Add dedent pkg

vendor/github.com/renstrom/dedent/.travis.yml

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+language: go
+
+go:
+  - 1.0
+  - 1.1
+  - 1.2
+  - 1.3
+  - 1.4
+  - 1.5
+
+sudo: false

vendor/github.com/renstrom/dedent/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015 Peter Renström
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

vendor/github.com/renstrom/dedent/README.md

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+# Dedent
+
+[![Build Status](https://travis-ci.org/renstrom/dedent.svg?branch=master)](https://travis-ci.org/renstrom/dedent)
+[![Godoc](https://img.shields.io/badge/godoc-reference-blue.svg?style=flat)](https://godoc.org/github.com/renstrom/dedent)
+
+Removes common leading whitespace from multiline strings. Inspired by [`textwrap.dedent`](https://docs.python.org/3/library/textwrap.html#textwrap.dedent) in Python.
+
+## Usage / example
+
+Imagine the following snippet that prints a multiline string. You want the indentation to both look nice in the code as well as in the actual output.
+
+```go
+package main
+
+import (
+    "fmt"
+
+    "github.com/renstrom/dedent"
+)
+
+func main() {
+    s := `Lorem ipsum dolor sit amet,
+        consectetur adipiscing elit.
+        Curabitur justo tellus, facilisis nec efficitur dictum,
+        fermentum vitae ligula. Sed eu convallis sapien.`
+    fmt.Println(dedent.Dedent(s))
+    fmt.Println("-------------")
+    fmt.Println(s)
+}
+```
+
+To illustrate the difference, here's the output:
+
+
+```bash
+$ go run main.go
+Lorem ipsum dolor sit amet,
+consectetur adipiscing elit.
+Curabitur justo tellus, facilisis nec efficitur dictum,
+fermentum vitae ligula. Sed eu convallis sapien.
+-------------
+Lorem ipsum dolor sit amet,
+        consectetur adipiscing elit.
+        Curabitur justo tellus, facilisis nec efficitur dictum,
+        fermentum vitae ligula. Sed eu convallis sapien.
+```
+
+## License
+
+MIT

vendor/github.com/renstrom/dedent/dedent.go

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+package dedent
+
+import (
+	"regexp"
+	"strings"
+)
+
+var (
+	whitespaceOnly    = regexp.MustCompile("(?m)^[ \t]+$")
+	leadingWhitespace = regexp.MustCompile("(?m)(^[ \t]*)(?:[^ \t\n])")
+)
+
+// Dedent removes any common leading whitespace from every line in text.
+//
+// This can be used to make multiline strings to line up with the left edge of
+// the display, while still presenting them in the source code in indented
+// form.
+func Dedent(text string) string {
+	var margin string
+
+	text = whitespaceOnly.ReplaceAllString(text, "")
+	indents := leadingWhitespace.FindAllStringSubmatch(text, -1)
+
+	// Look for the longest leading string of spaces and tabs common to all
+	// lines.
+	for i, indent := range indents {
+		if i == 0 {
+			margin = indent[1]
+		} else if strings.HasPrefix(indent[1], margin) {
+			// Current line more deeply indented than previous winner:
+			// no change (previous winner is still on top).
+			continue
+		} else if strings.HasPrefix(margin, indent[1]) {
+			// Current line consistent with and no deeper than previous winner:
+			// it's the new winner.
+			margin = indent[1]
+		} else {
+			// Current line and previous winner have no common whitespace:
+			// there is no margin.
+			margin = ""
+			break
+		}
+	}
+
+	if margin != "" {
+		text = regexp.MustCompile("(?m)^"+margin).ReplaceAllString(text, "")
+	}
+	return text
+}