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date: Use ArgsParser and add ISO8601 / RFC3339 / RFC5322 output formats

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Brendan Coles 2021-01-07 16:47:16 +00:00 committed by Andreas Kling
parent cf9135557b
commit fb9eb20544
Notes: sideshowbarker 2024-07-19 00:03:24 +09:00 
Author: https://github.com/bcoles
Commit: https://github.com/SerenityOS/serenity/commit/fb9eb205446
Pull-request: https://github.com/SerenityOS/serenity/pull/4841
2 changed files with 77 additions and 9 deletions
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32
Base/usr/share/man/man1/date.md Normal file
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@ -0,0 +1,32 @@
## Name
date - print or set the system date and time
## Synopsis
```**sh
$ date [--set date] [--unix] [--iso-8601] [--rfc-3339] [--rfc-5322]
```
## Description
date is a utility to set the system date and time
or print the system date and time in various formats.
## Options
* `-s`, `--set`: Set system date and time
* `-u`, `--unix`: Print date as Unix timestamp
* `-i`, `--iso-8601`: Print date in ISO 8601 format
* `-r`, `--rfc-3339`: Print date in RFC 3339 format
* `-R`, `--rfc-5322`: Print date in RFC 5322 format
## Examples
```sh
# Print the current date and time in ISO 8601 format
$ date --iso-8601
# Set date to 1610017485 (UNIX time)
$ date -s 1610017485
```

54
Userland/date.cpp
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@ -26,6 +26,7 @@
#include <AK/Optional.h>
#include <AK/String.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/DateTime.h>
#include <stdio.h>
#include <string.h>
@ -38,26 +39,61 @@ int main(int argc, char** argv)
return 1;
}
time_t now = time(nullptr);
bool print_unix_date = false;
bool print_iso_8601 = false;
bool print_rfc_3339 = false;
bool print_rfc_5322 = false;
const char* set_date = nullptr;
Core::ArgsParser args_parser;
args_parser.add_option(set_date, "Set system date and time", "set", 's', "date");
args_parser.add_option(print_unix_date, "Print date as Unix timestamp", "unix", 'u');
args_parser.add_option(print_iso_8601, "Print date in ISO 8601 format", "iso-8601", 'i');
args_parser.add_option(print_rfc_3339, "Print date in RFC 3339 format", "rfc-3339", 'r');
args_parser.add_option(print_rfc_5322, "Print date in RFC 5322 format", "rfc-5322", 'R');
args_parser.parse(argc, argv);
if (set_date != nullptr) {
auto number = String(set_date).to_uint();
if (argc == 2 && !strcmp(argv[1], "-u")) {
printf("%lld\n", now);
return 0;
}
if (argc == 3 && !strcmp(argv[1], "-s")) {
auto number = StringView(argv[2]).to_uint();
if (!number.has_value()) {
fprintf(stderr, "date: Invalid timestamp value");
return 1;
}
timespec ts = { number.value(), 0 };
if (clock_settime(CLOCK_REALTIME, &ts) < 0) {
perror("clock_settime");
return 1;
}
return 0;
}
printf("%s\n", Core::DateTime::from_timestamp(now).to_string().characters());
return 0;
// FIXME: this should be improved and will need to be cleaned up
// when additional output formats and formatting is supported
if (print_unix_date && print_iso_8601 && print_rfc_3339 && print_rfc_5322) {
fprintf(stderr, "date: multiple output formats specified\n");
return 1;
}
time_t now = time(nullptr);
auto date = Core::DateTime::from_timestamp(now);
if (print_unix_date) {
printf("%lld\n", (long long)now);
return 0;
} else if (print_iso_8601) {
printf("%s\n", date.to_string("%Y-%m-%dT%H:%M:%S-00:00").characters());
return 0;
} else if (print_rfc_5322) {
printf("%s\n", date.to_string("%a, %d %b %Y %H:%M:%S -0000").characters());
return 0;
} else if (print_rfc_3339) {
printf("%s\n", date.to_string("%Y-%m-%d %H:%M:%S-00:00").characters());
return 0;
} else {
printf("%s\n", date.to_string().characters());
return 0;
}
}