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/*
* Copyright (c) 2020, Emanuel Sprung <emanuel.sprung@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Assertions.h>
#include <AK/ByteBuffer.h>
#include <AK/ScopeGuard.h>
#include <AK/String.h>
#include <AK/Utf8View.h>
#include <AK/Vector.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/DirIterator.h>
#include <LibCore/File.h>
#include <LibRegex/Regex.h>
#include <stdio.h>
#include <unistd.h>
enum class BinaryFileMode {
Binary,
Text,
Skip,
};
template<typename... Ts>
void fail(StringView format, Ts... args)
{
warn("\x1b[31m");
warnln(format, forward<Ts>(args)...);
warn("\x1b[0m");
abort();
}
int main(int argc, char** argv)
{
if (pledge("stdio rpath", nullptr) < 0) {
perror("pledge");
return 1;
}
Vector<const char*> files;
bool recursive { false };
bool use_ere { false };
const char* pattern = nullptr;
BinaryFileMode binary_mode { BinaryFileMode::Binary };
bool case_insensitive = false;
bool invert_match = false;
Core::ArgsParser args_parser;
args_parser.add_option(recursive, "Recursively scan files starting in working directory", "recursive", 'r');
args_parser.add_option(use_ere, "Extended regular expressions", "extended-regexp", 'E');
args_parser.add_option(pattern, "Pattern", "regexp", 'e', "Pattern");
args_parser.add_option(case_insensitive, "Make matches case-insensitive", nullptr, 'i');
args_parser.add_option(invert_match, "Select non-matching lines", "invert-match", 'v');
args_parser.add_option(Core::ArgsParser::Option {
.requires_argument = true,
.help_string = "Action to take for binary files ([binary], text, skip)",
.long_name = "binary-mode",
.accept_value = [&](auto* str) {
if ("text"sv == str)
binary_mode = BinaryFileMode::Text;
else if ("binary"sv == str)
binary_mode = BinaryFileMode::Binary;
else if ("skip"sv == str)
binary_mode = BinaryFileMode::Skip;
else
return false;
return true;
},
});
args_parser.add_option(Core::ArgsParser::Option {
.requires_argument = false,
.help_string = "Treat binary files as text (same as --binary-mode text)",
.long_name = "text",
.short_name = 'a',
.accept_value = [&](auto) {
binary_mode = BinaryFileMode::Text;
return true;
},
});
args_parser.add_option(Core::ArgsParser::Option {
.requires_argument = false,
.help_string = "Ignore binary files (same as --binary-mode skip)",
.long_name = nullptr,
.short_name = 'I',
.accept_value = [&](auto) {
binary_mode = BinaryFileMode::Skip;
return true;
},
});
args_parser.add_positional_argument(files, "File(s) to process", "file", Core::ArgsParser::Required::No);
args_parser.parse(argc, argv);
// mock grep behaviour: if -e is omitted, use first positional argument as pattern
if (pattern == nullptr && files.size())
pattern = files.take_first();
PosixOptions options {};
if (case_insensitive)
options |= PosixFlags::Insensitive;
auto grep_logic = [&](auto&& re) {
if (re.parser_result.error != Error::NoError) {
return 1;
}
auto matches = [&](StringView str, StringView filename = "", bool print_filename = false, bool is_binary = false) {
size_t last_printed_char_pos { 0 };
if (is_binary && binary_mode == BinaryFileMode::Skip)
return false;
auto result = re.match(str, PosixFlags::Global);
if (result.success ^ invert_match) {
if (is_binary && binary_mode == BinaryFileMode::Binary) {
outln("binary file \x1B[34m{}\x1B[0m matches", filename);
} else {
if ((result.matches.size() || invert_match) && print_filename) {
out("\x1B[34m{}:\x1B[0m", filename);
}
for (auto& match : result.matches) {
out("{}\x1B[32m{}\x1B[0m",
StringView(&str[last_printed_char_pos], match.global_offset - last_printed_char_pos),
match.view.to_string());
last_printed_char_pos = match.global_offset + match.view.length();
}
outln("{}", StringView(&str[last_printed_char_pos], str.length() - last_printed_char_pos));
}
return true;
}
return false;
};
auto handle_file = [&matches, binary_mode](StringView filename, bool print_filename) -> bool {
auto file = Core::File::construct(filename);
if (!file->open(Core::OpenMode::ReadOnly)) {
warnln("Failed to open {}: {}", filename, file->error_string());
return false;
}
while (file->can_read_line()) {
auto line = file->read_line();
auto is_binary = memchr(line.characters(), 0, line.length()) != nullptr;
if (matches(line, filename, print_filename, is_binary) && is_binary && binary_mode == BinaryFileMode::Binary)
return true;
}
return true;
};
auto add_directory = [&handle_file](String base, Optional<String> recursive, auto handle_directory) -> void {
Core::DirIterator it(recursive.value_or(base), Core::DirIterator::Flags::SkipDots);
while (it.has_next()) {
auto path = it.next_full_path();
if (!Core::File::is_directory(path)) {
auto key = path.substring_view(base.length() + 1, path.length() - base.length() - 1);
handle_file(key, true);
} else {
handle_directory(base, path, handle_directory);
}
}
};
bool did_match_something = false;
if (!files.size() && !recursive) {
char* line = nullptr;
size_t line_len = 0;
ssize_t nread = 0;
ScopeGuard free_line = [line] { free(line); };
while ((nread = getline(&line, &line_len, stdin)) != -1) {
VERIFY(nread > 0);
if (line[nread - 1] == '\n')
--nread;
StringView line_view(line, nread);
bool is_binary = line_view.contains(0);
if (is_binary && binary_mode == BinaryFileMode::Skip)
return 1;
auto matched = matches(line_view, "stdin", false, is_binary);
did_match_something = did_match_something || matched;
if (matched && is_binary && binary_mode == BinaryFileMode::Binary)
return 0;
}
} else {
if (recursive) {
add_directory(".", {}, add_directory);
} else {
bool print_filename { files.size() > 1 };
for (auto& filename : files) {
if (!handle_file(filename, print_filename))
return 1;
}
}
}
return did_match_something ? 0 : 1;
};
if (use_ere)
return grep_logic(Regex<PosixExtended>(pattern, options));
return grep_logic(Regex<PosixBasic>(pattern, options));
}
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