Use CMake file API to find executables for source file

This is a lot more precise than the currently exisiting method and
correctly detects any modification to the executable file path
(e.g. setting CMAKE_RUNTIME_OUTPUT_DIRECTORY or the OUTPUT_NAME property).

src/cmake.cpp

@@ -3,6 +3,7 @@
 #include "config.hpp"
 #include "dialog.hpp"
 #include "filesystem.hpp"
+#include "json.hpp"
 #include "terminal.hpp"
 #include "utility.hpp"
 #include <boost/algorithm/string.hpp>
@@ -59,6 +60,8 @@ bool CMake::update_default_build(const boost::filesystem::path &default_build_pa
   if(!force && boost::filesystem::exists(default_build_path / "compile_commands.json", ec))
     return true;
 
+  set_file_api_queries(default_build_path);
+
   auto compile_commands_path = default_build_path / "compile_commands.json";
   bool canceled = false;
   Dialog::Message message("Creating/updating default build", [&canceled] {
@@ -120,6 +123,8 @@ bool CMake::update_debug_build(const boost::filesystem::path &debug_build_path,
   if(!force && boost::filesystem::exists(debug_build_path / "CMakeCache.txt", ec))
     return true;
 
+  set_file_api_queries(debug_build_path);
+
   bool canceled = false;
   Dialog::Message message("Creating/updating debug build", [&canceled] {
     canceled = true;
@@ -145,6 +150,13 @@ bool CMake::update_debug_build(const boost::filesystem::path &debug_build_path,
 }
 
 boost::filesystem::path CMake::get_executable(const boost::filesystem::path &build_path, const boost::filesystem::path &file_path) {
+
+  // prefer the CMake file API (if available) which gives exact information about the targets a file belongs to
+  auto executables = get_executables(build_path, file_path);
+  if(!executables.empty()) {
+    return executables.front();
+  }
+
   // CMake does not store in compile_commands.json if an object is part of an executable or not.
   // Therefore, executables are first attempted found in the cmake files. These executables
   // are then used to identify if a file in compile_commands.json is part of an executable or not
@@ -349,3 +361,68 @@ void CMake::parse_file(const std::string &src, std::map<std::string, std::list<s
     }
   }
 }
+
+void CMake::set_file_api_queries(const boost::filesystem::path &build_path) {
+  auto query_directory = build_path / ".cmake" / "api" / "v1" / "query" / "client-jucipp";
+
+  boost::system::error_code ec;
+  if(!boost::filesystem::exists(query_directory, ec)) {
+    boost::system::error_code ec;
+    boost::filesystem::create_directories(query_directory, ec);
+    if(ec) {
+      Terminal::get().print("\e[31mError\e[m: could not create " + filesystem::get_short_path(query_directory).string() + ": " + ec.message() + "\n", true);
+      return;
+    }
+  }
+
+  filesystem::write(query_directory / "query.json", R"({
+  "requests": [
+    { "kind": "codemodel" , "version": 2 }
+  ]
+})");
+}
+
+std::vector<boost::filesystem::path> CMake::get_executables(const boost::filesystem::path &build_path, const boost::filesystem::path &file_path) {
+  auto reply_directory = build_path / ".cmake" / "api" / "v1" / "reply";
+
+  boost::system::error_code ec;
+  if(!boost::filesystem::exists(reply_directory, ec)) {
+    // If the reply directory does not exist, either CMake was not run or the file API is not yet supported
+    return {};
+  }
+
+  // check all target-*.json files and filter for the given file path
+  std::vector<boost::filesystem::path> executables;
+  for(const auto &reply_file : boost::filesystem::directory_iterator(reply_directory)) {
+    if(reply_file.path().stem().string().find("target-") != 0) {
+      continue;
+    }
+
+    JSON json{reply_file.path()};
+    auto artifacts = json.array_optional("artifacts");
+    if(!artifacts || artifacts->empty()) {
+      continue;
+    }
+    auto relative_path = artifacts->front().string_optional("path");
+    if(!relative_path) {
+      continue;
+    }
+
+    auto type = json.string_optional("type");
+    if(!type || *type != "EXECUTABLE") {
+      continue;
+    }
+
+    auto sources = json.array_optional("sources");
+    if(!sources) {
+      continue;
+    }
+    for(const auto &source : *sources) {
+      auto source_path = project_path / source.string_or("path", "");
+      if(source_path == file_path) {
+        executables.emplace_back(build_path / *relative_path);
+      }
+    }
+  }
+  return executables;
+}

src/cmake.hpp

@@ -22,4 +22,8 @@ private:
     std::list<std::string> parameters;
   };
   static void parse_file(const std::string &src, std::map<std::string, std::list<std::string>> &variables, std::function<void(Function &&)> &&on_function);
+
+  // Cmake file API functions
+  void set_file_api_queries(const boost::filesystem::path &build_path);
+  std::vector<boost::filesystem::path> get_executables(const boost::filesystem::path &build_path, const boost::filesystem::path &file_path);
 };

tests/CMakeLists.txt

@@ -34,6 +34,10 @@ if(BUILD_TESTING)
   target_link_libraries(cmake_build_test juci_shared)
   add_test(cmake_build_test cmake_build_test)
 
+  add_executable(cmake_file_api_test cmake_file_api_test.cpp $<TARGET_OBJECTS:test_stubs>)
+  target_link_libraries(cmake_file_api_test juci_shared)
+  add_test(cmake_file_api_test cmake_file_api_test)
+
   add_executable(meson_build_test meson_build_test.cpp $<TARGET_OBJECTS:test_stubs>)
   target_link_libraries(meson_build_test juci_shared)
   add_test(meson_build_test meson_build_test)

tests/cmake_file_api_test.cpp

@@ -0,0 +1,27 @@
+#include "cmake.hpp"
+#include "config.hpp"
+#include "process.hpp"
+#include "project_build.hpp"
+#include <boost/filesystem.hpp>
+#include <glib.h>
+#include <gtksourceviewmm.h>
+
+int main() {
+  auto app = Gtk::Application::create();
+  Gsv::init();
+  Config::get().project.default_build_path = "./build";
+  Config::get().project.cmake.command = "cmake";
+
+  auto tests_path = boost::filesystem::canonical(JUCI_TESTS_PATH);
+  auto cmake_test_files_path = boost::filesystem::canonical(tests_path / "cmake_file_api_test_files");
+
+  CMake cmake(cmake_test_files_path);
+  g_assert(cmake.project_path == cmake_test_files_path);
+
+  auto build = Project::Build::create(cmake_test_files_path);
+  g_assert(dynamic_cast<Project::CMakeBuild *>(build.get()));
+
+  g_assert(build->update_default(true));
+
+  g_assert(build->get_executable(cmake_test_files_path / "main.cpp") == cmake_test_files_path / "build" / "custom_build_folder" / "custom_executable");
+}

tests/cmake_file_api_test_files/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.1)
+
+project(test)
+add_compile_options(-O0 -g)
+
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/custom_build_folder)
+add_executable(cmake_file_api_test_executable main.cpp)
+set_target_properties(cmake_file_api_test_executable PROPERTIES OUTPUT_NAME "custom_executable")

tests/cmake_file_api_test_files/main.cpp

@@ -0,0 +1,4 @@
+int main() {
+  int an_int = 1;
+  an_int++;
+}