created formatter

src/formatter.cpp

@@ -0,0 +1,31 @@
+#include "markdown.hpp"
+#include <fstream>
+#include <sstream>
+#include <string>
+
+bool replace(std::string &str, const std::string &from, const std::string &to) {
+  size_t start_pos = str.find(from);
+  if (start_pos == std::string::npos)
+    return false;
+  str.replace(start_pos, from.length(), to);
+  return true;
+}
+
+// Change template from file into html
+// Return html in string
+std::string inject_html_into_template(const std::string &FILE_NAME,
+                                      const std::string &TEMPLATE,
+                                      const std::string &HTML) {
+  std::string result;
+  std::ifstream file(FILE_NAME);
+  if (!file.is_open()) {
+    return "";
+  }
+  std::ostringstream ss;
+  ss << file.rdbuf();
+  result = ss.str();
+  if (replace(result, TEMPLATE, HTML)) {
+    return result;
+  }
+  return "";
+}