forked from laher/someutils
/
tee.go
92 lines (78 loc) · 1.94 KB
/
tee.go
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package some
import (
"github.com/nuvolaris/someutils"
"github.com/laher/uggo"
"io"
"os"
)
func init() {
someutils.RegisterPipable(func() someutils.CliPipable { return new(SomeTee) })
}
// SomeTee represents and performs a `tee` invocation
type SomeTee struct {
isAppend bool
flag int
args []string
}
// Name() returns the name of the util
func (tee *SomeTee) Name() string {
return "tee"
}
// TODO: add validation here
// ParseFlags parses flags from a commandline []string
func (tee *SomeTee) ParseFlags(call []string, errPipe io.Writer) (error, int) {
flagSet := uggo.NewFlagSetDefault("tee", "[OPTION]... [FILE]...", someutils.VERSION)
flagSet.SetOutput(errPipe)
flagSet.AliasedBoolVar(&tee.isAppend, []string{"a", "append"}, false, "Append instead of overwrite")
err, code := flagSet.ParsePlus(call[1:])
if err != nil {
return err, code
}
tee.args = flagSet.Args()
return nil, 0
}
// Exec actually performs the tee
func (tee *SomeTee) Invoke(invocation *someutils.Invocation) (error, int) {
invocation.ErrPipe.Drain()
invocation.AutoHandleSignals()
flag := os.O_CREATE
if tee.isAppend {
flag = flag | os.O_APPEND
}
writeables := uggo.ToWriteableOpeners(tee.args, flag, 0666)
files, err := uggo.OpenAll(writeables)
if err != nil {
return err, 1
}
writers := []io.Writer{invocation.MainPipe.Out}
for _, file := range files {
writers = append(writers, file)
}
multiwriter := io.MultiWriter(writers...)
_, err = io.Copy(multiwriter, invocation.MainPipe.In)
if err != nil {
return err, 1
}
for _, file := range files {
err = file.Close()
if err != nil {
return err, 1
}
}
return nil, 0
}
// Factory for *SomeTee
func NewTee() *SomeTee {
return new(SomeTee)
}
// Factory for *SomeTee
func Tee(args ...string) *SomeTee {
tee := NewTee()
tee.args = args
return tee
}
// CLI invocation for *SomeTee
func TeeCli(call []string) (error, int) {
util := new(SomeTee)
return someutils.StdInvoke((util), call)
}