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#include "paths.hh"
#include "str.hh"
#include <algorithm>
#include <cerrno>
#include <cstddef>
#include <cstdlib>
#include <iterator>
#include <memory>
#include <pwd.h>
#include <string_view>
#include <unistd.h>
#include <unordered_set>
#include <vector>
namespace paths {
namespace {
std::vector<std::filesystem::path> xdg_read_dirs(
const char* userdir_env_name, std::string_view userdir_home_default,
const char* dirs_env_name,
std::vector<std::filesystem::path> const& dirs_default_value) {
std::vector<std::filesystem::path> ret;
std::unordered_set<std::filesystem::path> tmp;
auto* env_userdir = getenv(userdir_env_name);
if (env_userdir != nullptr && env_userdir[0] != '\0') {
ret.emplace_back(env_userdir);
} else {
ret.emplace_back(home() / userdir_home_default);
}
tmp.insert(ret.back());
auto* env_dirs = getenv(dirs_env_name);
if (env_dirs != nullptr && env_dirs[0] != '\0') {
for (auto dir : str::split(env_dirs, ':')) {
if (tmp.emplace(dir).second) {
ret.emplace_back(dir);
}
}
} else {
std::ranges::copy_if(
dirs_default_value, std::back_inserter(ret),
[&tmp](auto const& dir) { return tmp.emplace(dir).second; });
}
return ret;
}
} // namespace
std::filesystem::path home() {
{
auto* str = getenv("HOME");
if (str != nullptr && str[0] != '\0')
return str;
}
{
auto maybe_size = sysconf(_SC_GETPW_R_SIZE_MAX);
size_t size = maybe_size > 0 ? static_cast<size_t>(maybe_size) : 1024;
auto buffer = std::make_unique<char[]>(size);
struct passwd pwd;
struct passwd* ret;
int err;
while (true) {
err = getpwuid_r(geteuid(), &pwd, buffer.get(), size, &ret);
if (err == 0)
break;
if (err != ERANGE)
break;
auto new_size = size * 2;
if (new_size < size)
break;
buffer = std::make_unique<char[]>(new_size);
size = new_size;
}
if (err == 0 && ret) {
if (ret->pw_dir != nullptr && ret->pw_dir[0] != '\0') {
return ret->pw_dir;
}
}
}
return "/";
}
std::vector<std::filesystem::path> config_dirs() {
static const std::vector<std::filesystem::path> fallback{"/etc/xdg"};
return xdg_read_dirs("XDG_CONFIG_HOME", ".config", "XDG_CONFIG_DIRS",
fallback);
}
std::vector<std::filesystem::path> data_dirs() {
static const std::vector<std::filesystem::path> fallback{"/usr/local/share/",
"/usr/share/"};
return xdg_read_dirs("XDG_DATA_HOME", ".local/share", "XDG_DATA_DIRS",
fallback);
}
} // namespace paths
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