return debugger
+}
+
+// LLDBServerOutput returns true if the output of the LLDB server should be
+// redirected to standard output instead of suppressed.
+func LLDBServerOutput() bool {
+	return lldbServerOutput
+}
+
+// DebugLineErrors returns true if pkg/dwarf/line should log its recoverable
+// errors.
+func DebugLineErrors() bool {
+	return debugLineErrors
+}
+
+// RPC returns true if rpc messages should be logged.
+func RPC() bool {
+	return rpc
+}
+
+// FnCall returns true if the function call protocol should be logged.
+func FnCall() bool {
+	return fnCall
+}
+
+var errLogstrWithoutLog = errors.New("--log-output specified without --log")
+
+// Setup sets debugger flags based on the contents of logstr.
+func Setup(logFlag bool, logstr string) error {
+	log.SetFlags(log.Ldate | log.Ltime | log.Lshortfile)
+	if !logFlag {
+		log.SetOutput(ioutil.Discard)
+		if logstr != "" {
+			return errLogstrWithoutLog
+		}
+		return nil
+	}
+	if logstr == "" {
+		logstr = "debugger"
+	}
+	v := strings.Split(logstr, ",")
+	for _, logcmd := range v {
+		switch logcmd {
+		case "debugger":
+			debugger = true
+		case "gdbwire":
+			gdbWire = true
+		case "lldbout":
+			lldbServerOutput = true
+		case "debuglineerr":
+			debugLineErrors = true
+		case "rpc":
+			rpc = true
+		case "fncall":
+			fnCall = true
+		}
+	}
+	return nil
+}