--!A cross-platform build utility based on Lua
--
-- Licensed to the Apache Software Foundation (ASF) under one
-- or more contributor license agreements.  See the NOTICE file
-- distributed with this work for additional information
-- regarding copyright ownership.  The ASF licenses this file
-- to you 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.
-- 
-- Copyright (C) 2015 - 2019, TBOOX Open Source Group.
--
-- @author      ruki
-- @file        find_pcre2.lua
--

-- imports
import("package.manager.find_package")

-- find pcre2 
--
-- @param opt   the package options. e.g. see the options of find_package()
--
-- @return      see the return value of find_package()
--
function main(opt)

    -- find package by the builtin script
    local result = opt.find_package("pcre2", opt)

    -- find package from the homebrew package manager
    if not result and opt.plat == os.host() and opt.arch == os.arch() then
        for _, width in ipairs({"8", "16", "32"}) do
            result = find_package("brew::pcre2/libpcre2-" .. width, opt)
            if result then
                break
            end
        end
    end

    -- patch PCRE2_CODE_UNIT_WIDTH
    if result and not result.defines then       
        local links = {}
        for _, link in ipairs(result.links) do
            links[link] = true
        end
        for _, width in ipairs({"8", "16", "32"}) do
            if links["pcre2-" .. width] then
                result.links   = {"pcre2-" .. width}
                result.defines = {"PCRE2_CODE_UNIT_WIDTH=" .. width}
                break
            end
        end
    end
    return result
end