Added errors package

src/errors/stack.go

@@ -0,0 +1,30 @@
+package errors
+
+import (
+	"runtime"
+	"strings"
+)
+
+// stack generates a stack trace.
+func stack() string {
+	var (
+		final  []string
+		buffer = make([]byte, 4096)
+		n      = runtime.Stack(buffer, false)
+		stack  = string(buffer[:n])
+		lines  = strings.Split(stack, "\n")
+	)
+
+	for i := 6; i < len(lines); i += 2 {
+		line := strings.TrimSpace(lines[i])
+		space := strings.LastIndex(line, " ")
+
+		if space != -1 {
+			line = line[:space]
+		}
+
+		final = append(final, line)
+	}
+
+	return strings.Join(final, "\n")
+}