handle XDG_CONFIG_HOME specification ...

+ fix bug that caused duplicate artist color entries to db
+ check if app is windows (prep for windows build)
+ remove caribou migrations lib
+ rename all api blueprints to "api"
+ unregister child directories when customizing root dirs
+ misc

app/settings.py

@@ -1,16 +1,42 @@
 """
 Contains default configs
 """
-import multiprocessing
 import os
 
+
+# ------- HELPER METHODS --------
+def get_xdg_config_dir():
+    """
+    Returns the XDG_CONFIG_HOME environment variable if it exists, otherwise
+    returns the default config directory. If none of those exist, returns the
+    user's home directory.
+    """
+    xdg_config_home = os.environ.get("XDG_CONFIG_HOME")
+
+    if xdg_config_home:
+        return xdg_config_home
+
+    try:
+        alt_dir = os.path.join(os.environ.get("HOME"), ".config")
+
+        if os.path.exists(alt_dir):
+            return alt_dir
+    except TypeError:
+        return os.path.expanduser("~")
+
+
+# ------- HELPER METHODS --------
+
+
 APP_VERSION = "Swing v.1.0.0.beta.1"
 
 # paths
-CONFIG_FOLDER = ".swing"
-HOME_DIR = os.path.expanduser("~")
+XDG_CONFIG_DIR = get_xdg_config_dir()
+USER_HOME_DIR = os.path.expanduser("~")
 
-APP_DIR = os.path.join(HOME_DIR, CONFIG_FOLDER)
+CONFIG_FOLDER = "swing" if XDG_CONFIG_DIR != USER_HOME_DIR else ".swing"
+
+APP_DIR = os.path.join(XDG_CONFIG_DIR, CONFIG_FOLDER)
 IMG_PATH = os.path.join(APP_DIR, "images")
 
 ARTIST_IMG_PATH = os.path.join(IMG_PATH, "artists")
@@ -37,8 +63,6 @@ DEFAULT_ARTIST_IMG = IMG_ARTIST_URI + "0.webp"
 
 LAST_FM_API_KEY = "762db7a44a9e6fb5585661f5f2bdf23a"
 
-CPU_COUNT = multiprocessing.cpu_count()
-
 THUMB_SIZE = 400
 SM_THUMB_SIZE = 64
 SM_ARTIST_IMG_SIZE = 64
@@ -46,24 +70,9 @@ SM_ARTIST_IMG_SIZE = 64
 The size of extracted images in pixels
 """
 
-LOGGER_ENABLE: bool = True
-
 FILES = ["flac", "mp3", "wav", "m4a"]
 SUPPORTED_FILES = tuple(f".{file}" for file in FILES)
 
-SUPPORTED_IMAGES = (".jpg", ".png", ".webp", ".jpeg")
-
-SUPPORTED_DIR_IMAGES = [
-    "folder",
-    "cover",
-    "album",
-    "front",
-]
-
-# ===== DB =========
-USE_MONGO = False
-
-
 # ===== SQLite =====
 APP_DB_NAME = "swing.db"
 USER_DATA_DB_NAME = "userdata.db"