Add --world to :jseval

doc/help/commands.asciidoc

@@ -438,7 +438,7 @@ Note: Due a bug in Qt, the inspector will show incorrect request headers in the
 
 [[jseval]]
 === jseval
-Syntax: +:jseval [*--quiet*] 'js-code'+
+Syntax: +:jseval [*--quiet*] [*--world* 'world'] 'js-code'+
 
 Evaluate a JavaScript string.
 
@@ -447,6 +447,8 @@ Evaluate a JavaScript string.
 
 ==== optional arguments
 * +*-q*+, +*--quiet*+: Don't show resulting JS object.
+* +*-w*+, +*--world*+: Ignored on QtWebKit. On QtWebEngine, which JS world/context to run the snippet in.
+
 
 ==== note
 * This command does not split arguments after the last argument and handles quotes literally.

qutebrowser/browser/commands.py

@@ -1918,12 +1918,14 @@ class CommandDispatcher:
 
     @cmdutils.register(instance='command-dispatcher', scope='window',
                        maxsplit=0, no_cmd_split=True)
-    def jseval(self, js_code, quiet=False):
+    def jseval(self, js_code, quiet=False, *, world: int=None):
         """Evaluate a JavaScript string.
 
         Args:
             js_code: The string to evaluate.
             quiet: Don't show resulting JS object.
+            world: Ignored on QtWebKit. On QtWebEngine, a world ID to run the
+                   snippet in.
         """
         if quiet:
             jseval_cb = None
@@ -1945,7 +1947,11 @@ class CommandDispatcher:
                         out = out[:5000] + ' [...trimmed...]'
                     message.info(self._win_id, out)
 
-        self._current_widget().run_js_async(js_code, callback=jseval_cb)
+        widget = self._current_widget()
+        if world is None:
+            widget.run_js_async(js_code, callback=jseval_cb)
+        else:
+            widget.run_js_async(js_code, callback=jseval_cb, world=world)
 
     @cmdutils.register(instance='command-dispatcher', scope='window')
     def fake_key(self, keystring, global_=False):

tests/end2end/features/misc.feature

@@ -87,6 +87,28 @@ Feature: Various utility commands.
         When I run :jseval Array(5002).join("x")
         Then the message "x* [...trimmed...]" should be shown
 
+    @qtwebengine_skip
+    Scenario: :jseval with --world on QtWebKit
+        When I set general -> log-javascript-console to info
+        And I run :jseval --world=1 console.log("Hello from JS!");
+        And I wait for the javascript message "Hello from JS!"
+        Then "Ignoring world ID 1" should be logged
+
+    @qtwebkit_skip
+    Scenario: :jseval uses separate world without --world
+        When I set general -> log-javascript-console to info
+        And I open data/misc/jseval.html
+        And I run :jseval do_log()
+        Then the javascript message "Hello from the page!" should not be logged
+        And the javascript message "Uncaught ReferenceError: do_log is not defined" should be logged
+
+    @qtwebkit_skip
+    Scenario: :jseval using the main world
+        When I set general -> log-javascript-console to info
+        And I open data/misc/jseval.html
+        And I run :jseval --world 0 do_log()
+        Then the javascript message "Hello from the page!" should be logged
+
     # :debug-webaction
 
     Scenario: :debug-webaction with valid value