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# This is the official list of people who can contribute
# (and typically have contributed) code to the gotraining repository.
#
# Names should be added to this file only after verifying that
# the individual or the individual's organization has agreed to
# the appropriate Contributor License Agreement, found here:
#
# http://code.google.com/legal/individual-cla-v1.0.html
# http://code.google.com/legal/corporate-cla-v1.0.html
#
# The agreement for individuals can be filled out on the web.
# Names should be added to this file like so:
# Name <email address>
#
# An entry with two email addresses specifies that the
# first address should be used in the submit logs and
# that the second address should be recognized as the
# same person when interacting with Rietveld.
# Please keep the list sorted.
Arash Bina <arash@arash.io>
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Fábio Correia <fabiodcorreia@gmail.com>
Kelsey Hightower
Peter Bourgon
Steven Edwards <steven@stephenwithav.com>
William Kennedy <bill@ardanlabs.com>

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Apache License
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http://www.apache.org/licenses/
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# Conf
[![CircleCI](https://circleci.com/gh/ardanlabs/conf.svg?style=svg)](https://circleci.com/gh/ardanlabs/conf)
Copyright 2018, 2019, 2020, 2021, Ardan Labs
info@ardanlabs.com
## Licensing
```
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
```
## About The Project
Package conf provides support for using environmental variables and command
line arguments for configuration.
All of the documentation can be found on the [go.dev](https://pkg.go.dev/github.com/ardanlabs/conf?tab=doc) website.

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package conf
import (
"errors"
"fmt"
"net/url"
"os"
"reflect"
"strings"
)
// ErrInvalidStruct indicates that a configuration struct is not the correct type.
var ErrInvalidStruct = errors.New("configuration must be a struct pointer")
// A FieldError occurs when an error occurs updating an individual field
// in the provided struct value.
type FieldError struct {
fieldName string
typeName string
value string
err error
}
func (err *FieldError) Error() string {
return fmt.Sprintf("conf: error assigning to field %s: converting '%s' to type %s. details: %s", err.fieldName, err.value, err.typeName, err.err)
}
// Sourcer provides the ability to source data from a configuration source.
// Consider the use of lazy-loading for sourcing large datasets or systems.
type Sourcer interface {
// Source takes the field key and attempts to locate that key in its
// configuration data. Returns true if found with the value.
Source(fld Field) (string, bool)
}
// Version provides the abitily to add version and description to the application.
type Version struct {
SVN string
Desc string
}
// ParseOSArgs parses the configuration allowing command line
// arguments to override settings. Function returns ErrHelpWanted
// for any information to be provided to the user.
func ParseOSArgs(prefix string, cfg interface{}) (string, error) {
err := Parse(os.Args[1:], prefix, cfg)
if err == nil {
return "", nil
}
switch err {
case ErrHelpWanted:
usage, err := Usage(prefix, cfg)
if err != nil {
return "", fmt.Errorf("generating config usage: %w", err)
}
return usage, ErrHelpWanted
case ErrVersionWanted:
version, err := VersionString(prefix, cfg)
if err != nil {
return "", fmt.Errorf("generating config version: %w", err)
}
return version, ErrHelpWanted
}
return "", fmt.Errorf("parsing config: %w", err)
}
// Parse parses configuration into the provided struct.
func Parse(args []string, namespace string, cfgStruct interface{}, sources ...Sourcer) error {
// Create the flag source.
flag, err := newSourceFlag(args)
if err != nil {
return err
}
// Append default sources to any provided list.
sources = append(sources, newSourceEnv(namespace))
sources = append(sources, flag)
// Get the list of fields from the configuration struct to process.
fields, err := extractFields(nil, cfgStruct)
if err != nil {
return err
}
if len(fields) == 0 {
return errors.New("no fields identified in config struct")
}
// Process all fields found in the config struct provided.
for _, field := range fields {
// If the field is supposed to hold the leftover args then copy them in
// from the flags source.
if field.Field.Type() == argsT {
args := reflect.ValueOf(Args(flag.args))
field.Field.Set(args)
continue
}
// Set any default value into the struct for this field.
if field.Options.DefaultVal != "" {
if err := processField(field.Options.DefaultVal, field.Field); err != nil {
return &FieldError{
fieldName: field.Name,
typeName: field.Field.Type().String(),
value: field.Options.DefaultVal,
err: err,
}
}
}
// Process each field against all sources.
var everProvided bool
for _, sourcer := range sources {
if sourcer == nil {
continue
}
value, provided := sourcer.Source(field)
if !provided {
continue
}
everProvided = true
// A value was found so update the struct value with it.
if err := processField(value, field.Field); err != nil {
return &FieldError{
fieldName: field.Name,
typeName: field.Field.Type().String(),
value: value,
err: err,
}
}
}
// If this key is not provided by any source, check if it was
// required to be provided.
if !everProvided && field.Options.Required {
return fmt.Errorf("required field %s is missing value", field.Name)
}
}
return nil
}
// Usage provides output to display the config usage on the command line.
func Usage(namespace string, v interface{}) (string, error) {
fields, err := extractFields(nil, v)
if err != nil {
return "", err
}
return fmtUsage(namespace, fields), nil
}
// VersionString provides output to display the application version and description on the command line.
func VersionString(namespace string, v interface{}) (string, error) {
fields, err := extractFields(nil, v)
if err != nil {
return "", err
}
var str strings.Builder
for i := range fields {
if fields[i].Name == versionKey && fields[i].Field.Len() > 0 {
str.WriteString("Version: ")
str.WriteString(fields[i].Field.String())
continue
}
if fields[i].Name == descKey && fields[i].Field.Len() > 0 {
if str.Len() > 0 {
str.WriteString("\n")
}
str.WriteString(fields[i].Field.String())
break
}
}
return str.String(), nil
}
// String returns a stringified version of the provided conf-tagged
// struct, minus any fields tagged with `noprint`.
func String(v interface{}) (string, error) {
fields, err := extractFields(nil, v)
if err != nil {
return "", err
}
var s strings.Builder
for i, fld := range fields {
if fld.Options.Noprint {
continue
}
s.WriteString(flagUsage(fld))
s.WriteString("=")
v := fmt.Sprintf("%v", fld.Field.Interface())
switch {
case fld.Options.Mask:
if u, err := url.Parse(v); err == nil {
userPass := u.User.String()
if userPass != "" {
v = strings.Replace(v, userPass, "xxxxxx:xxxxxx", 1)
s.WriteString(v)
break
}
}
s.WriteString("xxxxxx")
default:
s.WriteString(v)
}
if i < len(fields)-1 {
s.WriteString("\n")
}
}
return s.String(), nil
}
// Args holds command line arguments after flags have been parsed.
type Args []string
// argsT is used by Parse and Usage to detect struct fields of the Args type.
var argsT = reflect.TypeOf(Args{})
// Num returns the i'th argument in the Args slice. It returns an empty string
// the request element is not present.
func (a Args) Num(i int) string {
if i < 0 || i >= len(a) {
return ""
}
return a[i]
}

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/*
Package conf provides support for using environmental variables and command
line arguments for configuration.
It is compatible with the GNU extensions to the POSIX recommendations
for command-line options. See
http://www.gnu.org/software/libc/manual/html_node/Argument-Syntax.html
There are no hard bindings for this package. This package takes a struct
value and parses it for both the environment and flags. It supports several tags
to customize the flag options.
default - Provides the default value for the help
env - Allows for overriding the default variable name.
flag - Allows for overriding the default flag name.
short - Denotes a shorthand option for the flag.
noprint - Denotes to not include the field in any display string.
mask - Includes the field in any display string but masks out the value.
required - Denotes a value must be provided.
help - Provides a description for the help.
The field name and any parent struct name will be used for the long form of
the command name unless the name is overridden.
As an example, this config struct:
type ip struct {
Name string `conf:"default:localhost,env:IP_NAME_VAR"`
IP string `conf:"default:127.0.0.0"`
}
type Embed struct {
Name string `conf:"default:bill"`
Duration time.Duration `conf:"default:1s,flag:e-dur,short:d"`
}
type config struct {
AnInt int `conf:"default:9"`
AString string `conf:"default:B,short:s"`
Bool bool
Skip string `conf:"-"`
IP ip
Embed
}
Would produce the following usage output:
Usage: conf.test [options] [arguments]
OPTIONS
--an-int/$CRUD_AN_INT <int> (default: 9)
--a-string/-s/$CRUD_A_STRING <string> (default: B)
--bool/$CRUD_BOOL <bool>
--ip-name/$CRUD_IP_NAME_VAR <string> (default: localhost)
--ip-ip/$CRUD_IP_IP <string> (default: 127.0.0.0)
--name/$CRUD_NAME <string> (default: bill)
--e-dur/-d/$CRUD_DURATION <duration> (default: 1s)
--help/-h
display this help message
--version/-v
display version information
The API is a single call to Parse
// Parse(args []string, namespace string, cfgStruct interface{}, sources ...Sourcer) error
if err := conf.Parse(os.Args, "CRUD", &cfg); err != nil {
log.Fatalf("main : Parsing Config : %v", err)
}
Additionally, if the config struct has a field of the slice type conf.Args
then it will be populated with any remaining arguments from the command line
after flags have been processed.
For example a program with a config struct like this:
var cfg struct {
Port int
Args conf.Args
}
If that program is executed from the command line like this:
$ my-program --port=9000 serve http
Then the cfg.Args field will contain the string values ["serve", "http"].
The Args type has a method Num for convenient access to these arguments
such as this:
arg0 := cfg.Args.Num(0) // "serve"
arg1 := cfg.Args.Num(1) // "http"
arg2 := cfg.Args.Num(2) // "" empty string: not enough arguments
You can add a version with a description by adding the Version type to
your config type
type ConfExplicit struct {
Version conf.Version
Address string
}
type ConfImplicit struct {
conf.Version
Address string
}
Then you can set these values at run time for display.
cfg := struct {
Version conf.Version
}{
Version: conf.Version{
SVN: "v1.0.0",
Desc: "Service Description",
},
}
if err := conf.Parse(os.Args[1:], "APP", &cfg); err != nil {
if err == conf.ErrVersionWanted {
version, err := conf.VersionString("APP", &cfg)
if err != nil {
return err
}
fmt.Println(version)
return nil
}
fmt.Println("parsing config", err)
}
*/
package conf

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package conf
import (
"encoding"
"fmt"
"reflect"
"strconv"
"strings"
"time"
"unicode"
)
// Field maintains information about a field in the configuration struct.
type Field struct {
Name string
FlagKey []string
EnvKey []string
Field reflect.Value
Options FieldOptions
// Important for flag parsing or any other source where
// booleans might be treated specially.
BoolField bool
}
// FieldOptions maintain flag options for a given field.
type FieldOptions struct {
Help string
DefaultVal string
EnvName string
FlagName string
ShortFlagChar rune
Noprint bool
Required bool
Mask bool
}
// extractFields uses reflection to examine the struct and generate the keys.
func extractFields(prefix []string, target interface{}) ([]Field, error) {
if prefix == nil {
prefix = []string{}
}
s := reflect.ValueOf(target)
if s.Kind() != reflect.Ptr {
return nil, ErrInvalidStruct
}
s = s.Elem()
if s.Kind() != reflect.Struct {
return nil, ErrInvalidStruct
}
targetType := s.Type()
var fields []Field
for i := 0; i < s.NumField(); i++ {
f := s.Field(i)
structField := targetType.Field(i)
// Get the conf tags associated with this item (if any).
fieldTags := structField.Tag.Get("conf")
// If it's ignored or can't be set, move on.
if !f.CanSet() || fieldTags == "-" {
continue
}
fieldName := structField.Name
// Get and options. TODO: Need more.
fieldOpts, err := parseTag(fieldTags)
if err != nil {
return nil, fmt.Errorf("conf: error parsing tags for field %s: %s", fieldName, err)
}
// Generate the field key. This could be ignored.
fieldKey := append(prefix, camelSplit(fieldName)...)
// Drill down through pointers until we bottom out at type or nil.
for f.Kind() == reflect.Ptr {
if f.IsNil() {
// It's not a struct so leave it alone.
if f.Type().Elem().Kind() != reflect.Struct {
break
}
// It is a struct so zero it out.
f.Set(reflect.New(f.Type().Elem()))
}
f = f.Elem()
}
switch {
// If we've found a struct, drill down, appending fields as we go.
case f.Kind() == reflect.Struct:
// Skip if it can deserialize itself.
if setterFrom(f) == nil && textUnmarshaler(f) == nil && binaryUnmarshaler(f) == nil {
// Prefix for any subkeys is the fieldKey, unless it's
// anonymous, then it's just the prefix so far.
innerPrefix := fieldKey
if structField.Anonymous {
innerPrefix = prefix
}
embeddedPtr := f.Addr().Interface()
innerFields, err := extractFields(innerPrefix, embeddedPtr)
if err != nil {
return nil, err
}
fields = append(fields, innerFields...)
}
default:
envKey := fieldKey
if fieldOpts.EnvName != "" {
envKey = strings.Split(fieldOpts.EnvName, "_")
}
flagKey := fieldKey
if fieldOpts.FlagName != "" {
flagKey = strings.Split(fieldOpts.FlagName, "-")
}
fld := Field{
Name: fieldName,
EnvKey: envKey,
FlagKey: flagKey,
Field: f,
Options: fieldOpts,
BoolField: f.Kind() == reflect.Bool,
}
fields = append(fields, fld)
}
}
return fields, nil
}
func parseTag(tagStr string) (FieldOptions, error) {
var f FieldOptions
if tagStr == "" {
return f, nil
}
tagParts := strings.Split(tagStr, ",")
for _, tagPart := range tagParts {
vals := strings.SplitN(tagPart, ":", 2)
tagProp := vals[0]
switch len(vals) {
case 1:
switch tagProp {
case "noprint":
f.Noprint = true
case "required":
f.Required = true
case "mask":
f.Mask = true
}
case 2:
tagPropVal := strings.TrimSpace(vals[1])
if tagPropVal == "" {
return f, fmt.Errorf("tag %q missing a value", tagProp)
}
switch tagProp {
case "short":
if len([]rune(tagPropVal)) != 1 {
return f, fmt.Errorf("short value must be a single rune, got %q", tagPropVal)
}
f.ShortFlagChar = []rune(tagPropVal)[0]
case "default":
f.DefaultVal = tagPropVal
case "env":
f.EnvName = tagPropVal
case "flag":
f.FlagName = tagPropVal
case "help":
f.Help = tagPropVal
}
default:
// TODO: Do we check for integrity issues here?
}
}
// Perform a sanity check.
switch {
case f.Required && f.DefaultVal != "":
return f, fmt.Errorf("cannot set both `required` and `default`")
}
return f, nil
}
// camelSplit takes a string based on camel case and splits it.
func camelSplit(src string) []string {
if src == "" {
return []string{}
}
if len(src) < 2 {
return []string{src}
}
runes := []rune(src)
lastClass := charClass(runes[0])
lastIdx := 0
out := []string{}
// Split into fields based on class of unicode character.
for i, r := range runes {
class := charClass(r)
// If the class has transitioned.
if class != lastClass {
// If going from uppercase to lowercase, we want to retain the last
// uppercase letter for names like FOOBar, which should split to
// FOO Bar.
switch {
case lastClass == classUpper && class != classNumber:
if i-lastIdx > 1 {
out = append(out, string(runes[lastIdx:i-1]))
lastIdx = i - 1
}
default:
out = append(out, string(runes[lastIdx:i]))
lastIdx = i
}
}
if i == len(runes)-1 {
out = append(out, string(runes[lastIdx:]))
}
lastClass = class
}
return out
}
func processField(value string, field reflect.Value) error {
typ := field.Type()
// Look for a Set method.
setter := setterFrom(field)
if setter != nil {
return setter.Set(value)
}
if t := textUnmarshaler(field); t != nil {
return t.UnmarshalText([]byte(value))
}
if b := binaryUnmarshaler(field); b != nil {
return b.UnmarshalBinary([]byte(value))
}
if typ.Kind() == reflect.Ptr {
typ = typ.Elem()
if field.IsNil() {
field.Set(reflect.New(typ))
}
field = field.Elem()
}
switch typ.Kind() {
case reflect.String:
field.SetString(value)
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
var (
val int64
err error
)
if field.Kind() == reflect.Int64 && typ.PkgPath() == "time" && typ.Name() == "Duration" {
var d time.Duration
d, err = time.ParseDuration(value)
val = int64(d)
} else {
val, err = strconv.ParseInt(value, 0, typ.Bits())
}
if err != nil {
return err
}
field.SetInt(val)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
val, err := strconv.ParseUint(value, 0, typ.Bits())
if err != nil {
return err
}
field.SetUint(val)
case reflect.Bool:
val, err := strconv.ParseBool(value)
if err != nil {
return err
}
field.SetBool(val)
case reflect.Float32, reflect.Float64:
val, err := strconv.ParseFloat(value, typ.Bits())
if err != nil {
return err
}
field.SetFloat(val)
case reflect.Slice:
vals := strings.Split(value, ";")
sl := reflect.MakeSlice(typ, len(vals), len(vals))
for i, val := range vals {
err := processField(val, sl.Index(i))
if err != nil {
return err
}
}
field.Set(sl)
case reflect.Map:
mp := reflect.MakeMap(typ)
if len(strings.TrimSpace(value)) != 0 {
pairs := strings.Split(value, ";")
for _, pair := range pairs {
kvpair := strings.Split(pair, ":")
if len(kvpair) != 2 {
return fmt.Errorf("invalid map item: %q", pair)
}
k := reflect.New(typ.Key()).Elem()
err := processField(kvpair[0], k)
if err != nil {
return err
}
v := reflect.New(typ.Elem()).Elem()
err = processField(kvpair[1], v)
if err != nil {
return err
}
mp.SetMapIndex(k, v)
}
}
field.Set(mp)
}
return nil
}
func interfaceFrom(field reflect.Value, fn func(interface{}, *bool)) {
// It may be impossible for a struct field to fail this check.
if !field.CanInterface() {
return
}
var ok bool
fn(field.Interface(), &ok)
if !ok && field.CanAddr() {
fn(field.Addr().Interface(), &ok)
}
}
// Setter is implemented by types can self-deserialize values.
// Any type that implements flag.Value also implements Setter.
type Setter interface {
Set(value string) error
}
func setterFrom(field reflect.Value) (s Setter) {
interfaceFrom(field, func(v interface{}, ok *bool) { s, *ok = v.(Setter) })
return s
}
func textUnmarshaler(field reflect.Value) (t encoding.TextUnmarshaler) {
interfaceFrom(field, func(v interface{}, ok *bool) { t, *ok = v.(encoding.TextUnmarshaler) })
return t
}
func binaryUnmarshaler(field reflect.Value) (b encoding.BinaryUnmarshaler) {
interfaceFrom(field, func(v interface{}, ok *bool) { b, *ok = v.(encoding.BinaryUnmarshaler) })
return b
}
const (
classLower int = iota
classUpper
classNumber
classOther
)
func charClass(r rune) int {
switch {
case unicode.IsLower(r):
return classLower
case unicode.IsUpper(r):
return classUpper
case unicode.IsDigit(r):
return classNumber
}
return classOther
}

205
vendor/github.com/ardanlabs/conf/sources.go generated vendored Normal file
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@ -0,0 +1,205 @@
package conf
import (
"errors"
"fmt"
"os"
"strings"
)
// env is a source for environmental variables.
type env struct {
m map[string]string
}
// newSourceEnv accepts a namespace and parses the environment into a Env for
// use by the configuration package.
func newSourceEnv(namespace string) *env {
m := make(map[string]string)
// Create the uppercase version to meet the standard {NAMESPACE_} format.
// If the namespace is empty, remove the _ from the beginning of the string.
uspace := fmt.Sprintf("%s_", strings.ToUpper(namespace))
if namespace == "" {
uspace = uspace[1:]
}
// Loop and match each variable using the uppercase namespace.
for _, val := range os.Environ() {
if !strings.HasPrefix(val, uspace) {
continue
}
idx := strings.Index(val, "=")
m[strings.ToUpper(strings.TrimPrefix(val[0:idx], uspace))] = val[idx+1:]
}
return &env{m: m}
}
// Source implements the confg.Sourcer interface. It returns the stringfied value
// stored at the specified key from the environment.
func (e *env) Source(fld Field) (string, bool) {
k := strings.ToUpper(strings.Join(fld.EnvKey, `_`))
v, ok := e.m[k]
return v, ok
}
// envUsage constructs a usage string for the environment variable.
func envUsage(namespace string, fld Field) string {
uspace := strings.ToUpper(namespace) + "_" + strings.ToUpper(strings.Join(fld.EnvKey, `_`))
if namespace == "" {
uspace = uspace[1:]
}
return "$" + uspace
}
// =============================================================================
// ErrHelpWanted provides an indication help was requested.
var ErrHelpWanted = errors.New("help wanted")
// ErrVersionWanted provides an indication version was requested.
var ErrVersionWanted = errors.New("version wanted")
// flag is a source for command line arguments.
type flag struct {
m map[string]string
args []string
}
// newSourceFlag parsing a string of command line arguments. NewFlag will return
// errHelpWanted, if the help flag is identifyed. This code is adapted
// from the Go standard library flag package.
func newSourceFlag(args []string) (*flag, error) {
m := make(map[string]string)
if len(args) != 0 {
for {
if len(args) == 0 {
break
}
// Look at the next arg.
s := args[0]
// If it's too short or doesn't begin with a `-`, assume we're at
// the end of the flags.
if len(s) < 2 || s[0] != '-' {
break
}
numMinuses := 1
if s[1] == '-' {
numMinuses++
if len(s) == 2 { // "--" terminates the flags
args = args[1:]
break
}
}
name := s[numMinuses:]
if len(name) == 0 || name[0] == '-' || name[0] == '=' {
return nil, fmt.Errorf("bad flag syntax: %s", s)
}
// It's a flag. Does it have an argument?
args = args[1:]
hasValue := false
value := ""
for i := 1; i < len(name); i++ { // equals cannot be first
if name[i] == '=' {
value = name[i+1:]
hasValue = true
name = name[0:i]
break
}
}
if name == "help" || name == "h" || name == "?" {
return nil, ErrHelpWanted
}
if name == "version" || name == "v" {
return nil, ErrVersionWanted
}
// If we don't have a value yet, it's possible the flag was not in the
// -flag=value format which means it might still have a value which would be
// the next argument, provided the next argument isn't a flag.
if !hasValue {
if len(args) > 0 && len(args[0]) > 0 && args[0][0] != '-' {
// Doesn't look like a flag. Must be a value.
value, args = args[0], args[1:]
} else {
// We assume this is a boolean flag.
value = "true"
}
}
// Store the flag/value pair.
m[name] = value
}
}
return &flag{m: m, args: args}, nil
}
// Source implements the confg.Sourcer interface. Returns the stringfied value
// stored at the specified key from the flag source.
func (f *flag) Source(fld Field) (string, bool) {
if fld.Options.ShortFlagChar != 0 {
flagKey := fld.Options.ShortFlagChar
k := strings.ToLower(string(flagKey))
if val, found := f.m[k]; found {
return val, found
}
}
k := strings.ToLower(strings.Join(fld.FlagKey, `-`))
val, found := f.m[k]
return val, found
}
// flagUsage constructs a usage string for the flag argument.
func flagUsage(fld Field) string {
usage := "--" + strings.ToLower(strings.Join(fld.FlagKey, `-`))
if fld.Options.ShortFlagChar != 0 {
flagKey := []string{string(fld.Options.ShortFlagChar)}
usage += "/-" + strings.ToLower(strings.Join(flagKey, `-`))
}
return usage
}
/*
Portions Copyright (c) 2009 The Go Authors. 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.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
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
OWNER 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.
*/

184
vendor/github.com/ardanlabs/conf/usage.go generated vendored Normal file
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@ -0,0 +1,184 @@
package conf
import (
"fmt"
"os"
"path"
"reflect"
"strings"
"text/tabwriter"
)
const versionKey = `SVN`
const descKey = `Desc`
func containsField(fields []Field, name string) bool {
for i := range fields {
if name == fields[i].Name {
return true
}
}
return false
}
func fmtUsage(namespace string, fields []Field) string {
var sb strings.Builder
fields = append(fields, Field{
Name: "help",
BoolField: true,
Field: reflect.ValueOf(true),
FlagKey: []string{"help"},
Options: FieldOptions{
ShortFlagChar: 'h',
Help: "display this help message",
}})
if containsField(fields, versionKey) {
fields = append(fields, Field{
Name: "version",
BoolField: true,
Field: reflect.ValueOf(true),
FlagKey: []string{"version"},
Options: FieldOptions{
ShortFlagChar: 'v',
Help: "display version information",
}})
}
_, file := path.Split(os.Args[0])
fmt.Fprintf(&sb, "Usage: %s [options] [arguments]\n\n", file)
fmt.Fprintln(&sb, "OPTIONS")
w := new(tabwriter.Writer)
w.Init(&sb, 0, 4, 2, ' ', tabwriter.TabIndent)
for _, fld := range fields {
// Skip printing usage info for fields that just hold arguments.
if fld.Field.Type() == argsT {
continue
}
// Do not display version fields SVN and Description
if fld.Name == versionKey || fld.Name == descKey {
continue
}
fmt.Fprintf(w, " %s", flagUsage(fld))
// Do not display env vars for help since they aren't respected.
if fld.Name != "help" && fld.Name != "version" {
fmt.Fprintf(w, "/%s", envUsage(namespace, fld))
}
typeName, help := getTypeAndHelp(&fld)
// Do not display type info for help because it would show <bool> but our
// parsing does not really treat --help as a boolean field. Its presence
// always indicates true even if they do --help=false.
if fld.Name != "help" && fld.Name != "version" {
fmt.Fprintf(w, "\t%s", typeName)
}
fmt.Fprintf(w, "\t%s\n", getOptString(fld))
if help != "" {
fmt.Fprintf(w, " %s\n", help)
}
}
w.Flush()
return sb.String()
}
// getTypeAndHelp extracts the type and help message for a single field for
// printing in the usage message. If the help message contains text in
// single quotes ('), this is assumed to be a more specific "type", and will
// be returned as such. If there are no back quotes, it attempts to make a
// guess as to the type of the field. Boolean flags are not printed with a
// type, manually-specified or not, since their presence is equated with a
// 'true' value and their absence with a 'false' value. If a type cannot be
// determined, it will simply give the name "value". Slices will be annotated
// as "<Type>,[Type...]", where "Type" is whatever type name was chosen.
// (adapted from package flag).
func getTypeAndHelp(fld *Field) (name string, usage string) {
// Look for a single-quoted name.
usage = fld.Options.Help
for i := 0; i < len(usage); i++ {
if usage[i] == '\'' {
for j := i + 1; j < len(usage); j++ {
if usage[j] == '\'' {
name = usage[i+1 : j]
usage = usage[:i] + name + usage[j+1:]
}
}
break // Only one single quote; use type name.
}
}
var isSlice bool
if fld.Field.IsValid() {
t := fld.Field.Type()
// If it's a pointer, we want to deref.
if t.Kind() == reflect.Ptr {
t = t.Elem()
}
// If it's a slice, we want the type of the slice elements.
if t.Kind() == reflect.Slice {
t = t.Elem()
isSlice = true
}
// If no explicit name was provided, attempt to get the type
if name == "" {
switch t.Kind() {
case reflect.Bool:
name = "bool"
case reflect.Float32, reflect.Float64:
name = "float"
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
typ := fld.Field.Type()
if typ.PkgPath() == "time" && typ.Name() == "Duration" {
name = "duration"
} else {
name = "int"
}
case reflect.String:
name = "string"
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
name = "uint"
default:
name = "value"
}
}
}
switch {
case isSlice:
name = fmt.Sprintf("<%s>,[%s...]", name, name)
case name != "":
name = fmt.Sprintf("<%s>", name)
default:
}
return
}
func getOptString(fld Field) string {
opts := make([]string, 0, 3)
if fld.Options.Required {
opts = append(opts, "required")
}
if fld.Options.Noprint {
opts = append(opts, "noprint")
}
if fld.Options.DefaultVal != "" {
opts = append(opts, fmt.Sprintf("default: %s", fld.Options.DefaultVal))
}
if len(opts) > 0 {
return fmt.Sprintf("(%s)", strings.Join(opts, `,`))
}
return ""
}