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grep: Add ability to output line numbers

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Ben Wiederhake 2021-11-05 00:35:31 +01:00 • committed by Brian Gianforcaro
parent b9a270e5e7
commit 1d777073fd
Notes: sideshowbarker 2024-07-18 01:27:19 +09:00
2 changed files with 13 additions and 5 deletions
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3
Base/usr/share/man/man1/grep.md
View file

@ -5,7 +5,7 @@ grep
## Synopsis
```sh
$ grep [--recursive] [--extended-regexp] [--regexp Pattern] [-i] [--invert-match] [--quiet] [--no-messages] [--binary-mode ] [--text] [-I] [--color WHEN] [file...]
$ grep [--recursive] [--extended-regexp] [--regexp Pattern] [-i] [--line-numbers] [--invert-match] [--quiet] [--no-messages] [--binary-mode ] [--text] [-I] [--color WHEN] [file...]
```
## Options:
@ -16,6 +16,7 @@ $ grep [--recursive] [--extended-regexp] [--regexp Pattern] [-i] [--invert-match
* `-E`, `--extended-regexp`: Extended regular expressions
* `-e Pattern`, `--regexp Pattern`: Pattern
* `-i`: Make matches case-insensitive
* `-n`, `--line-numbers`: Output line-numbers
* `-v`, `--invert-match`: Select non-matching lines
* `-q`, `--quiet`: Do not write anything to standard output
* `-s`, `--no-messages`: Suppress error messages for nonexistent or unreadable files

15
Userland/Utilities/grep.cpp
View file

@ -46,6 +46,7 @@ int main(int argc, char** argv)
const char* pattern = nullptr;
BinaryFileMode binary_mode { BinaryFileMode::Binary };
bool case_insensitive = false;
bool line_numbers = false;
bool invert_match = false;
bool quiet_mode = false;
bool suppress_errors = false;
@ -56,6 +57,7 @@ int main(int argc, char** argv)
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(line_numbers, "Output line-numbers", "line-numbers", 'n');
args_parser.add_option(invert_match, "Select non-matching lines", "invert-match", 'v');
args_parser.add_option(quiet_mode, "Do not write anything to standard output", "quiet", 'q');
args_parser.add_option(suppress_errors, "Suppress error messages for nonexistent or unreadable files", "no-messages", 's');
@ -129,7 +131,7 @@ int main(int argc, char** argv)
return 1;
}
auto matches = [&](StringView str, StringView filename, bool print_filename, bool is_binary) {
auto matches = [&](StringView str, StringView filename, size_t line_number, bool print_filename, bool is_binary) {
size_t last_printed_char_pos { 0 };
if (is_binary && binary_mode == BinaryFileMode::Skip)
return false;
@ -144,6 +146,8 @@ int main(int argc, char** argv)
} else {
if ((result.matches.size() || invert_match) && print_filename)
out(colored_output ? "\x1B[34m{}:\x1B[0m" : "{}:", filename);
if ((result.matches.size() || invert_match) && line_numbers)
out(colored_output ? "\x1B[35m{}:\x1B[0m" : "{}:", line_number);
for (auto& match : result.matches) {
out(colored_output ? "{}\x1B[32m{}\x1B[0m" : "{}{}",
@ -168,11 +172,11 @@ int main(int argc, char** argv)
return false;
}
while (file->can_read_line()) {
for (size_t line_number = 1; file->can_read_line(); ++line_number) {
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)
if (matches(line, filename, line_number, print_filename, is_binary) && is_binary && binary_mode == BinaryFileMode::Binary)
return true;
}
return true;
@ -197,17 +201,20 @@ int main(int argc, char** argv)
size_t line_len = 0;
ssize_t nread = 0;
ScopeGuard free_line = [line] { free(line); };
size_t line_number = 0;
while ((nread = getline(&line, &line_len, stdin)) != -1) {
VERIFY(nread > 0);
if (line[nread - 1] == '\n')
--nread;
// Human-readable indexes start at 1, so it's fine to increment already.
line_number += 1;
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);
auto matched = matches(line_view, "stdin", line_number, false, is_binary);
did_match_something = did_match_something || matched;
if (matched && is_binary && binary_mode == BinaryFileMode::Binary)
return 0;