func Example() {
p, err := nxpipe.Output(nxpipe.Line(
nxpipe.Script(
nxpipe.Exec("echo", "-n", "hello"),
nxpipe.Exec("echo", " world"),
),
nxpipe.Exec("sed", `s/o/O/g`),
))
if err != nil {
fmt.Printf("error: %v", err)
return
}
fmt.Printf("%s\n", p)
// Output: hellO wOrld
}
func BenchmarkPipingLine(b *testing.B) {
b.SetBytes(benchmarkPipingSize)
fpath, err := mkRandFile(benchmarkPipingSize)
if err != nil {
b.Fatalf("temporary file: %v", err)
}
defer os.Remove(fpath)
p := nxpipe.Line(
nxpipe.Exec("cat", fpath),
nxpipe.Func(func(s *nxpipe.Session) error {
_, err := io.Copy(ioutil.Discard, s.Stdin)
return err
}),
)
b.ResetTimer()
for i := 0; i < b.N; i++ {
err := nxpipe.Run(p)
if err != nil {
b.Fatalf("exec: %v", err)
}
}
b.StopTimer()
}
func BenchmarkPipingLineReverse(b *testing.B) {
b.SetBytes(benchmarkPipingSize)
fpath, err := mkRandFile(benchmarkPipingSize)
if err != nil {
b.Fatalf("temporary file: %v", err)
}
defer os.Remove(fpath)
p := nxpipe.Line(
nxpipe.Func(func(s *nxpipe.Session) error {
f, err := os.Open(fpath)
if err != nil {
return err
}
defer f.Close()
_, err = io.Copy(s.Stdout, f)
return err
}),
nxpipe.Exec("cat"),
)
b.ResetTimer()
for i := 0; i < b.N; i++ {
err := nxpipe.Run(p)
if err != nil {
b.Fatalf("exec: %v", err)
}
}
b.StopTimer()
}
func BenchmarkPipingShell(b *testing.B) {
b.SetBytes(benchmarkPipingSize)
fpath, err := mkRandFile(benchmarkPipingSize)
if err != nil {
b.Fatalf("temporary file: %v", err)
}
defer os.Remove(fpath)
shellcmd := fmt.Sprintf("cat %q | cat > /dev/null", fpath)
p := nxpipe.Exec("sh", "-c", shellcmd)
b.ResetTimer()
for i := 0; i < b.N; i++ {
err := nxpipe.Run(p)
if err != nil {
b.Fatalf("exec: %v", err)
}
}
b.StopTimer()
}