--!A cross-platform build utility based on Lua
--
-- 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.
-- 
-- Copyright (C) 2015-2020, TBOOX Open Source Group.
--
-- @author      ruki
-- @file        clang_cl.lua
--

-- inherit cl
inherit("cl")
import("core.base.option")
import("core.base.colors")

-- init it
function init(self)

    -- init flags map
    self:set("mapflags",
    {
        -- warnings
        ["-W1"] = "-Wall"
    ,   ["-W2"] = "-Wall"
    ,   ["-W3"] = "-Wall"
    ,   ["-W4"] = "-Wextra"
    ,   ["-Weverything"] = "-Wall -Wextra -Weffc++"

        -- language
    ,   ["-ansi"]                   = "-Xclang -ansi"
    ,   ["-std=c89"]                = "-Xclang -std=c89"
    ,   ["-std=c99"]                = "-Xclang -std=c99"
    ,   ["-std=c11"]                = "-Xclang -std=c11"
    ,   ["-std=gnu89"]              = "-Xclang -std=gnu89"
    ,   ["-std=gnu99"]              = "-Xclang -std=gnu99"
    ,   ["-std=gnu11"]              = "-Xclang -std=gnu11"
    ,   ["-std=c++98"]              = "-Xclang -std=c++98"
    ,   ["-std=c++11"]              = "-Xclang -std=c++11"
    ,   ["-std=c++14"]              = "-Xclang -std=c++14"
    ,   ["-std=c++17"]              = "-Xclang -std=c++17"
    ,   ["-std=c++1z"]              = "-Xclang -std=c++1z"
    ,   ["-std=c++1a"]              = "-Xclang -std=c++1a"
    ,   ["-std=c++2a"]              = "-Xclang -std=c++2a"
    ,   ["-std=gnu++98"]            = "-Xclang -std=gnu++98"
    ,   ["-std=gnu++11"]            = "-Xclang -std=gnu++11"
    ,   ["-std=gnu++14"]            = "-Xclang -std=gnu++14"
    ,   ["-std=gnu++17"]            = "-Xclang -std=gnu++17"
    ,   ["-std=gnu++1z"]            = "-Xclang -std=gnu++1z"
    ,   ["-std=gnu++1a"]            = "-Xclang -std=gnu++1a"
    ,   ["-std=gnu++2a"]            = "-Xclang -std=gnu++2a"
    })
end

-- has color diagnostics?
function _has_color_diagnostics(self)
    local colors_diagnostics = _g._HAS_COLOR_DIAGNOSTICS
    if colors_diagnostics == nil then
        if io.isatty() and (colors.color8() or colors.color256()) then
            local theme = colors.theme()
            if theme and theme:name() ~= "plain" then
                -- for clang
                if self:has_flags("-fcolor-diagnostics", "cxflags") then
                    colors_diagnostics = "-fcolor-diagnostics"
                -- for gcc
                elseif self:has_flags("-fdiagnostics-color=always", "cxflags") then
                    colors_diagnostics = "-fdiagnostics-color=always"
                end
            end
        end
        colors_diagnostics = colors_diagnostics or false
        _g._HAS_COLOR_DIAGNOSTICS = colors_diagnostics
    end
    return colors_diagnostics
end

-- make the optimize flag
function nf_optimize(self, level)

    -- the maps
    local maps = 
    {   
        none       = "-O0"
    ,   fast       = "-O1"
    ,   faster     = "-O2"
    ,   fastest    = "-O3"
    ,   smallest   = "-Os"
    ,   aggressive = "-Ofast"
    }

    -- make it
    return maps[level] 
end

-- make the language flag
function nf_language(self, stdname)

    -- the stdc maps
    if _g.cmaps == nil then
        _g.cmaps = 
        {
            -- stdc
            ansi        = "-Xclang -ansi"
        ,   c89         = "-Xclang -std=c89"
        ,   gnu89       = "-Xclang -std=gnu89"
        ,   c99         = "-Xclang -std=c99"
        ,   gnu99       = "-Xclang -std=gnu99"
        ,   c11         = "-Xclang -std=c11"
        ,   gnu11       = "-Xclang -std=gnu11"
        }
    end

    -- the stdc++ maps
    if _g.cxxmaps == nil then
        _g.cxxmaps = 
        {
            cxx98        = "-Xclang -std=c++98"
        ,   gnuxx98      = "-Xclang -std=gnu++98"
        ,   cxx11        = "-Xclang -std=c++11"
        ,   gnuxx11      = "-Xclang -std=gnu++11"
        ,   cxx14        = "-Xclang -std=c++14"
        ,   gnuxx14      = "-Xclang -std=gnu++14"
        ,   cxx17        = "-Xclang -std=c++17"
        ,   gnuxx17      = "-Xclang -std=gnu++17"
        ,   cxx1z        = "-Xclang -std=c++1z"
        ,   gnuxx1z      = "-Xclang -std=gnu++1z"
        ,   cxx20        = "-Xclang -std=c++2a"
        ,   gnuxx20      = "-Xclang -std=gnu++2a"
        ,   cxx2a        = "-Xclang -std=c++2a"
        ,   gnuxx2a      = "-Xclang -std=gnu++2a"
        }
        local cxxmaps2 = {}
        for k, v in pairs(_g.cxxmaps) do
            cxxmaps2[k:gsub("xx", "++")] = v
        end
        table.join2(_g.cxxmaps, cxxmaps2)
    end

    -- select maps
    local maps = _g.cmaps
    if self:kind() == "cxx" or self:kind() == "mxx" then
        maps = _g.cxxmaps
    end

    -- make it
    return maps[stdname]
end

-- compile the source file
function compile(self, sourcefile, objectfile, dependinfo, flags)

    -- ensure the object directory
    -- @note this path here has been normalized, we can quickly find it by the unique path separator prompt
    os.mkdir(path.directory(objectfile, path.sep()))

    -- compile it
    local outdata = try
    {
        function ()

            -- generate includes file
            local compflags = flags
            if dependinfo then
                compflags = table.join(flags, "-showIncludes")
            end

            -- has color diagnostics? enable it
            local colors_diagnostics = _has_color_diagnostics(self) 
            if colors_diagnostics then
                compflags = table.join(compflags, colors_diagnostics)
            end

            -- do compile
            return os.iorunv(compargv(self, sourcefile, objectfile, compflags))
        end,
        catch
        {
            function (errors)

                -- try removing the old object file for forcing to rebuild this source file
                os.tryrm(objectfile)

                -- parse and strip errors
                local lines = errors and tostring(errors):split('\n', {plain = true}) or {}
                if not option.get("verbose") then

                    -- find the start line of error
                    local start = 0
                    for index, line in ipairs(lines) do
                        if line:find("error:", 1, true) or line:find("错误：", 1, true) then
                            start = index
                            break
                        end
                    end

                    -- get 16 lines of errors
                    if start > 0 then
                        lines = table.slice(lines, start, start + ifelse(#lines - start > 16, 16, #lines - start))
                    end
                end

                -- raise compiling errors
                raise(#lines > 0 and table.concat(lines, "\n") or "")
            end
        },
        finally
        {
            function (ok, outdata, errdata)
                -- show warnings?
                if ok and errdata and #errdata > 0 and (option.get("diagnosis") or option.get("warning")) then
                    local lines = errdata:split('\n', {plain = true})
                    if #lines > 0 then
                        local warnings = table.concat(table.slice(lines, 1, ifelse(#lines > 8, 8, #lines)), "\n")
                        cprint("${color.warning}%s", warnings)
                    end
                end
            end
        }
    }

    -- generate the dependent includes
    if dependinfo and outdata then
        dependinfo.depfiles_cl = outdata
    end
end