# Changelog for swiss-ephemeris

## v1.3.0.2

* More memory safety paranoia: ensure that `gravGroup` functions have appropriately
  scoped "extraData" pointers; was using an unsafe function before that somewhat inexplicably never failed, except for one time _maybe_ while doing unrelated testing.
* Fix empty sector handling for `gravGroup`: it now correctly reports that zero-length
  sectors are not supported.

## v1.3.0.1 
 
A couple of memory safety patches:

* Attempt to rein in memory unsafety by keeping all pointer peeking in IO for gravGroup fns.
* Always allocate 256 chars for error messages. 
* [dev] Bundle test ephemeris into the hackage tarball, to allow hackage CI and nixOS to
  successfully run tests.

## v1.3.0.0 (2021-06-18)

* **Drops support for base < 4.10**, which effectively excludes GHC versions less
  than or equal to 8.0.2. Supporting older haskells gets more cumbersome with each
  addition. Please submit a patch with all the preprocessor magic if you _really_
  want old haskell support.
* Add `ChartUtils` namespace, with a couple of convenience functions for chart drawing.
* Upgrade to swiss ephemeris 2.10.01.
* **Update LICENSE to AGPL** -- it changed in the C library, too.
* [dev] Fix QuickCheck test dependency, to hopefully be copacetic in NixOS builds.
* [dev] add optional `nix` scripts.
* [dev] a whole buncha hlint + autoformat fixes.

## v1.2.1.1 (2021-03-14)

* Bump upper bound for `base`, to work with newer haskells.

## v1.2.1.0 (2020-11-14)

* Introduces `gregorianDateTime`, which is the reverse of `julianDay`: given a JD, return
  a tuple with `(year, month, day, decimalHour)`.

## v1.2.0.0 (2020-09-14)

**BREAKING CHANGE:** `splitDegrees` now takes options that reflect the options in the underlying library.

* Constructors for `JulianTime` and `SiderealTime` are now exposed.
* Introduce `SplitDegreesOption` enum for all options one can split degrees with; amends `splitDegrees` to take
  said options as the first argument.
* `splitDegreesZodiac` is unchanged, though a mere veneer for the now more powerful `splitDegrees`.
* Since `splitDegreesZodiac` goes the extra enum-mile to provide human-readable zodiac names, and the underlying
  library can also split on Nakshatras, we now include the `NakshatraName` enum. Names are from wikipedia
  and I saw some variants, so please forgive any mispellings!

## v1.1.0.0 (2020-09-12)

**BREAKING CHANGE:** the `Coordinates` type has been retired, in favor of the more specific
`GeographicPosition` and `EclipticPosition`. `calculateCoordinates` is now `calculateEclipticPosition`,
and the `calculateCusps*` family now takes a `GeographicPosition` as part of its inputs.

* Introduces an `Internal` module with types and helpers that this library introduces,
  which are not native to the underlying C library. Import at your own risk! (the "curated"/
  "stable" ones are re-exported by the main module.)
  - Deprecates the `Coordinates` type, in favor of `EclipticPosition`.
* Introduces functions to `calculateEquatorialPosition` and `calculateObliquity` at a given time,
  as well as types that better convey the different types of positions (`EquatorialPosition`, `ObliquityInformation`).
* Some astrology helpers: convert between equatorial and ecliptic (and vice-versa,)
  obtain the Delta Time effective at a given moment, obtain the house position of a given body.
  (**Note:** the `calculateHousePosition` function is more useful for working near the polar circles or for bodies
  off of the ecliptic -- the ARMC and obliquity need to be calculated or provided, it's simpler
  if you already have the cusps: just check which cusps a given longitude falls between -- no need for
  this function!)


## v1.0.0.0 (2020-09-07)

* Refactor the `calculateCusps` function:
  - Return a simple list of cusps. This allows for future implementations of exotic systems
    that have more (or fewer?) cusps, and hews closer to regular usage (which iterates over the cusps.)
  - The house system comes first, to allow for more ergonomic partial application for uses where one system is
    the "default" (e.g. `traditionalCusps = calculateCusps Placidus`.)
* Cleans up haddocks, adds many links to the original docs (and notes the headings, since updates to those
  seem to break hyperlinking?)

## v0.3.1.0

* Fixes occasional segmentation fault (caught most often in the more memory-strapped CI server than in my computer,)
  caused by using [`alloca`](https://hackage.haskell.org/package/base-4.14.0.0/docs/Foreign-Marshal-Alloc.html#v:alloca) for the error string and, when no error string was populated, ending with undefined
  behavior. Now we explicitly allocate the 256 `char`s that the documentation and C sources recommend, which seems to be always
  freed by Haskell, vs. leaving a hole somewhere when the underlying library fails to terminate the string.

## v0.3.0.0

**Breaking fixes to `calculateCusps` and `calculateCoordinates`**

* Upgrades to v2.09.03 of the C library, to incorporate some bug fixes that seem marginally related
  to random breakage I've seen; read more at: https://www.astro.com/swisseph/swephprg.htm#_Toc49847971
* Introduces `withoutEphemerides` which sets the ephe path to `NULL` (via the also new `setNoEphemeridesPath`)
  and takes care of calling `closeEphemerides`. Use this or `withEphemerides` for memory safety,
  only call the functions directly if you _really_ know what you're doing (i.e setting/closing ephemerides
  in some other manner.)
* Both calculation functions are now `IO` computations, to reflect the fact that they may interact
  with ephemeris data and allocate memory that `closeEphemerides` _has_ to free.
* More closely reflects the underlying behavior for calculating cusps: it _may_ return
  cusps in the `Porphyrius` system if given a point for which the chosen system fails. To
  more explicitly reflect this, we now have `calculateCuspsStrict` which returns a `Left` value
  if the requested house system couldn't be used. `calculateCuspsLenient`  always returns a calculation,
  and is aliased to `calculateCusps` as the "default" method.
* Since the calculation may have changed the house system, we now return a `systemUsed` entry
  in the `CuspsCalculation` record.


## v0.2.0.0

* Introduces `withEphemerides` for bracketed access to the ephemeris directory.
* Changes the signature of `calculateCusps` to return a `Left` value if the underlying library
  is unable to calculate the cusps.
* Introduces "monadic" versions of the calculations that work with instances of `MonadFail`:
  `calculateCuspsM` and `calculateCoordinatesM`
* Improves test coverage with property testing.

## v0.1.0.0 - 0.1.0.2(2020-08-12)

* Bundles the C code for v2.09.01 of [Swiss
  Ephemerides](https://www.astro.com/swisseph/swephinfo_e.htm) -- refer to that
  page and related documentation for other possible additions to this package! 
* First release with basic bindings to calculate the coordinates of bodies
  between the Sun and Chiron, plus cusps and major angles --
`calculateCoordinates` and `calculateCusps`, respectively.
* The functions `setEphemeridesPath` and `closeEphemerides` are provided to
  initialize (important) and release (less important) resources related to
  caching calculations and locating the data files for ephemerides.