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#include "task.h"
#include <iostream>
#include <fstream>
#include "libcppbuild.h"
#include "settings.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 ::
Task::Task(const BuildConfiguration& config, const Settings& settings,
const std::string& source)
: config(config)
, settings(settings)
{
sourceFile = source;
targetFile = settings.builddir / sourceFile.stem();
targetFile += ".o";
depsFile = settings.builddir / sourceFile.stem();
depsFile += ".d";
}
void Task::start()
{
future =
std::async(std::launch::async,
[&]()
{
if(!std::filesystem::exists(sourceFile))
{
std::cout << "Missing source file: " << std::string(sourceFile) << "\n";
return 1;
}
bool recompile{false};
if(!recompile &&
!std::filesystem::exists(targetFile))
{
recompile = true;
std::cout << "Missing targetFile\n";
}
if(!recompile &&
!std::filesystem::exists(depsFile))
{
recompile = true;
std::cout << "Missing depsFile\n";
}
if(!recompile &&
std::filesystem::last_write_time(sourceFile) >
std::filesystem::last_write_time(depsFile))
{
recompile = true;
std::cout << "The sourceFile newer than depsFile\n";
}
if(!recompile)
{
auto depList = readDeps(depsFile);
for(const auto& dep : depList)
{
if(!std::filesystem::exists(dep) ||
std::filesystem::last_write_time(targetFile) <
std::filesystem::last_write_time(dep))
{
recompile = true;
std::cout << "The targetFile older than dep\n";
break;
}
}
}
if(!recompile &&
std::filesystem::last_write_time(sourceFile) >
std::filesystem::last_write_time(targetFile))
{
recompile = true;
std::cout << "The targetFile older than sourceFile\n";
}
if(recompile)
{
std::string cmd =
"g++ -MMD -c " + std::string(sourceFile) + " " +
config.cxxflags + " " +
"-o " + std::string(targetFile);
std::cout << cmd << "\n";
if(system(cmd.data()))
{
return 1;
}
return 0;
}
return 0;
});
}
int Task::wait()
{
future.wait();
return future.get();
}
int Task::clean()
{
if(std::filesystem::exists(targetFile))
{
std::cout << "Removing " << std::string(targetFile) << "\n";
std::filesystem::remove(targetFile);
}
if(std::filesystem::exists(depsFile))
{
std::cout << "Removing " << std::string(depsFile) << "\n";
std::filesystem::remove(depsFile);
}
return 0;
}
std::vector<std::string> Task::depends()
{
return {};
}
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