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LibLine: Add Alt-t shortcut for transposing words

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Nico Weber 2020-08-06 16:52:35 -04:00 • committed by Andreas Kling
parent c1fb5263a5
commit 530fb7eb82
1 changed files with 52 additions and 1 deletions
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53
Libraries/LibLine/Editor.cpp
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@ -591,7 +591,7 @@ void Editor::handle_read_event()
do_cursor_right(Word);
m_state = InputState::Free;
continue;
case ctrl('H'): // ^[^H: alt-backspace: backward delete word
case '\b': // ^[^H: alt-backspace: backward delete word
{
// A word here is contiguous alnums. `foo=bar baz` is three words.
bool has_seen_alnum = false;
@ -644,6 +644,57 @@ void Editor::handle_read_event()
m_state = InputState::Free;
continue;
}
case 't': // ^[t: alt-t: transpose words
{
// A word here is contiguous alnums. `foo=bar baz` is three words.
// 'abcd,.:efg...' should become 'efg...,.:abcd' if caret is after
// 'efg...'. If it's in 'efg', it should become 'efg,.:abcd...'
// with the caret after it, which then becomes 'abcd...,.:efg'
// when alt-t is pressed a second time.
// Move to end of word under (or after) caret.
size_t cursor = m_cursor;
while (cursor < m_buffer.size() && !isalnum(m_buffer[cursor]))
++cursor;
while (cursor < m_buffer.size() && isalnum(m_buffer[cursor]))
++cursor;
// Move left over second word and the space to its right.
size_t end = cursor;
size_t start = cursor;
while (start > 0 && !isalnum(m_buffer[start - 1]))
--start;
while (start > 0 && isalnum(m_buffer[start - 1]))
--start;
size_t start_second_word = start;
// Move left over space between the two words.
while (start > 0 && !isalnum(m_buffer[start - 1]))
--start;
size_t start_gap = start;
// Move left over first word.
while (start > 0 && isalnum(m_buffer[start - 1]))
--start;
if (start != start_gap) {
// To swap the two words, swap each word (and the gap) individually, and then swap the whole range.
auto swap_range = [this](auto from, auto to) {
for (size_t i = 0; i < (to - from) / 2; ++i)
swap(m_buffer[from + i], m_buffer[to - 1 - i]);
};
swap_range(start, start_gap);
swap_range(start_gap, start_second_word);
swap_range(start_second_word, end);
swap_range(start, end);
m_cursor = cursor;
// FIXME: Update anchored styles too.
m_refresh_needed = true;
}
m_state = InputState::Free;
continue;
}
default:
m_state = InputState::Free;
continue;