# -*- coding: utf-8 -*-*

import math
import os.path
import subprocess

document = []
footnoteIndex = 1
bibliographies = []
toc = False

def newPage():
	''' End the current page.
    '''
    
	global document
	
	document.append('\\newpage')

def pageBreak():
	''' Same as newPage, except it is more a friendly request : it may or may not end the page.
	'''
	
	global document
	
	document.append('\\pagebreak')
	
def rawText (text):
	''' Add raw text to the document.
	
	:param text: text to add
	'''
	
	global document
	
	document.append(text)
	
def paragraph (text):
	''' Add a paragraph in the document (a section of text separate by blank lines)
	
	:param text: paragraph text to add
	'''
	
	newLine()
	rawText(text)
	newLine()
	
def header (text, level=1, identifier=''):
	''' Add a header in the document.

	:param text: header text
	:param level: hierarchical level (1 is the higher)
	:param identifier: a specific identifier can be added in order to referenced it in the document (see Reference section). 
	Pandoc generate automatic based on the header text (See http://pandoc.org/MANUAL.html#header-identifiers)
	'''
	
	global document
	 
	header = '\n' + '#' * level + ' ' + text
	
	if identifier != '':
		header = header + ' ' + '{' + identifier + '}'
	
	#~ header += '\n'
	
	document.append(header)
	
def quoteBlock (texts, quoteChar='>'):
	''' Add a block quotation in the document by using the email convention.
	
	:param texts: hierarchical list of text representing the quote
	:param quoteChar: quote character
	
	>>> quoteBlock(['text1', ['text2', ['text3'], 'text4'], 'text5'])
	'''
	
	global document
	## ['text1', ['text2', ['text3'], 'text4'], 'text5']
	## > text1
	## > > text2
	## > > > text3
	## > > text4
	## > text5
	
	for text in texts:
		if type (text) is str:
			quote = quoteChar + ' ' + text + '\n'
			document.append(quote)
		elif type (text) is list :
			quoteBlock (text, quoteChar + ' >')
	
def codeBlock (text):
	''' Add a block of verbatim code to the document.
	
	:param text: code text, can be a string or a list which each element will be a line
	'''
	
	global document
	
	if type (text) is str:
		textitems = text.split('\n')
	elif type (text) is list:
		textitems = text
	
	code  = ''
	for textitem in textitems:
		code  = code + ' ' * 4 + textitem + '\n'
	
	document.append(code)
	
def codeBlockFenced (text, attributes=''):
	''' Add a block of verbatim code to the document. Fenced are added before and after the block of code. This form of code block is useful if the user wants to add attributes to it.
	
	:param text: code text
	:param attributes: attributes to add the code block
	'''
	
	global document
	
	fenced = '~' * 3
	
	code  = fenced
	if attributes != '':
		code = code + attributes 
		
	code = code + '\n' + text 
	
	## if there is no newline at the end of the text, add one
	if text[len(text)-1] != '\n':
		code = code + '\n'
	
	code = code + fenced
	
	document.append(code)

def lineBlock (text):
	''' Add a block of line to the document. 
	
	:param text: can be a string containing multiple lines ('\n' is the line separator) or a list of lines
	
	>>> lineBlock ('line 1 \nline 2 \nline 3')
	>>> lineBlock (['line 1', 'line 2', 'line 3'])
	'''
	
	global document
	
	if type (text) is str:
		textitems = text.split('\n')
	elif type (text) is list:
		textitems = text
	
	lines = ''
	for textitem in textitems:
		lines  = lines + '| ' + textitem + '\n'
	
	document.append(lines)
	
def listBlock (texts, loose=False):
	''' Add a list to the document. 
	
	:param texts: hierarchical list of text (3 levels maximum)
	:param loose: The loose option can be set to True to have a loose list in which each items are separated by spaces

	>>> listBlock ([a, [a, [a, b], b, c], b, c])
	'''
	
	global document
	
	## loose list or not
	if loose == True:
		cr = '\n' * 2
	else:
		cr = '\n'
	
	## format the text list. 3 level are available : [a, [a, [a, b], b, c], b, c]
	## * a
	##    + a
	##        - a
	##        - b
	##    + b
	##    + c
	## * b
	## * c
	textList = ''
	for texts1 in texts:
		if type (texts1) is str:
			textList = textList + '* ' + texts1 + cr
		elif type (texts1) is list:
			for texts2 in texts1:
				if type (texts2) is str:
					textList = textList + ' ' * 4 + '+ ' + texts2 + cr
				elif type (texts2) is list:
					for texts3 in texts2:
						if type (texts3) is str:
							textList = textList + ' ' * 8 + '- ' + texts3 + cr
	
	newLine()
	document.append(textList)
	
def orderedlistBlock (texts):
	''' Add an ordered list to the document. 
	
	:param texts: list of text element

	>>> orderedlistBlock(['ab', 'bc', 'cd'])
	'''
	
	global document
	
	textList = ''
	index = 1
	for text in texts:
		if type (text) is str:
			textList = textList + str(index) + '. ' + text + '\n'
			index = index + 1
	
	document.append(textList)

def newDocument(title = '', authors = [], date = ''):
	''' First library command to execute in the python script in order to initialize a pandoc document. 
	
	:param title: title of the document
	:param authors: list of authors of the document
	:param date: date of the document
	
	>>> newDocument('title\nof the document', ['author1', 'author2'], '25 june\n2017')
	'''
	
	global document
	 
	document = []
	
	if title != '':
		titleItems = title.split('\n')
		
		leads = '% '
		for items in titleItems:
			 document.append(leads + items)
			 leads = '  '
	else:
		if (authors != []) or (date != ''):
			document.append('%')

	if authors != []:
		tmp = ';'.join(authors)
		document.append('% ' + tmp)
	else:
		if date != '':
			document.append('%')
		
	if date != '':
		dateItems = date.split('\n')
		date = ' '.join(dateItems) 
		
		document.append('% ' + date)
	
def newLine ():
	''' Add a blank line to the document.
	'''
	
	global document
	
	document.append('')
	
def horizontalRule (char='-', number=10):
	''' Add an horizontal rule to the document. 
	
	:param char: character use for the rule among '-' (default), '_' or '*'
	:param number: number of char in the rule. Shall not be lower than 3
	
	>>> horizontalRule ()
	>>> horizontalRule ('*', 4)
	>>> horizontalRule ('_', 20)
	'''
	
	global document

	if ((char == '-') or (char == '_') or (char == '*')) and (number >= 3): 
		horiRule = '\n' + char * number
	
	document.append(horiRule)

## tableType can be equal to '' for simple and multiline table, 'grid' for grid table and 'pipe' for pipe table
def table (tableList, caption='', colSep=' ', tableType=''):
	''' Add a table to the document. 
	
	:param tableList: The table is given in a 2 dimensions list : each row of the list is a row of the table. The first one is the header and the header description. Each element of the header list is a list containing 3 data : the text header, the alignment and the size of the column (this last information can be omitted).
	:param caption: caption of the table
	:param colSep:
	:param tableType: table type : '' for simple and multiline table, 'grid' for grid table and 'pipe' for pipe table.
	
	>>> table ([['tt1', 'right', 10],['title2', 'left', 1],['t3', 'center', 10], ['t4', 'default', 40]], \
				['12', '12', '123', '12'], \
				['123', '123', '1234', '1234'], \
				['1', '1', '1', '1'] \
				])
	'''
	
	global document
	
	tableHeaders = tableList[0]
	
	maxLen = [0] * len(tableHeaders)
	sizelinePerCol = [[] for _ in tableHeaders]
	
	## the table list where header data (position, col size, ...) has been removed
	header = False
	tableList2 = []
	positions = [''] * len(tableHeaders)
	for i, headerData in enumerate(tableHeaders):
		## purge the headers from data except for the text
		headerText = headerData[0]
		if (tableType == 'pipe') and (headerText == ''):
			 headerText = ' '
		if len(headerText) > 0:
			header = True
			try:
				tableList2[0].append(headerText)
			except IndexError:
				tableList2.append([headerText])
		
		position = headerData[1]
		positions[i] = position
		## check if a size has been given by the user
		try:
			headerSize = headerData[2]
			if (position == 'right') or (position == 'left'):
				headerSize -= 2
			elif position == 'center':
				headerSize -= 4
			else:
				headerSize = 0
		except IndexError:
			headerSize = 0
			
		## initialize the list with user column size
		sizelinePerCol[i].append(headerSize)
	
	## add the rest of table list
	tableList2 += tableList[1:]

	## compute the number of rows of the final table and check if it is a multi line table
	nbRows = 0
	multiLine = False
	for j, row in enumerate(tableList2):
		numberOfRow = []
		for i, value in enumerate(row):
			textItems = value.split('\n')
			
			if tableType == 'pipe':
				tmp = ' '.join(textItems) 
				textItems = [tmp]

			if len(textItems) > 1:
				 multiLine = True

			for textItem in textItems: 
				sizelinePerCol[i].append(len(textItem))
				
			numberOfRow.append(len(textItems))
				
		nbRows += max(numberOfRow)
		
	## compute the max text lenght per column
	space = ' '
	headerLine = ''
	rowLine = ''
	if (tableType == '') and (multiLine == True):
		rowLine = '\n'
		
	for i, headerData in enumerate(tableHeaders):
		maxLen[i] = max(sizelinePerCol[i])
		 
		headerText = headerData[0]
		if tableType != 'pipe':
			textItems = headerText.split('\n')
			textLen = len(textItems[0])
		else:
			textLen = len(headerText)
			
		## compute header line and rowline if necessary
		position = positions[i]
		if tableType == '':
			if position == 'right':
				headerLine += '-' * (maxLen[i] + 2)
			elif position == 'left':
				headerLine += '-' * (maxLen[i] + 2)
			elif position == 'center':
				shift = int(round((maxLen[i] - textLen + 4) / 2))
					
				headerLine += '-' * (textLen + 2 * shift)
			else:
				if header == True:
					dashLen = textLen
				else: # no header
					dashLen = maxLen[i]
					
				headerLine += '-' * dashLen
				if (i < len(tableHeaders) - 1) and (header == True): ## when text in row of a default alignement header is greater than the header size 
					headerLine += space * (maxLen[i] - textLen)
				
			## add th column separator to the dashed line
			if i < len(tableHeaders) - 1:
				headerLine += colSep
		elif tableType == 'grid':
			if header == False:
				headerDash = '-'
			else:
				headerDash = '='

			if position == 'right':
				headerLine += '+' + headerDash * (maxLen[i] + 1) + ':'
			elif position == 'left':
				headerLine += '+' + ':' + headerDash * (maxLen[i] + 1)
			elif position == 'center':
				headerLine += '+' + ':' + headerDash * maxLen[i] + ':'
			else:
				headerLine += '+' + headerDash * (maxLen[i] + 2)
			
			rowLine += '+' + '-' * (maxLen[i] + 2)
			
			if (i == len(tableHeaders) - 1):
				headerLine += '+'
				rowLine += '+'
		elif tableType == 'pipe':
			headerDash = '-'
			
			if position == 'right':
				headerLine += '|' + headerDash * (maxLen[i] + 1) + ':'
			elif position == 'left':
				headerLine += '|' + ':' + headerDash * (maxLen[i] + 1)
			elif position == 'center':
				headerLine += '|' + ':' + headerDash * maxLen[i] + ':'
			else:
				headerLine += '|' + headerDash * (maxLen[i] + 2)
			
			if (i == len(tableHeaders) - 1):
				headerLine += '|'

	## compute the table top and bottom line 
	topTableLine = ''
	bottomTableLine = ""
	if tableType == '':
		if header == True:
			if multiLine == True:
				bottomTableLine = '-' * len(headerLine)
				topTableLine = bottomTableLine + '\n'
		else:
			bottomTableLine = headerLine
			topTableLine = bottomTableLine + '\n' 
	elif tableType == 'grid':
		if header == True:
			bottomTableLine = rowLine
			topTableLine = bottomTableLine + '\n'
		else:
			bottomTableLine = rowLine
			topTableLine = headerLine + '\n'

	## transform the tablelist2 multi line into a tablelist3 monoline
	tableList3 = [[''] * len(tableHeaders) for _ in range(0, nbRows)]
	nextRowIndex = 0
	headerIndex = 0
	rowIndexes = []
	for i, row in enumerate(tableList2):
		kMax = 0
		for j, texts in enumerate(row):
			textItems = texts.split('\n')
			
			if tableType == 'pipe':
				tmp = ' '.join(textItems) 
				textItems = [tmp]
 
			#~ print 'textItems', textItems
			for k, textItem in enumerate(textItems):
				tableList3[nextRowIndex+k][j] = textItem
				kMax = max(kMax, k)
				if (header == True) and (i == 0):
					headerIndex = kMax
			
		nextRowIndex += kMax + 1
		
		## compute the row indexes
		if ((i != 0) or (header == False)) and (i != len(tableList2)-1):
			rowIndexes.append(nextRowIndex)

	table = ''
	
	## finally write the the table
	for i, row in enumerate(tableList3):
		## add the row line if necessary
		if (i in rowIndexes) and (rowLine != ''):
			table += rowLine + '\n'
			
		for j, text in enumerate(row):
			#~ print j, text 
			textLen = len(text)
			
			position = positions[j]
			colLen = maxLen[j]
			if tableType == '':
				if position == 'right':
					table += space * (colLen - textLen + 2) + text
				elif position == 'left':
					table += text + space * (colLen - textLen + 2)
				elif position == 'center':
					shift = int(round((colLen - textLen + 4) / 2))
					table += space * shift + text + space * shift + space * int(textLen%2)
				else:
					table += text + space * (colLen - textLen)

				table += colSep
			elif tableType == 'grid':
				table += '| ' + text + space * (colLen - textLen) + ' '
				
				if (j == len(tableHeaders) - 1):
					table += '|'
			elif tableType == 'pipe':
				table += '| ' + text + space * (colLen - textLen) + ' '
				
				if (j == len(tableHeaders) - 1):
					table += '|'
				
		## write the header line
		if (header == True) and (i == headerIndex):
			table += '\n' + headerLine
					
		table = table + '\n'

	## write the table top and bottom line
	table = '\n' + topTableLine + table + bottomTableLine
		
	table += '\n'
		
	## write the table caption
	if caption != '':
		table += '\nTable: ' + caption + '\n'

	document.append(table)
	
def italic(text):
	''' Return an italic text (pandoc emphase).
	
	param text: text to put in italic

	>>> rawText('this is an ' + italic('italic') + ' emphase')
	'''
	
	emphasChar = '*'
	text = emphasChar + text.strip(' ') + emphasChar
	
	return text
	
def bold(text):
	''' Return a bold text (pandoc strong emphase).
	
	param text: text to put in bold

	>>> rawText('this is a ' + bold('bold') + ' emphase')
	'''
	
	emphasChar = '**'
	text = emphasChar + text.strip(' ') + emphasChar
	
	return text
	
def strikeout (text):
	''' Return a strikeout text.

	param text: text to strikeout
	
	>>> rawText('this is a ' + strikeout('strike out')) 
	'''
	
	text = '~~' + text.strip(' ') + '~~'
	
	return text
	
def power(text):
	''' Return a power text.

	param text: text which power apply
	
	>>> rawText('power : 2' + power('10'))
	'''
	
	text = '^' + text.strip(' ') + '^'
	
	return text

def indice(text):
	''' Return an indice text.
	
	param text: text which indice apply
	
	>>> rawText('indice : H' + indice('2') + '0')
	'''
	
	text = '~' + text.strip(' ') + '~'
	
	return text

def verbatim(text, attributes = ''):
	''' Return a verbatim text.
	
	param text: text which verbatim apply
	param attributes: attributes to apply to the verbatim text
	
	>>> rawText('verbatim text : ' + verbatim('this is a verbatim text') + '\n')
	'''
	
	verbatimChar = '`'
	if text.find(verbatimChar) != -1:
		verbatimChar = ' `` '
		
	text = verbatimChar + text.strip(' ') + verbatimChar
	
	if attributes != '':
		text += '{' + attributes+ '}'
	
	return text

def smallCaps(text):
	''' Return a smallcaps text. Small capitals (usually abbreviated small caps) are uppercase (capital) characters set at the same height and weight as surrounding lowercase (small) letters.

	param text: text to put in small capitals
	
	>>> rawText('small caps text : ' + smallCaps('this is a smallcaps text'))
	'''
	
	text = '[' + text + ']{style="font-variant:small-caps;"}'
	
	return text
	
def math(text):
	''' Return a math formula. The formula shall be latex math formula.

	param text: latext math formula
	
	>>> rawText('math formula : ' + math('\\sqrt{\\frac{x^2}{3}}'))
	'''
	
	text = '$' + text.strip(' ') + '$'
	
	return text

def email(email, text = ''):
	''' Return an email link (<http://google.com>) or if the text is specified an inline email link ([inline link](http://fsf.org "click here for a good time!")).

	param email: email text
	param text: for inline link, text on which the email apply
	
	>>> email('sam@green.eggs.ham')
	>>> email('sam@green.eggs.ham', 'Write me !')
	'''
	
	if text == '':
		email = '<' + email.strip(' ') + '>'
	else:
		email = '[' + text + '](mailto:' + email + ')'
		
	return email

def url(url, text = '', title = ''):
	''' Return an url link or if the text is specified an inline url link.
	
	param url: url text
	param text: for inline link, text on which the url apply
	param title: title associated to the url
	
	>>> url('http://google.com')
	>>> url('http://fsf.org', 'inline link', 'click here for a good time!')
	'''
	
	if text == '':
		url = '<' + url.strip(' ') + '>'
	else:
		url = '[' + text + '](' + url
		if title != '':
			url += ' "' + title + '"'
			
		url +=')'
		
	return url

def reference(ref, text = ''):
	''' Return a reference text.
	
	Reference link : [inline link][Foo], ref is a defined reference : [Foo]: /bar/baz
	Implicit reference link : See [my website][], no url, the text is the reference : [my website]: http://foo.bar.baz
	Internal links : use header identifiers to reference the document structure : See the [Introduction](#introduction) or See the [Introduction] with the following reference [Introduction]: #introduction 
	
	param ref: identifier of the reference. Can be a header reference or a reference defined thanks to the definedReference command.
	param text: if specified, an inline link is done on the text.
	
	>>> reference('#introduction', 'Introduction')
	>>> reference('My Website')
	'''
	
	if ref.find('#') != -1: ## internal links (header)
		if text != '':
			reference = '[' + text + '](' + ref + ')'
		else:
			reference = '[' + ref + ']'
	else:
		if text != '':
			reference = '[' + text + '][' + ref + ']'
		else:
			#~ reference = '[' + ref + '][]'
			reference = '[' + ref + ']' ## shortcut_reference_links
		
	return reference

def definedReference(ref, text, title='', attributes=''):
	''' Add a reference definition to the document.
	
	Examples of use:
	
	* inline link:
	Here is [my link][FOO]
	
	[Foo]: /bar/baz
	
	* implicit reference can be done :
	See [my website][].
	
	[my website]: http://foo.bar.baz

	* image reference :
	[movie reel]: movie.gif
	
	param ref: the real reference : an url, an image filename, … 
	param text: the identifier used by the reference command 
	param title: title associated to the reference definition
	param attributes: attributes that can be applied to the definition
	
	>>> definedReference('http://fsf.org', 'FSF', 'click here for a good time!')
	>>> definedReference('http://truc.org', 'My Website')
	>>> definedReference('#introduction', 'Introduction')
	>>> definedReference('BladeRunner.gif', 'Blade Runner', 'title', 'width=10cm height=20px')
	'''
	
	global document
	
	reference = '[' + text + ']: ' + ref
	
	if title != '':
		reference += ' "' + title + '"'
	
	if attributes != '':
		reference += ' {' + attributes + '}'
	
	document.append(reference)

def image (ref, text = '', title = '', width = '', height = ''):
	''' Return an image link text. 
	
	param ref: can be a filename or a predefined reference (see the  definedReference command). 
	param text: ifspecified, the link will be made on it. 
	param title: text which will be attach to the image (popup text depending of the output format of the pandoc convertion). 
	param width: image width. Can be given with unit (px, cm, mm, in, inch and %). There must not be any spaces between the number and the unit.
	param height: image height. Can be given with unit (px, cm, mm, in, inch and %). There must not be any spaces between the number and the unit.
	
	>>> imageRef = image('la_lune.jpg', width = '50%')
	>>> image('Blade Runner')
	'''
	
	if ref.find('.') != -1: ## image filename
	#~ if text != '':
		image = '![' + text + '](' + ref
		if title != '':
			image += ' "' + title + '"'
		
		image += ')'
			
	else:
		image = '![' + ref + ']'
		
	if (width != '') or (height != ''):
		image += '{'
		if width != '':
			image += ' width=' + width
		if height != '':
			image += ' height=' + height
		
		image += ' }'
		
	return image

def spans(text, attributes):
	''' Return a span text. A span allow the user to give attributes to a text.
	
	param text: text to span
	param attributes: attributes to apply on the text
	'''
	
	spans = '[' + text + ']{' + attributes + '}'
	
	return spans

def footnote(ident = '', text = ''):
	''' Return a footnote text. 
	
	Two forms of pandoc footnote exists : a text is given, in the case of an inline footnote (the note is located on the current text). 
	In the other hand, if no text is given, the text return will be a footnote identifier. 
	It will be automatically compute or assign through the ident argument.
	
	param ident: identifier of he footnote
	param text: text of the footnote
	'''
	
	global footnoteIndex
	
	if ident != '':
		footnote = '[^' + ident + ']'
	else:
		if text == '':
			footnote = '[^' + str(footnoteIndex) + ']'
			footnoteIndex += 1
		else: ## inline_notes
			footnote = '^[' + text + ']'
			
	return footnote
	
def definedFootnote(ident, text, indent = '\n\n'):
	''' Add a footnote definition to the document. 
	
	In the case of footnote using identifier, this command is use to define it. 
	
	param ident: identifier of the footnote
	param text: text associated to the footnote
	param indent: used in the case of text which contains multiple paragraph
	'''
	
	global document
	
	reference = '[^' + ident + ']: '
	
	## find if there is several paragraph on the text footnote
	textItems = text.split(indent)
	
	for textItem in textItems:
		reference += textItem
		reference += ident + '\t'
	 
	document.append(reference)

def citations(*args):
	''' Return a citation text. 
	
	param args: list of identifier follow by, optionally, a locator.
	'''
	
	cite = '['
	
	newKey = False
	for a in args:
		if a.find('@') != -1:
			if newKey == False:
				cite += a
				newKey = True
			else:
				cite += ';' + a
				newKey = False
		else:
			cite += ', ' + a
	
	cite += ']'
	
	return cite

#~ class BiblioGraphyError(Exception):
	#~ def __init__(self, value):
		#~ self.value = value
	#~ def __str__(self):
		#~ return repr(self.value)

def addBibliography(filename):
	''' Add a bibliography file.
	
	param filename: bibliography filename
	'''
	
	global bibliographies
	
	if os.path.isfile(filename) == True: 
		bibliographies.append(filename)
	else:
		raise NameError('bibliography file ' + filename + ' does not exists')
		#~ raise BiblioGraphyError(filename + ' does not exists')

def addTOC ():
	''' If the user wants to add a table of content in his document, this command has to be placed in the script before the convert command.
	'''
	
	global toc
	
	toc = True
	
def removeFormatting(text):
	''' Return a text without all its formatting. A backslash is added to the following character : *, _, ~, ^, {, }, $, >, <, ", \. 
	This function can be used if, for example, a text from external sources (i.e. the taste library) contains characters which can be interpreted by pandoc.
	
	param text: text on which the pandoc formatting has to be removed
	'''
	charsToReplace = ['*', '_', '~','^', '{', '}', '$', '>', '<', '"', '\\']
	for charToReplace in charsToReplace:
		replaceStr = '\\' + charToReplace
		text = text.replace(charToReplace, replaceStr)
		
	return text 

def finalizeDocument():
	''' Commands which finalizes the document. It shall be called when no more element has to be added to the document. 
	'''
	
	global bibliographies
	
	if bibliographies != []:
		header('References')
		
def printDocument (printLine=False):
	''' Display the document in its current state.
	
	param printLine: boolean for printing the line number
	'''
	
	global document
	
	index = 1
	for item in document:
		if printLine == False:
			print item
		else:
			print 'line ' + str(index) + item
			index = index + 1

def serialize (filename):
	''' Serialize in a file the content of the document.
	
	param filename: name of the file where the document will be serialize
	'''
	
	global document
	
	fo = open(filename, 'w')
	
	for item in document:
		fo.write(item + '\n')
	
	fo.close()
	
	return 0
	
def convert(destination, toFormat, source = ''):
	''' Call the pandoc command in order to convert the source document into a specified format and serialize it to the destination filename. 

	Only pdf output has been tested, the format has to be latex and the extension of the file has to be pdf.
	
	param destination: name of the destination file (i.e. test.pdf)
	param toFormat: format of the conversion (i.e. latex)
	param source: source file. If no source is given, the current document is serialized and converted
	
	>>> convert('test.pdf', 'latex')
	'''
	
	global toc
	
	generate = False
	if source != '':
		if os.path.isfile(source) != True:
			 generate = True
	else:
		generate = True
		
	if generate == True:
		source = 'tmp.md'
		serialize (source)
	
	command = ['pandoc', '-fmarkdown', '-t' + toFormat, '-o' + destination, '--smart']
	if toc == True:
		command.append('--toc')
	
	command.append(source)
	
	try:
		subprocess.call(command)
	except :
		print 'convertion impossible : pandoc is not found'

def svgToPdf (source):
    ''' Call the inkscape command in order to convert the source svg file into pdf format. 

	param source: svg source file. The destination pdf filename is generated based on the source filename.
	
	>>> convert('test.pdf', 'latex')
	'''
    
	destination = ''
	convert = False
	if source != '':
		if os.path.isfile(source) == True:
			 convert = True

	if convert == True:
		## get the destination filename base on the source filename
		destination = os.path.splitext(source)[0] ## get the filename without the extension
		destination += '.pdf' ## add the extension
		
		## inkscape -D -z --file=ex.svg --export-pdf=ex.pdf
		command = ['inkscape', '-D', '-z', '--file=' + source, '--export-pdf=' + destination]

		try:
			subprocess.call(command)
		except :
			print 'pdf convertion impossible'

	return destination