root/galaxy-central/tools/fastq/fastq_stats.py @ 3

#Dan Blankenberg
import sys
from galaxy_utils.sequence.fastq import fastqReader, fastqAggregator

VALID_NUCLEOTIDES = [ 'A', 'C', 'G', 'T', 'N' ]
VALID_COLOR_SPACE = map( str, range( 7 ) ) + [ '.' ]
SUMMARY_STAT_ORDER = ['read_count', 'min_score', 'max_score', 'sum_score', 'mean_score', 'q1', 'med_score', 'q3', 'iqr', 'left_whisker', 'right_whisker' ]

def main():
    input_filename = sys.argv[1]
    output_filename = sys.argv[2]
    input_type = sys.argv[3] or 'sanger'
    
    aggregator = fastqAggregator()
    num_reads = None
    fastq_read = None
    for num_reads, fastq_read in enumerate( fastqReader( open( input_filename ), format = input_type ) ):
        aggregator.consume_read( fastq_read )
    out = open( output_filename, 'wb' )
    valid_nucleotides = VALID_NUCLEOTIDES
    if fastq_read:
        if fastq_read.sequence_space == 'base':
            out.write( '#column\tcount\tmin\tmax\tsum\tmean\tQ1\tmed\tQ3\tIQR\tlW\trW\toutliers\tA_Count\tC_Count\tG_Count\tT_Count\tN_Count\tother_bases\tother_base_count\n' )
        else:
            out.write( '#column\tcount\tmin\tmax\tsum\tmean\tQ1\tmed\tQ3\tIQR\tlW\trW\toutliers\t0_Count\t1_Count\t2_Count\t3_Count\t4_Count\t5_Count\t6_Count\t._Count\tother_bases\tother_base_count\n' )
            valid_nucleotides = VALID_COLOR_SPACE
    for i in range( aggregator.get_max_read_length() ):
        column_stats = aggregator.get_summary_statistics_for_column( i )
        out.write( '%i\t' % ( i + 1 ) )
        out.write( '%s\t' * len( SUMMARY_STAT_ORDER ) % tuple( [ column_stats[ key ] for key in SUMMARY_STAT_ORDER ] ) )
        out.write( '%s\t' % ','.join( map( str, column_stats['outliers'] ) ) )
        base_counts = aggregator.get_base_counts_for_column( i )
        for nuc in valid_nucleotides:
            out.write( "%s\t" % base_counts.get( nuc, 0 ) )
        extra_nucs = sorted( [ nuc for nuc in base_counts.keys() if nuc not in valid_nucleotides ] )
        out.write( "%s\t%s\n" % ( ','.join( extra_nucs ), ','.join( str( base_counts[nuc] ) for nuc in extra_nucs ) ) )
    out.close()
    if num_reads is None:
        print "No valid fastq reads could be processed."
    else:
        print "%i fastq reads were processed." % ( num_reads + 1 )
        print "Based upon quality values and sequence characters, the input data is valid for: %s" % ( ", ".join( aggregator.get_valid_formats() ) or "None" )
        ascii_range = aggregator.get_ascii_range()
        decimal_range =  aggregator.get_decimal_range()
        print "Input ASCII range: %s(%i) - %s(%i)" % ( repr( ascii_range[0] ), ord( ascii_range[0] ), repr( ascii_range[1] ), ord( ascii_range[1] ) ) #print using repr, since \x00 (null) causes info truncation in galaxy when printed
        print "Input decimal range: %i - %i" % ( decimal_range[0], decimal_range[1] )

if __name__ == "__main__": main()