mirror of
https://github.com/SerenityOS/serenity
synced 2024-07-22 02:26:11 +00:00
139 lines
4 KiB
C++
139 lines
4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, Peter Elliott <pelliott@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/CharacterTypes.h>
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#include <AK/DeprecatedString.h>
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#include <AK/HashMap.h>
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#include <AK/QuickSort.h>
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#include <AK/Vector.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/File.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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struct Line {
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StringView key;
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long int numeric_key;
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DeprecatedString line;
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bool numeric;
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bool operator<(Line const& other) const
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{
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if (numeric)
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return numeric_key < other.numeric_key;
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return key < other.key;
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}
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bool operator==(Line const& other) const
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{
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if (numeric)
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return numeric_key == other.numeric_key;
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return key == other.key;
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}
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private:
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};
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template<>
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struct AK::Traits<Line> : public GenericTraits<Line> {
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static unsigned hash(Line l)
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{
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if (l.numeric)
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return l.numeric_key;
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return l.key.hash();
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}
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};
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struct Options {
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size_t key_field { 0 };
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bool unique { false };
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bool numeric { false };
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bool reverse { false };
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bool zero_terminated { false };
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StringView separator {};
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Vector<DeprecatedString> files;
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};
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static ErrorOr<void> load_file(Options const& options, StringView filename, StringView line_delimiter, Vector<Line>& lines, HashTable<Line>& seen)
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{
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auto file = TRY(Core::InputBufferedFile::create(
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TRY(Core::File::open_file_or_standard_stream(filename, Core::File::OpenMode::Read))));
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// FIXME: Unlimited line length
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auto buffer = TRY(ByteBuffer::create_uninitialized(4096));
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while (TRY(file->can_read_line())) {
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DeprecatedString line { TRY(file->read_until(buffer, line_delimiter)) };
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StringView key = line;
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if (options.key_field != 0) {
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auto split = (!options.separator.is_empty())
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? key.split_view(options.separator)
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: key.split_view_if(is_ascii_space);
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if (options.key_field - 1 >= split.size()) {
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key = ""sv;
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} else {
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key = split[options.key_field - 1];
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}
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}
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Line l = { key, key.to_int().value_or(0), line, options.numeric };
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if (!options.unique || !seen.contains(l)) {
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lines.append(l);
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if (options.unique)
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seen.set(l);
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}
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}
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return {};
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}
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ErrorOr<int> serenity_main([[maybe_unused]] Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio rpath"));
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Options options;
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Core::ArgsParser args_parser;
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args_parser.add_option(options.key_field, "The field to sort by", "key-field", 'k', "keydef");
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args_parser.add_option(options.unique, "Don't emit duplicate lines", "unique", 'u');
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args_parser.add_option(options.numeric, "treat the key field as a number", "numeric", 'n');
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args_parser.add_option(options.separator, "The separator to split fields by", "sep", 't', "char");
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args_parser.add_option(options.reverse, "Sort in reverse order", "reverse", 'r');
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args_parser.add_option(options.zero_terminated, "Use '\\0' as the line delimiter instead of a newline", "zero-terminated", 'z');
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args_parser.add_positional_argument(options.files, "Files to sort", "file", Core::ArgsParser::Required::No);
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args_parser.parse(arguments);
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auto line_delimiter = options.zero_terminated ? "\0"sv : "\n"sv;
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Vector<Line> lines;
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HashTable<Line> seen;
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if (options.files.size() == 0) {
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TRY(load_file(options, "-"sv, line_delimiter, lines, seen));
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} else {
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for (auto& file : options.files) {
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TRY(load_file(options, file, line_delimiter, lines, seen));
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}
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}
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quick_sort(lines);
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auto print_lines = [line_delimiter](auto const& lines) {
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for (auto& line : lines)
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out("{}{}", line.line, line_delimiter);
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};
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if (options.reverse)
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print_lines(lines.in_reverse());
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else
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print_lines(lines);
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return 0;
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}
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