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LibGUI: Add Ctrl-W to insert mode

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In Vim's insert mode, Ctrl-W deletes the word before the cursor, like
Ctrl-Backspace. Unlike Ctrl-Backspace, if only whitespace exists between
the end of the word and the cursor, the word will be deleted with the
whitespace.

To do so, this commit introduces two methods: delete_previous_word() for
TextEditor and first_word_before() for TextDocument, where the former
depends on the latter. delete_previous_word() is then called in
VimEditingEngine.
This commit is contained in:
Ariel Don 2021-07-13 22:12:07 -05:00 • committed by Gunnar Beutner
parent 8f01a8b741
commit 808e5e813f
5 changed files with 52 additions and 0 deletions
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33
Userland/Libraries/LibGUI/TextDocument.cpp
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@ -674,6 +674,39 @@ TextPosition TextDocument::first_word_break_after(const TextPosition& position)
return target;
}
TextPosition TextDocument::first_word_before(const TextPosition& position, bool start_at_column_before) const
{
if (position.column() == 0) {
if (position.line() == 0) {
return TextPosition(0, 0);
}
auto previous_line = this->line(position.line() - 1);
return TextPosition(position.line() - 1, previous_line.length());
}
auto target = position;
auto line = this->line(target.line());
if (target.column() == line.length())
start_at_column_before = 1;
auto nonblank_passed = !is_ascii_blank(line.code_points()[target.column() - start_at_column_before]);
while (target.column() > 0) {
auto prev_code_point = line.code_points()[target.column() - 1];
nonblank_passed |= !is_ascii_blank(prev_code_point);
if (nonblank_passed && is_ascii_blank(prev_code_point)) {
break;
} else if (is_ascii_punctuation(prev_code_point)) {
target.set_column(target.column() - 1);
break;
}
target.set_column(target.column() - 1);
}
return target;
}
void TextDocument::undo()
{
if (!can_undo())