update.sh

#!/usr/bin/env bash
# Run this script to update the dependencies
set -euo pipefail

# This is the list of dependencies that should be generated using `cabal2nix`.
# The left-hand side is the name of the package, and .nix file that will be
# generated.
# The right-hand side is a `cabal2nix`-compatible URI.
declare -A dependencies=(
  [protolude]=cabal://protolude-0.3.0 # password-instances depends on this
  [generic-lens]=cabal://generic-lens-1.2.0.1
  [servant]=cabal://servant-0.17
  [servant-aeson-specs]=cabal://servant-aeson-specs-0.6.2.0
  [servant-auth]=https://github.com/pwm/servant-auth
  [servant-auth-server]=https://github.com/pwm/servant-auth
  [servant-client]=cabal://servant-client-0.17
  [servant-client-core]=cabal://servant-client-core-0.17
  [servant-docs]=cabal://servant-docs-0.11.5
  [servant-foreign]=cabal://servant-foreign-0.15.1
  [servant-multipart]=cabal://servant-multipart-0.11.5
  [servant-openapi3]=https://github.com/kcsongor/servant-openapi3
  [servant-server]=cabal://servant-server-0.17
  [openapi3]=https://github.com/kcsongor/openapi3
)

# Run in this folder
cd "$(dirname "$0")"

# Update the hackage index
# cabal update

# Remove all of the old files
rm ./*.nix

# Re-generate all of the nix files using cabal2nix
for name in "${!dependencies[@]}"; do
  echo "--- $name ---"
  uri=${dependencies[$name]}

  if [[ $uri =~ ^https://.+$ ]]; then
    # Use nix/sources.json as the canonical pin for github pulls
    sha256=$(jq -r .\""$name"\".sha256 ../sources.json)
    rev=$(jq -r .\""$name"\".rev ../sources.json)
    case "$name" in
      # repos where cabal files are in subdirs
      "servant-auth"|"servant-auth-server")
        cabal2nix --sha256 "$sha256" --revision "$rev" --subpath "$name" "$uri" > "$name.nix"
        ;;
      *) 
        cabal2nix --sha256 "$sha256" --revision "$rev" "$uri" > "$name.nix"
        ;;
    esac
  else
    cabal2nix "$uri" > "$name.nix"
  fi
done

# Generate the index file
{
  echo "lib: prev: {"
  for name in "${!dependencies[@]}"; do
    echo "  $name = lib.doJailbreak (lib.dontCheck (prev.callPackage ./$name.nix {}));"
  done
  echo "}"
} > default.nix