A new option strip_trailing_spaces to optionally remove trailing spaces from lines when copying to clipboard.

docs/changelog.rst

@@ -6,6 +6,9 @@ Changelog
 0.13.4 [future]
 ---------------------
 
+- A new option :opt:`strip_trailing_spaces` to optionally remove trailing
+  spaces from lines when copying to clipboard.
+
 - macOS: Fix :kbd:`cmd+period` key not working (:iss:`1318`)
 
 

kitty/config_data.py

@@ -398,6 +398,11 @@ such as macOS that do not have the concept of primary selections. Note
 that this is a security risk, as all programs, including websites open in your
 browser can read the contents of the clipboard.'''))
 
+o('strip_trailing_spaces', 'never', option_type=choices('never', 'smart', 'always'), long_text=_('''
+Remove spaces at the end of lines when copying to clipboard.
+A value of :code:`smart` will do it when using normal selections, but not rectangle
+selections. :code:`always` will always do it.'''))
+
 o('rectangle_select_modifiers', 'ctrl+alt', option_type=to_modifiers, long_text=_('''
 The modifiers to use rectangular selection (i.e. to select text in a
 rectangular block with the mouse)'''))

kitty/screen.c

@@ -1918,6 +1918,13 @@ start_selection(Screen *self, PyObject *args) {
     Py_RETURN_NONE;
 }
 
+static PyObject*
+is_rectangle_select(Screen *self, PyObject *a UNUSED) {
+    PyObject *ans = self->selection.rectangle_select ? Py_True : Py_False;
+    Py_INCREF(ans);
+    return ans;
+}
+
 static PyObject*
 text_for_selection(Screen *self, PyObject *a UNUSED) {
     FullSelectionBoundary start, end;
@@ -2211,6 +2218,7 @@ static PyMethodDef methods[] = {
     MND(set_margins, METH_VARARGS)
     MND(rescale_images, METH_NOARGS)
     MND(text_for_selection, METH_NOARGS)
+    MND(is_rectangle_select, METH_NOARGS)
     MND(scroll, METH_VARARGS)
     MND(send_escape_code_to_child, METH_VARARGS)
     MND(toggle_alt_screen, METH_NOARGS)

kitty/window.py

@@ -451,7 +451,11 @@ class Window:
     # }}}
 
     def text_for_selection(self):
-        return ''.join(self.screen.text_for_selection())
+        lines = self.screen.text_for_selection()
+        if self.opts.strip_trailing_spaces == 'always' or (
+                self.opts.strip_trailing_spaces == 'smart' and not self.screen.is_rectangle_select()):
+            lines = [l.rstrip() for l in lines]
+        return ''.join(lines)
 
     def destroy(self):
         self.destroyed = True