fs: dedup functions, fix absolute paths in cfg

fixes #2

closes #12

src/config/Config.cpp

@@ -2,18 +2,12 @@
 
 #include <glaze/glaze.hpp>
 
+#include "../helpers/FsUtils.hpp"
 #include "../GlobalState.hpp"
 
-static std::string readFileAsText(const std::string& path) {
-    std::ifstream ifs(path);
-    auto          res = std::string((std::istreambuf_iterator<char>(ifs)), (std::istreambuf_iterator<char>()));
-    if (res.back() == '\n')
-        res.pop_back();
-    return res;
-}
-
 CConfig::CConfig() {
-    auto json = glz::read_jsonc<SConfig>(readFileAsText(g_pGlobalState->cwd + "/" + g_pGlobalState->configPath));
+    auto json = glz::read_jsonc<SConfig>(
+        NFsUtils::readFileAsString(NFsUtils::isAbsolute(g_pGlobalState->configPath) ? g_pGlobalState->configPath : g_pGlobalState->cwd + "/" + g_pGlobalState->configPath).value());
 
     if (!json.has_value())
         throw std::runtime_error("No config / bad config format");