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Shell: Be more smart with pasted stuff

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Shell can now use LibLine's `on_paste` hook to more intelligently escape
pasted data, with the following heuristics:
- If the current command is invalid, just pile the pasted string on top
- If the cursor is *after* a command node, escape the pasted data,
  whichever way yields a smaller encoding
- If the cursor is at the start of or in the middle of a command name,
  paste the data as-is, assuming that the user wants to paste code
- If the cursor is otherwise in some argument, escape the pasted data
  according to which kind of string the cursor is in the middle of
  (double-quoted, single-quoted or a simple bareword)
This commit is contained in:
Ali Mohammad Pur 2022-03-06 13:04:31 +03:30 • committed by Andreas Kling
parent c4d9377477
commit a76730823a
3 changed files with 148 additions and 66 deletions
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73
Userland/Shell/main.cpp
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@ -82,6 +82,79 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
editor->on_tab_complete = [&](const Line::Editor&) {
return shell->complete();
};
editor->on_paste = [&](Utf32View data, Line::Editor& editor) {
auto line = editor.line(editor.cursor());
Shell::Parser parser(line, false);
auto ast = parser.parse();
if (!ast) {
editor.insert(data);
return;
}
auto hit_test_result = ast->hit_test_position(editor.cursor());
// If the argument isn't meant to be an entire command, escape it.
// This allows copy-pasting entire commands where commands are expected, and otherwise escapes everything.
auto should_escape = false;
if (!hit_test_result.matching_node && hit_test_result.closest_command_node) {
// There's *some* command, but our cursor is immediate after it
should_escape = editor.cursor() >= hit_test_result.closest_command_node->position().end_offset;
hit_test_result.matching_node = hit_test_result.closest_command_node;
} else if (hit_test_result.matching_node && hit_test_result.closest_command_node) {
// There's a command, and we're at the end of or in the middle of some node.
auto leftmost_literal = hit_test_result.closest_command_node->leftmost_trivial_literal();
if (leftmost_literal)
should_escape = !hit_test_result.matching_node->position().contains(leftmost_literal->position().start_offset);
}
if (should_escape) {
String escaped_string;
Optional<char> trivia {};
bool starting_trivia_already_provided = false;
auto escape_mode = Shell::Shell::EscapeMode::Bareword;
if (hit_test_result.matching_node->kind() == Shell::AST::Node::Kind::StringLiteral) {
// If we're pasting in a string literal, make sure to only consider that specific escape mode
auto* node = static_cast<Shell::AST::StringLiteral const*>(hit_test_result.matching_node.ptr());
switch (node->enclosure_type()) {
case Shell::AST::StringLiteral::EnclosureType::None:
break;
case Shell::AST::StringLiteral::EnclosureType::SingleQuotes:
escape_mode = Shell::Shell::EscapeMode::SingleQuotedString;
trivia = '\'';
starting_trivia_already_provided = true;
break;
case Shell::AST::StringLiteral::EnclosureType::DoubleQuotes:
escape_mode = Shell::Shell::EscapeMode::DoubleQuotedString;
trivia = '"';
starting_trivia_already_provided = true;
break;
}
}
if (starting_trivia_already_provided) {
escaped_string = shell->escape_token(data, escape_mode);
} else {
escaped_string = shell->escape_token(data, Shell::Shell::EscapeMode::Bareword);
if (auto string = shell->escape_token(data, Shell::Shell::EscapeMode::SingleQuotedString); string.length() + 2 < escaped_string.length()) {
escaped_string = move(string);
trivia = '\'';
}
if (auto string = shell->escape_token(data, Shell::Shell::EscapeMode::DoubleQuotedString); string.length() + 2 < escaped_string.length()) {
escaped_string = move(string);
trivia = '"';
}
}
if (trivia.has_value() && !starting_trivia_already_provided)
editor.insert(*trivia);
editor.insert(escaped_string);
if (trivia.has_value())
editor.insert(*trivia);
} else {
editor.insert(data);
}
};
};
const char* command_to_run = nullptr;