Add dump helpers

save.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+)
+
+func runAndSaveCommand(filename, command string, args ...string) error {
+	c := exec.Command(command, args...)
+
+	fmt.Printf("Running %s\n\n", c.String())
+
+	f, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	stdout, err := c.StdoutPipe()
+	if err != nil {
+		return err
+	}
+
+	err = c.Start()
+	if err != nil {
+		return err
+	}
+
+	_, err = io.Copy(f, stdout)
+	if err != nil {
+		return err
+	}
+
+	return c.Wait()
+}