varlist: move to a separate header, add join

src/helpers/VarList.hpp

@@ -0,0 +1,41 @@
+#pragma once
+#include <vector>
+#include <string>
+#include "../macros.hpp"
+
+class CVarList {
+  public:
+    /* passing 's' as a separator will use std::isspace */
+    CVarList(const std::string& in, long unsigned int lastArgNo = 0, const char separator = ',');
+
+    ~CVarList() = default;
+
+    size_t size() const {
+        return m_vArgs.size();
+    }
+
+    std::string join(const std::string& joiner, size_t from = 0, size_t to = 0) const;
+
+    std::string operator[](const long unsigned int& idx) const {
+        if (idx >= m_vArgs.size())
+            return "";
+        return m_vArgs[idx];
+    }
+
+    // for range-based loops
+    std::vector<std::string>::iterator begin() {
+        return m_vArgs.begin();
+    }
+    std::vector<std::string>::const_iterator begin() const {
+        return m_vArgs.begin();
+    }
+    std::vector<std::string>::iterator end() {
+        return m_vArgs.end();
+    }
+    std::vector<std::string>::const_iterator end() const {
+        return m_vArgs.end();
+    }
+
+  private:
+    std::vector<std::string> m_vArgs;
+};