mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-22 23:50:19 +00:00
500044906d
This is not guaranteed to always work correctly as ArgsParser deals in StringViews and might have a non-properly-null-terminated string as a value. As a bonus, using StringView (and DeprecatedString where necessary) leads to nicer looking code too :^)
98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/DeprecatedString.h>
|
|
#include <AK/Vector.h>
|
|
#include <LibCore/ArgsParser.h>
|
|
#include <LibMain/Main.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
enum NumberStyle {
|
|
NumberAllLines,
|
|
NumberNonEmptyLines,
|
|
NumberNoLines,
|
|
};
|
|
|
|
ErrorOr<int> serenity_main(Main::Arguments arguments)
|
|
{
|
|
NumberStyle number_style = NumberNonEmptyLines;
|
|
int increment = 1;
|
|
StringView separator = " "sv;
|
|
int start_number = 1;
|
|
int number_width = 6;
|
|
Vector<DeprecatedString> files;
|
|
|
|
Core::ArgsParser args_parser;
|
|
|
|
Core::ArgsParser::Option number_style_option {
|
|
Core::ArgsParser::OptionArgumentMode::Required,
|
|
"Line numbering style: 't' for non-empty lines, 'a' for all lines, 'n' for no lines",
|
|
"body-numbering",
|
|
'b',
|
|
"style",
|
|
[&number_style](StringView s) {
|
|
if (s == "t"sv)
|
|
number_style = NumberNonEmptyLines;
|
|
else if (s == "a"sv)
|
|
number_style = NumberAllLines;
|
|
else if (s == "n"sv)
|
|
number_style = NumberNoLines;
|
|
else
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
};
|
|
|
|
args_parser.add_option(move(number_style_option));
|
|
args_parser.add_option(increment, "Line count increment", "increment", 'i', "number");
|
|
args_parser.add_option(separator, "Separator between line numbers and lines", "separator", 's', "string");
|
|
args_parser.add_option(start_number, "Initial line number", "startnum", 'v', "number");
|
|
args_parser.add_option(number_width, "Number width", "width", 'w', "number");
|
|
args_parser.add_positional_argument(files, "Files to process", "file", Core::ArgsParser::Required::No);
|
|
args_parser.parse(arguments);
|
|
|
|
Vector<FILE*> file_pointers;
|
|
if (!files.is_empty()) {
|
|
for (auto& file : files) {
|
|
FILE* file_pointer = fopen(file.characters(), "r");
|
|
if (!file_pointer) {
|
|
warnln("Failed to open {}: {}", file, strerror(errno));
|
|
continue;
|
|
}
|
|
file_pointers.append(file_pointer);
|
|
}
|
|
} else {
|
|
file_pointers.append(stdin);
|
|
}
|
|
|
|
for (auto& file_pointer : file_pointers) {
|
|
int line_number = start_number - increment; // so the line number can start at 1 when added below
|
|
int previous_character = 0;
|
|
int next_character = 0;
|
|
while ((next_character = fgetc(file_pointer)) != EOF) {
|
|
if (previous_character == 0 || previous_character == '\n') {
|
|
if (next_character == '\n' && number_style != NumberAllLines) {
|
|
// Skip printing line count on empty lines.
|
|
outln();
|
|
continue;
|
|
}
|
|
if (number_style != NumberNoLines)
|
|
out("{1:{0}}{2}", number_width, (line_number += increment), separator);
|
|
else
|
|
out("{1:{0}}", number_width, "");
|
|
}
|
|
putchar(next_character);
|
|
previous_character = next_character;
|
|
}
|
|
fclose(file_pointer);
|
|
if (previous_character != '\n')
|
|
outln(); // for cases where files have no trailing newline
|
|
}
|
|
return 0;
|
|
}
|