refactor check tools install

Author: Jason2866

platform.py

@@ -109,10 +109,17 @@ def configure_default_packages(self, variables, targets):
         if tl_flag:
             # Install tool is not needed anymore
             del self.packages["tl-install"]
-            # Enable check tools only when "check_tool" is enabled
-            for p in self.packages:
-                if p in ("tool-cppcheck", "tool-clangtidy", "tool-pvs-studio"):
-                    self.packages[p]["optional"] = False if str(variables.get("check_tool")).strip("['']") in p else True
+            CHECK_PACKAGES = [
+                "tool-cppcheck",
+                "tool-clangtidy",
+                "tool-pvs-studio"
+            ]
+            # Install check tool listed in pio entry "check_tool"
+            if variables.get("check_tool") is not None:
+                for package in CHECK_PACKAGES:
+                    for check_tool in variables.get("check_tool", ""):
+                        if check_tool in package:
+                            self.packages[package]["optional"] = False
 
         if "arduino" in frameworks:
             self.packages["framework-arduinoespressif32"]["optional"] = False