Implement boardfile override in buildenv

Makes it easier to have local modifications on the boardfile. (e.g.
custom LED's.

README.md

@@ -65,20 +65,18 @@ If `socat` is installed, a proxy will be started for every device that connectio
 After installation the `pyduin` module can be imported.
 ```python
 from pyduin import arduino
-from pyduin import _utils as utils
 
 board = 'nanoatmega328'
-boardfile = utils.board_boardfile(board)
 
 Arduino = arduino.Arduino(board=board,
                           tty='/dev/ttyUSB0',
-                          boardfile=boardfile,
                           wait=True)
 print(Arduino.firmware_version)
 pin = Arduino.get_pin(13)
 pin.set_mode('OUTPUT')
 pin.high()
 print(Arduino.free_memory)
+
 ```
 
 ## Command-line

src/pyduin/arduino.py

@@ -34,7 +34,7 @@ def __init__(self,  board=False, tty=False, baudrate=False, boardfile=False,
         self.board = board
         self.tty = tty
         self.baudrate = baudrate
-        self._boardfile = boardfile or utils.board_boardfile(board)
+        self._boardfile = boardfile or utils.boardfile_for(board)
         self.boardfile = False
         self.ready = False
         self.wait = wait

src/pyduin/arduino_cli.py

@@ -51,7 +51,7 @@ def get_basic_config(args):
     board = args.board or utils.get_buddy_cfg(cfg, args.buddy, 'board')
 
     if board:
-        cfg['boardfile'] = args.boardfile or utils.board_boardfile(board)
+        cfg['boardfile'] = args.boardfile or utils.boardfile_for(board)
         logger.debug("Using boardfile from: %s", cfg['boardfile'])
         cfg['board'] = board
     else:
@@ -78,8 +78,7 @@ def _get_arduino_config(args, config):
     arduino_config['tty'] = arduino_config.get('tty', False)
     arduino_config['baudrate'] = arduino_config.get('baudrate', False)
     if not arduino_config.get('boardfile'):
-        boardfile = os.path.join(utils.boardfiledir, f'{arduino_config["board"]}.yml')
-        arduino_config['boardfile'] = boardfile
+        arduino_config['boardfile'] = config['boardfile']
     logger.debug("device_config: %s", arduino_config)
     config['_arduino_'] = arduino_config
     model = config['_arduino_']['board']

src/pyduin/utils.py

@@ -51,6 +51,8 @@ class PyduinUtils:
     """ Wrapper for some useful functions. Exists, to be able to make
     use of @propget decorator and ease handling on the usage side """
 
+    _configfile = os.path.expanduser('~/.pyduin.yml')
+    _workdir = os.path.expanduser('~/.pyduin')
     @staticmethod
     def logger():
         """ Return the pyduin log facility
@@ -69,6 +71,17 @@ def boardfiledir(self):
         """ Return the directory within the package, where the boardfiles resied """
         return os.path.join(self.package_root, 'data', 'boardfiles')
 
+    @property
+    def configfile(self):
+        """ Return the default path to the users config file """
+        return self._configfile
+
+    @property
+    def workdir(self):
+        """ Return the directory where the build environments live """
+        return self._workdir
+
+
     @property
     def firmwaredir(self):
         """ Return the directory within the package, where the firmware resides """
@@ -100,8 +113,11 @@ def platformio_ini(self):
         """ Return the pull path to default platformio.ini """
         return os.path.join(self.firmwaredir, 'platformio.ini')
 
-    def board_boardfile(self, board):
+    def boardfile_for(self, board):
         """ Return the full path to a specific boardfile in the package """
+        # check for overrides in workdir
+        if os.path.isfile(os.path.join(self.workdir, board, f'{board}.yml')):
+            return os.path.join(self.workdir, board, f'{board}.yml')
         return os.path.join(self.boardfiledir, f'{board}.yml')
 
     @staticmethod