3 files changed, 74 insertions, 1 deletions
diff --git a/lib/utils/cache.py b/lib/utils/cache.py
index 767978ca..1ede8ce1 100644
--- a/lib/utils/cache.py
+++ b/lib/utils/cache.py
@@ -10,6 +10,8 @@ import pickle
 import appdirs
 import diskcache
 
+from lib.utils.settings import global_settings
+
 try:
     from functools import lru_cache
 except ImportError:
@@ -29,7 +31,9 @@ def get_stitch_plan_cache():
 
     if __stitch_plan_cache is None:
         cache_dir = os.path.join(appdirs.user_config_dir('inkstitch'), 'cache', 'stitch_plan')
-        __stitch_plan_cache = diskcache.Cache(cache_dir, size=1024 * 1024 * 100)
+        size_limit = global_settings['cache_size'] * 1024 * 1024
+        __stitch_plan_cache = diskcache.Cache(cache_dir, size=size_limit)
+        __stitch_plan_cache.size_limit = size_limit
         atexit.register(__stitch_plan_cache.close)
 
     return __stitch_plan_cache
diff --git a/lib/utils/paths.py b/lib/utils/paths.py
index 2a95f6e7..10d72de9 100755
--- a/lib/utils/paths.py
+++ b/lib/utils/paths.py
@@ -7,6 +7,8 @@ import sys
 import os
 from os.path import dirname, realpath
 
+import appdirs
+
 
 def get_bundled_dir(name):
     if getattr(sys, 'frozen', None) is not None:
@@ -26,3 +28,12 @@ def get_resource_dir(name):
             return realpath(os.path.join(sys._MEIPASS, name))
     else:
         return realpath(os.path.join(dirname(realpath(__file__)), '..', '..', name))
+
+
+def get_user_dir(name=None):
+    path = appdirs.user_config_dir("inkstitch")
+
+    if name is not None:
+        path = os.path.join(path, name)
+
+    return path
diff --git a/lib/utils/settings.py b/lib/utils/settings.py
new file mode 100644
index 00000000..f2ce276d
--- /dev/null
+++ b/lib/utils/settings.py
@@ -0,0 +1,58 @@
+from collections.abc import MutableMapping
+import json
+import os
+
+from .paths import get_user_dir
+
+# These settings are the defaults for SVG metadata settings of the same name in
+# lib.extensions.base.InkstitchMetadata
+DEFAULT_METADATA = {
+    "min_stitch_len_mm": 0,
+    "collapse_len_mm": 3,
+}
+
+DEFAULT_SETTINGS = {
+    "cache_size": 100
+}
+
+
+class GlobalSettings(MutableMapping):
+    def __init__(self):
+        super().__init__()
+        self.__settings_file = os.path.join(get_user_dir(), "settings.json")
+        self.__settings = {}
+
+        for name, value in DEFAULT_METADATA.items():
+            self.__settings[f"default_{name}"] = value
+
+        self.__settings.update(DEFAULT_SETTINGS)
+
+        try:
+            with open(self.__settings_file, 'r') as settings_file:
+                self.__settings.update(json.load(settings_file))
+        except (OSError, json.JSONDecodeError, ValueError):
+            pass
+
+    def __setitem__(self, item, value):
+        self.__settings[item] = value
+
+        with open(self.__settings_file, 'w') as settings_file:
+            json.dump(self.__settings, settings_file)
+
+    def __getitem__(self, item):
+        return self.__settings[item]
+
+    def __delitem__(self, item):
+        del self.__settings[item]
+
+    def __iter__(self):
+        return iter(self.__settings)
+
+    def __len__(self):
+        return len(self.__settings)
+
+    def __json__(self):
+        return self.__settings
+
+
+global_settings = GlobalSettings()