Use shell symbols in directory path

问题

I want to open a file with my program, and I want to use shell symbols to make it easier for me to locate the file. Is there an easy way to have the shell expand out my file path before I use it on runtime. I'm looking for a function that does this.

~/.foo.bar -> /home/someuser/.foo.bar

Is there some easy way to have the shell preprocess the paths to files before opening the file?

回答1:

You can use wordexp:

#include <wordexp.h>

std::string wordexp(std::string var, int flags = 0)
{
    wordexp_t p;
    if(!wordexp(var.c_str(), &p, flags))
    {
        if(p.we_wordc && p.we_wordv[0])
            var = p.we_wordv[0];
        wordfree(&p);
    }
    return var;
}

int main()
{
    std::cout << wordexp("~/test") << '\n';
}

来源：https://stackoverflow.com/questions/31035974/use-shell-symbols-in-directory-path