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e2e7c4d574
In a bunch of cases, this actually ends up simplifying the code as
to_number will handle something such as:
```
Optional<I> opt;
if constexpr (IsSigned<I>)
opt = view.to_int<I>();
else
opt = view.to_uint<I>();
```
For us.
The main goal here however is to have a single generic number conversion
API between all of the String classes.
73 lines
2.7 KiB
C++
73 lines
2.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibCore/ArgsParser.h>
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#include <LibCore/DateTime.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <time.h>
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio settime rpath"));
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bool print_unix_date = false;
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bool print_iso_8601 = false;
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bool print_rfc_3339 = false;
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bool print_rfc_5322 = false;
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StringView set_date;
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StringView format_string;
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Core::ArgsParser args_parser;
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args_parser.add_option(set_date, "Set system date and time", "set", 's', "date");
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args_parser.add_option(print_unix_date, "Print date as Unix timestamp", "unix", 'u');
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args_parser.add_option(print_iso_8601, "Print date in ISO 8601 format", "iso-8601", 'i');
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args_parser.add_option(print_rfc_3339, "Print date in RFC 3339 format", "rfc-3339", 'r');
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args_parser.add_option(print_rfc_5322, "Print date in RFC 5322 format", "rfc-5322", 'R');
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args_parser.add_positional_argument(format_string, "Custom format to print the date in", "format-string", Core::ArgsParser::Required::No);
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args_parser.parse(arguments);
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if (!set_date.is_empty()) {
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auto number = set_date.to_number<unsigned>();
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if (!number.has_value()) {
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warnln("date: Invalid timestamp value");
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return 1;
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}
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timespec ts = { number.value(), 0 };
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TRY(Core::System::clock_settime(CLOCK_REALTIME, &ts));
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return 0;
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}
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if (print_unix_date + print_iso_8601 + print_rfc_3339 + print_rfc_5322 + !format_string.is_null() > 1) {
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warnln("date: Multiple output formats specified");
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return 1;
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}
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auto date = Core::DateTime::now();
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if (!format_string.is_null()) {
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// FIXME: If the string argument does not start with a '+' sign, POSIX says
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// we should parse that as a date, and set the system time to it.
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if (format_string.length() == 0 || format_string[0] != '+') {
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warnln("date: Format string must start with '+'");
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return 1;
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}
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outln("{}", date.to_byte_string(format_string.substring_view(1)));
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} else if (print_unix_date) {
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outln("{}", date.timestamp());
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} else if (print_iso_8601) {
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outln("{}", date.to_byte_string("%Y-%m-%dT%H:%M:%S%:z"sv));
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} else if (print_rfc_5322) {
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outln("{}", date.to_byte_string("%a, %d %b %Y %H:%M:%S %z"sv));
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} else if (print_rfc_3339) {
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outln("{}", date.to_byte_string("%Y-%m-%d %H:%M:%S%:z"sv));
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} else {
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outln("{}", date.to_byte_string("%Y-%m-%d %H:%M:%S %Z"sv));
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}
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return 0;
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}
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