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0
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1 #!/usr/bin/env python
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2
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3 """
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4 Runs BWA on single-end or paired-end data.
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5 Produces a SAM file containing the mappings.
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6 Works with BWA version 0.5.9.
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7
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8 usage: bwa_wrapper.py [options]
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9
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10 See below for options
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11 """
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12
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13 import optparse, os, shutil, subprocess, sys, tempfile
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14
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15 def stop_err( msg ):
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16 sys.stderr.write( '%s\n' % msg )
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17 sys.exit()
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18
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19 def check_is_double_encoded( fastq ):
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20 # check that first read is bases, not one base followed by numbers
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21 bases = [ 'A', 'C', 'G', 'T', 'a', 'c', 'g', 't', 'N' ]
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22 nums = [ '0', '1', '2', '3' ]
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23 for line in file( fastq, 'rb'):
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24 if not line.strip() or line.startswith( '@' ):
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25 continue
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26 if len( [ b for b in line.strip() if b in nums ] ) > 0:
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27 return False
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28 elif line.strip()[0] in bases and len( [ b for b in line.strip() if b in bases ] ) == len( line.strip() ):
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29 return True
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30 else:
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31 raise Exception, 'First line in first read does not appear to be a valid FASTQ read in either base-space or color-space'
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32 raise Exception, 'There is no non-comment and non-blank line in your FASTQ file'
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33
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34 def __main__():
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35 #Parse Command Line
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36 parser = optparse.OptionParser()
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37 parser.add_option( '-t', '--threads', dest='threads', help='The number of threads to use' )
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38 parser.add_option( '-c', '--color-space', dest='color_space', action='store_true', help='If the input files are SOLiD format' )
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39 parser.add_option( '-r', '--ref', dest='ref', help='The reference genome to use or index' )
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40 parser.add_option( '-f', '--input1', dest='fastq', help='The (forward) fastq file to use for the mapping' )
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41 parser.add_option( '-F', '--input2', dest='rfastq', help='The reverse fastq file to use for mapping if paired-end data' )
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42 parser.add_option( '-u', '--output', dest='output', help='The file to save the output (SAM format)' )
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43 parser.add_option( '-g', '--genAlignType', dest='genAlignType', help='The type of pairing (single or paired)' )
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44 parser.add_option( '-p', '--params', dest='params', help='Parameter setting to use (pre_set or full)' )
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45 parser.add_option( '-s', '--fileSource', dest='fileSource', help='Whether to use a previously indexed reference sequence or one form history (indexed or history)' )
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46 parser.add_option( '-n', '--maxEditDist', dest='maxEditDist', help='Maximum edit distance if integer' )
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47 parser.add_option( '-m', '--fracMissingAligns', dest='fracMissingAligns', help='Fraction of missing alignments given 2% uniform base error rate if fraction' )
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48 parser.add_option( '-o', '--maxGapOpens', dest='maxGapOpens', help='Maximum number of gap opens' )
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49 parser.add_option( '-e', '--maxGapExtens', dest='maxGapExtens', help='Maximum number of gap extensions' )
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50 parser.add_option( '-d', '--disallowLongDel', dest='disallowLongDel', help='Disallow a long deletion within specified bps' )
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51 parser.add_option( '-i', '--disallowIndel', dest='disallowIndel', help='Disallow indel within specified bps' )
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52 parser.add_option( '-l', '--seed', dest='seed', help='Take the first specified subsequences' )
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53 parser.add_option( '-k', '--maxEditDistSeed', dest='maxEditDistSeed', help='Maximum edit distance to the seed' )
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54 parser.add_option( '-M', '--mismatchPenalty', dest='mismatchPenalty', help='Mismatch penalty' )
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55 parser.add_option( '-O', '--gapOpenPenalty', dest='gapOpenPenalty', help='Gap open penalty' )
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56 parser.add_option( '-E', '--gapExtensPenalty', dest='gapExtensPenalty', help='Gap extension penalty' )
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57 parser.add_option( '-R', '--suboptAlign', dest='suboptAlign', default=None, help='Proceed with suboptimal alignments even if the top hit is a repeat' )
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58 parser.add_option( '-N', '--noIterSearch', dest='noIterSearch', help='Disable iterative search' )
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59 parser.add_option( '-T', '--outputTopN', dest='outputTopN', help='Maximum number of alignments to output in the XA tag for reads paired properly' )
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60 parser.add_option( '', '--outputTopNDisc', dest='outputTopNDisc', help='Maximum number of alignments to output in the XA tag for disconcordant read pairs (excluding singletons)' )
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61 parser.add_option( '-S', '--maxInsertSize', dest='maxInsertSize', help='Maximum insert size for a read pair to be considered mapped good' )
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62 parser.add_option( '-P', '--maxOccurPairing', dest='maxOccurPairing', help='Maximum occurrences of a read for pairings' )
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63 parser.add_option( '', '--rgid', dest='rgid', help='Read group identifier' )
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64 parser.add_option( '', '--rgcn', dest='rgcn', help='Sequencing center that produced the read' )
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65 parser.add_option( '', '--rgds', dest='rgds', help='Description' )
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66 parser.add_option( '', '--rgdt', dest='rgdt', help='Date that run was produced (ISO8601 format date or date/time, like YYYY-MM-DD)' )
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67 parser.add_option( '', '--rgfo', dest='rgfo', help='Flow order' )
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68 parser.add_option( '', '--rgks', dest='rgks', help='The array of nucleotide bases that correspond to the key sequence of each read' )
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69 parser.add_option( '', '--rglb', dest='rglb', help='Library name' )
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70 parser.add_option( '', '--rgpg', dest='rgpg', help='Programs used for processing the read group' )
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71 parser.add_option( '', '--rgpi', dest='rgpi', help='Predicted median insert size' )
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72 parser.add_option( '', '--rgpl', dest='rgpl', choices=[ 'CAPILLARY', 'LS454', 'ILLUMINA', 'SOLID', 'HELICOS', 'IONTORRENT' and 'PACBIO' ], help='Platform/technology used to produce the reads' )
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73 parser.add_option( '', '--rgpu', dest='rgpu', help='Platform unit (e.g. flowcell-barcode.lane for Illumina or slide for SOLiD)' )
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74 parser.add_option( '', '--rgsm', dest='rgsm', help='Sample' )
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75 parser.add_option( '-D', '--dbkey', dest='dbkey', help='Dbkey for reference genome' )
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76 parser.add_option( '-X', '--do_not_build_index', dest='do_not_build_index', action='store_true', help="Don't build index" )
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77 parser.add_option( '-H', '--suppressHeader', dest='suppressHeader', help='Suppress header' )
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78 parser.add_option( '-I', '--illumina1.3', dest='illumina13qual', help='Input FASTQ files have Illuina 1.3 quality scores' )
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79 (options, args) = parser.parse_args()
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80
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81 # output version # of tool
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82 try:
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83 tmp = tempfile.NamedTemporaryFile().name
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84 tmp_stdout = open( tmp, 'wb' )
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85 proc = subprocess.Popen( args='bwa 2>&1', shell=True, stdout=tmp_stdout )
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86 tmp_stdout.close()
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87 returncode = proc.wait()
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88 stdout = None
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89 for line in open( tmp_stdout.name, 'rb' ):
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90 if line.lower().find( 'version' ) >= 0:
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91 stdout = line.strip()
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92 break
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93 if stdout:
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94 sys.stdout.write( 'BWA %s\n' % stdout )
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95 else:
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96 raise Exception
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97 except:
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98 sys.stdout.write( 'Could not determine BWA version\n' )
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99
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100 # check for color space fastq that's not double-encoded and exit if appropriate
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101 if options.color_space:
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102 if not check_is_double_encoded( options.fastq ):
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103 stop_err( 'Your file must be double-encoded (it must be converted from "numbers" to "bases"). See the help section for details' )
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104 if options.genAlignType == 'paired':
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105 if not check_is_double_encoded( options.rfastq ):
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106 stop_err( 'Your reverse reads file must also be double-encoded (it must be converted from "numbers" to "bases"). See the help section for details' )
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107
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108 fastq = options.fastq
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109 if options.rfastq:
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110 rfastq = options.rfastq
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111
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112 # set color space variable
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113 if options.color_space:
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114 color_space = '-c'
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115 else:
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116 color_space = ''
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117
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118 # make temp directory for placement of indices
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119 tmp_index_dir = tempfile.mkdtemp()
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120 tmp_dir = tempfile.mkdtemp()
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121 # index if necessary
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122 if options.fileSource == 'history' and not options.do_not_build_index:
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123 ref_file = tempfile.NamedTemporaryFile( dir=tmp_index_dir )
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124 ref_file_name = ref_file.name
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125 ref_file.close()
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126 os.symlink( options.ref, ref_file_name )
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127 # determine which indexing algorithm to use, based on size
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128 try:
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129 size = os.stat( options.ref ).st_size
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130 if size <= 2**30:
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131 indexingAlg = 'is'
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132 else:
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133 indexingAlg = 'bwtsw'
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134 except:
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135 indexingAlg = 'is'
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136 indexing_cmds = '%s -a %s' % ( color_space, indexingAlg )
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137 cmd1 = 'bwa index %s %s' % ( indexing_cmds, ref_file_name )
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138 try:
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139 tmp = tempfile.NamedTemporaryFile( dir=tmp_index_dir ).name
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140 tmp_stderr = open( tmp, 'wb' )
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141 proc = subprocess.Popen( args=cmd1, shell=True, cwd=tmp_index_dir, stderr=tmp_stderr.fileno() )
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142 returncode = proc.wait()
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143 tmp_stderr.close()
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144 # get stderr, allowing for case where it's very large
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145 tmp_stderr = open( tmp, 'rb' )
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146 stderr = ''
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147 buffsize = 1048576
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148 try:
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149 while True:
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150 stderr += tmp_stderr.read( buffsize )
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151 if not stderr or len( stderr ) % buffsize != 0:
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152 break
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153 except OverflowError:
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154 pass
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155 tmp_stderr.close()
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156 if returncode != 0:
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157 raise Exception, stderr
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158 except Exception, e:
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159 # clean up temp dirs
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160 if os.path.exists( tmp_index_dir ):
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161 shutil.rmtree( tmp_index_dir )
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162 if os.path.exists( tmp_dir ):
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163 shutil.rmtree( tmp_dir )
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164 stop_err( 'Error indexing reference sequence. ' + str( e ) )
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165 else:
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166 ref_file_name = options.ref
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167 if options.illumina13qual:
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168 illumina_quals = "-I"
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169 else:
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170 illumina_quals = ""
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171
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172 # set up aligning and generate aligning command options
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173 if options.params == 'pre_set':
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174 aligning_cmds = '-t %s %s %s' % ( options.threads, color_space, illumina_quals )
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175 gen_alignment_cmds = ''
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176 else:
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177 if options.maxEditDist != '0':
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178 editDist = options.maxEditDist
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179 else:
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180 editDist = options.fracMissingAligns
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181 if options.seed != '-1':
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182 seed = '-l %s' % options.seed
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183 else:
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184 seed = ''
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185 if options.suboptAlign:
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186 suboptAlign = '-R "%s"' % ( options.suboptAlign )
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187 else:
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188 suboptAlign = ''
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189 if options.noIterSearch == 'true':
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190 noIterSearch = '-N'
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191 else:
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192 noIterSearch = ''
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193 aligning_cmds = '-n %s -o %s -e %s -d %s -i %s %s -k %s -t %s -M %s -O %s -E %s %s %s %s %s' % \
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194 ( editDist, options.maxGapOpens, options.maxGapExtens, options.disallowLongDel,
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195 options.disallowIndel, seed, options.maxEditDistSeed, options.threads,
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196 options.mismatchPenalty, options.gapOpenPenalty, options.gapExtensPenalty,
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197 suboptAlign, noIterSearch, color_space, illumina_quals )
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198 if options.genAlignType == 'paired':
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199 gen_alignment_cmds = '-a %s -o %s' % ( options.maxInsertSize, options.maxOccurPairing )
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200 if options.outputTopNDisc:
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201 gen_alignment_cmds += ' -N %s' % options.outputTopNDisc
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202 else:
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203 gen_alignment_cmds = ''
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204 if options.rgid:
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205 if not options.rglb or not options.rgpl or not options.rgsm:
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206 stop_err( 'If you want to specify read groups, you must include the ID, LB, PL, and SM tags.' )
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207 readGroup = '@RG\tID:%s\tLB:%s\tPL:%s\tSM:%s' % ( options.rgid, options.rglb, options.rgpl, options.rgsm )
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208 if options.rgcn:
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209 readGroup += '\tCN:%s' % options.rgcn
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210 if options.rgds:
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211 readGroup += '\tDS:%s' % options.rgds
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212 if options.rgdt:
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213 readGroup += '\tDT:%s' % options.rgdt
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214 if options.rgfo:
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215 readGroup += '\tFO:%s' % options.rgfo
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216 if options.rgks:
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217 readGroup += '\tKS:%s' % options.rgks
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218 if options.rgpg:
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219 readGroup += '\tPG:%s' % options.rgpg
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220 if options.rgpi:
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221 readGroup += '\tPI:%s' % options.rgpi
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222 if options.rgpu:
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223 readGroup += '\tPU:%s' % options.rgpu
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224 gen_alignment_cmds += ' -r "%s"' % readGroup
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225 if options.outputTopN:
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226 gen_alignment_cmds += ' -n %s' % options.outputTopN
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227 # set up output files
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228 tmp_align_out = tempfile.NamedTemporaryFile( dir=tmp_dir )
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229 tmp_align_out_name = tmp_align_out.name
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230 tmp_align_out.close()
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231 tmp_align_out2 = tempfile.NamedTemporaryFile( dir=tmp_dir )
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232 tmp_align_out2_name = tmp_align_out2.name
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233 tmp_align_out2.close()
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234 # prepare actual aligning and generate aligning commands
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235 cmd2 = 'bwa aln %s %s %s > %s' % ( aligning_cmds, ref_file_name, fastq, tmp_align_out_name )
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236 cmd2b = ''
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237 if options.genAlignType == 'paired':
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238 cmd2b = 'bwa aln %s %s %s > %s' % ( aligning_cmds, ref_file_name, rfastq, tmp_align_out2_name )
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239 cmd3 = 'bwa sampe %s %s %s %s %s %s >> %s' % ( gen_alignment_cmds, ref_file_name, tmp_align_out_name, tmp_align_out2_name, fastq, rfastq, options.output )
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240 else:
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241 cmd3 = 'bwa samse %s %s %s %s >> %s' % ( gen_alignment_cmds, ref_file_name, tmp_align_out_name, fastq, options.output )
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242 # perform alignments
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243 buffsize = 1048576
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244 try:
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245 # need to nest try-except in try-finally to handle 2.4
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246 try:
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247 # align
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248 try:
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249 tmp = tempfile.NamedTemporaryFile( dir=tmp_dir ).name
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250 tmp_stderr = open( tmp, 'wb' )
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251 proc = subprocess.Popen( args=cmd2, shell=True, cwd=tmp_dir, stderr=tmp_stderr.fileno() )
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252 returncode = proc.wait()
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253 tmp_stderr.close()
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254 # get stderr, allowing for case where it's very large
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255 tmp_stderr = open( tmp, 'rb' )
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256 stderr = ''
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257 try:
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258 while True:
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259 stderr += tmp_stderr.read( buffsize )
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260 if not stderr or len( stderr ) % buffsize != 0:
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261 break
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262 except OverflowError:
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263 pass
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264 tmp_stderr.close()
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265 if returncode != 0:
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266 raise Exception, stderr
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267 except Exception, e:
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268 raise Exception, 'Error aligning sequence. ' + str( e )
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269 # and again if paired data
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270 try:
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271 if cmd2b:
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272 tmp = tempfile.NamedTemporaryFile( dir=tmp_dir ).name
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273 tmp_stderr = open( tmp, 'wb' )
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274 proc = subprocess.Popen( args=cmd2b, shell=True, cwd=tmp_dir, stderr=tmp_stderr.fileno() )
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275 returncode = proc.wait()
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276 tmp_stderr.close()
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277 # get stderr, allowing for case where it's very large
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278 tmp_stderr = open( tmp, 'rb' )
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279 stderr = ''
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280 try:
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281 while True:
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282 stderr += tmp_stderr.read( buffsize )
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283 if not stderr or len( stderr ) % buffsize != 0:
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284 break
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285 except OverflowError:
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286 pass
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287 tmp_stderr.close()
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288 if returncode != 0:
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289 raise Exception, stderr
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290 except Exception, e:
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291 raise Exception, 'Error aligning second sequence. ' + str( e )
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292 # generate align
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293 try:
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294 tmp = tempfile.NamedTemporaryFile( dir=tmp_dir ).name
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295 tmp_stderr = open( tmp, 'wb' )
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296 proc = subprocess.Popen( args=cmd3, shell=True, cwd=tmp_dir, stderr=tmp_stderr.fileno() )
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297 returncode = proc.wait()
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298 tmp_stderr.close()
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299 # get stderr, allowing for case where it's very large
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300 tmp_stderr = open( tmp, 'rb' )
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301 stderr = ''
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302 try:
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303 while True:
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304 stderr += tmp_stderr.read( buffsize )
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305 if not stderr or len( stderr ) % buffsize != 0:
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306 break
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307 except OverflowError:
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308 pass
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309 tmp_stderr.close()
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310 if returncode != 0:
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311 raise Exception, stderr
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312 except Exception, e:
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313 raise Exception, 'Error generating alignments. ' + str( e )
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314 # remove header if necessary
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315 if options.suppressHeader == 'true':
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316 tmp_out = tempfile.NamedTemporaryFile( dir=tmp_dir)
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317 tmp_out_name = tmp_out.name
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318 tmp_out.close()
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319 try:
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320 shutil.move( options.output, tmp_out_name )
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321 except Exception, e:
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322 raise Exception, 'Error moving output file before removing headers. ' + str( e )
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323 fout = file( options.output, 'w' )
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324 for line in file( tmp_out.name, 'r' ):
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325 if not ( line.startswith( '@HD' ) or line.startswith( '@SQ' ) or line.startswith( '@RG' ) or line.startswith( '@PG' ) or line.startswith( '@CO' ) ):
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326 fout.write( line )
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327 fout.close()
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328 # check that there are results in the output file
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329 if os.path.getsize( options.output ) > 0:
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330 sys.stdout.write( 'BWA run on %s-end data' % options.genAlignType )
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331 else:
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332 raise Exception, 'The output file is empty. You may simply have no matches, or there may be an error with your input file or settings.'
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333 except Exception, e:
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334 stop_err( 'The alignment failed.\n' + str( e ) )
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335 finally:
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336 # clean up temp dir
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337 if os.path.exists( tmp_index_dir ):
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338 shutil.rmtree( tmp_index_dir )
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339 if os.path.exists( tmp_dir ):
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340 shutil.rmtree( tmp_dir )
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341
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342 if __name__=="__main__": __main__()
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