#!/bin/sh

set -eu
usage='Update the source tree according to DIR.freshen, and if doing
so creates the directory for the first time, apply all *.patch
files in DIR.patches.'
eval "$(args freshen-and-patch dir -u "$usage" -- "$@")"

[ -f $dir.freshen ] || {
    echo "can't find freshen file: $dir.freshen" >&2
    exit 2
}

if [ -d $dir -o ! -d $dir.patches ]; then
    apply_patches=false
else
    apply_patches=true
fi

freshen $dir

if $apply_patches; then
    if [ -d $dir.patches ]; then
        for patch in $dir.patches/*.patch; do
            echo "freshen-and-patch: applying patch $patch"
            (cd $dir; patch --batch -p0 < $patch)
        done
    else
        echo "freshen-and-patch: no patch directory: $dir.patches"
    fi
else
    echo "freshen-and-patch: source directory already existed; assumed patched"
fi