// Directory utilities. This library contains functions for locating configuration directories, for
// testing if a command with a given name can be found in the PATH, and various other path-related
// issues.
#include "config.h"  // IWYU pragma: keep

#include "path.h"

#include <cstring>
#include <string>
#include <utility>
#include <vector>

#include "common.h"
#include "fallback.h"  // IWYU pragma: keep
#include "wcstringutil.h"
#include "wutil.h"  // IWYU pragma: keep

void append_path_component(wcstring &path, const wcstring &component) {
    if (path.empty() || component.empty()) {
        path.append(component);
    } else {
        size_t path_len = path.size();
        bool path_slash = path.at(path_len - 1) == L'/';
        bool comp_slash = component.at(0) == L'/';
        if (!path_slash && !comp_slash) {
            // Need a slash
            path.push_back(L'/');
        } else if (path_slash && comp_slash) {
            // Too many slashes.
            path.erase(path_len - 1, 1);
        }
        path.append(component);
    }
}