monitoring dashboard dependency vendor

Signed-off-by: junotx <junotx@126.com>

vendor/github.com/MakeNowJust/heredoc/heredoc.go

@@ -0,0 +1,98 @@
+// Copyright (c) 2014-2017 TSUYUSATO Kitsune
+// This software is released under the MIT License.
+// http://opensource.org/licenses/mit-license.php
+
+// Package heredoc provides creation of here-documents from raw strings.
+//
+// Golang supports raw-string syntax.
+//     doc := `
+//     	Foo
+//     	Bar
+//     `
+// But raw-string cannot recognize indentation. Thus such content is an indented string, equivalent to
+//     "\n\tFoo\n\tBar\n"
+// I dont't want this!
+//
+// However this problem is solved by package heredoc.
+//     doc := heredoc.Doc(`
+//     	Foo
+//     	Bar
+//     `)
+// Is equivalent to
+//     "Foo\nBar\n"
+package heredoc
+
+import (
+	"fmt"
+	"strings"
+	"unicode"
+)
+
+const maxInt = int(^uint(0) >> 1)
+
+// Doc returns un-indented string as here-document.
+func Doc(raw string) string {
+	skipFirstLine := false
+	if len(raw) > 0 && raw[0] == '\n' {
+		raw = raw[1:]
+	} else {
+		skipFirstLine = true
+	}
+
+	lines := strings.Split(raw, "\n")
+
+	minIndentSize := getMinIndent(lines, skipFirstLine)
+	lines = removeIndentation(lines, minIndentSize, skipFirstLine)
+
+	return strings.Join(lines, "\n")
+}
+
+// getMinIndent calculates the minimum indentation in lines, excluding empty lines.
+func getMinIndent(lines []string, skipFirstLine bool) int {
+	minIndentSize := maxInt
+
+	for i, line := range lines {
+		if i == 0 && skipFirstLine {
+			continue
+		}
+
+		indentSize := 0
+		for _, r := range []rune(line) {
+			if unicode.IsSpace(r) {
+				indentSize += 1
+			} else {
+				break
+			}
+		}
+
+		if len(line) == indentSize {
+			if i == len(lines)-1 && indentSize < minIndentSize {
+				lines[i] = ""
+			}
+		} else if indentSize < minIndentSize {
+			minIndentSize = indentSize
+		}
+	}
+	return minIndentSize
+}
+
+// removeIndentation removes n characters from the front of each line in lines.
+// Skips first line if skipFirstLine is true, skips empty lines.
+func removeIndentation(lines []string, n int, skipFirstLine bool) []string {
+	for i, line := range lines {
+		if i == 0 && skipFirstLine {
+			continue
+		}
+
+		if len(lines[i]) >= n {
+			lines[i] = line[n:]
+		}
+	}
+	return lines
+}
+
+// Docf returns unindented and formatted string as here-document.
+// Formatting is done as for fmt.Printf().
+func Docf(raw string, args ...interface{}) string {
+	return fmt.Sprintf(Doc(raw), args...)
+}