From e0817cbcdcdbec81d7ce2f5141b4f99bbc2bece7 Mon Sep 17 00:00:00 2001
From: regnat <rg@regnat.ovh>
Date: Wed, 16 Sep 2020 09:06:35 +0200
Subject: [PATCH] Don't include nlohmann/json.hpp in config.hh

Instead make a separate header with the template implementation of
`BaseSetting<T>::toJSONObj` that can be included where needed
---
 src/libstore/globals.hh              |  1 +
 src/libutil/abstractsettingtojson.hh | 15 +++++++++++++++
 src/libutil/config.cc                |  1 +
 src/libutil/config.hh                | 10 ++--------
 4 files changed, 19 insertions(+), 8 deletions(-)
 create mode 100644 src/libutil/abstractsettingtojson.hh

diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index 8a2d3ff75..02721285a 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -2,6 +2,7 @@
 
 #include "types.hh"
 #include "config.hh"
+#include "abstractsettingtojson.hh"
 #include "util.hh"
 
 #include <map>
diff --git a/src/libutil/abstractsettingtojson.hh b/src/libutil/abstractsettingtojson.hh
new file mode 100644
index 000000000..b3fbc84f7
--- /dev/null
+++ b/src/libutil/abstractsettingtojson.hh
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <nlohmann/json.hpp>
+#include "config.hh"
+
+namespace nix {
+template<typename T>
+std::map<std::string, nlohmann::json> BaseSetting<T>::toJSONObject()
+{
+    auto obj = AbstractSetting::toJSONObject();
+    obj.emplace("value", value);
+    obj.emplace("defaultValue", defaultValue);
+    return obj;
+}
+}
diff --git a/src/libutil/config.cc b/src/libutil/config.cc
index faa5cdbeb..309d23b40 100644
--- a/src/libutil/config.cc
+++ b/src/libutil/config.cc
@@ -1,5 +1,6 @@
 #include "config.hh"
 #include "args.hh"
+#include "abstractsettingtojson.hh"
 
 #include <nlohmann/json.hpp>
 
diff --git a/src/libutil/config.hh b/src/libutil/config.hh
index 18fa9dea8..1f5f4e7b9 100644
--- a/src/libutil/config.hh
+++ b/src/libutil/config.hh
@@ -4,7 +4,7 @@
 
 #include "types.hh"
 
-#include <nlohmann/json.hpp>
+#include <nlohmann/json_fwd.hpp>
 
 #pragma once
 
@@ -255,13 +255,7 @@ public:
 
     void convertToArg(Args & args, const std::string & category) override;
 
-    std::map<std::string, nlohmann::json> toJSONObject() override
-    {
-        auto obj = AbstractSetting::toJSONObject();
-        obj.emplace("value", value);
-        obj.emplace("defaultValue", defaultValue);
-        return obj;
-    }
+    std::map<std::string, nlohmann::json> toJSONObject() override;
 };
 
 template<typename T>