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write.go
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write.go
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package osutil
import (
"bufio"
"errors"
"fmt"
"io"
"os"
"github.com/grokify/mogo/encoding/jsonutil"
"github.com/grokify/mogo/io/ioutil"
)
func WriteFileJSON(filepath string, data any, perm os.FileMode, prefix, indent string) error {
bytes, err := jsonutil.MarshalSimple(data, prefix, indent)
if err != nil {
return err
}
return os.WriteFile(filepath, bytes, perm)
}
var (
ErrWriterNotInitialized = errors.New("bufio.Writer not initialized")
ErrFileNotInitialized = errors.New("os.File not initialized")
)
type FileWriter struct {
File *os.File
Writer *bufio.Writer
}
func NewFileWriter(path string) (FileWriter, error) {
fw := FileWriter{}
file, err := os.Create(path)
if err != nil {
return fw, err
}
fw.File = file
fw.Writer = bufio.NewWriter(file)
return fw, nil
}
func (fw *FileWriter) WriteBytes(b []byte) (int, error) {
return fw.Writer.Write(b)
}
func (fw *FileWriter) WriteString(addLinefeed bool, s ...string) (int, error) {
n := 0
for _, si := range s {
if addLinefeed {
si += "\n"
}
ni, err := fw.Writer.WriteString(si)
if err != nil {
return n, err
}
n += ni
}
return n, nil
}
func (fw *FileWriter) WriteStringf(addLinefeed bool, format string, a ...any) (int, error) {
lf := ""
if addLinefeed {
lf = "\n"
}
return fw.Writer.WriteString(fmt.Sprintf(format, a...) + lf)
}
func (fw *FileWriter) Close() error {
err := fw.Writer.Flush()
if err != nil {
return err
}
return fw.File.Close()
}
func WriteFileReader(filename string, r io.Reader) error {
// https://stackoverflow.com/questions/1821811/how-to-read-write-from-to-a-file-using-go
// open output file
// fo, err := os.OpenFile(filename, os.O_APPEND|os.O_WRONLY, perm)
fo, err := os.Create(filename)
if err != nil {
return err
}
// close fo on exit and check for its returned error
defer func() {
if err := fo.Close(); err != nil {
panic(err)
}
}()
w := bufio.NewWriter(fo)
return ioutil.Write(w, r)
}