#!/bin/bash
# Copyright 2016 VMware, Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Lists the non-standard library Go packages the specified package depends
# on.
#
# Usage: script/go-deps.sh pkg
#
#     pkg       This is github.com/vmware/vic/cmd/imagec for example
#
# If VIC_CACHE_DEPS environment variable is defined, this script will attempt to read
# cached dependencies from disk if those exist. If they are not cached, dependencies will be
# regenerated and cached.

cache_dir=.godeps_cache

pkg=$1
flags=$2
cachedname=`echo .$1.godeps_cache | sed 's/\//_/g'`

if [ -d "$pkg" ]; then

    if [[ "$flags" == *d* ]]; then
        # Only output if make is given the '-d' flag
        echo "Generating deps for $pkg" >&2
    fi

    if [ -n "$VIC_CACHE_DEPS" ]; then
        mkdir -p $cache_dir
        if [ ! -f $cache_dir/$cachedname ]; then
            go list -f '{{join .Deps "\n"}}' github.com/vmware/vic/"$pkg" 2>/dev/null | \
                xargs go list -f '{{if not .Standard}}{{.ImportPath}}{{end}}' 2>/dev/null | \
                sed -e 's:github.com/vmware/vic/\(.*\)$:\1/*:' > "$cache_dir/$cachedname"
        fi
        cat "$cache_dir/$cachedname"
    else
        go list -f '{{join .Deps "\n"}}' github.com/vmware/vic/"$pkg" 2>/dev/null | \
            xargs go list -f '{{if not .Standard}}{{.ImportPath}}{{end}}' 2>/dev/null | \
            sed -e 's:github.com/vmware/vic/\(.*\)$:\1/*:'
    fi
else
    if [[ "$flags" == *d* ]]
    then
        echo "$0: package '$pkg' does not exist" >&2
    fi
fi