mirror of
https://github.com/SerenityOS/serenity
synced 2024-07-22 02:26:11 +00:00
115 lines
4.3 KiB
C++
115 lines
4.3 KiB
C++
/*
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* Copyright (c) 2020, Matthew L. Curry <matthew.curry@gmail.com>
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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/RefPtr.h>
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#include <AK/StringView.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 <unistd.h>
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static ErrorOr<void> write_line_content(StringView line, size_t count, bool duplicates_only, bool print_count, Core::File& outfile)
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{
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if (duplicates_only && count <= 1)
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return {};
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if (print_count)
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TRY(outfile.write_until_depleted(DeprecatedString::formatted("{} {}\n", count, line).bytes()));
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else
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TRY(outfile.write_until_depleted(DeprecatedString::formatted("{}\n", line).bytes()));
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return {};
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}
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static StringView skip(StringView line, unsigned char_skip_count, unsigned field_skip_count)
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{
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line = line.trim("\n"sv);
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if (field_skip_count) {
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bool in_field = false;
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int field_index = 0;
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unsigned current_field = 0;
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for (size_t i = 0; i < line.length(); i++) {
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char c = line[i];
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if (is_ascii_space(c)) {
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in_field = false;
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field_index = i;
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if (++current_field > field_skip_count)
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break;
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} else if (!in_field) {
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in_field = true;
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}
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}
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line = line.substring_view(field_index);
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}
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char_skip_count = min(char_skip_count, line.length());
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return line.substring_view(char_skip_count);
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}
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio rpath wpath cpath"));
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StringView inpath;
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StringView outpath;
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bool duplicates_only = false;
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bool unique_only = false;
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bool ignore_case = false;
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bool print_count = false;
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unsigned skip_chars = 0;
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unsigned skip_fields = 0;
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Core::ArgsParser args_parser;
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args_parser.add_option(duplicates_only, "Only print duplicated lines", "repeated", 'd');
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args_parser.add_option(unique_only, "Only print unique lines (default)", "unique", 'u');
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args_parser.add_option(ignore_case, "Ignore case when comparing lines", "ignore-case", 'i');
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args_parser.add_option(print_count, "Prefix each line by its number of occurrences", "count", 'c');
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args_parser.add_option(skip_chars, "Skip N chars", "skip-chars", 's', "N");
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args_parser.add_option(skip_fields, "Skip N fields", "skip-fields", 'f', "N");
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args_parser.add_positional_argument(inpath, "Input file", "input", Core::ArgsParser::Required::No);
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args_parser.add_positional_argument(outpath, "Output file", "output", Core::ArgsParser::Required::No);
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args_parser.parse(arguments);
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if (!unique_only && !duplicates_only) {
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unique_only = true;
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} else if (unique_only && duplicates_only) {
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// Printing duplicated and unique lines shouldn't print anything
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return 0;
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}
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auto infile = TRY(Core::InputBufferedFile::create(TRY(Core::File::open_file_or_standard_stream(inpath, Core::File::OpenMode::Read))));
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auto outfile = TRY(Core::File::open_file_or_standard_stream(outpath, Core::File::OpenMode::Write));
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size_t count = 0;
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ByteBuffer previous_buf = TRY(ByteBuffer::create_uninitialized(1024));
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ByteBuffer current_buf = TRY(ByteBuffer::create_uninitialized(1024));
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StringView previous = TRY(infile->read_line(previous_buf));
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StringView previous_to_compare = skip(previous, skip_chars, skip_fields);
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while (TRY(infile->can_read_line())) {
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// FIXME: The buffer does not automatically resize,
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// and this will return EMSGSIZE if the read line
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// is more than 1024 bytes.
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StringView current = TRY(infile->read_line(current_buf));
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StringView current_to_compare = skip(current, skip_chars, skip_fields);
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bool lines_equal = ignore_case ? current_to_compare.equals_ignoring_ascii_case(previous_to_compare) : current_to_compare == previous_to_compare;
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if (!lines_equal) {
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TRY(write_line_content(previous, count, duplicates_only, print_count, *outfile));
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count = 1;
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} else {
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count++;
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}
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swap(current_to_compare, previous_to_compare);
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swap(current_buf, previous_buf);
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swap(current, previous);
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}
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TRY(write_line_content(previous, count, duplicates_only, print_count, *outfile));
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return 0;
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}
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