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Shell: Add support for the '!' POSIX pipeline prefix
This prefix simply inverts the exit code of the pipeline, which we implement using the 'not' builtin.
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da7bf5f785
2 changed files with 26 additions and 3 deletions
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@ -769,15 +769,38 @@ ErrorOr<RefPtr<AST::Node>> Parser::parse_and_or()
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ErrorOr<RefPtr<AST::Node>> Parser::parse_pipeline()
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{
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return parse_pipe_sequence();
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while (peek().type == Token::Type::Newline)
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skip();
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auto is_negated = false;
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if (peek().type == Token::Type::Bang) {
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is_negated = true;
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skip();
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}
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return parse_pipe_sequence(is_negated);
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}
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ErrorOr<RefPtr<AST::Node>> Parser::parse_pipe_sequence()
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ErrorOr<RefPtr<AST::Node>> Parser::parse_pipe_sequence(bool is_negated)
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{
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auto node = TRY(parse_command());
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if (!node)
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return RefPtr<AST::Node> {};
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if (is_negated) {
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if (is<AST::CastToCommand>(node.ptr())) {
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node = make_ref_counted<AST::CastToCommand>(
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node->position(),
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make_ref_counted<AST::ListConcatenate>(
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node->position(),
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Vector<NonnullRefPtr<AST::Node>> {
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make_ref_counted<AST::BarewordLiteral>(
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node->position(),
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"not"_short_string),
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*static_cast<AST::CastToCommand&>(*node).inner() }));
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}
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}
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for (;;) {
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if (peek().type != Token::Type::Pipe)
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break;
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