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// extract-code.cpp : Scan a Markdown file for C++ programs

#include <string>

#include <sstream>

#include <regex>

#include <vector>

#include <iostream>

#include <fstream>

using namespace std;

int main(const int argc, const char **argv) {

vector<string_view> args{ argv + 1, argv + argc };

for (const auto& filename : args) {

cout << "- " << filename << ":\n";

string input_file, line;

ifstream infile{ filename.data() };

if (!infile) {

cerr << "Error opening file: " << filename << '\n';

return 1;

}

for (;;) {

getline(infile, line);

if (infile.eof()) {

break;

}

input_file += line + '\n';

}

infile.close();

istringstream iss{ input_file };

while (!iss.eof()) {

getline(iss, line);

if ((line != "```cpp") && (line != "```")) {

continue;

}

bool no_cpp = line == "```";

getline(iss, line);

regex is_cpp { R"(^// ([[:alnum:]_-]+\.cpp) :)" };

smatch matches;

if (regex_search(line, matches, is_cpp)) {

cerr << "Filename: " << matches[1] << (no_cpp ? " (no type)" : "") << '\n';

}

string output_file = matches[1];

ofstream header{ "headers\\"s + output_file, ios_base::binary },

module{ "modules\\"s + output_file, ios_base::binary };

while (line != "```") {

header << line << '\n';

if (line == "using namespace std;") {

module << "import std;\n";

}

if (line.substr(0, 8) != "#include") {

module << line << '\n';

}

getline(iss, line);

}