#!/usr/bin/python
#
# msdi2ly.py -- LilyPond midi import script
# 
# source file of the GNU LilyPond music typesetter
#
# (c) 1998--2006  Han-Wen Nienhuys <hanwen@cs.uu.nl>
#                 Jan Nieuwenhuizen <janneke@gnu.org>


'''
TODO:
	* test on weird and unquantised midi input (lily-devel)
	* update doc and manpage

	* simply insert clef changes whenever too many ledger lines
		[to avoid tex capacity exceeded]
	* do not ever quant skips
	* better lyrics handling
	* [see if it is feasible to] move ly-classes to library for use in
		other converters, while leaving midi specific stuff here
'''

import os
import string
import sys


################################################################
# Users of python modules should include this snippet.
#
libdir = '/usr/lib/lilypond/2.8.8'
if not os.path.isdir (libdir):
        libdir = '/usr/lib/lilypond/2.8.8'

# ugh
datadir = '/usr/share/lilypond/2.8.8'
if os.environ.has_key ('LILYPONDPREFIX'):
	datadir = os.environ['LILYPONDPREFIX']
	while datadir[-1] == os.sep:
		datadir= datadir[:-1]
	libdir = datadir.replace ('/share/', '/lib/')

if os.path.exists (os.path.join (datadir, 'lib/lilypond/2.8.8/')):
	libdir = os.path.join (libdir, 'lib/lilypond/2.8.8/')

if os.path.exists (os.path.join (datadir, 'lib/lilypond/current/')):
	libdir = os.path.join (libdir, 'lib/lilypond/current/')

sys.path.insert (0, os.path.join (libdir, 'python'))

# dynamic relocation, for GUB binaries.
bindir = os.path.split (sys.argv[0])[0]

for prefix_component in ['share', 'lib']:
	datadir = os.path.abspath (bindir + '/../%s/lilypond/current/python/' % prefix_component)
	sys.path.insert (0, datadir)

import midi
import lilylib as ly

################################################################
################ CONSTANTS


output_name = ''
LINE_BELL = 60
scale_steps = [0,2,4,5,7,9,11]
global_options = None


clocks_per_1 = 1536
clocks_per_4 = 0

time = 0
reference_note = 0
start_quant_clocks = 0

duration_quant_clocks = 0
allowed_tuplet_clocks = []


################################################################

localedir = '/usr/share/locale'
try:
	import gettext
	gettext.bindtextdomain ('lilypond', localedir)
	gettext.textdomain ('lilypond')
	_ = gettext.gettext
except:
	def _ (s):
		return s

program_name = sys.argv[0]
program_version = '2.8.8'

errorport = sys.stderr

def identify ():
	sys.stdout.write ('%s (GNU LilyPond) %s\n' % (program_name, program_version))

def warranty ():
	identify ()
	sys.stdout.write ('''
Copyright (c) %s by

  Han-Wen Nienhuys
  Jan Nieuwenhuizen

%s
%s
'''  ( '2001--2006',
       _('Distributed under terms of the GNU General Public License.'),
       _('It comes with NO WARRANTY.')))


def progress (s):
	errorport.write (s + '\n')

def warning (s):
	progress (_ ("warning: ") + s)
		
def error (s):
	progress (_ ("error: ") + s)
	raise _ ("Exiting ... ")

def system (cmd, ignore_error = 0):
	return ly.system (cmd, ignore_error=ignore_error)

def strip_extension (f, ext):
	(p, e) = os.path.splitext (f)
	if e == ext:
		e = ''
	return p + e




class Duration:
	allowed_durs = (1, 2, 4, 8, 16, 32, 64, 128)
	def __init__ (self, clocks):
		self.clocks = clocks
		if clocks <= 0:
			self.clocks = duration_quant_clocks
		(self.dur, self.num, self.den) = self.dur_num_den (clocks)
		
	def dur_num_den (self, clocks):
		for i in range (len (allowed_tuplet_clocks)):
			if clocks == allowed_tuplet_clocks[i]:
				return global_options.allowed_tuplets[i]

		dur = 0; num = 1; den = 1;
		g = gcd (clocks, clocks_per_1)
		if g:
			(dur, num) = (clocks_per_1 / g, clocks / g)
		if not dur in self.allowed_durs:
			dur = 4; num = clocks; den = clocks_per_4
		return (dur, num, den)

	def dump (self):
		if self.den == 1:
			if self.num == 1:
				s = '%d' % self.dur
			elif self.num == 3 and self.dur != 1:
				s = '%d.' % (self.dur / 2)
			else:
				s = '%d*%d' % (self.dur, self.num)
		else:
			s = '%d*%d/%d' % (self.dur, self.num, self.den)
			
		global reference_note
		reference_note.duration = self

		return s

	def compare (self, other):
		return self.clocks - other.clocks

def sign (x):
	if x >= 0:
		return 1
	else:
		return -1

class Note:
	names = (0, 0, 1, 1, 2, 3, 3, 4, 4, 5, 5, 6)
	alterations = (0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0)
	alteration_names = ('eses', 'es', '', 'is' , 'isis')
	def __init__ (self, clocks, pitch, velocity):
		self.pitch = pitch
		self.velocity = velocity
		# hmm
		self.clocks = clocks
		self.duration = Duration (clocks)
		(self.octave, self.notename, self.alteration) = self.o_n_a ()

	def o_n_a (self):
		# major scale: do-do
		# minor scale: la-la  (= + 5) '''

		n = self.names[(self.pitch) % 12]
 		a = self.alterations[(self.pitch) % 12]

		if a and global_options.key.flats:
			a = - self.alterations[(self.pitch) % 12]
			n = (n - a) % 7

		#  By tradition, all scales now consist of a sequence
		#  of 7 notes each with a distinct name, from amongst
		#  a b c d e f g.  But, minor scales have a wide
		#  second interval at the top - the 'leading note' is
		#  sharped. (Why? it just works that way! Anything
		#  else doesn't sound as good and isn't as flexible at
		#  saying things. In medieval times, scales only had 6
		#  notes to avoid this problem - the hexachords.)

		#  So, the d minor scale is d e f g a b-flat c-sharp d
		#  - using d-flat for the leading note would skip the
		#  name c and duplicate the name d.  Why isn't c-sharp
		#  put in the key signature? Tradition. (It's also
		#  supposedly based on the Pythagorean theory of the
		#  cycle of fifths, but that really only applies to
		#  major scales...)  Anyway, g minor is g a b-flat c d
		#  e-flat f-sharp g, and all the other flat minor keys
		#  end up with a natural leading note. And there you
		#  have it.

		#  John Sankey <bf250@freenet.carleton.ca>
		#
		#  Let's also do a-minor: a b c d e f gis a
		#
		#  --jcn

		o = self.pitch / 12 - 4

		key = global_options.key
		if key.minor:
			# as -> gis
			if key.sharps == 0 and key.flats == 0 \
			   and n == 5 and a == -1:
				n = 4; a = 1
			# des -> cis
       			elif key.flats == 1 and n == 1 and a == -1:
				n = 0; a = 1
			# ges -> fis
			elif key.flats == 2 and n == 4 and a == -1:
				n = 3; a = 1
			# g -> fisis
			elif key.sharps == 5 and n == 4 and a == 0:
				n = 3; a = 2
			# d -> cisis
			elif key.sharps == 6 and n == 1 and a == 0:
				n = 0; a = 2
			# a -> gisis
			elif key.sharps == 7 and n == 5 and a == 0:
				n = 4; a = 2

		# b -> ces
		if key.flats >= 6 and n == 6 and a == 0:
 			n = 0; a = -1; o = o + 1
		# e -> fes
		if key.flats >= 7 and n == 2 and a == 0:
 			n = 3; a = -1

		# f -> eis
		if key.sharps >= 3 and n == 3 and a == 0:
 			n = 2; a = 1
		# c -> bis
		if key.sharps >= 4 and n == 0 and a == 0:
 			n = 6; a = 1; o = o - 1

		return (o, n, a)
		
        def __repr__ (self):
		s = chr ((self.notename + 2)  % 7 + ord ('a'))
                return 'Note(%s %s)' % (s, self.duration.dump())

	def dump (self, dump_dur = 1):
		global reference_note
		s = chr ((self.notename + 2)  % 7 + ord ('a'))
		s = s + self.alteration_names[self.alteration + 2]
		if global_options.absolute_pitches:
			commas = self.octave
		else:
			delta = self.pitch - reference_note.pitch
			commas = sign (delta) * (abs (delta) / 12)
			if ((sign (delta) \
			     * (self.notename - reference_note.notename) + 7) \
			    % 7 >= 4) \
			    or ((self.notename == reference_note.notename) \
				and (abs (delta) > 4) and (abs (delta) < 12)):
				commas = commas + sign (delta)
			
		if commas > 0:
			s = s + "'" * commas
		elif commas < 0:
			s = s + "," * -commas

		## FIXME: compile fix --jcn
		if dump_dur and (global_options.explicit_durations \
		   or self.duration.compare (reference_note.duration)):
			s = s + self.duration.dump ()

		reference_note = self
		
		# TODO: move space
		return s + ' '


class Time:
	def __init__ (self, num, den):
		self.clocks = 0
		self.num = num
		self.den = den

	def bar_clocks (self):
		return clocks_per_1 * self.num / self.den

        def __repr__ (self):
                return 'Time(%d/%d)' % (self.num, self.den)
        
	def dump (self):
		global time
		time = self
		return '\n  ' + '\\time %d/%d ' % (self.num, self.den) + '\n  '

class Tempo:
	def __init__ (self, seconds_per_1):
		self.clocks = 0
		self.seconds_per_1 = seconds_per_1

        def __repr__ (self):
                return 'Tempo(%d)' % self.bpm ()
        
        def bpm (self):
                return 4 * 60 / self.seconds_per_1
        
	def dump (self):
		return '\n  ' + '\\tempo 4 = %d ' % (self.bpm()) + '\n  '

class Clef:
	clefs = ('"bass_8"', 'bass', 'violin', '"violin^8"')
	def __init__ (self, type):
		self.type = type

	def __repr__ (self):
                return 'Clef(%s)' % self.clefs[self.type]
        
	def dump (self):
		return '\n  \\clef %s\n  ' % self.clefs[self.type]

class Key:
	key_sharps = ('c', 'g', 'd', 'a', 'e', 'b', 'fis')
	key_flats = ('BUG', 'f', 'bes', 'es', 'as', 'des', 'ges')

	def __init__ (self, sharps, flats, minor):
		self.clocks = 0
		self.flats = flats
		self.sharps = sharps
		self.minor = minor

	def dump (self):
		global_options.key = self

		s = ''
		if self.sharps and self.flats:
                        pass
		else:
                        if self.flats:
				k = (ord ('cfbeadg'[self.flats % 7]) - ord ('a') - 2 -2 * self.minor + 7) % 7
			else:
				k = (ord ('cgdaebf'[self.sharps % 7]) - ord ('a') - 2 -2 * self.minor + 7) % 7
  
			if not self.minor:
				name = chr ((k + 2) % 7 + ord ('a'))
			else:
				name = chr ((k + 2) % 7 + ord ('a'))

			# fis cis gis dis ais eis bis
			sharps = (2, 4, 6, 1, 3, 5, 7)
			# bes es as des ges ces fes
			flats = (6, 4, 2, 7, 5, 3, 1)
			a = 0
			if self.flats:
				if flats[k] <= self.flats:
					a = -1
			else:
				if sharps[k] <= self.sharps:
					a = 1

			if a:
				name = name + Note.alteration_names[a + 2]

			s = '\\key ' + name
			if self.minor:
				s = s + ' \\minor'
			else:
				s = s + ' \\major'

		return '\n\n  ' + s + '\n  '


class Text:
	text_types = (
		'SEQUENCE_NUMBER',
		'TEXT_EVENT',
		'COPYRIGHT_NOTICE',
		'SEQUENCE_TRACK_NAME',
		'INSTRUMENT_NAME',
		'LYRIC',
		'MARKER',
		'CUE_POINT',)
	
	def __init__ (self, type, text):
		self.clocks = 0
		self.type = type
		self.text = text

	def dump (self):
		# urg, we should be sure that we're in a lyrics staff
		if self.type == midi.LYRIC:
			s = '"%s"' % self.text
			d = Duration (self.clocks)
			if global_options.explicit_durations \
			   or d.compare (reference_note.duration):
				s = s + Duration (self.clocks).dump ()
			s = s + ' '
		else:
			s = '\n  % [' + self.text_types[self.type] + '] ' + self.text + '\n  '
		return s

        def __repr__ (self):
                return 'Text(%d=%s)' % (self.type, self.text)



def split_track (track):
	chs = {}
	for i in range(16):
		chs[i] = []
		
	for e in track:
		data = list (e[1])
		if data[0] > 0x7f and data[0] < 0xf0:
			c = data[0] & 0x0f
			e = (e[0], tuple ([data[0] & 0xf0] + data[1:]))
			chs[c].append (e)
		else:
			chs[0].append (e)

	for i in range (16):
		if chs[i] == []:
			del chs[i]

	threads = []
	for v in chs.values ():
		events = events_on_channel (v)
		thread = unthread_notes (events)
		if len (thread):
			threads.append (thread)
	return threads


def quantise_clocks (clocks, quant):
 	q = int (clocks / quant) * quant
	if q != clocks:
		for tquant in allowed_tuplet_clocks:
		 	if int (clocks / tquant) * tquant == clocks:
				return clocks
	 	if 2 * (clocks - q) > quant:
 			q = q + quant
	return q

def end_note (pitches, notes, t, e):
	try:
		(lt, vel) = pitches[e]
		del pitches[e]

		i = len (notes) - 1 
		while i > 0:
			if notes[i][0] > lt:
				i = i -1
			else:
				break
		d = t - lt
		if duration_quant_clocks:
			d = quantise_clocks (d, duration_quant_clocks)
			if not d:
				d = duration_quant_clocks

		notes.insert (i + 1,
			    (lt, Note (d, e, vel)))

	except KeyError:
		pass

def events_on_channel (channel):
	pitches = {}

	notes = []
	events = []
	last_lyric = 0
	last_time = 0
	for e in channel:
		t = e[0]

		if start_quant_clocks:
			t = quantise_clocks (t, start_quant_clocks)


		if e[1][0] == midi.NOTE_OFF \
		   or (e[1][0] == midi.NOTE_ON and e[1][2] == 0):
			end_note (pitches, notes, t, e[1][1])
			
		elif e[1][0] == midi.NOTE_ON:
			if not pitches.has_key (e[1][1]):
				pitches[e[1][1]] = (t, e[1][2])
				
		# all include ALL_NOTES_OFF
		elif e[1][0] >= midi.ALL_SOUND_OFF \
		     and e[1][0] <= midi.POLY_MODE_ON:
			for i in pitches.keys ():
				end_note (pitches, notes, t, i)
				
		elif e[1][0] == midi.META_EVENT:
			if e[1][1] == midi.END_OF_TRACK:
				for i in pitches.keys ():
					end_note (pitches, notes, t, i)
				break

			elif e[1][1] == midi.SET_TEMPO:
				(u0, u1, u2) = map (ord, e[1][2])
				us_per_4 = u2 + 256 * (u1 + 256 * u0)
				seconds_per_1 = us_per_4 * 4 / 1e6
				events.append ((t, Tempo (seconds_per_1)))
			elif e[1][1] == midi.TIME_SIGNATURE:
				(num, dur, clocks4, count32) = map (ord, e[1][2])
				den = 2 ** dur 
				events.append ((t, Time (num, den)))
			elif e[1][1] == midi.KEY_SIGNATURE:
 				(alterations, minor) = map (ord, e[1][2])
				sharps = 0
				flats = 0
				if alterations < 127:
					sharps = alterations
				else:
					flats = 256 - alterations

				k = Key (sharps, flats, minor)
				events.append ((t, k))

				# ugh, must set key while parsing
				# because Note init uses key
				# Better do Note.calc () at dump time?
				global_options.key = k

			elif e[1][1] == midi.LYRIC \
			     or (global_options.text_lyrics and e[1][1] == midi.TEXT_EVENT):
				if last_lyric:
					last_lyric.clocks = t - last_time
					events.append ((last_time, last_lyric))
				last_time = t
				last_lyric = Text (midi.LYRIC, e[1][2])

			elif e[1][1] >= midi.SEQUENCE_NUMBER \
			     and e[1][1] <= midi.CUE_POINT:
				events.append ((t, Text (e[1][1], e[1][2])))
			else:
				if global_options.verbose:
					sys.stderr.write ("SKIP: %s\n" % `e`)
				pass
		else:
			if global_options.verbose:
				sys.stderr.write ("SKIP: %s\n" % `e`)
			pass

	if last_lyric:
		# last_lyric.clocks = t - last_time
		# hmm
		last_lyric.clocks = clocks_per_4
		events.append ((last_time, last_lyric))
		last_lyric = 0
		
	i = 0
	while len (notes):
		if i < len (events) and notes[0][0] >= events[i][0]:
			i = i + 1
		else:
			events.insert (i, notes[0])
			del notes[0]
	return events

def unthread_notes (channel):
	threads = []
	while channel:
		thread = []
		end_busy_t = 0
		start_busy_t = 0
		todo = []
		for e in channel:
			t = e[0]
			if e[1].__class__ == Note \
			   and ((t == start_busy_t \
				 and e[1].clocks + t == end_busy_t) \
			    or t >= end_busy_t):
				thread.append (e)
				start_busy_t = t
				end_busy_t = t + e[1].clocks
			elif e[1].__class__ == Time \
			     or e[1].__class__ == Key \
			     or e[1].__class__ == Text \
			     or e[1].__class__ == Tempo:
				thread.append (e)
			else:
				todo.append (e)
		threads.append (thread)
		channel = todo

	return threads

def gcd (a,b):
	if b == 0:
		return a
	c = a
	while c: 
		c = a % b
		a = b
		b = c
	return a
	
def dump_skip (skip, clocks):
	return skip + Duration (clocks).dump () + ' '

def dump (d):
	return d.dump ()

def dump_chord (ch):
	s = ''
	notes = []
	for i in ch:
		if i.__class__ == Note:
			notes.append (i)
		else:
			s = s + i.dump ()
	if len (notes) == 1:
		s = s + dump (notes[0])
	elif len (notes) > 1:
		global reference_note
		s = s + '<'
		s = s + notes[0].dump (dump_dur = 0)
		r = reference_note
		for i in notes[1:]:
			s = s + i.dump (dump_dur = 0 )
		s = s + '>'

		s = s + notes[0].duration.dump() + ' '
		reference_note = r
	return s

def dump_bar_line (last_bar_t, t, bar_count):
	s = ''
	bar_t = time.bar_clocks ()
	if t - last_bar_t >= bar_t:
		bar_count = bar_count + (t - last_bar_t) / bar_t
		
		if t - last_bar_t == bar_t:
			s = '|\n  %% %d\n  ' % bar_count
			last_bar_t = t
		else:
			# urg, this will barf at meter changes
			last_bar_t = last_bar_t + (t - last_bar_t) / bar_t * bar_t
			
	return (s, last_bar_t, bar_count)

			
def dump_channel (thread, skip):
	global reference_note, time

	global_options.key = Key (0, 0, 0)
	time = Time (4, 4)
	# urg LilyPond doesn't start at c4, but
	# remembers from previous tracks!
	# reference_note = Note (clocks_per_4, 4*12, 0)
	reference_note = Note (0, 4*12, 0)
	last_e = None
	chs = []
	ch = []

	for e in thread:
		if last_e and last_e[0] == e[0]:
			ch.append (e[1])
		else:
			if ch:
				chs.append ((last_e[0], ch))
				
			ch = [e[1]]
			
		last_e = e

	if ch:
		chs.append ((last_e[0], ch))
	t = 0
	last_t = 0
	last_bar_t = 0
	bar_count = 1
	
	lines = ['']
	for ch in chs: 
		t = ch[0]

		i = string.rfind (lines[-1], '\n') + 1
		if len (lines[-1][i:]) > LINE_BELL:
			lines.append ('')
			
		if t - last_t > 0:
			lines[-1] = lines[-1] + dump_skip (skip, t-last_t)
		elif t - last_t < 0:
			errorport.write ('BUG: time skew')

		(s, last_bar_t, bar_count) = dump_bar_line (last_bar_t,
							    t, bar_count)
		lines[-1] = lines[-1] + s
		
		lines[-1] = lines[-1] + dump_chord (ch[1])

		clocks = 0
		for i in ch[1]:
			if i.clocks > clocks:
				clocks = i.clocks
				
		last_t = t + clocks
		
		(s, last_bar_t, bar_count) = dump_bar_line (last_bar_t,
							    last_t, bar_count)
		lines[-1] = lines[-1] + s

	return string.join (lines, '\n  ') + '\n'

def track_name (i):
	return 'track%c' % (i + ord ('A'))

def channel_name (i):
	return 'channel%c' % (i + ord ('A'))

def dump_track (channels, n):
	s = '\n'
	track = track_name (n)
	clef = guess_clef (channels)

	for i in range (len (channels)):
		channel = channel_name (i)
		item = thread_first_item (channels[i])

		if item and item.__class__ == Note:
			skip = 's'
			s = s + '%s = ' % (track + channel)
			if not global_options.absolute_pitches:
				s = s + '\\relative c '
		elif item and item.__class__ == Text:
			skip = '" "'
			s = s + '%s = \\lyricmode ' % (track + channel)
		else:
			skip = '\\skip '
			s = s + '%s =  ' % (track + channel)
		s = s + '{\n'
		s = s + '  ' + dump_channel (channels[i][0], skip)
		s = s + '}\n\n'

	s = s + '%s = <<\n' % track

	if clef.type != 2:
		s = s + clef.dump () + '\n'

	for i in range (len (channels)):
		channel = channel_name (i)
		item = thread_first_item (channels[i])
		if item and item.__class__ == Text:
			s = s + '  \\context Lyrics = %s \\%s\n' % (channel,
								    track + channel)
		else:
			s = s + '  \\context Voice = %s \\%s\n' % (channel,
								   track + channel)
	s = s + '>>\n\n'
	return s

def thread_first_item (thread):
	for chord in thread:
		for event in chord:
			if (event[1].__class__ == Note 
                            or (event[1].__class__ == Text 
                                and event[1].type == midi.LYRIC)):
                                
                            return event[1]
	return None

def track_first_item (track):
	for thread in track:
		first = thread_first_item (thread)
                if first:
                        return first
        return None

def guess_clef (track):
	i = 0
	p = 0
	for thread in track:
		for chord in thread:
			for event in chord:
				if event[1].__class__ == Note:
					i = i + 1
					p = p + event[1].pitch
	if i and p / i <= 3*12:
		return Clef (0)
	elif i and p / i <= 5*12:
		return Clef (1)
	elif i and p / i >= 7*12:
		return Clef (3)
	else:
		return Clef (2)
	

def convert_midi (in_file, out_file):
	global clocks_per_1, clocks_per_4, key
	global start_quant_clocks
	global  duration_quant_clocks
	global allowed_tuplet_clocks

	str = open (in_file).read ()
	midi_dump = midi.parse (str)
        
	clocks_per_1 = midi_dump[0][1]
	clocks_per_4 = clocks_per_1 / 4
	
	if global_options.start_quant:
		start_quant_clocks = clocks_per_1 / global_options.start_quant

	if global_options.duration_quant:
		duration_quant_clocks = clocks_per_1 / global_options.duration_quant

	allowed_tuplet_clocks = []
	for (dur, num, den) in global_options.allowed_tuplets:
		allowed_tuplet_clocks.append (clocks_per_1 / den)

	tracks = []
	for t in midi_dump[1]:
		global_options.key = Key (0, 0, 0)
		tracks.append (split_track (t))

	tag = '%% Lily was here -- automatically converted by %s from %s' % ( program_name, in_file)

        
	s = ''
	s = tag + '\n\\version "2.7.18"\n\n'
	for i in range (len (tracks)):
		s = s + dump_track (tracks[i], i)

	s = s + '\n\\score {\n  <<\n'
        
        i = 0
	for t in tracks:
		track = track_name (i)
		item = track_first_item (t)
                
		if item and item.__class__ == Note:
			s = s + '    \\context Staff=%s \\%s\n' % (track, track)
		elif item and item.__class__ == Text:
			s = s + '    \\context Lyrics=%s \\%s\n' % (track, track)

                i += 1
	s = s + '  >>\n}\n'

 	progress (_ ("%s output to `%s'...") % ('LY', out_file))

	if out_file == '-':
		handle = sys.stdout
	else:
		handle = open (out_file, 'w')

	handle.write (s)
	handle.close ()


def get_option_parser ():
	p = ly.get_option_parser (usage='midi2ly [OPTIONS] FILE',
				  version="midi2ly (LilyPond) 2.8.8",
				  description=_('''Convert MIDI to LilyPond source.'''))

	p.add_option ('-a', '--absolute-pitches',
		      action='store_true',
		      help=_ ("print absolute pitches"))
	p.add_option ('-d', '--duration-quant',
		      metavar= _("DUR"),
		      help=_("quantise note durations on DUR"))
	p.add_option ('-e', '--explicit-durations',
		      action='store_true',
		      help=_ ("print explicit durations"))
	p.add_option('-k', '--key', help=_ ("set key: ALT=+sharps|-flats; MINOR=1"),
		     metavar=_ ("ALT[:MINOR]"),
		     default='0'),
	p.add_option ('-o', '--output', help=_("write output to FILE"),
		      metavar=_("FILE"),
		      action='store')
	p.add_option ('-s', '--start-quant',help= _ ("quantise note starts on DUR"),
		      metavar=_ ("DUR"))
	p.add_option ('-t', '--allow-tuplet',
		      metavar=_ ("DUR*NUM/DEN"),
		      action = "append",
		      dest="allowed_tuplets",
		      help=_ ("allow tuplet durations DUR*NUM/DEN"),
		      default=[])
	p.add_option ('-V', '--verbose', help=_("be verbose"),
		      action='store_true'
		      ),
	p.add_option ('-w', '--warranty', help=_("show warranty"),
		      action='store_true',
		      ),
	p.add_option ('-x', '--text-lyrics', help=_("treat every text as a lyric"),
		      action='store_true')

	p.add_option_group (_ ("example"),
			    description = r'''
    midi2ly --key=-2:1 --duration-quant=32 \
        --allow-tuplet=4*2/3 --allow-tuplet=2*4/3 foo.midi
''')
	
	p.add_option_group  ('bugs',
			     description='''Report bugs via http://post.gmane.org/post.php'''
			     '''?group=gmane.comp.gnu.lilypond.bugs\n''')
	
	return p



def do_options ():
	opt_parser = get_option_parser()
	(options, args) = opt_parser.parse_args ()

	if not args or args[0] == '-':
		opt_parser.print_help ()
		sys.stderr.write ('\n%s: %s %s\n' % (program_name, _ ("error: "),
						     _ ("no files specified on command line.")))
		sys.exit (2)

	if options.duration_quant:
		options.duration_quant = int (options.duration_quant)

	if options.warranty:
		warranty ()
		sys.exit (0)
	if 1:
		(alterations, minor) = map (int, string.split (options.key + ':0', ':'))[0:2]
 		sharps = 0
 		flats = 0
 		if alterations >= 0:
 			sharps = alterations
 		else:
 			flats = - alterations

		options.key = Key (sharps, flats, minor)

		
	if options.start_quant:
		options.start_quant = int (options.start_quant)
		
	options.allowed_tuplets = [map (int, a.replace ('/','*').split ('*'))
				for a in options.allowed_tuplets]
	
	global global_options
	global_options = options

	return args

def main():
	files = do_options()

	for f in files:
		g = f
		g = strip_extension (g, '.midi')
		g = strip_extension (g, '.mid')
		g = strip_extension (g, '.MID')
		(outdir, outbase) = ('','')

		if not output_name:
			outdir = '.'
			outbase = os.path.basename (g)
			o = os.path.join (outdir, outbase + '-midi.ly')
		elif output_name[-1] == os.sep:
			outdir = output_name
			outbase = os.path.basename (g)
			os.path.join (outdir, outbase + '-gen.ly')
		else:
			o = output_name
			(outdir, outbase) = os.path.split (o)

		if outdir != '.' and outdir != '':
			try:
				os.mkdir (outdir, 0777)
			except OSError:
				pass

		convert_midi (f, o)
if __name__ == '__main__':
	main()
