utils.h

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#pragma once
#include <algorithm>
#include <cctype>
#include <filesystem>
#include <locale>
#include <string>
#include <vector>
#if __COSMOPOLITAN__
#include <cosmo.h>
#endif
 
namespace platformdirs {
namespace utils {
 
// https://stackoverflow.com/questions/216823/how-to-trim-a-stdstring
// trim from start (in place)
inline void ltrim(std::string &s) {
  s.erase(s.begin(), std::find_if(s.begin(), s.end(), [](unsigned char ch) {
            return !std::isspace(ch);
          }));
}
 
// https://stackoverflow.com/questions/216823/how-to-trim-a-stdstring
// trim from end (in place)
inline void rtrim(std::string &s) {
  s.erase(std::find_if(s.rbegin(), s.rend(),
                       [](unsigned char ch) { return !std::isspace(ch); })
              .base(),
          s.end());
}
 
inline auto home_path() -> std::filesystem::path {
#if __COSMOPOLITAN__
  if (IsWindows()) {
    if (auto const userprofile_dir = std::getenv("USERPROFILE")) {
      return std::filesystem::path(userprofile_dir);
    } else {
      throw std::runtime_error("%USERPROFILE% not set");
    }
  } else {
    if (auto const home_dir = std::getenv("HOME")) {
      return std::filesystem::path(home_dir);
    } else {
      throw std::runtime_error("$HOME not set");
    }
  }
#elif _WIN32
  if (auto const userprofile_dir = std::getenv("USERPROFILE")) {
    return std::filesystem::path(userprofile_dir);
  } else {
    throw std::runtime_error("%USERPROFILE% not set");
  }
#else
  if (auto const home_dir = std::getenv("HOME")) {
    return std::filesystem::path(home_dir);
  } else {
    throw std::runtime_error("$HOME not set");
  }
#endif
}
 
inline std::vector<std::string> split(std::string s, std::string delimiter) {
  size_t pos_start = 0, pos_end, delim_len = delimiter.length();
  std::string token;
  std::vector<std::string> res;
 
  while ((pos_end = s.find(delimiter, pos_start)) != std::string::npos) {
    token = s.substr(pos_start, pos_end - pos_start);
    pos_start = pos_end + delim_len;
    res.push_back(token);
  }
 
  res.push_back(s.substr(pos_start));
  return res;
}
 
inline std::string pathsep() {
#if __COSMOPOLITAN__
  return IsWindows() ? ";" : ":";
#elif _WIN32
  return ";";
#else
  return ":";
#endif
}
 
inline std::string join(const std::vector<std::string> &lst,
                        const std::string &delim) {
  std::string ret;
  for (const auto &s : lst) {
    if (!ret.empty())
      ret += delim;
    ret += s;
  }
  return ret;
}
 
} // namespace utils
} // namespace platformdirs