Merge pull request psychopy#7514 from TEParsons/dev-enh-prefs-json

ENH: Allow prefs to be set from JSON

Author: TEParsons

psychopy/preferences/preferences.py

@@ -4,6 +4,7 @@
 import errno
 import os
 import sys
+import argparse
 import platform
 from pathlib import Path
 from psychopy import logging
@@ -354,6 +355,21 @@ def loadUserPrefs(self):
 
         return cfg
 
+    def fromJSON(self, file):
+        import json
+
+        # load params from JSON
+        with open(file, "r") as f:
+            spec = json.load(f)
+        params = spec['params']
+        # iterate through relevant sections
+        for section in [self.general, self.hardware, self.piloting]:
+            # iterate through keys
+            for key in section:
+                # if given in the JSON, set value
+                if key in params:
+                    section[key] = params[key]['val']
+    
     @property
     def devices(self):
         if not hasattr(self, "_devices"):
@@ -461,3 +477,17 @@ def restoreBadPrefs(self, cfg, result):
                 print(msg % (', '.join(sectionList), cfg.filename))
 
 prefs = Preferences()
+# parse calling args for any which are prefs relevant
+parser = argparse.ArgumentParser(
+    prog="PsychoPy Preferences",
+    description="Parses arguments relevant to PsychoPy's preferences"
+)
+parser.add_argument(
+    "--prefs-json", 
+    type=Path, 
+    default=None
+)
+args = parser.parse_known_args()[0]
+# load prefs from JSON if one was given
+if args.prefs_json:
+    prefs.fromJSON(args.prefs_json)