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utils.go
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/
utils.go
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package internal
import (
"bufio"
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"os"
"strconv"
"strings"
)
var (
ErrInvalidContext = errors.New("invalid context")
ErrBadVersion = errors.New("malformed version")
)
const (
VersionFormat = "%019d"
)
func Atoi(str string) int {
num, err := strconv.Atoi(str)
if err != nil {
panic(err)
}
return num
}
func VersionNumToStr(version int) string {
return fmt.Sprintf(VersionFormat, version)
}
func ReadStdin() string {
reader := bufio.NewReader(os.Stdin)
input, err := io.ReadAll(reader)
if err != nil {
panic(err)
}
return strings.TrimRight(string(input), "\n")
}
func ReadFile(filename string) (string, error) {
content, err := os.ReadFile(filename)
if err != nil {
//nolint:wrapcheck
return "", err
}
return string(content), nil
}
func JSONMarshal(t interface{}) ([]byte, error) {
buffer := &bytes.Buffer{}
encoder := json.NewEncoder(buffer)
encoder.SetEscapeHTML(false)
encoder.SetIndent("", " ")
err := encoder.Encode(t)
return buffer.Bytes(), err
}
func MaxKeyLen(items map[*string]*string) int {
max := 0
for key := range items {
keyLen := len(*key)
if keyLen > max {
max = keyLen
}
}
return max
}
func LookupEnvDefault(defaultVal string, envVars ...string) string {
for _, envVar := range envVars {
if val, ok := os.LookupEnv(envVar); ok {
return val
}
}
return defaultVal
}
func CheckVersion(version *string) error {
if *version != "" {
parsed, err := strconv.Atoi(*version)
if err != nil {
return fmt.Errorf("%w: %q", ErrBadVersion, *version)
}
*version = fmt.Sprintf(VersionFormat, parsed)
}
return nil
}
func ParseContext(strs []string) (map[string]string, error) {
context := map[string]string{}
for _, ctx := range strs {
kv := strings.SplitN(ctx, "=", 2)
if len(kv) < 2 || kv[0] == "" || kv[1] == "" {
return nil, fmt.Errorf("%w: %q", ErrInvalidContext, ctx)
}
context[kv[0]] = kv[1]
}
return context, nil
}