#!/usr/bin/ruby
#
#  BuildProject board=... mcu=... -- FILE1 FILE2 FILE3
#
#  AVRsack
#
#  Created by Matthias Neeracher on 11/26/14.
#  Copyright © 2014 Aere Perennius. All rights reserved.
#

require 'fileutils.rb'

BUILD = {
    'board'   => 'uno',
    'mcu'     => 'atmega328p',
    'f_cpu'   => 16000000,
    'core'    => 'arduino',
    'variant' => 'standard',
}

def parseArguments
    while ARGV.length > 0 do
        param = ARGV.shift
        break if param == '--'
        param =~ /(\S+?)=(\S*)/
        BUILD[$1] = $2
    end
end

def createBuildDirectory
    $BUILD_DIR   = "build/#{BUILD['board']}"
    $SKETCH_DIR  = "#{$BUILD_DIR}/sketch"
    FileUtils::mkdir_p "#{$SKETCH_DIR}", :verbose => true
end

def parseInoFiles
    $LIBPATH   = BUILD['libs'].split(':').reverse
    $LIBRARIES = []
    ARGV.each_index do |arg|
        if ARGV[arg] =~ /\.ino$/
            outName     = "#{$SKETCH_DIR}/"+File.basename(ARGV[arg], '.ino')+".cpp"
            outFile     = File.open(outName, 'w')
            File.open(ARGV[arg], 'r') do |ino|
                contents = ino.read
                # Find protypes:
                prototypes = contents.dup
                # - Strip comments, quoted strings, and preprocessor directives
                prototypes.gsub!(%r{'(?:[^']|\\')+'|"(?:[^"]|\\")*"|//.*?$|/\*.*?\*/|^\s*?#.*?$}m, ' ')
                # Collapse braces
                while prototypes.sub!(/(\{)(?:[^{}]+|\{[^{}]*\})/m, '\1') do
                end
                existingProto = {}
                prototypes.scan(/[\w\[\]\*]+\s+[&\[\]\*\w\s]+\([&,\[\]\*\w\s]*\)(?=\s*;)/) {|p|
                    existingProto[smashSpaces(p)] = true
                }
                proto = []
                prototypes.scan(/[\w\[\]\*]+\s+[&\[\]\*\w\s]+\([&,\[\]\*\w\s]*\)(?=\s*{)/) {|p|
                    p = smashSpaces(p)
                    proto << p unless existingProto[p]
                }
                contents.each_line do |line|
                    if line =~ /^\s*#include\s+[<"](.*)[">]\s*(#.*)?$/
                        addLibrary($1)
                    end
                end
            end
            outFile.close
            ARGV[arg]   = outName
        end
    end
end

def smashSpaces(s)
    return s.gsub(/(\W)\s+(\W)/, '\1\2').gsub(/\s+/, ' ')
end
                                 
def addLibrary(header)
    $LIBPATH.each do |path|
        Dir.glob("#{path}/*").each do |lib|
            if File.exists?("#{lib}/#{header}")
                $LIBRARIES << lib
            end
        end
    end
end

parseArguments
createBuildDirectory
parseInoFiles

File.open("#{$BUILD_DIR}/Rakefile", 'w') do |rakeFile|
    rakeFile.print <<END_RAKE
LIBRARIES=#{$LIBRARIES.join(':')}
FILES    = [
    #{ARGV.join('\n')}
]
END_RAKE

end