Fix clangd in nix shell

CMakeLists.txt

@@ -23,6 +23,13 @@ project(Feynman
 # Clangd command file
 set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
 
+if(CMAKE_EXPORT_COMPILE_COMMANDS)
+  # We need this setup for clangd to work inside of a Nix shell.
+  # https://cmake.org/cmake/help/latest/variable/CMAKE_LANG_IMPLICIT_INCLUDE_DIRECTORIES.html
+  set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES
+      ${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES})
+endif()
+
 # =============================================================================
 # Policies
 # =============================================================================

feynman/CMakeLists.txt

@@ -24,8 +24,7 @@ find_package(argparse REQUIRED)
 find_package(fmt REQUIRED)
 find_package(RocksDB REQUIRED)
 
-add_executable(feynman
-)
+add_executable(feynman)
 
 set_target_properties(feynman PROPERTIES
   VERSION ${PROJECT_VERSION}
@@ -56,7 +55,7 @@ target_include_directories(feynman SYSTEM PUBLIC
   # We don't want the generated files from table gen
   # to be treated as local since the contain warnings
   ${PROJECT_BINARY_DIR}/feynman/include
-
+  ${argparse_INCLUDE_DIRS}
 )
 target_link_libraries(feynman PRIVATE
   argparse::argparse

flake.nix

@@ -175,7 +175,6 @@
       build
       run
       compile
-      blah
     ]);
 
 
@@ -185,7 +184,7 @@
       buildInputs = deps;
 
 
-      CPP_LS = "clangd -j 30 --query-driver=${pkgs.clang_17}/bin/clang++-*";
+      CPP_LS = "clangd -j 30 --query-driver=${pkgs.clang_17}/bin/clang-*";
       shellHook = ''
       fish && exit
       '';

nix/utils.nix

@@ -18,10 +18,11 @@ let
   compile = writeShellApplication {
     name = "compile";
     runtimeInputs = deps;
+
     text = ''
       mkdir -p ./build
       cd build
-      ${cmake}/bin/cmake -GNinja .. "$@"
+      ${cmake}/bin/cmake -GNinja .. -DCMAKE_CXX_FLAGS="-v" "$@"
       ${ninja}/bin/ninja -j32 -v
     '';
   };
@@ -44,5 +45,5 @@ let
   };
 
 in {
-  inherit compile run build blah;
+  inherit compile run build;
 }