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package yae
import (
"fmt"
"os"
"os/exec"
"strings"
)
func FetchSHA256(url string, unpack bool) (string, error) {
arguments := []string{"--type", "sha256", url}
if unpack {
arguments = append([]string{"--unpack"}, arguments...)
}
output, err := command("nix-prefetch-url", false, arguments...)
if err != nil {
return "", err
}
lines := strings.Split(output, "\n")
return strings.Trim(lines[len(lines)-2], "\n"), nil
}
func FetchSRIHash(sha256 string) (string, error) {
output, err := command("nix", false, "hash", "convert", "--hash-algo", "sha256", "--from", "nix32", sha256)
if err != nil {
return "", err
}
return strings.Trim(output, "\n"), nil
}
func command(name string, show bool, args ...string) (string, error) {
executable, err := exec.LookPath(name)
out := []byte{}
if show {
cmd := exec.Command(executable, args...)
cmd.Stdin = os.Stdin
cmd.Stderr = os.Stderr
out, err = cmd.Output()
} else {
cmd := exec.Command(executable, args...)
out, err = cmd.Output()
}
return string(out), err
}
func Lister(items []string) string {
if len(items) == 0 {
return ""
} else if len(items) == 1 {
return items[0]
} else if len(items) == 2 {
return fmt.Sprintf("%s & %s", items[0], items[1])
}
return fmt.Sprintf("%s, & %s", strings.Join(items[:len(items)-1], ", "), items[len(items)-1])
}
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