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package oi
import (
"errors"
"fmt"
"io"
"os"
"path/filepath"
"strings"
"time"
"golang.org/x/exp/rand"
)
var ErrNotFound = errors.New("no file/entry found")
func EnsureDir(dir string) error {
if _, err := os.Stat(dir); os.IsNotExist(err) {
return os.MkdirAll(dir, os.ModePerm)
}
return nil
}
func EnsureParentDir(dir string) error {
return EnsureDir(filepath.Dir(dir))
}
func ReadDirCh[T any](dir string, cb func(file os.DirEntry) (T, bool)) (chan T, error) {
ch := make(chan T)
if err := EnsureDir(dir); err != nil {
return ch, err
}
files, err := os.ReadDir(dir)
if err != nil {
return ch, err
}
go func() {
defer close(ch)
for _, file := range files {
if val, ok := cb(file); ok {
ch <- val
}
}
}()
return ch, nil
}
func ReadDir[T any](dir string, cb func(file os.DirEntry) (T, bool)) ([]T, error) {
var results []T
ch, err := ReadDirCh(dir, cb)
if err != nil {
return results, err
}
for file := range ch {
results = append(results, file)
}
return results, nil
}
func ForeachDirEntry(dir string, cb func(file os.DirEntry) error) error {
if err := EnsureDir(dir); err != nil {
return err
}
files, err := os.ReadDir(dir)
if err != nil {
return err
}
var errs []error
for _, file := range files {
if err := cb(file); err != nil {
errs = append(errs, err)
}
}
return errors.Join(errs...)
}
func ReadDirRandom[T any](dir string, cb func(file os.DirEntry) (T, bool)) (T, error) {
results, err := ReadDir(dir, cb)
if err != nil {
var zero T
return zero, err
}
if len(results) == 0 {
var zero T
return zero, ErrNotFound
}
rand.Seed(uint64(time.Now().UnixNano()))
return results[rand.Intn(len(results))], nil
}
func IsRegular(path string) bool {
stat, err := os.Stat(path)
if err != nil {
return false
}
return stat.Mode().IsRegular()
}
func CopyFile(srcPath, dstPath string) error {
if !IsRegular(srcPath) {
return fmt.Errorf("%s is not a regular file", srcPath)
}
source, err := os.Open(srcPath)
if err != nil {
return err
}
defer source.Close()
if err := EnsureParentDir(dstPath); err != nil {
return err
}
destination, err := os.Create(dstPath)
if err != nil {
return err
}
defer destination.Close()
_, err = io.Copy(destination, source)
return err
}
func Rename(srcPath, dstPath string) error {
if err := EnsureParentDir(dstPath); err != nil {
return err
}
return os.Rename(srcPath, dstPath)
}
func SlurpAndTrim(filePath string) (string, error) {
bytes, err := os.ReadFile(filePath)
if err != nil {
return "", err
}
return strings.TrimSpace(string(bytes)), nil
}
func WriteFile(filePath, content string) error {
tmpFilePath := fmt.Sprintf("%s.tmp", filePath)
file, err := os.OpenFile(tmpFilePath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return err
}
defer file.Close()
_, err = file.WriteString(content)
if err != nil {
return err
}
return os.Rename(tmpFilePath, filePath)
}
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