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file.go
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file.go
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package util
import (
"bufio"
"errors"
"io"
"os"
"path/filepath"
"strings"
)
func FileExists(path string) (bool, error) {
fi, err := os.Stat(path)
if err == nil {
if fi.Mode()&os.ModeType == 0 {
return true, nil
}
return false, errors.New(path + " exists but is not regular file")
}
if os.IsNotExist(err) {
return false, nil
}
return false, err
}
func CurrentDir() string {
path, err := os.Executable()
if err != nil {
return ""
}
return filepath.Dir(path)
}
func DirFileList(dir string) ([]string, error) {
list, err := os.ReadDir(dir)
if err != nil {
return nil, err
}
var files []string
for _, v := range list {
if !v.IsDir() {
files = append(files, v.Name())
}
}
return files, nil
}
func WriteToTemp(filename string, content []byte) (namePath string, err error) {
tf, err := os.CreateTemp("", filename)
if err != nil {
return "", err
}
if _, err := tf.Write(content); err != nil {
return "", err
}
return tf.Name(), tf.Close()
}
func ReadFileLines(file string) ([]string, error) {
if e, err := FileExists(file); !e || err != nil {
return nil, err
}
f, err := os.Open(file)
if err != nil {
return nil, err
}
defer f.Close()
lines := make([]string, 0, 16)
r := bufio.NewReader(f)
for {
line, _, err := r.ReadLine()
if err == io.EOF {
break
} else if err != nil {
return nil, err
}
lines = append(lines, string(line))
}
return lines, nil
}
func ReadFileLinesMap(file string) (map[string]struct{}, error) {
lines, err := ReadFileLines(file)
if err != nil {
return nil, err
}
m := make(map[string]struct{})
for _, line := range lines {
line = strings.TrimSpace(line)
if line != "" {
m[line] = struct{}{}
}
}
return m, nil
}