main.go
2.55 KB
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package main
import (
"bytes"
"encoding/hex"
"flag"
"fmt"
"io"
"os"
"strings"
"text/template"
"time"
"github.com/segmentio/ksuid"
)
var (
count int
format string
tpltxt string
verbose bool
)
func init() {
flag.IntVar(&count, "n", 1, "Number of KSUIDs to generate when called with no other arguments.")
flag.StringVar(&format, "f", "string", "One of string, inspect, time, timestamp, payload, raw, or template.")
flag.StringVar(&tpltxt, "t", "", "The Go template used to format the output.")
flag.BoolVar(&verbose, "v", false, "Turn on verbose mode.")
}
func main() {
flag.Parse()
args := flag.Args()
var print func(ksuid.KSUID)
switch format {
case "string":
print = printString
case "inspect":
print = printInspect
case "time":
print = printTime
case "timestamp":
print = printTimestamp
case "payload":
print = printPayload
case "raw":
print = printRaw
case "template":
print = printTemplate
default:
fmt.Println("Bad formatting function:", format)
os.Exit(1)
}
if len(args) == 0 {
for i := 0; i < count; i++ {
args = append(args, ksuid.New().String())
}
}
var ids []ksuid.KSUID
for _, arg := range args {
id, err := ksuid.Parse(arg)
if err != nil {
fmt.Printf("Error when parsing %q: %s\n\n", arg, err)
flag.PrintDefaults()
os.Exit(1)
}
ids = append(ids, id)
}
for _, id := range ids {
if verbose {
fmt.Printf("%s: ", id)
}
print(id)
}
}
func printString(id ksuid.KSUID) {
fmt.Println(id.String())
}
func printInspect(id ksuid.KSUID) {
const inspectFormat = `
REPRESENTATION:
String: %v
Raw: %v
COMPONENTS:
Time: %v
Timestamp: %v
Payload: %v
`
fmt.Printf(inspectFormat,
id.String(),
strings.ToUpper(hex.EncodeToString(id.Bytes())),
id.Time(),
id.Timestamp(),
strings.ToUpper(hex.EncodeToString(id.Payload())),
)
}
func printTime(id ksuid.KSUID) {
fmt.Println(id.Time())
}
func printTimestamp(id ksuid.KSUID) {
fmt.Println(id.Timestamp())
}
func printPayload(id ksuid.KSUID) {
os.Stdout.Write(id.Payload())
}
func printRaw(id ksuid.KSUID) {
os.Stdout.Write(id.Bytes())
}
func printTemplate(id ksuid.KSUID) {
b := &bytes.Buffer{}
t := template.Must(template.New("").Parse(tpltxt))
t.Execute(b, struct {
String string
Raw string
Time time.Time
Timestamp uint32
Payload string
}{
String: id.String(),
Raw: strings.ToUpper(hex.EncodeToString(id.Bytes())),
Time: id.Time(),
Timestamp: id.Timestamp(),
Payload: strings.ToUpper(hex.EncodeToString(id.Payload())),
})
b.WriteByte('\n')
io.Copy(os.Stdout, b)
}