carpentry-org / time

A date and time library for Carp

time

A lightweight time library and datatype for Carp.

Installation

(load "[email protected]:carpentry-org/[email protected]")

Usage

This library exports two important datatypes, Datetime and Timedelta. Datetime is meant to be a low friction datatype; this means that it should be relatively easy to create, modify, and convert to other types!

Timedelta is used to add and subtract anything on the scale of seconds to weeks from those times.

(load "[email protected]:carpentry-org/[email protected]")

(defn main []
  (println*
    &(Datetime.strftime
      &(Timedelta.sub &(Datetime.now) &(Timedelta.days 2))
      "%Y-%m-%d %I:%M:%S.%n %p %z")))

You can find the API documentation online!

---

Have fun!

time's Issues

Add proper timedeltas

Instead of trying to continue down the road of adding functions like add-seconds, we should probably use a proper timedelta type instead that we can add and subtract from times.

That would be the more principled abstraction and lead to better userland code.

Cheers

Add strptime

Similarly to strftime, we should support strptime. It requires a fair bit of machinery, but shouldn’t be incredibly hard.

Cheers

and* as well as or* are missing

I am not sure if and* and or* where part of a previous version of carp but they are now missing. Replacing them with and as well as or makes this compile but executing any code leads to a multitude of errors like this one.

String String_prn(const String *s) {
                                ^
out/main.c:14969:21: error: passing 'const char **' to parameter of type 'const String *'
      (aka 'char *const *') discards qualifiers in nested pointer types
      [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
  temp = String_prn(&p->tm_zone);
                    ^~~~~~~~~~~
../carp-v0.5.5-x86_64-linux//core/carp_string.h:119:33: note: passing argument to
      parameter 's' here
String String_prn(const String *s) {