Add self-contained gometalinter build tooling.

tools/vendor/github.com/alexflint/go-scalar/LICENSE

@@ -0,0 +1,24 @@
+Copyright (c) 2015, Alex Flint
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+

tools/vendor/github.com/alexflint/go-scalar/README.md

@@ -0,0 +1,28 @@
+[![GoDoc](https://godoc.org/github.com/alexflint/go-scalar?status.svg)](https://godoc.org/github.com/alexflint/go-scalar)
+[![Build Status](https://travis-ci.org/alexflint/go-scalar.svg?branch=master)](https://travis-ci.org/alexflint/go-scalar)
+[![Coverage Status](https://coveralls.io/repos/alexflint/go-scalar/badge.svg?branch=master&service=github)](https://coveralls.io/github/alexflint/go-scalar?branch=master)
+[![Report Card](https://goreportcard.com/badge/github.com/alexflint/go-scalar)](https://goreportcard.com/badge/github.com/alexflint/go-scalar)
+
+## Scalar parsing library
+
+Scalar is a library for parsing strings into arbitrary scalars (integers,
+floats, strings, booleans, etc). It is helpful for tasks such as parsing
+strings passed as environment variables or command line arguments.
+
+```shell
+go get github.com/alexflint/go-scalar
+```
+
+The main API works as follows:
+
+```go
+var value int
+err := scalar.Parse(&value, "123")
+```
+
+There is also a variant that takes a `reflect.Value`:
+
+```go
+var value int
+err := scalar.ParseValue(reflect.ValueOf(&value), "123")
+```

tools/vendor/github.com/alexflint/go-scalar/scalar.go

@@ -0,0 +1,154 @@
+// Package scalar parses strings into values of scalar type.
+
+package scalar
+
+import (
+	"encoding"
+	"errors"
+	"fmt"
+	"net"
+	"net/mail"
+	"reflect"
+	"strconv"
+	"time"
+)
+
+// The reflected form of some special types
+var (
+	textUnmarshalerType = reflect.TypeOf([]encoding.TextUnmarshaler{}).Elem()
+	durationType        = reflect.TypeOf(time.Duration(0))
+	mailAddressType     = reflect.TypeOf(mail.Address{})
+	ipType              = reflect.TypeOf(net.IP{})
+	macType             = reflect.TypeOf(net.HardwareAddr{})
+)
+
+var (
+	errNotSettable    = errors.New("value is not settable")
+	errPtrNotSettable = errors.New("value is a nil pointer and is not settable")
+)
+
+// Parse assigns a value to v by parsing s.
+func Parse(dest interface{}, s string) error {
+	return ParseValue(reflect.ValueOf(dest), s)
+}
+
+// ParseValue assigns a value to v by parsing s.
+func ParseValue(v reflect.Value, s string) error {
+	// If we have a nil pointer then allocate a new object
+	if v.Kind() == reflect.Ptr && v.IsNil() {
+		if !v.CanSet() {
+			return errPtrNotSettable
+		}
+
+		v.Set(reflect.New(v.Type().Elem()))
+	}
+
+	// If it implements encoding.TextUnmarshaler then use that
+	if scalar, ok := v.Interface().(encoding.TextUnmarshaler); ok {
+		return scalar.UnmarshalText([]byte(s))
+	}
+
+	// If we have a pointer then dereference it
+	if v.Kind() == reflect.Ptr {
+		v = v.Elem()
+	}
+
+	if !v.CanSet() {
+		return errNotSettable
+	}
+
+	// Switch on concrete type
+	switch scalar := v.Interface(); scalar.(type) {
+	case time.Duration:
+		duration, err := time.ParseDuration(s)
+		if err != nil {
+			return err
+		}
+		v.Set(reflect.ValueOf(duration))
+		return nil
+	case mail.Address:
+		addr, err := mail.ParseAddress(s)
+		if err != nil {
+			return err
+		}
+		v.Set(reflect.ValueOf(*addr))
+		return nil
+	case net.IP:
+		ip := net.ParseIP(s)
+		if ip == nil {
+			return fmt.Errorf(`invalid IP address: "%s"`, s)
+		}
+		v.Set(reflect.ValueOf(ip))
+		return nil
+	case net.HardwareAddr:
+		ip, err := net.ParseMAC(s)
+		if err != nil {
+			return err
+		}
+		v.Set(reflect.ValueOf(ip))
+		return nil
+	}
+
+	// Switch on kind so that we can handle derived types
+	switch v.Kind() {
+	case reflect.String:
+		v.SetString(s)
+	case reflect.Bool:
+		x, err := strconv.ParseBool(s)
+		if err != nil {
+			return err
+		}
+		v.SetBool(x)
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		x, err := strconv.ParseInt(s, 10, v.Type().Bits())
+		if err != nil {
+			return err
+		}
+		v.SetInt(x)
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+		x, err := strconv.ParseUint(s, 10, v.Type().Bits())
+		if err != nil {
+			return err
+		}
+		v.SetUint(x)
+	case reflect.Float32, reflect.Float64:
+		x, err := strconv.ParseFloat(s, v.Type().Bits())
+		if err != nil {
+			return err
+		}
+		v.SetFloat(x)
+	default:
+		return fmt.Errorf("cannot parse into %v", v.Type())
+	}
+	return nil
+}
+
+// CanParse returns true if the type can be parsed from a string.
+func CanParse(t reflect.Type) bool {
+	// If it implements encoding.TextUnmarshaler then use that
+	if t.Implements(textUnmarshalerType) {
+		return true
+	}
+
+	// If we have a pointer then dereference it
+	if t.Kind() == reflect.Ptr {
+		t = t.Elem()
+	}
+
+	// Check for other special types
+	switch t {
+	case durationType, mailAddressType, ipType, macType:
+		return true
+	}
+
+	// Fall back to checking the kind
+	switch t.Kind() {
+	case reflect.Bool:
+		return true
+	case reflect.String, reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
+		reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr,
+		reflect.Float32, reflect.Float64:
+		return true
+	}
+	return false
+}