#!/usr/bin/env ruby

# Copyright (C) 2013, 2014 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1.  Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer. 
# 2.  Redistributions in binary form must reproduce the above copyright
#     notice, this list of conditions and the following disclaimer in the
#     documentation and/or other materials provided with the distribution. 
#
# THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

require 'getoptlong'
require 'pathname'
require 'shellwords'
require 'tmpdir'

def mychdir(path)
    puts "-> #{path.to_s}"
    Dir.chdir(path) {
        yield
    }
    puts "<- #{path.to_s}"
end

def mysys(*cmd)
    cmd = cmd.map{|value| value.to_s}
    commandArray = cmd.map{|value| Shellwords.shellescape(value)}.join(' ')
    $stderr.puts " $ #{commandArray}"
    raise unless system(*cmd)
end

$libraryPackage = Pathname.new("LLVMLibraries.tar.bz2")
$includePackage = Pathname.new("LLVMIncludes.tar.bz2")
$llvmBuild = Pathname.new("./llvm")
$llvmBinary = Pathname.new("./llvm/Release")
$llvmSource = Pathname.new("./llvm")
$prefix = nil
$compression = "bzip2"

def usage
    puts "export-llvm-build"
    puts
    puts "--library-package  (-l)   Change where to put the compressed library package."
    puts "                          Default is #{$libraryPackage}."
    puts "--include-package  (-i)   Change wehre to put the compressed header package."
    puts "                          Default is #{$includePackage}."
    puts "--llvm-build       (-b)   Change which LLVM build directory to use."
    puts "                          Default is #{$llvmBuild}."
    puts "--llvm-binary      (-B)   Change which LLVM binary directory to use."
    puts "                          Default is #{$llvmBinary}."
    puts "--llvm-source      (-s)   Change which LLVM source directory to use."
    puts "                          Default is #{$llvmSource}."
    puts "--prefix           (-p)   Use an \"installed\" LLVM with the given prefix."
    puts "--compression             Change what compression to do. Can be one of gzip,"
    puts "                          bzip2, or none."
    puts "                          Default is #{$compression}."
    exit 1
end

GetoptLong.new(['--help', '-h', GetoptLong::NO_ARGUMENT],
               ['--library-package', '-l', GetoptLong::REQUIRED_ARGUMENT],
               ['--include-package', '-i', GetoptLong::REQUIRED_ARGUMENT],
               ['--llvm-build', '-b', GetoptLong::REQUIRED_ARGUMENT],
               ['--llvm-binary', '-B', GetoptLong::REQUIRED_ARGUMENT],
               ['--llvm-source', '-s', GetoptLong::REQUIRED_ARGUMENT],
               ['--prefix', '-p', GetoptLong::REQUIRED_ARGUMENT],
               ['--compression', GetoptLong::REQUIRED_ARGUMENT]).each {
    | opt, arg |
    case opt
    when '--help'
        usage
    when '--library-package'
        $libraryPackage = Pathname.new(arg)
    when '--include-package'
        $includePackage = Pathname.new(arg)
    when '--llvm-build'
        $llvmBuild = Pathname.new(arg)
    when '--llvm-binary'
        $llvmBinary = Pathname.new(arg)
    when '--llvm-source'
        $llvmSource = Pathname.new(arg)
    when '--prefix'
        $prefix = Pathname.new(arg)
    when '--compression'
        $compression = arg
    else
        raise
    end
}

$currentPath = Pathname.pwd

def compressionChar
    case $compression
    when "gzip"
        "z"
    when "bzip2"
        "y"
    when "none"
        ""
    else
        raise "Bad choice of compression."
    end
end

if $prefix
    $llvmBinary = $prefix
    $llvmBuild = $prefix
    $llvmSource = $prefix
end

mychdir($llvmBinary + "lib") {
    mysys("tar", "-c#{compressionChar}vf", ($currentPath + $libraryPackage).to_s,
          *Dir.entries('.').select {
              | value |
              value =~ /\.a$/ and value !~ /libgtest/
          })
}

Dir.mktmpdir {
    | directory |
    directory = Pathname.new(directory).realpath
    mychdir($llvmSource) {
        begin
            mysys("svn", "export", "include", directory + "include")
        rescue
            mysys("ditto", "include", directory + "include")
        end
    }
    ["include/llvm/Config"].each {
        | genDirName |
        configSrcPath = $llvmBuild + genDirName
        raise unless configSrcPath.directory?
        configDstPath = directory + genDirName
        Dir.foreach(configSrcPath) {
            | filename |
            next unless filename =~ /\.def$/ or filename =~ /\.h$/
            mysys("cp", configSrcPath + filename, configDstPath + filename)
        }
    }
    ["include/llvm/Support/DataTypes.h"].each {
        | genFileName |
        mysys("cp", $llvmBuild + genFileName, directory + genFileName)
    }
    mychdir(directory + "include") {
        mysys("tar", "-cyvf", $currentPath + $includePackage, ".")
    }
}

puts
puts "LLVM has been packaged for use by WebKit."
puts
puts "You can use it right now by setting these environment variables:"
puts
puts "export LLVM_LIBRARY_PACKAGE=#{Shellwords.shellescape($libraryPackage.realpath.to_s)}"
puts "export LLVM_INCLUDE_PACKAGE=#{Shellwords.shellescape($includePackage.realpath.to_s)}"
puts