Minecraft Mappings Fetcher Script

fetch-mapping.sh

#!/usr/bin/env bash

VERSION_MANIFEST_FILE="/mnt/c/Users/fbcpck/AppData/Roaming/.minecraft/versions/version_manifest_v2.json"

# Prints usage help text
function usage {
  echo "Usage: fetch-mapping.sh <version> [version-manifest-path]"
  echo "  <version>: Fetch server mappings of a specific version e.g. 21w41a"
  echo "             Use --latest-release to fetch latest release version"
  echo "             Use --latest-snapshot to fetch latest snapshot version"
  echo
  echo " [version-manifest-path]: Path to manifest version file. Defaults to the following value:"
  echo " $VERSION_MANIFEST_FILE"
}

# Not enough args
if [[ "$1" == "" ]]; then
  echo "fetch-mapping.sh – Script to fetch Minecraft mapping files"
  echo
  usage
  exit
fi

# Too many args
if [[ "$3" != "" ]]; then
  echo "Too many arguments!"
  echo
  usage
  exit
fi

# Print version manifest location
if [[ "$2" != "" ]]; then
  VERSION_MANIFEST_FILE="$2"
fi
echo "Version manifest location: $VERSION_MANIFEST_FILE"

# Resolve version
VERSION="$1"
if [[ "$1" == "--latest-release" ]]; then
  VERSION="$(cat "$VERSION_MANIFEST_FILE" | jq -r ".latest.release")"
elif [[ "$1" == "--latest-snapshot" ]]; then
  VERSION="$(cat "$VERSION_MANIFEST_FILE" | jq -r ".latest.snapshot")"
fi
echo "Version: $VERSION"

printf "$PRINTF_FORMAT" "ASSET_MANIFEST_URL... "
ASSET_MANIFEST_URL="$(cat "$VERSION_MANIFEST_FILE" | jq -r ".versions | map(select(.id==\"$VERSION\")) | .[0].url ")"
printf "$ASSET_MANIFEST_URL\n"

printf "$PRINTF_FORMAT" "SERVER_MAPPINGS_URL... "
ASSET_MANIFEST="$(curl -fsSL "$ASSET_MANIFEST_URL")"
SERVER_MAPPINGS_URL="$(echo $ASSET_MANIFEST | jq -r ".downloads.server_mappings.url")"
printf "$SERVER_MAPPINGS_URL\n"

printf "$PRINTF_FORMAT" "Saving to $VERSION.txt... "
curl -fsSL "$SERVER_MAPPINGS_URL" -o "$VERSION.txt"
echo "Done"