From 330336c28507e0ee3a77d20e03dbc994618c213c Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Sat, 19 Jun 2021 12:44:02 +0200
Subject: Support multiple build config files.

---
 libcppbuild.cc | 96 ++++++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 67 insertions(+), 29 deletions(-)

(limited to 'libcppbuild.cc')

diff --git a/libcppbuild.cc b/libcppbuild.cc
index b400061..d58705d 100644
--- a/libcppbuild.cc
+++ b/libcppbuild.cc
@@ -9,6 +9,7 @@
 #include <memory>
 #include <algorithm>
 #include <list>
+#include <array>
 
 #include <getoptpp/getoptpp.hpp>
 
@@ -83,35 +84,65 @@ std::shared_ptr<Task> getNextTask(const std::list<std::shared_ptr<Task>>& allTas
 	return nullptr;
 }
 
-namespace
+struct Config
 {
-// Hack to get command-line args for re-launch
-int g_argc;
-char** g_argv;
-}
+	const char* file;
+	std::vector<BuildConfiguration> (*cb)();
+};
+std::array<Config, 100> configFiles;
+int numConfigFiles{0};
 
 // TODO: Use c++20 when ready, somehing like this:
 //void reg(const std::source_location location =
 //         std::source_location::current())
-void reg(const std::string& location)
+int reg(const char* location,
+        std::vector<BuildConfiguration> (*cb)())
+{
+	// NOTE: std::cout cannot be used here
+	configFiles[numConfigFiles].file = location;
+	configFiles[numConfigFiles].cb = cb;
+	++numConfigFiles;
+	return 0;
+}
+
+void recompileCheck(int argc, char* argv[])
 {
-	std::filesystem::path configFile(location);
-	std::filesystem::path binFile(configFile.stem());
-	if(std::filesystem::last_write_time(binFile) <=
-	   std::filesystem::last_write_time(configFile))
+	bool dirty{false};
+
+	std::vector<std::string> args;
+	args.push_back("-s");
+	args.push_back("-O3");
+	args.push_back("-std=c++17");
+	args.push_back("-pthread");
+
+	std::filesystem::path binFile("cppbuild");
+
+	std::cout << "Recompile check (" << numConfigFiles << "):\n";
+	for(int i = 0; i < numConfigFiles; ++i)
+	{
+		std::string location = configFiles[i].file;
+		std::cout << " - " << location << "\n";
+		std::filesystem::path configFile(location);
+		if(std::filesystem::last_write_time(binFile) <=
+		   std::filesystem::last_write_time(configFile))
+		{
+			dirty = true;
+		}
+
+		// Support adding multiple config functions from the same file
+		if(std::find(args.begin(), args.end(), location) == std::end(args))
+		{
+			args.push_back(location);
+		}
+	}
+	args.push_back("libcppbuild.a");
+	args.push_back("-o");
+	args.push_back(binFile.string());
+
+	if(dirty)
 	{
 		std::cout << "Rebuilding config\n";
-		auto ret = execute("/usr/bin/g++",
-		                   {
-			                   "-s",
-			                   "-O3",
-			                   "-std=c++17",
-			                   "-pthread",
-			                   configFile.string(),
-			                   "libcppbuild.a",
-			                   "-o",
-			                   binFile.string(),
-			                 });
+		auto ret = execute("/usr/bin/g++", args);
 		if(ret != 0)
 		{
 			std::cerr << "Failed.\n";
@@ -121,21 +152,18 @@ void reg(const std::string& location)
 		{
 			std::cout << "Re-launch\n";
 			std::vector<std::string> args;
-			for(int i = 1; i < g_argc; ++i)
+			for(int i = 1; i < argc; ++i)
 			{
-				args.push_back(g_argv[i]);
+				args.push_back(argv[i]);
 			}
-			exit(execute(g_argv[0], args));
+			exit(execute(argv[0], args));
 		}
 	}
-
-//	g++ -s -O3 -std=c++17 -pthread $0 libcppbuild.a -o cppbuild
 }
 
 int main(int argc, char* argv[])
 {
-	g_argc = argc;
-	g_argv = argv;
+	recompileCheck(argc, argv);
 
 	Settings settings;
 	// TODO: Set from commandline
@@ -183,7 +211,17 @@ int main(int argc, char* argv[])
 	std::filesystem::path builddir(settings.builddir);
 	std::filesystem::create_directories(builddir);
 
-	auto build_configs = configs();
+	std::vector<BuildConfiguration> build_configs;
+	for(int i = 0; i < numConfigFiles; ++i)
+	{
+		//std::string location = configFiles[i].file;
+		auto configs = configFiles[i].cb();
+		for(const auto& config : configs)
+		{
+			build_configs.push_back(config);
+		}
+	}
+
 	std::list<std::shared_ptr<Task>> tasks;
 	for(const auto& build_config : build_configs)
 	{
-- 
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