killswitches: Implement --killswitches-file CL arg

* New CL arge `--killswitches-file`.  This needs to reference a file either
  with an absolute path, or relative to the CWD of the process.
* Internally if the argument is provided it is prefixed with `"file:"` in
  order to actually be loaded.  This is because `requests` doesn't have an
  adapter for `file:` URLs.
* Also fixes a visual bug with reporting of active killswitches.  The entire
  SingleKill object was used instead of just its `reason` property.  mypy
  type checks caught this.

EDMarketConnector.py

@@ -168,6 +168,11 @@ if __name__ == '__main__':  # noqa: C901
         help='Have EDDN plugin show what it is tracking',
         action='store_true',
     )
+
+    parser.add_argument(
+        '--killswitches-file',
+        help='Specify a custom killswitches file',
+    )
     ###########################################################################
 
     args = parser.parse_args()
@@ -1859,10 +1864,13 @@ Locale LC_TIME: {locale.getlocale(locale.LC_TIME)}'''
                  )
 
 
-def setup_killswitches():
+def setup_killswitches(filename: Optional[str]):
     """Download and setup the main killswitch list."""
     logger.debug('fetching killswitches...')
-    killswitch.setup_main_list()
+    if filename is not None:
+        filename = "file:" + filename
+
+    killswitch.setup_main_list(filename)
 
 
 def show_killswitch_poppup(root=None):
@@ -1891,9 +1899,9 @@ def show_killswitch_poppup(root=None):
     for version in kills:
         tk.Label(frame, text=f'Version: {version.version}').grid(row=idx, sticky=tk.W)
         idx += 1
-        for id, reason in version.kills.items():
+        for id, kill in version.kills.items():
             tk.Label(frame, text=id).grid(column=0, row=idx, sticky=tk.W, padx=(10, 0))
-            tk.Label(frame, text=reason).grid(column=1, row=idx, sticky=tk.E, padx=(0, 10))
+            tk.Label(frame, text=kill.reason).grid(column=1, row=idx, sticky=tk.E, padx=(0, 10))
             idx += 1
         idx += 1
 
@@ -2026,7 +2034,8 @@ sys.path: {sys.path}'''
 
     Translations.install(config.get_str('language'))  # Can generate errors so wait til log set up
 
-    setup_killswitches()
+    setup_killswitches(args.killswitches_file)
+
     root = tk.Tk(className=appname.lower())
     if sys.platform != 'win32' and ((f := config.get_str('font')) is not None or f != ''):
         size = config.get_int('font_size', default=-1)

docs/Killswitches.md

@@ -119,10 +119,17 @@ JSON primitives and their python equivalents
 json compound types (`object -- {}` and `array -- []`) may be set.
 
 ### Testing
+You can supply a custom killswitches file for testing against
+EDMarketConnector:
+```bash
+python EDMarketConnector.py --killswitches-file <filename>
+```
+This will be relative to the CWD of the process.
 
-Killswitch files can be tested using the script in `scripts/killswitch_test.py`.
-Providing a file as an argument or `-` for stdin will output the behaviour of
-the provided file, including indicating typos, if applicable.
+Alternatively, killswitch files can be independently tested using the script in
+`scripts/killswitch_test.py`. Providing a file as an argument or `-` for stdin
+will output the behaviour of the provided file, including indicating typos, if
+applicable.
 
 ### Versions
 

killswitch.py

@@ -1,6 +1,7 @@
 """Fetch kill switches from EDMC Repo."""
 from __future__ import annotations
 
+import json
 import threading
 from copy import deepcopy
 from typing import (
@@ -339,6 +340,16 @@ def fetch_kill_switches(target=DEFAULT_KILLSWITCH_URL) -> Optional[KillSwitchJSO
     :return: a list of dicts containing kill switch data, or None
     """
     logger.info("Attempting to fetch kill switches")
+    if target.startswith('file:'):
+        target = target.replace('file:', '')
+        try:
+            with open(target, 'r') as t:
+                return json.load(t)
+
+        except FileNotFoundError:
+            logger.warning(f"No such file '{target}'")
+            return None
+
     try:
         data = requests.get(target, timeout=10).json()
 
@@ -458,13 +469,16 @@ def get_kill_switches_thread(
 active: KillSwitchSet = KillSwitchSet([])
 
 
-def setup_main_list():
+def setup_main_list(filename: Optional[str]):
     """
     Set up the global set of kill switches for querying.
 
     Plugins should NOT call this EVER.
     """
-    if (data := get_kill_switches(DEFAULT_KILLSWITCH_URL, OLD_KILLSWITCH_URL)) is None:
+    if filename is None:
+        filename = DEFAULT_KILLSWITCH_URL
+
+    if (data := get_kill_switches(filename, OLD_KILLSWITCH_URL)) is None:
         logger.warning("Unable to fetch kill switches. Setting global set to an empty set")
         return