tools/mpremote: Add user configuration on Windows %APPDATE%.

Signed-off-by: Jos Verlinde <jos_verlinde@hotmail.com>

docs/reference/mpremote.rst

@@ -430,8 +430,11 @@ Shortcuts can be defined using the macro system.  Built-in shortcuts are:
 - ``cat``, ``edit``, ``ls``, ``cp``, ``rm``, ``mkdir``, ``rmdir``, ``touch``: Aliases for ``fs <sub-command>``
 
 Additional shortcuts can be defined by in user-configuration files, which is
-located at ``.config/mpremote/config.py``. This file should define a
-dictionary named ``commands``. The keys of this dictionary are the shortcuts
+located at ``.config/mpremote/config.py`` relative to the ``XDG_CONFIG_HOME`` or ``HOME`` environment variable on unix systems
+, or on Windows relative to ``HOME``, ``USERPROFILE`` or ``APPDATA``.
+
+For example:
+ This file should define a dictionary named ``commands``. The keys of this dictionary are the shortcuts
 and the values are either a string or a list-of-strings:
 
 .. code-block:: python3

tools/mpremote/mpremote/main.py

@@ -355,17 +355,23 @@ def load_user_config():
     # Create empty config object.
     config = __build_class__(lambda: None, "Config")()
     config.commands = {}
-
-    # Get config file name.
-    path = os.getenv("XDG_CONFIG_HOME")
-    if path is None:
-        path = os.getenv("HOME")
-        if path is None:
-            return config
-        path = os.path.join(path, ".config")
-    path = os.path.join(path, _PROG)
+    # use $XDG_CONFIG_HOME,$HOME $env:USERPROFILE% or $env:APPDATA
+    path = None
+    for env_var in ("XDG_CONFIG_HOME", "HOME", "USERPROFILE", "APPDATA"):
+        path = os.getenv(env_var)
+        if not path:
+            continue
+        if os.path.exists( os.path.join(path,".config", _PROG, "config.py")):
+            # Unix style
+            path = os.path.join(path,".config", _PROG, "config.py")
+            break
+        elif os.path.exists( os.path.join(path, _PROG, "config.py")):
+            # Windows style
+            path = os.path.join(path, _PROG,"config.py")
+            break
+    if not path:
+        return config
     config_file = os.path.join(path, "config.py")
-
     # Check if config file exists.
     if not os.path.exists(config_file):
         return config
@@ -375,6 +381,9 @@ def load_user_config():
         config_data = f.read()
     prev_cwd = os.getcwd()
     os.chdir(path)
+    # pass in the config path so that the config file can use it
+    config.__dict__["config_path"] = path
+    config.__dict__["__file__"] = config_file
     exec(config_data, config.__dict__)
     os.chdir(prev_cwd)