Paper/scripts/decompile.sh

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#!/usr/bin/env bash
(
set -e
PS1="$"
basedir="$(cd "$1" && pwd -P)"
workdir="$basedir/work"
minecraftversion=$(cat "$workdir/BuildData/info.json" | grep minecraftVersion | cut -d '"' -f 4)
windows="$([[ "$OSTYPE" == "cygwin" || "$OSTYPE" == "msys" ]] && echo "true" || echo "false")"
decompiledir="$workdir/Minecraft/$minecraftversion"
spigotdecompiledir="$decompiledir/spigot"
forgedecompiledir="$decompiledir/forge"
forgeflowerversion="1.5.380.19"
forgeflowerurl="http://files.minecraftforge.net/maven/net/minecraftforge/forgeflower/$forgeflowerversion/forgeflower-$forgeflowerversion.jar"
# temp use patched version
forgeflowerurl="https://zachbr.keybase.pub/paper/forgeflower-patched/forgeflower-1.5.380.19.jar?dl=1"
forgeflowerbin="$workdir/ForgeFlower/$forgeflowerversion.jar"
# TODO: Make this better? We don't need spigot compat for this stage
forgefloweroptions="-dgs=1 -hdc=0 -asc=1 -udv=1 -jvn=1"
forgeflowercachefile="$decompiledir/forgeflowercache"
forgeflowercachevalue="$forgeflowerurl - $forgeflowerversion - $forgefloweroptions";
classdir="$decompiledir/classes"
versionjson="$workdir/Minecraft/$minecraftversion/$minecraftversion.json"
if [ ! -f "$versionjson" ]; then
echo "Downloading $minecraftversion JSON Data"
verescaped=$(echo ${minecraftversion} | sed 's/\./\\./g')
jsonurl=$(curl -s "https://launchermeta.mojang.com/mc/game/version_manifest.json" | grep -oE "https://.*?${verescaped}.json")
curl -o "$versionjson" "$jsonurl"
echo "$versionjson - $jsonurl"
fi
function downloadLibraries {
group=$1
groupesc=$(echo ${group} | sed 's/\./\\./g')
grouppath=$(echo ${group} | sed 's/\./\//g')
libdir="$decompiledir/libraries/${group}/"
mkdir -p "$libdir"
shift
for lib in "$@"
do
jar="$libdir/${lib}-sources.jar"
destlib="$libdir/${lib}"
if [ ! -f "$jar" ]; then
libesc=$(echo ${lib} | sed 's/\./\\]./g')
ver=$(grep -oE "${groupesc}:${libesc}:[0-9\.]+" "$versionjson" | sed "s/${groupesc}:${libesc}://g")
echo "Downloading ${group}:${lib}:${ver} Sources"
curl -s -o "$jar" "https://libraries.minecraft.net/${grouppath}/${lib}/${ver}/${lib}-${ver}-sources.jar"
set +e
grep "<html>" "$jar" && grep -oE "<title>.*?</title>" "$jar" && rm "$jar" && echo "Failed to download $jar" && exit 1
set -e
fi
if [ ! -d "$destlib/$grouppath" ]; then
echo "Extracting $group:$lib Sources"
mkdir -p "$destlib"
(cd "$destlib" && jar xf "$jar")
fi
done
}
downloadLibraries "com.mojang" datafixerupper authlib brigadier
# prep folders
mkdir -p "$workdir/ForgeFlower"
mkdir -p "$spigotdecompiledir"
mkdir -p "$forgedecompiledir"
echo "Extracting NMS classes..."
if [ ! -d "$classdir" ]; then
mkdir -p "$classdir"
cd "$classdir"
set +e
jar xf "$decompiledir/$minecraftversion-mapped.jar" net/minecraft/server
if [ "$?" != "0" ]; then
cd "$basedir"
echo "Failed to extract NMS classes."
exit 1
fi
set -e
fi
needsDecomp=0
if [ ! -f "$forgeflowercachefile" ]; then
needsDecomp=1
elif [ "$(cat ${forgeflowercachefile})" != "$forgeflowercachevalue" ]; then
needsDecomp=1
fi
if [ "$needsDecomp" == "1" ]; then
# our local cache is now invalidated, we can update forgeflower to get better deobfuscation
rm -rf "$forgedecompiledir/net"
fi
# Forge (for Paper mc-dev imports, and dev src folders for unimported files)
if [ ! -d "$forgedecompiledir/net" ] ; then
echo "Decompiling classes (stage 1)..."
cd "$basedir"
if [ ! -f "$forgeflowerbin" ]; then
echo "Downloading ForgeFlower ($forgeflowerversion)..."
curl -s -o "$forgeflowerbin" "$forgeflowerurl"
fi
set +e
java -Ddecomp.renameparams=true -jar "$forgeflowerbin" ${forgefloweroptions} -ind=' ' "$classdir" "$forgedecompiledir"
if [ "$?" != "0" ]; then
rm -rf "$forgedecompiledir/net"
echo "Failed to decompile classes."
exit 1
fi
echo "$forgeflowercachevalue" > "$forgeflowercachefile"
set -e
fi
# Spigot (for CraftBukkit patches)
# if we see the old net folder, copy it to spigot to avoid redecompiling
if [ -d "$decompiledir/net" ]; then
cp -r "$decompiledir/net" "$spigotdecompiledir/"
fi
if [ ! -d "$spigotdecompiledir/net" ]; then
echo "Decompiling classes (stage 2)..."
cd "$basedir"
set +e
java -jar "$workdir/BuildData/bin/fernflower.jar" -dgs=1 -hdc=0 -asc=1 -udv=0 "$classdir" "$spigotdecompiledir"
if [ "$?" != "0" ]; then
rm -rf "$spigotdecompiledir/net"
echo "Failed to decompile classes."
exit 1
fi
set -e
fi
# set a symlink to current
currentlink="$workdir/Minecraft/current"
if ([ ! -e "$currentlink" ] || [ -L "$currentlink" ]) && [ "$windows" == "false" ]; then
set +e
echo "Pointing $currentlink to $minecraftversion"
rm -rf "$currentlink" || true
ln -sfn "$minecraftversion" "$currentlink" || echo "Failed to set current symlink"
fi
)