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main.go
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main.go
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package main
import (
"fmt"
"io"
"log"
"os"
uncp "github.com/ray-g/gopl/ch10/ex10.02/uncompressor"
_ "github.com/ray-g/gopl/ch10/ex10.02/uncompressor/tar"
_ "github.com/ray-g/gopl/ch10/ex10.02/uncompressor/zip"
)
func printArchive(filename string) error {
f, err := os.Open(filename)
if err != nil {
return err
}
defer f.Close()
r, err := uncp.Open(f)
if err != nil {
return fmt.Errorf("open archive reader: %s", err)
}
_, err = io.Copy(os.Stdout, r)
if err != nil {
return fmt.Errorf("printing: %s", err)
}
return nil
}
func main() {
if len(os.Args) < 2 {
fmt.Fprintln(os.Stderr, "usage: extract FILE ...")
}
exitCode := 0
for _, filename := range os.Args[1:] {
err := printArchive(filename)
if err != nil {
log.Print(err)
exitCode = 2
}
}
os.Exit(exitCode)
}