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Author SHA1 Message Date
Akshay Mankar f30dbd05fe
buildDhallDirectoryPackage: Stringify src for documentationRoot (#162401)
The `src` is supposed to be a path, but when `documentationRoot` is provided
with a path, it errors with:

generators.mkValueStringDefault: this value is not supported: "<nix-store-path>"

Making it a string fixes this error.
2022-03-01 15:34:21 -08:00
Gabriel Gonzalez 6dac8e6817 Add buildDhall*Package support for generating documentation
The `buildDhall{Directory,GitHub}Package` utilities now take an
optional `document` argument for generating documentation using
`dhall-docs`.  The documentation is stored underneath the `./docs`
subdirectory of the build product.
2020-12-01 15:30:52 +01:00
Gabriel Gonzalez 87d5e6fc1a Change idiom for overriding Dhall package version
Before this change, a Dhall package like the Prelude would be
encoded as a record with one field per supported version.  Then
downstream packages would specify which package to override
by selecting a different record field.

The problem with that approach is that it did not provide an
easy way to override a package to a version other than the default
ones supplied by Nixpkgs.  Normally you would use the `.override`
method for this purpose, but the `override` method added by
`buildDhall{Directory,GitHub}Package` is clobbered by the
`override` method added by `callPackage` in
`./pkgs/top-level/dhall-packages.nix`.

The solution is to add a separate `.overridePackage` method which is
essentially the exact same as `.override`, except that it is no
longer clobbered by `callPackage`.  This `.overridePackage` method
allows one to override the arguments supplied to
`buildDhall{Directory,GitHub}Package`, making it easier to specify
package versions outside of the ones supported by Nixpkgs..

This also includes a change to only build one (preferred) version of each
package (instead of multiple supported versions per package), in order to
minimize the maintenance burden for the Dhall package set.
2020-11-11 11:16:04 +01:00
Gabriel Gonzalez 459cf94991 Nixpkgs support for dhall-to-nixpkgs
The motivation for this change is to enable a new Dhall command-line
utility called `dhall-to-nixpkgs` which converts Dhall packages to
buildable Nix packages.  You can think of `dhall-to-nixpkgs` as the
Dhall analog of `cabal2nix`.

You can find the matching pull request for `dhall-to-nixpkgs` here:

https://github.com/dhall-lang/dhall-haskell/pull/1826

The two main changes required to support `dhall-to-nixpkgs` are:

* Two new `buildDhall{Directory,GitHub}Package` utilities are added

  `dhall-to-nixpkgs` uses these in the generated output

* `pkgs.dhallPackages` now selects a default version for each package
  using the `prefer` utility

  All other versions are still buildable via a `passthru` attribute
2020-06-17 15:57:21 +02:00