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package main
import (
"fmt"
"io"
"os"
"github.com/cespare/xxhash/v2"
)
func main() {
if contains(os.Args[1:], "-h") {
fmt.Fprintf(os.Stderr, `Usage:
%s [filenames]
If no filenames are provided or only - is given, input is read from stdin.
`, os.Args[0])
os.Exit(1)
}
if len(os.Args) < 2 || len(os.Args) == 2 && os.Args[1] == "-" {
printHash(os.Stdin, "-")
return
}
for _, path := range os.Args[1:] {
f, err := os.Open(path)
if err != nil {
fmt.Fprintln(os.Stderr, err)
continue
}
printHash(f, path)
f.Close()
}
}
func contains(ss []string, s string) bool {
for _, s1 := range ss {
if s1 == s {
return true
}
}
return false
}
func printHash(r io.Reader, name string) {
h := xxhash.New()
if _, err := io.Copy(h, r); err != nil {
fmt.Fprintln(os.Stderr, err)
return
}
fmt.Printf("%016x %s\n", h.Sum64(), name)
}
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