#!/bin/sh

# Copyright 2015 Google Inc.
#
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# This script will update Skia's dependenciess as necessary and run
# gyp if needed.

# Example usage (assumes Posix-standard shell, git installed):
#
#   git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
#   export PATH="${PWD}/depot_tools:${PATH}"
#   git clone https://skia.googlesource.com/skia
#   cd skia
#   bin/sync-and-gyp && ninja -C out/Debug
#   out/Debug/dm
#
# Once changes are made to DEPS or gyp/ or the source, recompile Skia with:
#
#   ${skiadir}/bin/sync-and-gyp && ninja -C ${skiadir}/out/Debug

cd "$(dirname "$0")/.."

if ! [ -f .gclient ] ; then
    gclient config --name . --unmanaged 'https://skia.googlesource.com/skia'
fi

if ! [ -f DEPS ]; then
    echo DEPS file missing >&2
    exit 1
fi

if [ "$(git hash-object DEPS)" != "$(git config sync-deps.last)" ] ; then
    gclient sync || exit
    git config sync-deps.last "$(git hash-object DEPS)"
fi

function catifexists() { if [ -f "$1" ]; then cat "$1"; fi; }

function gyp_hasher() {
    {
        echo "$GYP_GENERATORS"
        echo "$GYP_DEFINES"
        find gyp -type f -print -exec git hash-object {} \;
    } | git hash-object --stdin
}

: ${SKIA_OUT:=out}
GYP_HASH=$(gyp_hasher)
HASH_PATH="${SKIA_OUT}/gyp_hash"
if [ "$GYP_HASH" != "$(catifexists "$HASH_PATH")" ]; then
    python ./gyp_skia || exit
    echo "$GYP_HASH" > "$HASH_PATH"
fi