/
utils.go
132 lines (114 loc) · 2.66 KB
/
utils.go
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package main
import (
"fmt"
"io"
"log"
"math/rand"
"strings"
"unicode"
)
func closeWith(closer io.Closer, handler func(error)) {
err := closer.Close()
if err != nil {
handler(err)
}
}
func camelToSnake(s string) string {
const underscore = '_'
var result strings.Builder
result.Grow(len(s) + 5)
var prev rune
for i, r := range s {
if i > 0 && prev != underscore && r != underscore && unicode.IsUpper(r) {
result.WriteRune(underscore)
}
result.WriteRune(unicode.ToUpper(r))
prev = r
}
return result.String()
}
func fastRandString(n int) string {
const letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
seed := rand.Intn(len(letters)*len(letters)) + 1
b := make([]byte, n)
for i := range b {
b[i] = letters[(seed+i)%len(letters)]
}
return string(b)
}
type (
envDocItemBuilderOp func(*envDocItemsBuilder)
envDocItemsBuilder struct {
envPrefix string
names []string
doc string
opts EnvVarOptions
children []*EnvDocItem
}
)
func withEnvDocItemEnvPrefix(envPrefix string) envDocItemBuilderOp {
return func(b *envDocItemsBuilder) {
b.envPrefix = envPrefix
}
}
func withEnvDocItemDoc(doc string) envDocItemBuilderOp {
return func(b *envDocItemsBuilder) {
b.doc = doc
}
}
func withEnvDocItemOpts(opts EnvVarOptions) envDocItemBuilderOp {
return func(b *envDocItemsBuilder) {
b.opts = opts
}
}
func withEnvDocItemAddChildren(children []*EnvDocItem) envDocItemBuilderOp {
return func(b *envDocItemsBuilder) {
b.children = append(b.children, children...)
}
}
func withEnvDocItemNames(names ...string) envDocItemBuilderOp {
return func(b *envDocItemsBuilder) {
b.names = names
}
}
var withEnvDocEmptyNames = withEnvDocItemNames("")
func (b *envDocItemsBuilder) apply(op ...envDocItemBuilderOp) *envDocItemsBuilder {
for _, o := range op {
o(b)
}
return b
}
func (b *envDocItemsBuilder) items() []*EnvDocItem {
items := make([]*EnvDocItem, len(b.names))
for i, name := range b.names {
item := &EnvDocItem{
Doc: b.doc,
Opts: b.opts,
Children: b.children,
}
if name != "" {
item.Name = fmt.Sprintf("%s%s", b.envPrefix, name)
}
items[i] = item
}
return items
}
func (b *envDocItemsBuilder) GoString() string {
return fmt.Sprintf("envDocItemsBuilder{envPrefix: %q, names: %q, doc: %q, opts: %v, children: %v}",
b.envPrefix, b.names, b.doc, b.opts, b.children)
}
func debugBuilder(l *log.Logger, prefix string, b *envDocItemsBuilder) {
l.Printf("%s: %s", prefix, b.GoString())
}
func strConcat(s ...string) string {
var b strings.Builder
var size int
for _, v := range s {
size += len(v)
}
b.Grow(size)
for _, v := range s {
b.WriteString(v)
}
return b.String()
}