77 lines
1.8 KiB
Go
77 lines
1.8 KiB
Go
package settings
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import (
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"log"
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"math/rand"
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"os"
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"path/filepath"
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"strings"
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"github.com/tockins/realize/style"
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"time"
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)
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const (
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letterIdxBits = 6 // 6 bits to represent a letter index
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letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
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letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
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letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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)
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// Wdir return the current working Directory
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func (s Settings) Wdir() string {
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dir, err := os.Getwd()
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s.Validate(err)
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return filepath.Base(dir)
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}
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// Validate checks a fatal error
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func (s Settings) Validate(err error) error {
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if err != nil {
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s.Fatal(err, "")
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}
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return nil
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}
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// Fatal prints a fatal error with its additional messages
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func (s Settings) Fatal(err error, msg ...interface{}) {
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if len(msg) > 0 && err != nil {
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log.Fatalln(style.Red.Regular(msg...), err.Error())
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} else if err != nil {
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log.Fatalln(err.Error())
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}
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}
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// Name return the project name or the path of the working dir
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func (s Settings) Name(name string, path string) string {
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if name == "" && path == "" {
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return s.Wdir()
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} else if path != "/" {
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return filepath.Base(path)
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}
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return name
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}
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// Path cleaner
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func (s Settings) Path(path string) string {
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return strings.Replace(filepath.Clean(path), "\\", "/", -1)
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}
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// Rand is used for generate a random string
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func Rand(n int) string {
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src := rand.NewSource(time.Now().UnixNano())
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b := make([]byte, n)
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for i, cache, remain := n-1, src.Int63(), letterIdxMax; i >= 0; {
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if remain == 0 {
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cache, remain = src.Int63(), letterIdxMax
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}
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if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
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b[i] = letterBytes[idx]
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i--
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}
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cache >>= letterIdxBits
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remain--
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}
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return string(b)
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}
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