Make Eel work with Microsoft Edge on Linux

Author: thatfloflo

README.md

@@ -344,7 +344,7 @@ Consult the [documentation for PyInstaller](http://PyInstaller.readthedocs.io/en
 
 ## Microsoft Edge
 
-For Windows 10 users, Microsoft Edge (`eel.start(.., mode='edge')`) is installed by default and a useful fallback if a preferred browser is not installed. See the examples:
+Generally, Microsoft Edge can be installed on both Windows and Linux. However, for users of Windows 10 and 11, Microsoft Edge (`eel.start(.., mode='edge')`) is installed by default, making it a useful fallback if an otherwise preferred browser is not installed. See these examples:
 
 - A Hello World example using Microsoft Edge: [examples/01 - hello_world-Edge/](https://github.com/ChrisKnott/Eel/tree/master/examples/01%20-%20hello_world-Edge)
 - Example implementing browser-fallbacks: [examples/07 - CreateReactApp/eel_CRA.py](https://github.com/ChrisKnott/Eel/tree/master/examples/07%20-%20CreateReactApp/eel_CRA.py)

eel/edge.py

@@ -1,20 +1,35 @@
-import platform
 import subprocess as sps
 import sys
-from typing import List
+from typing import List, Optional
 
 from eel.types import OptionsDictT
 
 name: str = 'Edge'
 
 
-def run(_path: str, options: OptionsDictT, start_urls: List[str]) -> None:
-    cmd = 'start microsoft-edge:{}'.format(start_urls[0])
-    sps.Popen(cmd, stdout=sys.stdout, stderr=sys.stderr, stdin=sps.PIPE, shell=True)
+def run(path: str, options: OptionsDictT, start_urls: List[str]) -> None:
+    if path.startswith('start microsoft-edge:'):
+        cmd = 'start microsoft-edge:{}'.format(start_urls[0])
+        sps.Popen(cmd, stdout=sys.stdout, stderr=sys.stderr, stdin=sps.PIPE, shell=True)
+    else:
+        args: List[str] = options['cmdline_args'] + start_urls
+        sps.Popen([path, '--new-window'] + args,
+                  stdout=sps.PIPE, stderr=sys.stderr, stdin=sps.PIPE)
 
 
-def find_path() -> bool:
-    if platform.system() == 'Windows':
-        return True
+def find_path() -> Optional[str]:
+    if sys.platform in ['win32', 'win64']:
+        return _find_edge_win()
+    elif sys.platform.startswith('linux'):
+        return _find_edge_linux()
+    else:
+        return None
 
-    return False
+
+def _find_edge_linux() -> Optional[str]:
+    import whichcraft as wch
+    return wch.which('microsoft-edge') # type: ignore # whichcraft doesn't currently have type hints
+
+
+def _find_edge_win() -> str:
+    return 'start microsoft-edge:'

examples/01 - hello_world-Edge/hello.py

@@ -1,5 +1,4 @@
 import os
-import platform
 import sys
 
 # Use latest version of Eel from parent directory
@@ -21,18 +20,16 @@ def say_hello_py(x):
 say_hello_py('Python World!')
 eel.say_hello_js('Python World!')   # Call a Javascript function
 
-# Launch example in Microsoft Edge only on Windows 10 and above
-if sys.platform in ['win32', 'win64'] and int(platform.release()) >= 10:
-    eel.start('hello.html', mode='edge')
-else:
-    raise EnvironmentError('Error: System is not Windows 10 or above')
-
-# # Launching Edge can also be gracefully handled as a fall back
-# try:
-#     eel.start('hello.html', mode='chrome-app', size=(300, 200))
-# except EnvironmentError:
-#     # If Chrome isn't found, fallback to Microsoft Edge on Win10 or greater
-#     if sys.platform in ['win32', 'win64'] and int(platform.release()) >= 10:
-#         eel.start('hello.html', mode='edge')
-#     else:
-#         raise
+# Set parameters irrespective of browser choice
+start_page = 'hello.html'
+window_size = (300, 200)
+# Launch example in Microsoft Edge if found
+try:
+    eel.start(start_page, mode='edge', size=window_size)
+except EnvironmentError as exc1:
+    # If Edge isn't found, attempt fallback to Chrome or raise error
+    try:
+        print("Try chrome...")
+        eel.start(start_page, mode='chrome', size=window_size)
+    except EnvironmentError as exc2:
+        raise EnvironmentError(f'{exc1} AND {exc2}')