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