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date: Allow using a custom format string

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This commit adds an optional string positional argument which is used a
custom format string for the date.
This commit is contained in:
Daniel Bertalan 2022-02-25 21:40:28 +01:00 committed by Linus Groh
parent 01dc718f07
commit 7bd68c86d3
2 changed files with 21 additions and 6 deletions
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9
Base/usr/share/man/man1/date.md
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@ -5,7 +5,7 @@ date - print or set the system date and time
## Synopsis
```**sh
$ date [--set date] [--unix] [--iso-8601] [--rfc-3339] [--rfc-5322]
$ date [--set date] [--unix] [--iso-8601] [--rfc-3339] [--rfc-5322] [format-string]
```
## Description
@ -21,12 +21,19 @@ or print the system date and time in various formats.
* `-r`, `--rfc-3339`: Print date in RFC 3339 format
* `-R`, `--rfc-5322`: Print date in RFC 5322 format
## Arguments
* `format-string`: Custom format to print the date in. Must start with a '+' character.
## Examples
```sh
# Print the current date and time in ISO 8601 format
$ date --iso-8601
# Print the current date in a custom format
$ date +%Y-%m-%d
# Set date to 1610017485 (UNIX time)
$ date -s 1610017485
```

18
Userland/Utilities/date.cpp
View file

@ -20,6 +20,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
bool print_rfc_3339 = false;
bool print_rfc_5322 = false;
const char* set_date = nullptr;
StringView format_string;
Core::ArgsParser args_parser;
args_parser.add_option(set_date, "Set system date and time", "set", 's', "date");
@ -27,6 +28,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
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.add_positional_argument(format_string, "Custom format to print the date in", "format-string", Core::ArgsParser::Required::No);
args_parser.parse(arguments);
if (set_date != nullptr) {
@ -43,15 +45,21 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
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) {
warnln("date: multiple output formats specified");
if (print_unix_date + print_iso_8601 + print_rfc_3339 + print_rfc_5322 + !format_string.is_null() > 1) {
warnln("date: Multiple output formats specified");
return 1;
}
auto date = Core::DateTime::now();
if (print_unix_date) {
if (!format_string.is_null()) {
// FIXME: If the string argument does not start with a '+' sign, POSIX says
// we should parse that as a date, and set the system time to it.
if (format_string.length() == 0 || format_string[0] != '+') {
warnln("date: Format string must start with '+'");
return 1;
}
outln("{}", date.to_string(format_string.substring_view(1)));
} else if (print_unix_date) {
outln("{}", date.timestamp());
} else if (print_iso_8601) {
outln("{}", date.to_string("%Y-%m-%dT%H:%M:%S%:z"));