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d5b66a02c4
I wrote a version of nl for Serenity with a lot but not all of the options in POSIX nl. It includes line count type (-b), increment (-i), delimiter (-s), start number (-v), and width (-w).
115 lines
3.8 KiB
C++
115 lines
3.8 KiB
C++
#include <AK/String.h>
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#include <AK/Vector.h>
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#include <LibCore/CArgsParser.h>
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#include <stdio.h>
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#include <string.h>
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int main(int argc, char** argv)
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{
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CArgsParser args_parser("nl");
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args_parser.add_arg("b", "type", "Line count type. \n\tt counts non-empty lines. \n\ta counts all lines. \n\tn counts no lines.");
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args_parser.add_arg("i", "incr", "Set line count increment.");
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args_parser.add_arg("s", "delim", "Set buffer between the line numbers and text. 1-63 bytes");
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args_parser.add_arg("v", "startnum", "Initial value used to number logical page lines.");
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args_parser.add_arg("w", "width", "The number of characters used for the line number.");
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args_parser.add_single_value("file");
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CArgsParserResult args = args_parser.parse(argc, argv);
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bool all_lines_flag = false;
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bool line_numbers_flag = true;
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String value_of_b;
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if (args.is_present("b")) {
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value_of_b = args.get("b");
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if (value_of_b == "a")
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all_lines_flag = true;
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else if (value_of_b == "t")
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all_lines_flag = false;
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else if (value_of_b == "n")
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line_numbers_flag = false;
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else {
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args_parser.print_usage();
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return 1;
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}
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}
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long line_number_increment = 1;
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String value_of_i;
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if (args.is_present("i")) {
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value_of_i = args.get("i");
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line_number_increment = atol(value_of_i.characters());
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if (!line_number_increment) {
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args_parser.print_usage();
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return 1;
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}
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}
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bool delimiter_flag = false;
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String value_of_s;
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if (args.is_present("s")) {
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value_of_s = args.get("s");
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if (value_of_s.length() > 0 && value_of_s.length() < 64)
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delimiter_flag = true;
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else {
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args_parser.print_usage();
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return 1;
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}
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}
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char delimiter[64];
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strcpy(delimiter, delimiter_flag ? value_of_s.characters() : " ");
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long line_number = 1;
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String value_of_v;
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if (args.is_present("v")) {
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value_of_v = args.get("v");
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line_number = atol(value_of_v.characters());
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}
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String value_of_w;
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unsigned int line_number_width = 6;
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if (args.is_present("w")) {
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value_of_w = args.get("w");
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line_number_width = atol(value_of_w.characters());
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}
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Vector<String> files = args.get_single_values();
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Vector<FILE*> file_pointers;
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if (files.size() > 0) {
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for (auto& file : files) {
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FILE* file_pointer;
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if ((file_pointer = fopen(file.characters(), "r")) == NULL) {
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fprintf(stderr, "unable to open %s\n", file.characters());
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continue;
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}
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file_pointers.append(file_pointer);
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}
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} else {
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file_pointers.append(stdin);
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}
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line_number -= line_number_increment; // so the line number can start at 1 when added below
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for (auto& file_pointer : file_pointers) {
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int previous_character = 0;
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int next_character = 0;
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while ((next_character = fgetc(file_pointer)) != EOF) {
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if (previous_character == 0 || previous_character == '\n') {
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if (!all_lines_flag && next_character == '\n') {
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// skips printing line count on empty lines if all_lines_flags is false
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printf("\n");
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continue;
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}
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if (line_numbers_flag)
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printf("%*lu%s", line_number_width, (line_number += line_number_increment), delimiter);
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else
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printf("%*s", line_number_width, "");
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}
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putchar(next_character);
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previous_character = next_character;
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}
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fclose(file_pointer);
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if (previous_character != '\n')
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printf("\n"); // for cases where files have no trailing newline
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}
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return 0;
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}
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