// Append a file. alert.Exit on failure
func Append(filename string, label string) *os.File {
file, err := os.OpenFile(filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0666)
if err != nil {
alert.Exit("Can't append " + label + " file: " + filename + ", " + err.Error())
}
return file
}
// ReadFile reads a file and returns the contents as a string. alert.Exit on failure.
func ReadFile(filename string, label string) string {
bytes, err := ioutil.ReadFile(filename)
if err != nil {
alert.Exit("Can't read " + label + " file: " + filename + ", " + err.Error())
}
return string(bytes)
}
// Create a file. alert.Exit on failure.
func Create(filename string, label string) *os.File {
file, err := os.Create(filename)
if err != nil {
alert.Exit("Can't create " + label + " file: " + filename + ", " + err.Error())
}
return file
}
// Open a file. alert.Exit on failure.
func Open(filename string) *os.File {
file, err := os.Open(filename)
if err != nil {
alert.Exit("Can't open file: " + filename + ", " + err.Error())
}
return file
}
// ParseFloat64 parses a string and returns a float64. On failure it displays
// an error message and calls exit.
func ParseFloat64(str string) float64 {
result, err := strconv.ParseFloat(str, 64)
if err != nil {
alert.Exit("Failed to parse float64: " + str + ", " + err.Error())
}
return result
}
// ParseUint32 parses a string and returns a uint32. On failure it displays
// an error message and calls exit.
func ParseUint32(str string) uint32 {
result, err := strconv.ParseUint(str, 10, 32)
if err != nil {
alert.Exit("Failed to parse uint32: " + str + ", " + err.Error())
}
return uint32(result)
}
// ReadYAML reads a YAML file into an arbitrary structure.
func ReadYAML(filename string, config interface{}) {
data := ReadFile(filename, "YAML")
err := yaml.Unmarshal([]byte(data), config)
if err != nil {
alert.Exit("Can't unmarshal " + filename + " into config: " + err.Error())
}
}
// WriteFile writes a string to file. If a file with that name exists,
// it will overwrite it. alert.Exit on failure.
func WriteFile(filename, body, label string) {
err := ioutil.WriteFile(filename, []byte(body), 0644)
if err != nil {
alert.Exit("Can't create " + label + " file: " + filename + ", " + err.Error())
}
}