ntfy/util/util.go

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package util
import (
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"errors"
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"fmt"
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"math/rand"
"os"
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"strings"
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"sync"
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"time"
)
const (
randomStringCharset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
)
var (
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random = rand.New(rand.NewSource(time.Now().UnixNano()))
randomMutex = sync.Mutex{}
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errInvalidPriority = errors.New("unknown priority")
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)
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// FileExists checks if a file exists, and returns true if it does
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func FileExists(filename string) bool {
stat, _ := os.Stat(filename)
return stat != nil
}
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// InStringList returns true if needle is contained in haystack
func InStringList(haystack []string, needle string) bool {
for _, s := range haystack {
if s == needle {
return true
}
}
return false
}
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// RandomString returns a random string with a given length
func RandomString(length int) string {
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randomMutex.Lock() // Who would have thought that random.Intn() is not thread-safe?!
defer randomMutex.Unlock()
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b := make([]byte, length)
for i := range b {
b[i] = randomStringCharset[random.Intn(len(randomStringCharset))]
}
return string(b)
}
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// DurationToHuman converts a duration to a human readable format
func DurationToHuman(d time.Duration) (str string) {
if d == 0 {
return "0"
}
d = d.Round(time.Second)
days := d / time.Hour / 24
if days > 0 {
str += fmt.Sprintf("%dd", days)
}
d -= days * time.Hour * 24
hours := d / time.Hour
if hours > 0 {
str += fmt.Sprintf("%dh", hours)
}
d -= hours * time.Hour
minutes := d / time.Minute
if minutes > 0 {
str += fmt.Sprintf("%dm", minutes)
}
d -= minutes * time.Minute
seconds := d / time.Second
if seconds > 0 {
str += fmt.Sprintf("%ds", seconds)
}
return
}
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func ParsePriority(priority string) (int, error) {
switch strings.ToLower(priority) {
case "":
return 0, nil
case "1", "min":
return 1, nil
case "2", "low":
return 2, nil
case "3", "default":
return 3, nil
case "4", "high":
return 4, nil
case "5", "max", "urgent":
return 5, nil
default:
return 0, errInvalidPriority
}
}
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// ExpandHome replaces "~" with the user's home directory
func ExpandHome(path string) string {
return os.ExpandEnv(strings.ReplaceAll(path, "~", "$HOME"))
}