From 80290e7d65dc498e9ea5e64aa6cbc65282072deb Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Fri, 18 Jun 2021 07:27:57 +0200
Subject: New dependency system.

---
 task_ar.cc | 188 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 188 insertions(+)
 create mode 100644 task_ar.cc

(limited to 'task_ar.cc')

diff --git a/task_ar.cc b/task_ar.cc
new file mode 100644
index 0000000..c133875
--- /dev/null
+++ b/task_ar.cc
@@ -0,0 +1,188 @@
+#include "task_ar.h"
+
+#include <iostream>
+#include <fstream>
+
+#include "libcppbuild.h"
+#include "settings.h"
+#include "execute.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> addPrefix(const std::vector<std::string>& lst,
+                                   const Settings& settings)
+{
+	std::vector<std::string> out;
+	for(const auto& item : lst)
+	{
+		std::filesystem::path file = settings.builddir;
+		file /= item;
+		out.push_back(file.string());
+	}
+	return out;
+}
+} // namespace ::
+
+TaskAR::TaskAR(const BuildConfiguration& config,
+               const Settings& settings,
+               const std::string& target,
+               const std::vector<std::string>& objects)
+	: Task(addPrefix(config.depends, settings))
+	, config(config)
+	, settings(settings)
+{
+	targetFile = settings.builddir;
+	targetFile /= target;
+	for(const auto& object : objects)
+	{
+		std::filesystem::path objectFile = object;
+		objectFiles.push_back(objectFile);
+		dependsStr.push_back(objectFile);
+	}
+
+	for(const auto& dep : config.depends)
+	{
+		std::filesystem::path depFile = settings.builddir;
+		depFile /= dep;
+		depFiles.push_back(depFile);
+	}
+
+	flagsFile = settings.builddir / targetFile.stem();
+	flagsFile += ".flags";
+}
+
+bool TaskAR::dirtyInner()
+{
+	if(!std::filesystem::exists(targetFile))
+	{
+		return true;
+	}
+
+	if(!std::filesystem::exists(flagsFile))
+	{
+		return true;
+	}
+
+	for(const auto& objectFile : objectFiles)
+	{
+		if(std::filesystem::last_write_time(targetFile) <=
+		   std::filesystem::last_write_time(objectFile))
+		{
+			return true;
+		}
+	}
+
+	{
+		auto lastFlags = readFile(flagsFile);
+		if(flagsString() != lastFlags)
+		{
+			//std::cout << "The compiler flags changed\n";
+			return true;
+		}
+	}
+
+	return false;
+}
+
+int TaskAR::runInner()
+{
+	std::string objectlist;
+	for(const auto& objectFile : objectFiles)
+	{
+		if(!objectlist.empty())
+		{
+			objectlist += " ";
+		}
+		objectlist += std::string(objectFile);
+	}
+
+	std::vector<std::string> args;
+	args.push_back("rcs");
+	args.push_back(std::string(targetFile));
+	for(const auto& objectFile : objectFiles)
+	{
+		args.push_back(std::string(objectFile));
+	}
+	for(const auto& flag : config.ldflags)
+	{
+		args.push_back(flag);
+	}
+
+	{ // Write flags to file.
+		std::ofstream flagsStream(flagsFile);
+		flagsStream << flagsString();
+	}
+
+	if(settings.verbose == 0)
+	{
+		std::cout << "AR => " << targetFile.string() << "\n";
+	}
+
+	return execute("/usr/bin/ar", args, settings.verbose > 0);
+}
+
+int TaskAR::clean()
+{
+	if(std::filesystem::exists(targetFile))
+	{
+		std::cout << "Removing " << std::string(targetFile) << "\n";
+		std::filesystem::remove(targetFile);
+	}
+
+	if(std::filesystem::exists(flagsFile))
+	{
+		std::cout << "Removing " << std::string(flagsFile) << "\n";
+		std::filesystem::remove(flagsFile);
+	}
+
+	return 0;
+}
+
+std::vector<std::string> TaskAR::depends() const
+{
+	std::vector<std::string> deps;
+	for(const auto& objectFile : objectFiles)
+	{
+		deps.push_back(objectFile.string());
+	}
+
+	for(const auto& depFile : depFiles)
+	{
+		deps.push_back(depFile.string());
+	}
+
+	return deps;
+}
+
+std::string TaskAR::target() const
+{
+	return targetFile.string();
+}
+
+std::string TaskAR::flagsString() const
+{
+	std::string flagsStr;
+	for(const auto& flag : config.ldflags)
+	{
+		if(!flagsStr.empty())
+		{
+			flagsStr += " ";
+		}
+		flagsStr += flag;
+	}
+	return flagsStr;
+}
-- 
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