Add a configurable mouse action to select from the clicked point to the end of the line.

Fixes #3585

docs/changelog.rst

@@ -12,6 +12,9 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
 
 - Support infinite length ligatures (:iss:`3504`)
 
+- Add a configurable mouse action to select from the clicked point to the end of the line.
+  (:iss:`3585`)
+
 - Unicode input kitten: Fix a regression in 0.20.0 that broke keyboard handling
   when the num lock or caps lock modifiers were engaged. (:iss:`3587`)
 
@@ -708,7 +711,7 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
   beam and underline cursors (:iss:`2337` and :pull:`2342`)
 
 - When the application running in the terminal grabs the mouse, pass middle
-  clicks to the application unless :opt:`terminal_select_modifiers` are
+  clicks to the application unless `terminal_select_modifiers` are
   pressed (:iss:`2368`)
 
 - A new ``copy_and_clear_or_interrupt`` function (:iss:`2403`)
@@ -988,7 +991,7 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
   the mouse pointer shape when the terminal programs grabs the pointer
   (:iss:`1808`)
 
-- Add an option :opt:`terminal_select_modifiers` to control which modifiers
+- Add an option `terminal_select_modifiers` to control which modifiers
   are used to override mouse selection even when a terminal application has
   grabbed the mouse (:iss:`1774`)
 

kitty/config.py

@@ -336,6 +336,7 @@ def mouse_selection(func: str, rest: str) -> FuncArgsType:
             'rectangle': defines.MOUSE_SELECTION_RECTANGLE,
             'word': defines.MOUSE_SELECTION_WORD,
             'line': defines.MOUSE_SELECTION_LINE,
+            'line_from_point': defines.MOUSE_SELECTION_LINE_FROM_POINT,
         }
         setattr(mouse_selection, 'code_map', cmap)
     return func, [cmap[rest]]

kitty/config_data.py

@@ -670,7 +670,11 @@ for grabbed in (False, True):
     m('start_rectangle_selection' + name_s, mods_p + 'ctrl+alt+left', 'press', modes, 'mouse_selection rectangle',
       _('Start selecting text in a rectangle') + ts)
     m('select_word' + name_s, mods_p + 'left', 'doublepress', modes, 'mouse_selection word', _('Select a word') + ts)
-    m('select_line' + name_s, mods_p + 'left', 'triplepress', modes, 'mouse_selection line', _('Select a line') + ts)
+    line_desc = ''
+    if not grabbed:
+        line_desc = _('Select the entire line. If you would rather select from the clicked'
+                      ' point to the end of the line, use ``line_at_point`` instead of ``line`` above')
+    m('select_line' + name_s, mods_p + 'left', 'triplepress', modes, 'mouse_selection line', _('Select a line') + ts, line_desc)
 # }}}
 
 # }}}

kitty/fast_data_types.pyi

@@ -15,6 +15,7 @@ MOUSE_SELECTION_EXTEND: int
 MOUSE_SELECTION_NORMAL: int
 MOUSE_SELECTION_WORD: int
 MOUSE_SELECTION_RECTANGLE: int
+MOUSE_SELECTION_LINE_FROM_POINT: int
 KITTY_VCS_REV: str
 NO_CLOSE_REQUESTED: int
 IMPERATIVE_CLOSE_REQUESTED: int

kitty/mouse.c

@@ -580,6 +580,7 @@ typedef enum MouseSelectionType {
     MOUSE_SELECTION_RECTANGLE,
     MOUSE_SELECTION_WORD,
     MOUSE_SELECTION_LINE,
+    MOUSE_SELECTION_LINE_FROM_POINT,
 } MouseSelectionType;
 
 
@@ -607,6 +608,9 @@ mouse_selection(Window *w, int code, int button) {
         case MOUSE_SELECTION_LINE:
             if (screen_selection_range_for_line(screen, w->mouse_pos.cell_y, &start, &end)) S(EXTEND_LINE);
             break;
+        case MOUSE_SELECTION_LINE_FROM_POINT:
+            if (screen_selection_range_for_line(screen, w->mouse_pos.cell_y, &start, &end) && end > w->mouse_pos.cell_x) S(EXTEND_LINE_FROM_POINT);
+            break;
         case MOUSE_SELECTION_EXTEND:
             extend_selection(w, false);
             break;
@@ -821,6 +825,7 @@ init_mouse(PyObject *module) {
     PyModule_AddIntMacro(module, MOUSE_SELECTION_RECTANGLE);
     PyModule_AddIntMacro(module, MOUSE_SELECTION_WORD);
     PyModule_AddIntMacro(module, MOUSE_SELECTION_LINE);
+    PyModule_AddIntMacro(module, MOUSE_SELECTION_LINE_FROM_POINT);
     if (PyModule_AddFunctions(module, module_methods) != 0) return false;
     return true;
 }

kitty/screen.c

@@ -2671,6 +2671,7 @@ screen_update_selection(Screen *self, index_type x, index_type y, bool in_left_h
             if (found_at_end) { b->x = end.x; b->y = end.y; b->in_left_half_of_cell = false; }
             break;
         }
+        case EXTEND_LINE_FROM_POINT:
         case EXTEND_LINE: {
             index_type top_line, bottom_line;
             if (start_extended_selection || y == s->start.y) {
@@ -2691,7 +2692,11 @@ screen_update_selection(Screen *self, index_type x, index_type y, bool in_left_h
             }
             if (screen_selection_range_for_line(self, top_line, &start.x, &start.y) && screen_selection_range_for_line(self, bottom_line, &end.x, &end.y)) {
                 bool multiline = top_line != bottom_line;
-                a->x = multiline ? 0 : start.x; a->y = top_line; a->in_left_half_of_cell = true;
+                if (!multiline && self->selections.extend_mode == EXTEND_LINE_FROM_POINT) {
+                    if (x > end.y) break;
+                    a->x = x;
+                } else a->x = multiline ? 0 : start.x;
+                a->y = top_line; a->in_left_half_of_cell = true;
                 b->x = end.y; b->y = bottom_line; b->in_left_half_of_cell = false;
             }
             break;

kitty/screen.h

@@ -25,7 +25,7 @@ typedef struct {
     bool in_left_half_of_cell;
 } SelectionBoundary;
 
-typedef enum SelectionExtendModes { EXTEND_CELL, EXTEND_WORD, EXTEND_LINE } SelectionExtendMode;
+typedef enum SelectionExtendModes { EXTEND_CELL, EXTEND_WORD, EXTEND_LINE, EXTEND_LINE_FROM_POINT } SelectionExtendMode;
 
 typedef struct {
     index_type x, x_limit;