Enables projectile switching between C/C++ files

.emacs

@@ -511,6 +511,73 @@
 		:test "ng test --progress=false"
 		:run "ng serve"
 		:test-suffix ".spec")
+	(defun atu/cmake-cc-inference (dir)
+		"Detects if the current root is a CMake C/C++ project"
+		(let ((cmakelists-file (projectile-expand-root "CMakeLists.txt" dir)))
+			(if (file-exists-p cmakelists-file)
+				(with-temp-buffer
+					(insert-file-contents cmakelists-file)
+					(goto-char (point-min))
+					(re-search-forward "project[[:space:]]*([^)]+\\([[:space:]]C\\(XX\\)?[[:space:]]\\)[^)]+)" nil t)
+					)))
+		)
+
+	(defun atu/cc-related-files (path)
+		"Returns related files path for a C/C++ file for a given path"
+		(let* (
+			      (ext (file-name-extension path))
+			      (basename (file-name-base path))
+			      (dirpath (file-name-directory path))
+			      (impl-rx "\\([.-]?[Ii]mp[l]?\\)$")
+			      )
+			(if (member ext '("h" "hh" "hpp"))
+				(if (string-match impl-rx basename)
+					(list :other (concat dirpath
+						             (string-replace
+							             (match-string 1 basename)
+							             ""
+							             basename)
+						             "."
+						             ext))
+					(list :other
+						(mapcar (lambda (sfx) (concat dirpath basename sfx))
+							(list
+								(concat "Imp." ext)
+								(concat "Impl." ext)
+								(concat "imp." ext)
+								(concat "impl." ext)
+								(concat ".Imp." ext)
+								(concat ".Impl." ext)
+								(concat ".imp." ext)
+								(concat ".impl." ext)
+								(concat "-Imp." ext)
+								(concat "-Impl." ext)
+								(concat "-imp." ext)
+								(concat "-impl." ext)
+								".cpp"
+								)))
+					)
+				(when (member ext '("c" "cc" "cpp"))
+					(list :other
+						(mapcar (lambda (sfx) (concat dirpath basename sfx))
+							'( ".h" ".hh" ".hpp" )))
+					)
+				)
+			)
+		)
+
+	(projectile-register-project-type 'cmake-cc #'atu/cmake-cc-inference
+		:project-file "CMakeLists.txt"
+		:configure "cmake -S . -B build -DCMAKE_EXPORT_COMPILE_COMMANDS=On"
+		:compile "cmake --build build"
+		:test "cmake --build build --target check"
+		:related-files-fn
+		(list
+			#'atu/cc-related-files
+			(projectile-related-files-fn-test-with-suffix "cpp" "Test")
+			(projectile-related-files-fn-test-with-suffix "cpp" "UTest")
+			)
+		)
 	)
 
 (use-package vterm)