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Hamish Mackenzie
61dea04edb
We have been using `readFile` and `fromJSON` to read a `.json` a 60MB .json file. This change puts the information contained in the json file into `.nix` files that are imported when needed (rather than all at once). This seems to save around 1s at eval time.
Tested with:
```
time nix-instantiate -E '(import ./. {}).pkgs-unstable.haskell-nix.tool "ghc8107" "hello" {}'
time nix-instantiate -E '(import ./. {}).pkgs-unstable.haskell-nix.tool "ghc8107" "haskell-language-server" {}'
```
See also https://github.com/input-output-hk/nix-tools/pull/118