From a7f2893bfb5149944be598bd93b642ead27c1886 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Mon, 23 Dec 2024 12:14:46 +0100
Subject: WIP

---
 src/deps.cc | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)

(limited to 'src/deps.cc')

diff --git a/src/deps.cc b/src/deps.cc
index 9400b35..599be8c 100644
--- a/src/deps.cc
+++ b/src/deps.cc
@@ -5,6 +5,8 @@
 
 #include "util.h"
 
+#include <nlohmann/json.hpp>
+
 #include <fstream>
 
 namespace {
@@ -94,6 +96,74 @@ std::vector<std::string> readDepsMake(const std::string& dep_file)
 
 	return output;
 }
+
+// https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2022/p1689r5.html
+// https://devblogs.microsoft.com/cppblog/introducing-source-dependency-reporting-with-msvc-in-visual-studio-2019-version-16-7/
+/* Format examples:
+{
+    "Version": "1.1",
+    "Data": {
+        "Source": "z:\\home\\deva\\docs\\c\\ctor\\src\\libctor.cc",
+        "ProvidedModule": "",
+        "Includes": [
+            "c:\\program files (x86)\\microsoft visual studio\\2019\\buildtools\\vc\\tools\\msvc\\14.29.30133\\include\\vector",
+            "c:\\program files (x86)\\microsoft visual studio\\2019\\buildtools\\vc\\tools\\msvc\\14.29.30133\\include\\yvals_core.h",
+            "c:\\program files (x86)\\microsoft visual studio\\2019\\buildtools\\vc\\tools\\msvc\\14.29.30133\\include\\vcruntime.h",
+.
+.
+.
+            "z:\\home\\deva\\docs\\c\\ctor\\src\\unittest.h"
+        ],
+        "ImportedModules": [],
+        "ImportedHeaderUnits": []
+    }
+}
+*/
+/*
+{
+    "Version": "1.2",
+    "Data": {
+        "Source": "c:\\jenkins\\workspace\\ctor-linux64\\src\\build.cc",
+        "ProvidedModule": "",
+        "Includes": [
+            "c:\\jenkins\\workspace\\ctor-linux64\\src\\build.h",
+            "c:\\program files (x86)\\microsoft visual studio\\2022\\buildtools\\vc\\tools\\msvc\\14.42.34433\\include\\string",
+            "c:\\program files (x86)\\microsoft visual studio\\2022\\buildtools\\vc\\tools\\msvc\\14.42.34433\\include\\yvals_core.h",
+.
+.
+.
+            "c:\\program files (x86)\\microsoft visual studio\\2022\\buildtools\\vc\\tools\\msvc\\14.42.34433\\include\\iostream"
+        ],
+        "ImportedModules": [],
+        "ImportedHeaderUnits": []
+    }
+}
+*/
+
+std::vector<std::string> readDepsJson(const std::string& dep_file)
+{
+	std::ifstream stream(dep_file);
+	auto json = nlohmann::json::parse(stream);
+	for(const auto& [key, value] : json.items())
+	{
+		if(key == "Data" && value.is_object())
+		{
+			for(const auto& [inner_key, inner_value] : value.items())
+			{
+				if(inner_key == "Includes" && inner_value.is_array())
+				{
+					std::vector<std::string> deps;
+					for(const auto& dep : inner_value)
+					{
+						deps.emplace_back(dep);
+					}
+					return deps;
+				}
+			}
+		}
+	}
+	return {};
+}
 }
 
 std::vector<std::string> readDeps(const std::string& dep_file,
@@ -110,6 +180,10 @@ std::vector<std::string> readDeps(const std::string& dep_file,
 	case ctor::toolchain::none:
 		return {};
 
+	// json based:
+	case ctor::toolchain::msvc:
+		return readDepsJson(dep_file);
+
 	// makefile .d file based:
 	case ctor::toolchain::gcc:
 	case ctor::toolchain::clang:
-- 
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