createPatches.sh

#!/bin/bash
# Script heavily based on CraftBukkit's makePatches.sh:
# https://hub.spigotmc.org/stash/projects/SPIGOT/repos/craftbukkit/browse/makePatches.sh

if [ -z "$1" ]
then
    echo "Missing clean decompiled sources argument. The clean directory should have been generated by setupWorkspace.sh under 'decompile'"
    exit
fi

# https://stackoverflow.com/a/38595160
# https://stackoverflow.com/a/800644
if sed --version >/dev/null 2>&1; then
    strip_cr() {
        sed -i -- "s/\r//" "$@"
    }
else
    strip_cr () {
        sed -i "" "s/$(printf '\r')//" "$@"
    }
fi

clean="$1"
modded="src/main/java"

for file in $modded/**/*
do
    # Ignore any of the modded project's source files
    if [ $file = "src/main/java/wtf/*" ] || [ -d "$file" ]
    then
        continue
    fi

    relativeFileName=${file#"$modded/"}
    echo "Diffing $relativeFileName"

    strip_cr "$clean/$relativeFileName" > /dev/null
    strip_cr "$file" > /dev/null

    outFile=$(echo equilinox-patches/"$(echo $relativeFileName | cut -d. -f1)".patch)
    patchContents=$(diff -u --label a/$relativeFileName "$clean/$relativeFileName" --label b/$relativeFileName "$file")

    if [ -f "$outFile" ]
    then
        patchContentsCut=$(echo "$patchContents" | tail -n +3)
        patchContentOld=$(cat "$outFile" | tail -n +3)
        if [ "$patchContentsCut" != "$patchContentOld" ] ; then
            echo "$outFile changed"
            echo "$patchContents" > "$outFile"
        fi
    else
	    mkdir -p "$(dirname $outFile)"
        echo "New patch, $outFile"
        echo "$patchContents" > "$outFile"
    fi
done