1 files changed, 55 insertions, 0 deletions
diff --git a/internal/yae/utilities.go b/internal/yae/utilities.go
new file mode 100644
index 0000000..ef9d334
--- /dev/null
+++ b/internal/yae/utilities.go
@@ -0,0 +1,55 @@
+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 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])
+}