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LibLine: Add binding for Alt-backspace

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It backward-deletes a word like Ctrl-W, but it has a slightly
different definition of what a word is. For example, with the
caret behind `gcc -fsanitize=address`, Ctrl-W would delete
'-fsanitize=address' but Alt-backspace would only delete 'address'.
This commit is contained in:
Nico Weber 2020-08-06 14:58:47 -04:00 committed by Andreas Kling
parent 2051d690d5
commit c1fb5263a5
Notes: sideshowbarker 2024-07-19 04:11:00 +09:00 
Author: https://github.com/nico
Commit: https://github.com/SerenityOS/serenity/commit/c1fb5263a5d
Pull-request: https://github.com/SerenityOS/serenity/pull/3032
1 changed files with 21 additions and 5 deletions
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26
Libraries/LibLine/Editor.cpp
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@ -42,7 +42,7 @@
// #define SUGGESTIONS_DEBUG
namespace {
u32 ctrl(char c) { return c & 0x3f; }
constexpr u32 ctrl(char c) { return c & 0x3f; }
}
namespace Line {
@ -587,6 +587,26 @@ void Editor::handle_read_event()
do_cursor_left(Word);
m_state = InputState::Free;
continue;
case 'f': // ^[f: alt-f
do_cursor_right(Word);
m_state = InputState::Free;
continue;
case ctrl('H'): // ^[^H: alt-backspace: backward delete word
{
// A word here is contiguous alnums. `foo=bar baz` is three words.
bool has_seen_alnum = false;
while (m_cursor > 0) {
if (!isalnum(m_buffer[m_cursor - 1])) {
if (has_seen_alnum)
break;
} else {
has_seen_alnum = true;
}
do_backspace();
}
m_state = InputState::Free;
continue;
}
case 'd': // ^[d: alt-d: forward delete word
{
// A word here is contiguous alnums. `foo=bar baz` is three words.
@ -603,10 +623,6 @@ void Editor::handle_read_event()
m_state = InputState::Free;
continue;
}
case 'f': // ^[f: alt-f
do_cursor_right(Word);
m_state = InputState::Free;
continue;
case 'c': // ^[c: alt-c: capitalize word
case 'l': // ^[l: alt-l: lowercase word
case 'u': // ^[u: alt-u: uppercase word