Enhance fatal errors printing of common issues seen by users (#5878)

cmd/logger/utils.go

@@ -0,0 +1,52 @@
+/*
+ * Minio Cloud Storage, (C) 2018 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package logger
+
+import (
+	"fmt"
+	"regexp"
+
+	"github.com/fatih/color"
+)
+
+// Global colors.
+var (
+	colorBold    = color.New(color.Bold).SprintFunc()
+	colorFgRed   = color.New(color.FgRed).SprintfFunc()
+	colorBgRed   = color.New(color.BgRed).SprintfFunc()
+	colorFgWhite = color.New(color.FgWhite).SprintfFunc()
+)
+
+var ansiRE = regexp.MustCompile("(\x1b[^m]*m)")
+
+// Print ANSI Control escape
+func ansiEscape(format string, args ...interface{}) {
+	var Esc = "\x1b"
+	fmt.Printf("%s%s", Esc, fmt.Sprintf(format, args...))
+}
+
+func ansiMoveRight(n int) {
+	ansiEscape("[%dC", n)
+}
+
+func ansiSaveAttributes() {
+	ansiEscape("7")
+}
+
+func ansiRestoreAttributes() {
+	ansiEscape("8")
+}