Detect app icon location

Previously we could assume the app icon path for Steam apps. Starting
with newer Steam client, this is no longer the case and the icon path
might be located under either of the two paths:

* `<steam_path>/appcache/librarycache/<appid>/<40 hex chars>.jpg` (new)
* `<steam_path/appcache/librarycache/<appid>_icon.jpg`

This also means we have to perform additional IO for each Steam app to
detect the icon location; this is done in `SteamApp.from_appmanifest`.

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## [Unreleased]
+### Fixed
+ - Fix missing app icons for games installed using newer Steam client
+
 ## [1.12.0] - 2024-09-16
 ### Added
  - `--cwd-app` flag to set working directory to the game's installation directory

src/protontricks/steam.py

@@ -1,5 +1,6 @@
 import logging
 import os
+import re
 import string
 import struct
 import zlib
@@ -263,8 +264,31 @@ def from_appmanifest(cls, path, steam_lib_paths, steam_path=None):
 
         # If Steam path was provided, also populate the icon path
         if steam_path:
-            icon_path = \
-                steam_path / "appcache" / "librarycache" / f"{appid}_icon.jpg"
+            # The icon path might be located in one of the two locations:
+            # 1. `<steam_path>/appcache/librarycache/<appid>/<40 hex chars>.jpg
+            # 2. `<steam_path>/appcache/librarycache/<appid>_icon.jpg`
+            #
+            # There doesn't appear to be any other way to determine which is
+            # used other than by checking. This incurs some I/O for each app.
+            icon_path = None
+            library_cache_path = steam_path / "appcache" / "librarycache"
+            try:
+                # Try 1st location. This appears to be the newest, so this
+                # should hopefully be the first match, at least on newer Steam
+                # installations.
+                app_lib_cache_path = library_cache_path / str(appid)
+
+                icon_path = next(
+                    path for path in app_lib_cache_path.iterdir()
+                    if re.match(r"[a-f0-9]{40}\.jpg", path.name)
+                )
+            except (StopIteration, FileNotFoundError):
+                # Try 2nd location
+                icon_path = library_cache_path / f"{appid}_icon.jpg"
+
+                if not icon_path.is_file():
+                    # No icon was found
+                    icon_path = None
 
         # Check if the app requires another app. This is the case with
         # newer versions of Proton, which use Steam Runtimes installed as

tests/test_gui.py

@@ -9,6 +9,7 @@
 from protontricks.gui import (prompt_filesystem_access,
                               select_steam_app_with_gui,
                               select_steam_installation)
+from protontricks.steam import SteamApp
 
 
 @pytest.fixture(scope="function")
@@ -96,16 +97,33 @@ def test_select_game_icons(
         Select a game using the GUI. Ensure that icons are used in the dialog
         whenever available.
         """
-        steam_apps = [
-            steam_app_factory(name="Fake game 1", appid=10),
-            steam_app_factory(name="Fake game 2", appid=20),
-            steam_app_factory(name="Fake game 3", appid=30),
-        ]
+        steam_app_factory(name="Fake game 1", appid=10)
+        steam_app_factory(name="Fake game 2", appid=20)
+        steam_app_factory(name="Fake game 3", appid=30)
 
         # Create icons for game 1 and 3
-        for appid in (10, 30):
-            Image.new("RGB", (32, 32)).save(
-                steam_dir / "appcache" / "librarycache" / f"{appid}_icon.jpg")
+        # Old location for 10
+        Image.new("RGB", (32, 32)).save(
+            steam_dir / "appcache" / "librarycache" / "10_icon.jpg"
+        )
+
+        # New location for 30
+        (steam_dir / "appcache" / "librarycache" / "30").mkdir()
+        Image.new("RGB", (32, 32)).save(
+            steam_dir / "appcache" / "librarycache" / "30"
+            / "ffffffffffffffffffffffffffffffffffffffff.jpg"
+        )
+
+        # Read Steam apps using `SteamApp.from_appmanifest` to ensure
+        # icon paths are detected correctly
+        steam_apps = [
+            SteamApp.from_appmanifest(
+                steam_dir / "steamapps" / f"appmanifest_{appid}.acf",
+                steam_path=steam_dir,
+                steam_lib_paths=[steam_dir]
+            )
+            for appid in (10, 20, 30)
+        ]
 
         gui_provider.mock_stdout = "Fake game 2: 20"
         select_steam_app_with_gui(steam_apps=steam_apps, steam_path=steam_dir)
@@ -114,7 +132,8 @@ def test_select_game_icons(
 
         assert b"librarycache/10_icon.jpg\nFake game 1" in input_
         assert b"icon_placeholder.png\nFake game 2" in input_
-        assert b"librarycache/30_icon.jpg\nFake game 3" in input_
+        assert b"librarycache/30/ffffffffffffffffffffffffffffffffffffffff.jpg\nFake game 3" \
+            in input_
 
     def test_select_game_icons_ensure_resize(
             self, gui_provider, steam_app_factory, steam_dir, home_dir):

tests/test_steam.py

@@ -52,8 +52,6 @@ def test_steam_app_from_appmanifest_and_steam_path(
 
         assert steam_app.name == "Fake game"
         assert steam_app.appid == 10
-        assert steam_app.icon_path \
-            == steam_dir / "appcache" / "librarycache" / "10_icon.jpg"
 
     @pytest.mark.parametrize(
         "content",