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LibLine: Display suggestions and cycle between them

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With extra color (tm)
This commit also patches the users of LibLine to properly use the new
API
This commit is contained in:
AnotherTest 2020-04-11 19:02:15 +04:30 • committed by Andreas Kling
parent b59a391a78
commit 2fdce695d6
4 changed files with 82 additions and 34 deletions
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62
Libraries/LibLine/Editor.cpp
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@ -280,25 +280,43 @@ String Editor::get_line(const String& prompt)
}
String token = is_empty_token ? String() : String(&m_buffer[token_start], m_cursor - token_start);
Vector<String> suggestions;
if (is_first_token)
suggestions = on_tab_complete_first_token(token);
else
suggestions = on_tab_complete_other_token(token);
// ask for completions only on the first tab
// further tabs simply show the cached completions
if (m_times_tab_pressed == 1) {
if (is_first_token)
m_suggestions = on_tab_complete_first_token(token);
else
m_suggestions = on_tab_complete_other_token(token);
}
if (m_times_tab_pressed > 1 && !suggestions.is_empty()) {
auto current_suggestion_index = m_next_suggestion_index;
if (m_next_suggestion_index < m_suggestions.size()) {
if (!m_last_shown_suggestion.is_null()) {
auto actual_offset = m_times_tab_pressed == 1 ? m_cursor : m_cursor - m_last_shown_suggestion.length() + m_next_suggestion_invariant_offset;
for (size_t i = m_next_suggestion_invariant_offset; i < m_last_shown_suggestion.length(); ++i)
m_buffer.remove(actual_offset);
m_cursor = actual_offset;
m_refresh_needed = true;
}
m_last_shown_suggestion = m_suggestions[m_next_suggestion_index];
insert(m_last_shown_suggestion.substring_view(m_next_suggestion_invariant_offset, m_last_shown_suggestion.length() - m_next_suggestion_invariant_offset));
m_next_suggestion_index = (m_next_suggestion_index + 1) % m_suggestions.size();
} else {
m_next_suggestion_index = 0;
}
if (m_times_tab_pressed > 1 && !m_suggestions.is_empty()) {
size_t longest_suggestion_length = 0;
for (auto& suggestion : suggestions)
for (auto& suggestion : m_suggestions)
longest_suggestion_length = max(longest_suggestion_length, suggestion.length());
size_t num_printed = 0;
size_t lines_used { 1 };
size_t index { 0 };
putchar('\n');
// FIXME: what if we use more lines than the terminal has?
// this would put the actual prompt out of view
for (auto& suggestion : suggestions) {
for (auto& suggestion : m_suggestions) {
size_t next_column = num_printed + suggestion.length() + longest_suggestion_length + 2;
if (next_column > m_num_columns) {
@ -307,9 +325,25 @@ String Editor::get_line(const String& prompt)
num_printed = 0;
}
// show just enough suggestions to fill up the screen
// without moving the prompt out of view
if (lines_used + num_lines() >= m_num_lines)
break;
if (index == current_suggestion_index) {
vt_apply_style({ Style::Foreground(Style::Color::Blue) });
fflush(stdout);
}
num_printed += fprintf(stderr, "%-*s", static_cast<int>(longest_suggestion_length) + 2, suggestion.characters());
m_lines_used_for_last_suggestions = lines_used;
if (index == current_suggestion_index) {
vt_apply_style({});
fflush(stdout);
}
++index;
}
m_lines_used_for_last_suggestions = lines_used;
// adjust for the case that we scroll up after writing the suggestions
if (m_origin_x + lines_used >= m_num_lines) {
@ -318,7 +352,6 @@ String Editor::get_line(const String& prompt)
reposition_cursor();
}
suggestions.clear_with_capacity();
continue;
}
@ -327,10 +360,13 @@ String Editor::get_line(const String& prompt)
// let's clean them up
if (m_lines_used_for_last_suggestions) {
vt_clear_lines(0, m_lines_used_for_last_suggestions);
vt_move_relative(-m_lines_used_for_last_suggestions, 0);
reposition_cursor();
m_refresh_needed = true;
m_lines_used_for_last_suggestions = 0;
}
m_last_shown_suggestion = String::empty();
m_suggestions.clear();
suggest(0, 0);
}
m_times_tab_pressed = 0; // Safe to say if we get here, the user didn't press TAB