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Shell: Add (basic) support for history event designators

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Closes #4888
This commit is contained in:
AnotherTest 2021-01-11 13:04:59 +03:30 • committed by Andreas Kling
parent 15fde85b21
commit 239472ba69
9 changed files with 457 additions and 19 deletions
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151
Userland/Shell/AST.cpp
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@ -1201,6 +1201,157 @@ Glob::~Glob()
{
}
void HistoryEvent::dump(int level) const
{
Node::dump(level);
print_indented("Event Selector", level + 1);
switch (m_selector.event.kind) {
case HistorySelector::EventKind::IndexFromStart:
print_indented("IndexFromStart", level + 2);
break;
case HistorySelector::EventKind::IndexFromEnd:
print_indented("IndexFromEnd", level + 2);
break;
case HistorySelector::EventKind::ContainingStringLookup:
print_indented("ContainingStringLookup", level + 2);
break;
case HistorySelector::EventKind::StartingStringLookup:
print_indented("StartingStringLookup", level + 2);
break;
}
print_indented(String::formatted("{}({})", m_selector.event.index, m_selector.event.text), level + 3);
print_indented("Word Selector", level + 1);
auto print_word_selector = [&](const HistorySelector::WordSelector& selector) {
switch (selector.kind) {
case HistorySelector::WordSelectorKind::Index:
print_indented(String::formatted("Index {}", selector.selector), level + 3);
break;
case HistorySelector::WordSelectorKind::Last:
print_indented(String::formatted("Last"), level + 3);
break;
}
};
if (m_selector.word_selector_range.end.has_value()) {
print_indented("Range Start", level + 2);
print_word_selector(m_selector.word_selector_range.start);
print_indented("Range End", level + 2);
print_word_selector(m_selector.word_selector_range.end.value());
} else {
print_indented("Direct Address", level + 2);
print_word_selector(m_selector.word_selector_range.start);
}
}
RefPtr<Value> HistoryEvent::run(RefPtr<Shell> shell)
{
if (!shell)
return create<AST::ListValue>({});
auto editor = shell->editor();
if (!editor) {
shell->raise_error(Shell::ShellError::EvaluatedSyntaxError, "No history available!", position());
return create<AST::ListValue>({});
}
auto& history = editor->history();
// FIXME: Implement reverse iterators and find()?
auto find_reverse = [](auto it_start, auto it_end, auto finder) {
auto it = it_end;
while (it != it_start) {
--it;
if (finder(*it))
return it;
}
return it_end;
};
// First, resolve the event itself.
String resolved_history;
switch (m_selector.event.kind) {
case HistorySelector::EventKind::IndexFromStart:
if (m_selector.event.index >= history.size()) {
shell->raise_error(Shell::ShellError::EvaluatedSyntaxError, "History event index out of bounds", m_selector.event.text_position);
return create<AST::ListValue>({});
}
resolved_history = history[m_selector.event.index].entry;
break;
case HistorySelector::EventKind::IndexFromEnd:
if (m_selector.event.index >= history.size()) {
shell->raise_error(Shell::ShellError::EvaluatedSyntaxError, "History event index out of bounds", m_selector.event.text_position);
return create<AST::ListValue>({});
}
resolved_history = history[history.size() - m_selector.event.index - 1].entry;
break;
case HistorySelector::EventKind::ContainingStringLookup: {
auto it = find_reverse(history.begin(), history.end(), [&](auto& entry) { return entry.entry.contains(m_selector.event.text); });
if (it.is_end()) {
shell->raise_error(Shell::ShellError::EvaluatedSyntaxError, "History event did not match any entry", m_selector.event.text_position);
return create<AST::ListValue>({});
}
resolved_history = it->entry;
break;
}
case HistorySelector::EventKind::StartingStringLookup: {
auto it = find_reverse(history.begin(), history.end(), [&](auto& entry) { return entry.entry.starts_with(m_selector.event.text); });
if (it.is_end()) {
shell->raise_error(Shell::ShellError::EvaluatedSyntaxError, "History event did not match any entry", m_selector.event.text_position);
return create<AST::ListValue>({});
}
resolved_history = it->entry;
break;
}
}
// Then, split it up to "words".
auto nodes = Parser { resolved_history }.parse_as_multiple_expressions();
// Now take the "words" as described by the word selectors.
bool is_range = m_selector.word_selector_range.end.has_value();
if (is_range) {
auto start_index = m_selector.word_selector_range.start.resolve(nodes.size());
auto end_index = m_selector.word_selector_range.end->resolve(nodes.size());
if (start_index >= nodes.size()) {
shell->raise_error(Shell::ShellError::EvaluatedSyntaxError, "History word index out of bounds", m_selector.word_selector_range.start.position);
return create<AST::ListValue>({});
}
if (end_index >= nodes.size()) {
shell->raise_error(Shell::ShellError::EvaluatedSyntaxError, "History word index out of bounds", m_selector.word_selector_range.end->position);
return create<AST::ListValue>({});
}
decltype(nodes) resolved_nodes;
resolved_nodes.append(nodes.data() + start_index, end_index - start_index + 1);
NonnullRefPtr<AST::Node> list = create<AST::ListConcatenate>(position(), move(resolved_nodes));
return list->run(shell);
}
auto index = m_selector.word_selector_range.start.resolve(nodes.size());
if (index >= nodes.size()) {
shell->raise_error(Shell::ShellError::EvaluatedSyntaxError, "History word index out of bounds", m_selector.word_selector_range.start.position);
return create<AST::ListValue>({});
}
return nodes[index].run(shell);
}
void HistoryEvent::highlight_in_editor(Line::Editor& editor, Shell&, HighlightMetadata metadata)
{
Line::Style style { Line::Style::Foreground(Line::Style::XtermColor::Green) };
if (metadata.is_first_in_list)
style.unify_with({ Line::Style::Bold });
editor.stylize({ m_position.start_offset, m_position.end_offset }, move(style));
}
HistoryEvent::HistoryEvent(Position position, HistorySelector selector)
: Node(move(position))
, m_selector(move(selector))
{
}
HistoryEvent::~HistoryEvent()
{
}
void Execute::dump(int level) const
{
Node::dump(level);