96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
#include "fgc/Paths.h"
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#include <cstdlib>
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#include <filesystem>
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#include <unistd.h>
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namespace fs = std::filesystem;
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namespace fgc::paths {
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namespace {
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std::string envOr(const char* name, const std::string& fallback) {
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const char* v = std::getenv(name);
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return (v && *v) ? std::string(v) : fallback;
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}
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} // namespace
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std::string expandUser(const std::string& path) {
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if (path.empty()) return path;
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std::string out;
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out.reserve(path.size());
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// Leading ~ -> $HOME
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size_t i = 0;
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if (path[0] == '~' && (path.size() == 1 || path[1] == '/')) {
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out += envOr("HOME", "");
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i = 1;
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}
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// $VAR and ${VAR} expansion
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for (; i < path.size(); ++i) {
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if (path[i] == '$') {
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size_t start = i + 1;
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bool braced = (start < path.size() && path[start] == '{');
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if (braced) ++start;
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size_t end = start;
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while (end < path.size() &&
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(std::isalnum(static_cast<unsigned char>(path[end])) || path[end] == '_')) {
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++end;
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}
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std::string name = path.substr(start, end - start);
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if (!name.empty()) {
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out += envOr(name.c_str(), "");
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i = braced && end < path.size() && path[end] == '}' ? end : end - 1;
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continue;
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}
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}
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out += path[i];
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}
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return out;
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}
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std::string executableDir() {
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std::error_code ec;
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fs::path self = fs::read_symlink("/proc/self/exe", ec);
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if (ec) return {};
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return self.parent_path().string();
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}
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std::vector<std::string> configSearchPaths(const std::string& cliArg) {
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std::vector<std::string> paths;
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if (!cliArg.empty()) paths.push_back(expandUser(cliArg));
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if (const char* env = std::getenv("FGC_CONFIG"); env && *env)
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paths.push_back(expandUser(env));
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paths.push_back("config.ini"); // current working directory
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if (std::string dir = executableDir(); !dir.empty())
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paths.push_back((fs::path(dir) / "config.ini").string());
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std::string xdg = envOr("XDG_CONFIG_HOME", expandUser("~/.config"));
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if (!xdg.empty())
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paths.push_back((fs::path(xdg) / "fire_gimbal_control" / "config.ini").string());
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return paths;
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}
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std::optional<std::string> resolveConfigPath(const std::string& cliArg) {
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std::error_code ec;
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for (const auto& p : configSearchPaths(cliArg)) {
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if (fs::is_regular_file(p, ec)) return p;
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}
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return std::nullopt;
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}
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std::string defaultOutputDir() {
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std::string base = envOr("XDG_DATA_HOME", expandUser("~/.local/share"));
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return (fs::path(base) / "fire_gimbal_control" / "images").string();
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}
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} // namespace fgc::paths
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