#!/usr/bin/env nix-shell
#! nix-shell -i bash -p bundix yarn2nix yarn nix-prefetch-git jq
set -e

URL=https://github.com/glitch-soc/mastodon.git
REVISION=$(jq -r '.nodes.mastodon.locked.rev' ../flake.lock)

rm -f gemset.nix yarn.nix
TARGET_DIR="$PWD"


WORK_DIR=$(mktemp -d)

# Check that working directory was created.
if [[ ! "$WORK_DIR" || ! -d "$WORK_DIR" ]]; then
    echo "Could not create temporary directory"
    exit 1
fi

# Delete the working directory on exit.
function cleanup {
    # Report errors, if any, from nix-prefetch-git
    grep "fatal" $WORK_DIR/nix-prefetch-git.out >/dev/stderr || true
    rm -rf "$WORK_DIR"
}
trap cleanup EXIT

echo "Fetching source code $REVISION from $URL"
JSON=$(nix-prefetch-git --url "$URL" --rev "$REVISION"  2> $WORK_DIR/nix-prefetch-git.out)
SHA=$(echo $JSON | jq -r .sha256)
FETCHED_SOURCE_DIR=$(grep '^path is' $WORK_DIR/nix-prefetch-git.out | sed 's/^path is //')

cat > source.nix << EOF
# This file was generated by pkgs.mastodon.updateScript.
{ fetchgit, applyPatches }: let
  src = fetchgit {
    url = "$URL";
    rev = "$REVISION";
    sha256 = "$SHA";
  };
in applyPatches {
  inherit src;
  patches = [$PATCHES];
}
EOF
SOURCE_DIR="$(nix-build --no-out-link -E '(import <nixpkgs> {}).callPackage ./source.nix {}')"
rm source.nix

echo "Creating gemset.nix"
bundix --lockfile="$SOURCE_DIR/Gemfile.lock" --gemfile="$SOURCE_DIR/Gemfile"
echo "" >> $TARGET_DIR/gemset.nix  # Create trailing newline to please EditorConfig checks

echo "Creating yarn.nix"
yarn2nix --lockfile="$SOURCE_DIR/yarn.lock" > $TARGET_DIR/yarn.nix