1 files changed, 56 insertions, 0 deletions
diff --git a/vendor/github.com/renstrom/dedent/dedent.go b/vendor/github.com/renstrom/dedent/dedent.go
new file mode 100644
index 000000000..f58dc47d5
--- /dev/null
+++ b/vendor/github.com/renstrom/dedent/dedent.go
@@ -0,0 +1,56 @@
+package dedent
+
+import (
+	"regexp"
+	"strings"
+)
+
+var whitespaceOnly = regexp.MustCompile("(?m)^[ \t]+$")
+var leadingWhitespace = regexp.MustCompile("(?m)(^[ \t]*)")
+
+// Dedent removes any common leading whitespace from every line in s.
+//
+// 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(s string) string {
+	s = whitespaceOnly.ReplaceAllString(s, "")
+	margin := findMargin(s)
+	if len(margin) == 0 {
+		return s
+	}
+	return regexp.MustCompile("(?m)^"+margin).ReplaceAllString(s, "")
+}
+
+// Look for the longest leading string of spaces and tabs common to all lines.
+func findMargin(s string) string {
+	var margin string
+
+	indents := leadingWhitespace.FindAllString(s, -1)
+	numIndents := len(indents)
+	for i, indent := range indents {
+		// Don't use last row if it is empty
+		if i == numIndents-1 && indent == "" {
+			break
+		}
+
+		if margin == "" {
+			margin = indent
+		} else if strings.HasPrefix(indent, margin) {
+			// Current line more deeply indented than previous winner:
+			// no change (previous winner is still on top).
+			continue
+		} else if strings.HasPrefix(margin, indent) {
+			// Current line consistent with and no deeper than previous winner:
+			// it's the new winner.
+			margin = indent
+		} else {
+			// Current line and previous winner have no common whitespace:
+			// there is no margin.
+			margin = ""
+			break
+		}
+	}
+
+	return margin
+}