Allow using the pipe command to send screen and scrollback contents directly to the clipboard

See #1693

docs/changelog.rst

@@ -29,6 +29,9 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
   option to have the kitten wait till copying to clipboard is complete
   (:iss:`1693`)
 
+- Allow using the :doc:`pipe <pipe>` command to send screen and scrollback
+  contents directly to the clipboard (:iss:`1693`)
+
 - Linux: Disable the Wayland backend on GNOME by default as GNOME has no
   support for server side decorations. Can be controlled by
   :opt:`linux_display_server`.

docs/pipe.rst

@@ -43,6 +43,10 @@ You can choose where to run the pipe program:
 ``tab``
    A new window in a new tab
 
+``clipboard, primary``
+   Copy the text directly to the clipboard. In this case the specified program
+   is not run, so use some dummy program name for it.
+
 ``none``
    Run it in the background
 

kitty/boss.py

@@ -910,6 +910,11 @@ class Boss:
                 tm.new_tab(special_window=create_window(), cwd_from=cwd_from)
         elif dest == 'os_window':
             self._new_os_window(create_window(), cwd_from=cwd_from)
+        elif dest in ('clipboard', 'primary'):
+            env, stdin = self.process_stdin_source(stdin=source, window=window)
+            if stdin:
+                func = set_clipboard_string if dest == 'clipboard' else set_primary_selection
+                func(stdin)
         else:
             import subprocess
             env, stdin = self.process_stdin_source(stdin=source, window=window)

kitty/glfw.c

@@ -843,7 +843,8 @@ get_content_scale_for_window(PYNOARG) {
 static PyObject*
 set_clipboard_string(PyObject UNUSED *self, PyObject *args) {
     char *title;
-    if(!PyArg_ParseTuple(args, "s", &title)) return NULL;
+    Py_ssize_t sz;
+    if(!PyArg_ParseTuple(args, "s#", &title, &sz)) return NULL;
     OSWindow *w = current_os_window();
     if (w) glfwSetClipboardString(w->handle, title);
     Py_RETURN_NONE;
@@ -987,7 +988,8 @@ get_primary_selection(PYNOARG) {
 static PyObject*
 set_primary_selection(PyObject UNUSED *self, PyObject *args) {
     char *text;
-    if (!PyArg_ParseTuple(args, "s", &text)) return NULL;
+    Py_ssize_t sz;
+    if (!PyArg_ParseTuple(args, "s#", &text, &sz)) return NULL;
     if (glfwSetPrimarySelectionString) {
         OSWindow *w = current_os_window();
         if (w) glfwSetPrimarySelectionString(w->handle, text);