package install
import (
"bufio"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
)
func lineInFile(name string, lookFor string) bool {
f, err := os.Open(name)
if err != nil {
return false
}
defer f.Close()
r := bufio.NewReader(f)
prefix := []byte{}
for {
line, isPrefix, err := r.ReadLine()
if err == io.EOF {
return false
}
if err != nil {
return false
}
if isPrefix {
prefix = append(prefix, line...)
continue
}
line = append(prefix, line...)
if string(line) == lookFor {
return true
}
prefix = prefix[:0]
}
}
func createFile(name string, content string) error {
// make sure file directory exists
if err := os.MkdirAll(filepath.Dir(name), 0775); err != nil {
return err
}
// create the file
f, err := os.Create(name)
if err != nil {
return err
}
defer f.Close()
// write file content
_, err = f.WriteString(fmt.Sprintf("%s\n", content))
return err
}
func appendToFile(name string, content string) error {
f, err := os.OpenFile(name, os.O_RDWR|os.O_APPEND, 0)
if err != nil {
return err
}
defer f.Close()
_, err = f.WriteString(fmt.Sprintf("\n%s\n", content))
return err
}
func removeFromFile(name string, content string) error {
backup := name + ".bck"
err := copyFile(name, backup)
if err != nil {
return err
}
temp, err := removeContentToTempFile(name, content)
if err != nil {
return err
}
err = copyFile(temp, name)
if err != nil {
return err
}
return os.Remove(backup)
}
func removeContentToTempFile(name, content string) (string, error) {
rf, err := os.Open(name)
if err != nil {
return "", err
}
defer rf.Close()
wf, err := ioutil.TempFile("/tmp", "complete-")
if err != nil {
return "", err
}
defer wf.Close()
r := bufio.NewReader(rf)
prefix := []byte{}
for {
line, isPrefix, err := r.ReadLine()
if err == io.EOF {
break
}
if err != nil {
return "", err
}
if isPrefix {
prefix = append(prefix, line...)
continue
}
line = append(prefix, line...)
str := string(line)
if str == content {
continue
}
_, err = wf.WriteString(str + "\n")
if err != nil {
return "", err
}
prefix = prefix[:0]
}
return wf.Name(), nil
}
func copyFile(src string, dst string) error {
in, err := os.Open(src)
if err != nil {
return err
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return err
}
defer out.Close()
_, err = io.Copy(out, in)
return err
}
