From 6e3070181fadbe47511b52c12af5e1409a9a70b0 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Fri, 11 Jun 2021 21:22:21 +0200
Subject: Refactor at 4'o clock

---
 task.cc | 199 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 199 insertions(+)
 create mode 100644 task.cc

(limited to 'task.cc')

diff --git a/task.cc b/task.cc
new file mode 100644
index 0000000..0b4240f
--- /dev/null
+++ b/task.cc
@@ -0,0 +1,199 @@
+#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)
+{
+	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) +
+				 " -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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