mime_run_command
int mime_run_command(const char *, FILE *);
flags = mime_run_command(mip->mi_command_hook, NULL);
flags = mime_run_command(cmd, pipe_end(mip));
flags = mime_run_command(cmd, pipe_end(mip));
flags = mime_run_command(cmd, pipe_end(mip));
flags = mime_run_command(cmd, NULL);