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fileutils.go
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fileutils.go
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package fileutils
import (
"bufio"
"fmt"
"os"
"strings"
)
// Exists returns whether or not the given file exists
func Exists(p string) bool {
if _, err := os.Stat(p); err == nil {
return true
}
return false
}
// WriteData writes data to the given path, creating the file if necessary.
func WriteData(path string, data []byte) {
f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0600)
if err != nil {
fmt.Println(err)
}
// TODO: check for Close() errors
// https://github.com/ncw/swift/blob/master/swift.go#L170
defer f.Close()
_, err = f.Write(data)
if err != nil {
fmt.Println(err)
}
}
// ReadData returns file data as an array of lines from the file.
func ReadData(p string) *[]string {
f, err := os.Open(p)
if err != nil {
return nil
}
defer f.Close()
lines := []string{}
scanner := bufio.NewScanner(f)
for scanner.Scan() {
lines = append(lines, scanner.Text())
}
if err := scanner.Err(); err != nil {
return nil
}
return &lines
}
// RemoveLine searches for the line that starts with the given value and,
// if found, removes it and saves the updated file.
func RemoveLine(p, startsWith string) {
f, err := os.Open(p)
if err != nil {
return
}
defer f.Close()
var outText string
found := false
scanner := bufio.NewScanner(f)
for scanner.Scan() {
if strings.HasPrefix(scanner.Text(), startsWith) {
found = true
} else {
outText += scanner.Text() + string('\n')
}
}
if err := scanner.Err(); err != nil {
return
}
if found {
WriteData(p, []byte(outText))
}
}
// FindLine searches the given file for a line that begins with the given
// string.
func FindLine(p, startsWith string) string {
f, err := os.Open(p)
if err != nil {
return ""
}
defer f.Close()
scanner := bufio.NewScanner(f)
for scanner.Scan() {
if strings.HasPrefix(scanner.Text(), startsWith) {
return scanner.Text()
}
}
if err := scanner.Err(); err != nil {
return ""
}
return ""
}

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