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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/String.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;
char const* separator = " ";
int start_number = 1;
int number_width = 6;
Vector<String> 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](char const* s) {
if (!strcmp(s, "t"))
number_style = NumberNonEmptyLines;
else if (!strcmp(s, "a"))
number_style = NumberAllLines;
else if (!strcmp(s, "n"))
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;
}
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