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#include <vector>
#include <string>
#include <filesystem>
#include <iostream>
#include <fstream>
#include <regex>
#include <utility>
#include "libcppbuild.h"
namespace
{
std::string readFile(const std::string &fileName)
{
std::ifstream ifs(fileName.c_str(), std::ios::in | std::ios::binary | std::ios::ate);
std::ifstream::pos_type fileSize = ifs.tellg();
ifs.seekg(0, std::ios::beg);
std::vector<char> bytes(fileSize);
ifs.read(bytes.data(), fileSize);
return std::string(bytes.data(), fileSize);
}
std::vector<std::string> readDeps(const std::string& depFile)
{
if(!std::filesystem::exists(depFile))
{
return {};
}
auto str = readFile(depFile);
std::vector<std::string> output;
std::string tmp;
bool start{false};
bool in_whitespace{false};
for(const auto& c : str)
{
if(c == '\\' || c == '\n')
{
continue;
}
if(c == ':')
{
start = true;
continue;
}
if(!start)
{
continue;
}
if(c == ' ' || c == '\t')
{
if(in_whitespace)
{
continue;
}
if(!tmp.empty())
{
output.push_back(tmp);
}
tmp.clear();
in_whitespace = true;
}
else
{
in_whitespace = false;
tmp += c;
}
}
if(!tmp.empty())
{
output.push_back(tmp);
}
return output;
}
} // namespace ::
int main(int argc, const char* argv[])
{
if(argc == 2 && std::string(argv[1]) == "clean")
{
system("rm -Rf build");
return 0;
}
std::filesystem::path builddir("build/");
std::filesystem::create_directory(builddir);
auto project = configs();
std::string output = "build/" + project.target;
const auto& files = project.sources;
std::vector<std::string> objects;
std::cout << "Building\n";
for(const auto& file : files)
{
auto path = std::filesystem::path(file);
std::string object = builddir / path.stem();
object += ".o";
objects.push_back(object);
std::string deps = builddir / path.stem();
deps += ".d";
if(!std::filesystem::exists(file))
{
std::cout << "Missing source file: " << file << "\n";
return 1;
}
bool recompile{false};
if(!std::filesystem::exists(object) ||
!std::filesystem::exists(deps))
{
recompile = true;
}
if(!recompile &&
std::filesystem::last_write_time(file) >
std::filesystem::last_write_time(deps))
{
recompile = true;
}
if(!recompile)
{
auto depList = readDeps(deps);
for(const auto& dep : depList)
{
if(!std::filesystem::exists(dep) ||
std::filesystem::last_write_time(object) <
std::filesystem::last_write_time(dep))
{
recompile = true;
break;
}
}
}
if(recompile ||
!std::filesystem::exists(object) ||
std::filesystem::last_write_time(file) >
std::filesystem::last_write_time(object))
{
std::string compiler = "g++ -MMD -c " + file + " -o " + object;
std::cout << compiler << "\n";
if(system(compiler.data()))
{
return 1;
}
}
}
std::cout << "Linking\n";
bool dolink{false};
if(!std::filesystem::exists(output))
{
dolink = true;
}
else
{
for(const auto& object : objects)
{
if(std::filesystem::last_write_time(output) <=
std::filesystem::last_write_time(object))
{
dolink = true;
break;
}
}
}
if(!dolink)
{
std::cout << "No linking needed\n";
return 0;
}
std::string objectlist;
for(const auto& object : objects)
{
objectlist += object + " ";
}
std::string compiler = "g++ " + objectlist + " -o " + output;
std::cout << compiler << "\n";
if(system(compiler.data()))
{
return 1;
}
return 0;
}
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