Make it possible to use :open -[twb] without url.

doc/help/commands.asciidoc

@@ -268,7 +268,7 @@ This tries to automatically click on typical _Previous Page_ or _Next Page_ link
 
 [[open]]
 === open
-Syntax: +:open [*--bg*] [*--tab*] [*--window*] 'url'+
+Syntax: +:open [*--bg*] [*--tab*] [*--window*] ['url']+
 
 Open a URL in the current/[count]th tab.
 

doc/help/settings.asciidoc

@@ -7,6 +7,7 @@
 |<<general-ignore-case,ignore-case>>|Whether to find text on a page case-insensitively.
 |<<general-wrap-search,wrap-search>>|Whether to wrap finding text to the top when arriving at the end.
 |<<general-startpage,startpage>>|The default page(s) to open at the start, separated by commas.
+|<<general-default-page,default-page>>|The page to open if :open -t/-b/-w is used without URL.
 |<<general-auto-search,auto-search>>|Whether to start a search when something else than a URL is entered.
 |<<general-auto-save-config,auto-save-config>>|Whether to save the config automatically on quit.
 |<<general-auto-save-interval,auto-save-interval>>|How often (in milliseconds) to auto-save config/cookies/etc.
@@ -257,6 +258,12 @@ The default page(s) to open at the start, separated by commas.
 
 Default: +pass:[https://www.duckduckgo.com]+
 
+[[general-default-page]]
+=== default-page
+The page to open if :open -t/-b/-w is used without URL.
+
+Default: +pass:[${startpage}]+
+
 [[general-auto-search]]
 === auto-search
 Whether to start a search when something else than a URL is entered.

qutebrowser/browser/commands.py

@@ -281,7 +281,7 @@ class CommandDispatcher:
     @cmdutils.register(instance='command-dispatcher', name='open',
                        maxsplit=0, scope='window',
                        completion=[usertypes.Completion.quickmark_by_url])
-    def openurl(self, url, bg=False, tab=False, window=False,
+    def openurl(self, url=None, bg=False, tab=False, window=False,
                 count: {'special': 'count'}=None):
         """Open a URL in the current/[count]th tab.
 
@@ -292,10 +292,17 @@ class CommandDispatcher:
             window: Open in a new window.
             count: The tab index to open the URL in, or None.
         """
-        try:
-            url = urlutils.fuzzy_url(url)
-        except urlutils.FuzzyUrlError as e:
-            raise cmdexc.CommandError(e)
+        if url is None:
+            if tab or bg or window:
+                url = config.get('general', 'default-page')
+            else:
+                raise cmdexc.CommandError("No URL given, but -t/-b/-w is not "
+                                          "set!")
+        else:
+            try:
+                url = urlutils.fuzzy_url(url)
+            except urlutils.FuzzyUrlError as e:
+                raise cmdexc.CommandError(e)
         if tab or bg or window:
             self._open(url, tab, bg, window)
         else:

qutebrowser/config/configdata.py

@@ -131,6 +131,10 @@ DATA = collections.OrderedDict([
          SettingValue(typ.List(), 'https://www.duckduckgo.com'),
          "The default page(s) to open at the start, separated by commas."),
 
+        ('default-page',
+         SettingValue(typ.FuzzyUrl(), '${startpage}'),
+         "The page to open if :open -t/-b/-w is used without URL."),
+
         ('auto-search',
          SettingValue(typ.AutoSearch(), 'naive'),
          "Whether to start a search when something else than a URL is "
@@ -1000,7 +1004,7 @@ KEY_DATA = collections.OrderedDict([
         ('set-cmd-text ":open -b {url}"', ['xO']),
         ('set-cmd-text ":open -w "', ['wo']),
         ('set-cmd-text ":open -w {url}"', ['wO']),
-        ('open -t about:blank', ['ga']),
+        ('open -t', ['ga']),
         ('tab-close', ['d', '<Ctrl-W>']),
         ('tab-close -o', ['D']),
         ('tab-only', ['co']),
@@ -1082,7 +1086,7 @@ KEY_DATA = collections.OrderedDict([
         ('tab-focus last', ['<Ctrl-Tab>']),
         ('enter-mode passthrough', ['<Ctrl-V>']),
         ('quit', ['<Ctrl-Q>']),
-        ('open -t about:blank', ['<Ctrl-T>']),
+        ('open -t', ['<Ctrl-T>']),
         ('scroll-page 0 1', ['<Ctrl-F>']),
         ('scroll-page 0 -1', ['<Ctrl-B>']),
         ('scroll-page 0 0.5', ['<Ctrl-D>']),