Problem Statement

Create a directory and any missing parents. This task is named after the posix mkdir -p command, and several libraries which implement the same behavior. Please implement a function of a single path string (for example ./path/to/dir) which has the above side-effect. If the directory already exists, return successfully. Ideally implementations will work equally well cross-platform (on windows, linux, and OS X). It's likely that your language implements such a function as part of its standard library. If so, please also show how such a function would be implemented.

Let's start with the solution:

void
mkdirp(text path)
{
    list l;
    text p, s;

    file().b_affix(path).news(l, 0, 0, "/");

    for (, s in l) {
        p = p + s + "/";
        trap_q(mkdir, p, 00755);
    }
}

integer
main(void)
{
    mkdirp("./path/to/dir");

    0;
}