fix: harden cmake_easy_setup

Now detects and warns when arduino-cli is misconfigured,
and falls back to a sensible default value for userlibs.

Author: massonal

Diff for: cmake/scripts/cmake_easy_setup.py

@@ -122,18 +122,29 @@ def get_boards(boardstxt):
         libpaths[line["location"]] = pathlib.Path(line["dir"])
 
 # platform lib path is already known, obviously, since that's where this script resides
-userlibs = pathlib.Path(libpaths["user"])
-if userlibs.exists():
-    userlibs = userlibs.resolve()
-    libs = [u.name for u in userlibs.iterdir() if u.is_dir()]
-else:
+if "user" in libpaths.keys() :
+    userlibs = pathlib.Path(libpaths["user"])
+    if userlibs.exists():
+        userlibs = userlibs.resolve()
+        libs = [u.name for u in userlibs.iterdir() if u.is_dir()]
+    else:
+        print(
+            f"""Warning: Cannot find {userlibs}.
+        This has likely to do with your arduino-cli configuration.
+        Please refer to the following link for setup details:
+        https://arduino.github.io/arduino-cli/latest/getting-started/#create-a-configuration-file
+        """
+        )
+        libs = list()
+else :
     print(
-        f"""Warning: Cannot find {userlibs}.
+        """No user library path found through arduino-cli (falling back to "~/Arduino/libraries").
     This has likely to do with your arduino-cli configuration.
     Please refer to the following link for setup details:
     https://arduino.github.io/arduino-cli/latest/getting-started/#create-a-configuration-file
     """
     )
+    userlibs = pathlib.Path.home()/"Arduino/libraries"
     libs = list()
 
 corepath = pathlib.Path(__file__).parent.parent.parent.resolve()