migrate-nuget.sh

#! /usr/bin/env bash

set -euo pipefail

grep -oRIP --exclude='*.md' '(?<=nugetDeps = (?:import )?)(\.\.?/[\w\-_\/]+\.nix)' . | while read -r LINE; do
    echo "Line: $LINE"

    IFS=':' read -ra PARTS <<<"$LINE"

    echo "${LINE[@]}"

    DRV_FILE_PATH="${PARTS[0]}"
    NIX_DEPS_FILE_NAME="${PARTS[1]}"
    NIX_DEPS_FILE_PATH="$(realpath "$(dirname "$DRV_FILE_PATH")/${PARTS[1]}")"
    JSON_DEPS_FILE_NAME="${NIX_DEPS_FILE_NAME%.nix}.json"
    JSON_DEPS_FILE_PATH="${NIX_DEPS_FILE_PATH%.nix}.json"

    # Convert file if it hasn't been already.
    if [ ! -e "$JSON_DEPS_FILE_PATH" ]; then
        if ! [ -e "$NIX_DEPS_FILE_PATH" ]; then
            echo "Nix-based dependency file $NIX_DEPS_FILE_PATH does not exist and converted version was not found at $JSON_DEPS_FILE_PATH!"
            exit 1
        fi

        echo "Migrating $NIX_DEPS_FILE_PATH to $JSON_DEPS_FILE_PATH.json..."
        nix eval --json --file "$NIX_DEPS_FILE_PATH" --apply 'f: f { fetchNuGet = id: id; }' | jq 'map({pname, version, sha256, hash, md5, url}|with_entries(select(.value != null)))' >"$JSON_DEPS_FILE_PATH"
        rm "$NIX_DEPS_FILE_PATH"
    fi

    echo "Updating file name in $DRV_FILE_PATH to rename $NIX_DEPS_FILE_NAME to $JSON_DEPS_FILE_NAME..."
    if IFS='' read -r -d '' DRV_FILE_CONTENT <"$DRV_FILE_PATH"; then
        echo "$DRV_FILE_PATH: null bytes found." >&2
        exit 1
    fi
    DRV_FILE_CONTENT="${DRV_FILE_CONTENT//import "$NIX_DEPS_FILE_NAME"/"$JSON_DEPS_FILE_NAME"}"
    printf '%s' "${DRV_FILE_CONTENT//"$NIX_DEPS_FILE_NAME"/"$JSON_DEPS_FILE_NAME"}" >"$DRV_FILE_PATH"
done