#!/bin/bash

if [[ $# -lt 2 ]]
then
    echo "applies the current git diff in source version in each target version"
    echo "can be used to, for example, make changes in "'unversioned'" then"
    echo "duplicate those changes in previous versions"
    echo
    echo "usage: from docs directory,"
    echo "  ./scripts/versionpatch.sh <src> <target1> <target2> ..."
    echo
    echo "example:"
    echo "  ./scripts/versionpatch.sh unversioned v8.0.0 v7.0.0"
    exit
fi

src_version=$1

shift
for version in $*; do
    echo Patching in `pwd`

    # copy new files
    pushd pages/versions/$src_version > /dev/null
    for f in $(git ls-files -o --exclude-standard); do
        mkdir -p ../$version/$(dirname $f)
        cp $f ../$version/$(dirname $f)/
    done
    popd > /dev/null

    # patch changes in existing files
    pushd pages/versions/$version > /dev/null
    git diff -- ../$src_version | patch -p5
    popd > /dev/null
done