/
main.go
48 lines (44 loc) · 1.01 KB
/
main.go
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package main
import (
"compress/zlib"
"fmt"
"io"
"os"
"github.com/codegangsta/cli"
)
func main() {
app := cli.NewApp()
app.Name = "zlib"
app.Usage = "A command-line tool for using the zlib compression algorithm."
app.Action = func(c *cli.Context) {
var reader io.Reader = os.Stdin
if c.Bool("decompress") {
compressorReadCloser, err := zlib.NewReader(reader)
if err != nil {
exit(err.Error(), 1)
}
if _, err := io.Copy(os.Stdout, compressorReadCloser); err != nil {
exit(err.Error(), 1)
}
compressorReadCloser.Close()
} else {
var writer io.Writer = os.Stdout
compressorWriteCloser := zlib.NewWriter(writer)
if _, err := io.Copy(compressorWriteCloser, reader); err != nil {
exit(err.Error(), 1)
}
compressorWriteCloser.Close()
}
}
app.Flags = []cli.Flag{
cli.BoolFlag{
Name: "d, decompress",
Usage: "Decompresses the input instead of compressing the output.",
},
}
app.Run(os.Args)
}
func exit(msg string, code int) {
fmt.Println(msg)
os.Exit(code)
}