add --sel option to prompt-yank

doc/help/commands.asciidoc

@@ -1404,7 +1404,7 @@ How many steps to zoom out.
 |<<prompt-accept,prompt-accept>>|Accept the current prompt.
 |<<prompt-item-focus,prompt-item-focus>>|Shift the focus of the prompt file completion menu to another item.
 |<<prompt-open-download,prompt-open-download>>|Immediately open a download.
-|<<prompt-yank,prompt-yank>>|Yank URL.
+|<<prompt-yank,prompt-yank>>|Yank URL to clipboard or primary selection.
 |<<rl-backward-char,rl-backward-char>>|Move back a character.
 |<<rl-backward-delete-char,rl-backward-delete-char>>|Delete the character before the cursor.
 |<<rl-backward-kill-word,rl-backward-kill-word>>|Remove chars from the cursor to the beginning of the word.
@@ -1612,7 +1612,12 @@ If no specific command is given, this will use the system's default application
 
 [[prompt-yank]]
 === prompt-yank
-Yank URL.
+Syntax: +:prompt-yank [*--sel*]+
+
+Yank URL to clipboard or primary selection.
+
+==== optional arguments
+* +*-s*+, +*--sel*+: Use the primary selection instead of the clipboard.
 
 [[rl-backward-char]]
 === rl-backward-char

doc/help/settings.asciidoc

@@ -623,11 +623,11 @@ Default:
 * +pass:[<Ctrl-F>]+: +pass:[rl-forward-char]+
 * +pass:[<Ctrl-H>]+: +pass:[rl-backward-delete-char]+
 * +pass:[<Ctrl-K>]+: +pass:[rl-kill-line]+
+* +pass:[<Ctrl-Shift-Y>]+: +pass:[prompt-yank --sel]+
 * +pass:[<Ctrl-U>]+: +pass:[rl-unix-line-discard]+
 * +pass:[<Ctrl-W>]+: +pass:[rl-unix-word-rubout]+
 * +pass:[<Ctrl-X>]+: +pass:[prompt-open-download]+
-* +pass:[<Ctrl-Y>]+: +pass:[rl-yank]+
-* +pass:[<Ctrl-y>]+: +pass:[prompt-yank]+
+* +pass:[<Ctrl-Y>]+: +pass:[prompt-yank]+
 * +pass:[<Down>]+: +pass:[prompt-item-focus next]+
 * +pass:[<Escape>]+: +pass:[leave-mode]+
 * +pass:[<Return>]+: +pass:[prompt-accept]+

qutebrowser/config/configdata.yml

@@ -2349,8 +2349,8 @@ bindings.default:
       <Alt-D>: rl-kill-word
       <Ctrl-W>: rl-unix-word-rubout
       <Alt-Backspace>: rl-backward-kill-word
-      <Ctrl-Y>: rl-yank
-      <Ctrl-y>: prompt-yank
+      <Ctrl-Y>: prompt-yank
+      <Ctrl-Shift-Y>: prompt-yank --sel
       <Ctrl-?>: rl-delete-char
       <Ctrl-H>: rl-backward-delete-char
       <Escape>: leave-mode

qutebrowser/mainwindow/prompt.py

@@ -425,15 +425,23 @@ class PromptContainer(QWidget):
     @cmdutils.register(
         instance='prompt-container', scope='window',
         modes=[usertypes.KeyMode.prompt, usertypes.KeyMode.yesno])
-    def prompt_yank(self):
-        """Yank URL."""
+    def prompt_yank(self, sel=False):
+        """Yank URL to clipboard or primary selection.
+
+        Args:
+            sel: Use the primary selection instead of the clipboard.
+        """
         question = self._prompt.question
         if not question.url:
             message.error('No URL found.')
             return
         s = question.url
-        utils.set_clipboard(s)
-        message.info("Yanked to clipboard: {}".format(s))
+        target = 'primary selection'
+        if not (sel and utils.supports_selection()):
+            target = 'clipboard'
+            sel = False
+        utils.set_clipboard(s, sel)
+        message.info("Yanked to {}: {}".format(target, s))
 
 
 class LineEdit(QLineEdit):