Add option select_by_word_characters_forward

This adds an option to select separate characters for forward and
backward word extension on double click. If it is empty the old behavior
is preserved. This is the default.

If it is not empty, select_by_word_characters_forward will be used for
extending the selection in forward direction (right) and
select_by_word_characters will be used for extending in backward
direction (left).

Signed-off-by: Konrad Gräfe <kgraefe@paktolos.net>

kitty/options/definition.py

@@ -492,6 +492,18 @@ Unicode database will be matched.
 '''
     )
 
+opt('select_by_word_characters_forward', '',
+    ctype='!select_by_word_characters_forward',
+    long_text='''
+Characters considered part of a word when extending the selection forward on
+double clicking. In addition to these characters any character that is marked
+as an alphanumeric character in the Unicode database will be matched.
+
+If empty (default) :opt:`select_by_word_characters` will be used for both
+directions.
+'''
+    )
+
 opt('click_interval', '-1.0',
     option_type='float', ctype='time',
     long_text='''

kitty/options/parse.py

@@ -1163,6 +1163,9 @@ class Parser:
     def select_by_word_characters(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
         ans['select_by_word_characters'] = str(val)
 
+    def select_by_word_characters_forward(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['select_by_word_characters_forward'] = str(val)
+
     def selection_background(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
         ans['selection_background'] = to_color_or_none(val)
 

kitty/options/to-c-generated.h

@@ -304,6 +304,19 @@ convert_from_opts_select_by_word_characters(PyObject *py_opts, Options *opts) {
     Py_DECREF(ret);
 }
 
+static void
+convert_from_python_select_by_word_characters_forward(PyObject *val, Options *opts) {
+    select_by_word_characters_forward(val, opts);
+}
+
+static void
+convert_from_opts_select_by_word_characters_forward(PyObject *py_opts, Options *opts) {
+    PyObject *ret = PyObject_GetAttrString(py_opts, "select_by_word_characters_forward");
+    if (ret == NULL) return;
+    convert_from_python_select_by_word_characters_forward(ret, opts);
+    Py_DECREF(ret);
+}
+
 static void
 convert_from_python_click_interval(PyObject *val, Options *opts) {
     opts->click_interval = parse_s_double_to_monotonic_t(val);
@@ -1067,6 +1080,8 @@ convert_opts_from_python_opts(PyObject *py_opts, Options *opts) {
     if (PyErr_Occurred()) return false;
     convert_from_opts_select_by_word_characters(py_opts, opts);
     if (PyErr_Occurred()) return false;
+    convert_from_opts_select_by_word_characters_forward(py_opts, opts);
+    if (PyErr_Occurred()) return false;
     convert_from_opts_click_interval(py_opts, opts);
     if (PyErr_Occurred()) return false;
     convert_from_opts_focus_follows_mouse(py_opts, opts);

kitty/options/to-c.h

@@ -187,6 +187,12 @@ select_by_word_characters(PyObject *chars, Options *opts) {
     opts->select_by_word_characters = list_of_chars(chars);
 }
 
+static void
+select_by_word_characters_forward(PyObject *chars, Options *opts) {
+    free(opts->select_by_word_characters_forward);
+    opts->select_by_word_characters_forward = list_of_chars(chars);
+}
+
 static void
 tab_bar_style(PyObject *val, Options *opts) {
     opts->tab_bar_hidden = PyUnicode_CompareWithASCIIString(val, "hidden") == 0 ? true: false;

kitty/options/types.py

@@ -411,6 +411,7 @@ option_names = (  # {{{
  'scrollback_pager',
  'scrollback_pager_history_size',
  'select_by_word_characters',
+ 'select_by_word_characters_forward',
  'selection_background',
  'selection_foreground',
  'shell',
@@ -561,6 +562,7 @@ class Options:
     scrollback_pager: typing.List[str] = ['less', '--chop-long-lines', '--RAW-CONTROL-CHARS', '+INPUT_LINE_NUMBER']
     scrollback_pager_history_size: int = 0
     select_by_word_characters: str = '@-./_~?&=%+#'
+    select_by_word_characters_forward: str = ''
     selection_background: typing.Optional[kitty.fast_data_types.Color] = Color(255, 250, 205)
     selection_foreground: typing.Optional[kitty.fast_data_types.Color] = Color(0, 0, 0)
     shell: str = '.'