Added rakefile.

Rakefile.rb

@@ -0,0 +1,137 @@
+require 'rubygems'
+require 'flacinfo'
+require 'mp3info'
+require 'fileutils'
+
+FLACDIR = "flac/"
+MP3MIRROR = "mp3mirror/"
+LAMEOPTS = [ "-V2", "--quiet" ] 
+
+#yawn, constants, la la la
+def tag_mapping
+{
+	#however mp3info maps the 1st 4
+	"ALBUM" => "album", #:TALB,
+	"TITLE" => "title", #:TIT2,
+	"ARTIST" => "artist", #:TPE1,
+	#Argh! This must be an int.
+	"TRACKNUMBER" => "tracknum", #:TRCK,
+}
+end
+
+def shell_escape(str)
+	escaped = str.gsub('"',%q(\"))
+	ans = '"' + escaped + '"'
+	sanity = `echo #{ans}`.chomp
+	raise "escape issue: \n#{str}\n#{sanity}\n#{ans}" unless str == sanity
+	return ans
+end
+
+#work begins here!
+albums = FileList["#{FLACDIR}/**/"]
+
+#This is the transcodify bit:
+albums.each do |album|
+	albummp3prep = album + "!mp3prep"
+
+	#Make a task for making the tasks of mp3mirroring
+	#this way we don't need to search for every last file on starup
+	task albummp3prep do
+		flacs = FileList["#{album}/*.flac"]
+		next if flacs.size == 0
+
+		info = album + "!info"
+		task info do
+			puts( "\nWorking on #{album}\n\n"  )
+		end
+
+		task album => info
+
+		mp3albumdir = album.sub( FLACDIR, MP3MIRROR )
+		directory mp3albumdir
+		task album => mp3albumdir
+
+		#maybe we made a mess last time?
+		failures = FileList["#{mp3albumdir}/*.xmp3"]
+		failures.each do |failure|
+			task failure do
+				File.delete( failure )
+			end
+			task album=>failure
+		end
+
+		flacs.each do |flac|
+			mp3task = flac.ext("mp3")
+			mp3task = mp3task.sub( FLACDIR, MP3MIRROR )
+
+			#transcode from flac->mp3
+			#TODO: Don't transcode just because the flac tags have changed.
+			file mp3task do
+				puts("#{album}:#{flac} -> #{mp3task}")
+				intermediate = mp3task.ext("xmp3")
+				flaccommand = ["flac", "--decode", "--silent", "--stdout" ]
+				lamecommand = ["lame"] + LAMEOPTS + [ "-" ]
+
+				flaccommand = flaccommand.join(" ")
+				flaccommand += " " + shell_escape( flac )
+				lamecommand = lamecommand.join(" ")
+				lamecommand += " " + shell_escape( intermediate )
+
+				command = "#{flaccommand} | #{lamecommand}"
+				puts( "mp3task: #{command }\n\n\n" )
+				system( command ) or raise
+				FileUtils.mv( intermediate, mp3task ) or raise "Can't rename #{intermediate} to #{mp3task}"
+			end
+
+			#copy the tags over.
+			mp3tag = mp3task + "!tag"
+			task mp3tag => mp3task
+			task mp3tag do
+				puts "Tagging #{mp3task}"
+				#no flac write support yet :(
+				flactags = FlacInfo.new( flac )
+				Mp3Info.open( mp3task ) do |mp3info|
+					#The swish thing about mp3info is that it keeps track of wheather it changed or not
+					#so write away, it only does work if it has to.
+
+					flactags.tags.each do |key, val|
+						key = key.upcase
+						#puts "tag: #{key}=#{val}"
+						next unless tag_mapping.has_key?(key)
+						target = tag_mapping[key]
+						#Hack: Tracknum is an int in mp3 but str in flac
+						if target == "tracknum" then val = val.to_i end	
+						#puts "tag!: #{target}=#{val}"
+						mp3info.tag[target] = val
+					end
+				end
+			end
+
+			#gather everything up...
+			mp3do = mp3task + "!do"
+			task mp3do => mp3task
+			task mp3do => mp3tag
+			task album => mp3do
+		end
+
+		#don't forget the pretty pictures...
+		pictures = FileList["#{album}/*.jpg"] 
+		pictures.each do |pic|
+			mp3pic = pic.sub( FLACDIR, MP3MIRROR )
+			file mp3pic do
+				FileUtils.cp( pic, mp3pic )
+			end
+			task album => mp3pic
+		end
+	end #task albummp3prep
+
+	albummp3 = album + "!mp3"
+	task albummp3 => albummp3prep
+	task albummp3 => album
+
+	task :allalbums => albummp3
+end
+
+task :default => :allalbums
+
+