Add INI parser and function to expand env vars

include/Utils.h

@@ -5,10 +5,13 @@
 */
 
 #pragma once
+#include <map>
+#include <regex>
 #include <string>
 #include <vector>
 
 namespace Utils {
+
     inline std::vector<std::string> Split(const std::string& String, const std::string& delimiter) {
         std::vector<std::string> Val;
         size_t pos;
@@ -23,4 +26,90 @@ namespace Utils {
             Val.push_back(s);
         return Val;
     };
+    inline std::string ExpandEnvVars(const std::string& input) {
+        std::string result;
+        std::regex envPattern(R"(%([^%]+)%|\$([A-Za-z_][A-Za-z0-9_]*)|\$\{([^}]+)\})");
+
+        std::sregex_iterator begin(input.begin(), input.end(), envPattern);
+        std::sregex_iterator end;
+
+        size_t lastPos = 0;
+
+        for (auto it = begin; it != end; ++it) {
+            const auto& match = *it;
+
+            result.append(input, lastPos, match.position() - lastPos);
+
+            std::string varName;
+            if (match[1].matched) varName = match[1].str(); // %VAR%
+            else if (match[2].matched) varName = match[2].str(); // $VAR
+            else if (match[3].matched) varName = match[3].str(); // ${VAR}
+
+            if (const char* envValue = std::getenv(varName.c_str())) {
+                result.append(envValue);
+            }
+
+            lastPos = match.position() + match.length();
+        }
+
+        result.append(input, lastPos, input.length() - lastPos);
+
+        return result;
+    }
+    inline std::map<std::string, std::map<std::string, std::string>> ParseINI(const std::string& contents) {
+        std::map<std::string, std::map<std::string, std::string>> ini;
+
+        std::string currentSection;
+        auto sections = Split(contents, "\n");
+
+        for (size_t i = 0; i < sections.size(); i++) {
+            std::string line = sections[i];
+            if (line.empty() || line[0] == ';' || line[0] == '#')
+                continue;
+
+            for (auto& c : line) {
+                if (c == '#' || c == ';') {
+                    line = line.substr(0, &c - &line[0]);
+                    break;
+                }
+            }
+
+            auto invalidLineLog = [&]{
+                warn("Invalid INI line: " + line);
+                warn("Surrounding lines: \n" +
+                    (i > 0 ? sections[i - 1] : "") + "\n" +
+                    (i < sections.size() - 1 ? sections[i + 1] : ""));
+            };
+
+            if (line[0] == '[') {
+                currentSection = line.substr(1, line.find(']') - 1);
+            } else {
+
+                if (currentSection.empty()) {
+                    invalidLineLog();
+                    continue;
+                }
+
+                std::string key, value;
+                size_t pos = line.find('=');
+                if (pos != std::string::npos) {
+                    key = line.substr(0, pos);
+                    value = line.substr(pos + 1);
+                    ini[currentSection][key] = value;
+                } else {
+                    invalidLineLog();
+                    continue;
+                }
+
+                key.erase(key.find_last_not_of(" \t") + 1);
+                value.erase(0, value.find_first_not_of(" \t"));
+                value.erase(value.find_last_not_of(" \t") + 1);
+
+                ini[currentSection][key] = value;
+            }
+        }
+
+        return ini;
+    }
+
 };