Adds a --file flag to :jseval

qutebrowser/browser/commands.py

@@ -1927,12 +1927,13 @@ 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, file=False, quiet=False, *,
                world: typing.Union[usertypes.JsWorld, int]=None):
         """Evaluate a JavaScript string.
 
         Args:
-            js_code: The string to evaluate.
+            js_code: The string/file to evaluate.
+            file: Interpret js-code as a path to a file.
             quiet: Don't show resulting JS object.
             world: Ignored on QtWebKit. On QtWebEngine, a world ID or name to
                    run the snippet in.
@@ -1960,6 +1961,13 @@ class CommandDispatcher:
                         out = out[:5000] + ' [...trimmed...]'
                     message.info(out)
 
+        if file:
+            try:
+                with open(js_code, 'r', encoding='utf-8') as f:
+                    js_code = f.read()
+            except OSError as e:
+                raise cmdexc.CommandError(str(e))
+
         widget = self._current_widget()
         widget.run_js_async(js_code, callback=jseval_cb, world=world)
 

tests/end2end/data/misc/jseval_file.js

@@ -0,0 +1,2 @@
+console.log("Hello from JS!")
+console.log("Hello again from JS!")

tests/end2end/features/misc.feature

@@ -102,6 +102,17 @@ Feature: Various utility commands.
         And I run :jseval --world main do_log()
         Then the javascript message "Hello from the page!" should be logged
 
+    Scenario: :jseval --file using a file that exists as js-code
+        When I set general -> log-javascript-console to info
+        And I run :jseval --file (testdata)/misc/jseval_file.js
+        Then the javascript message "Hello from JS!" should be logged
+        And the javascript message "Hello again from JS!" should be logged
+
+    Scenario: :jseval --file using a file that doesn't exist as js-code
+        When I run :jseval --file nonexistentfile
+        Then the error "[Errno 2] No such file or directory: 'nonexistentfile'" should be shown
+        And "No output or error" should not be logged
+
     # :debug-webaction
 
     Scenario: :debug-webaction with valid value