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#!/usr/bin/env python
# This code is part of the metagenomic SNV calling pipeline (metaSNV)
# Helper script to initiate a new project file structure.
import argparse
from sys import stderr, exit
from os import path
from glob import glob
import os
import shutil
import subprocess
import multiprocessing
basedir = os.path.dirname(os.path.abspath(__file__))
def mkdir_p(dirname):
'''Equivalent to 'mkdir -p' on the command line'''
from os import makedirs
try:
makedirs(dirname)
except OSError:
pass
def create_directories(basedir):
mkdir_p(basedir)
for sub in ['cov',
'bestsplits',
'snpCaller',
'filtered',
'filtered/pop',
'filtered/ind',
'distances']:
mkdir_p(path.join(basedir, sub))
def exit_worker(signum, frame):
raise RuntimeError("Keyboard Interrupt")
def init_worker():
import signal
signal.signal(signal.SIGINT, exit_worker)
def run_sample(sample, command):
'''Simply wraps subprocess.call and returns contextual information in order
to provide a good error message (if necessary)'''
ret = subprocess.call(command)
return sample, command, ret
def compute_opt(args):
out_dir = path.join(args.project_dir, 'cov')
try:
os.makedirs(out_dir)
except:
pass
p = multiprocessing.Pool(args.threads, init_worker)
results = []
for line in open(args.all_samples):
line = line.rstrip()
name = path.basename(line)
cmd = ['{}/src/qaTools/qaCompute'.format(basedir)
,'-c' ,'10', '-d',
'-i', line, '{}/{}.cov'.format(out_dir, name)]
if args.print_commands:
print(" ".join(cmd))
else:
results.append(p.apply_async(run_sample, (name, cmd)))
p.close()
p.join()
for r in results:
sample, command, ret = r.get()
if ret:
stderr.write("Failure in sample {}".format(sample))
stderr.write("Call to {} failed.".format(' '.join(cmd)))
exit(1)
def split_opt(args):
if args.n_splits > 100:
stderr.write("Maximum number of splits is 100.\n")
exit(1)
older_files = glob(args.project_dir + '/bestsplits/*')
if older_files:
stderr.write("\nremoving old splits.\n")
for f in older_files:
os.unlink(f)
cov_dir = path.join(args.project_dir, 'cov')
cov_files = glob(cov_dir + '/*.cov')
project_name = path.basename(args.project_dir)
if not cov_files:
if not args.print_commands:
stderr.write("Coverage files not found.\n")
else:
stderr.write("Coverage files not found.\nFinish running the commands prinnted above and then run this command again.\n")
exit(1)
for f in cov_files:
cmd = ['python',
path.join(basedir, 'src/computeGenomeCoverage.py'),
f,
f + '.detail',
f + '.summary']
subprocess.call(cmd)
print("\nCoverage summary here: {}".format(args.project_dir))
print(" Average vertical genome coverage: '{}/{}.all_cov.tab'".format(args.project_dir, project_name))
print(" Horizontal genome coverage (1X): '{}/{}.all_perc.tab'".format(args.project_dir, project_name))
cmd = ['python',
'{}/src/collapse_coverages.py'.format(basedir),
args.project_dir]
subprocess.call(cmd)
print("\nCalculating best database split:")
# usage createOptimumSplit.sh <all_cov.tab> <all_perc.tab> <geneDefinitions> <INT_NrSplits> <.outfile>
cmd = ['python',
'{}/src/createOptimumSplit.py'.format(basedir),
"{}/{}.all_cov.tab".format(args.project_dir, project_name),
"{}/{}.all_perc.tab".format(args.project_dir, project_name),
args.ctg_len,
str(args.n_splits),
path.join(args.project_dir, "bestsplits", "best_split")]
subprocess.call(cmd)
def execute_snp_call(args, snpCaller, ifile, ofile, split):
db_ann_args = []
if args.db_ann != '':
db_ann_args = ['-g', args.db_ann]
split_args = []
if split:
split_args = ['-l', str(split)]
samtools_cmd = ['samtools',
'mpileup',
'-f', args.ref_db
] + split_args + [
'-B',
'-b', args.all_samples]
snpcaller_cmd = [
snpCaller, '-f', args.ref_db] + db_ann_args + [
'-i', ifile]
if args.print_commands:
print(" ".join(samtools_cmd + ['|'] + snpcaller_cmd + ['>', ofile]))
else:
with open(ofile, 'wt') as ofile:
samtools_call = subprocess.Popen(samtools_cmd, stdout=subprocess.PIPE)
snpcaller_call = subprocess.Popen(snpcaller_cmd, stdin=samtools_call.stdout, stdout=ofile)
samtools_call.stdout.close()
return snpcaller_call.wait()
def snp_call(args):
out_dir = path.join(args.project_dir, 'snpCaller')
try:
os.makedirs(out_dir)
except:
pass
shutil.copy(args.all_samples,args.project_dir+'/all_samples')
snpCaller = basedir + "/src/snpCaller/snpCall"
indiv_out = path.join(out_dir, "indiv_called")
called_SNP = path.join(out_dir, "called_SNPs")
## ACTUAL COMMANDLINE
# Note: Due to a bug in samtools v0.1.18, -Q 20 might be erroneous to use.
# Note: Different phred score scales might be disregarded.
# Note: If samtools > v0.1.18 is used -Q 20 filtering is highly recommended.
threads = (args.threads if not args.print_commands else 1)
p = multiprocessing.Pool(threads, init_worker)
results = []
if args.n_splits > 1:
splits = glob('{}/bestsplits/best_split_*'.format(args.project_dir))
for split in splits:
results.append(p.apply_async(execute_snp_call,
(args,
snpCaller,
'{}.{}'.format(indiv_out, path.basename(split)),
'{}.{}'.format(called_SNP, path.basename(split)),
split)))
p.close()
p.join()
for r in results:
v = r.wait()
if v > 0:
stderr.write("SNV calling failed")
exit(1)
else:
v = execute_snp_call(args, snpCaller, indiv_out, called_SNP, None)
if v > 0:
stderr.write("SNV calling failed")
exit(1)
def main():
parser = argparse.ArgumentParser(description='Compute SNV profiles')
parser.add_argument('project_dir', metavar='DIR',
help='A metaSNP initialized project directory')
parser.add_argument('all_samples', metavar='FILE',
help='File with an input list of bam files, one file per line')
parser.add_argument("ref_db", metavar='REF_DB_FILE',
help='reference multi-sequence FASTA file used for the alignments.')
parser.add_argument('--db_ann', metavar='BED_FILE',default='',
help='Database gene annotation.')
parser.add_argument('--print-commands', default=False, action='store_true',
help='Instead of executing the commands, simply print them out')
parser.add_argument('--threads', metavar='INT', default=1,type=int,
help='Number of jobs to run simmultaneously. Will create same number of splits, unless n_splits set differently.')
parser.add_argument('--n_splits', metavar='INT', default=1,type=int,
help='Number of bins to split ref into')
parser.add_argument('--ctg_len',metavar='BED_FILE',default='',
help='Per contig lengths, required for splitting.')
args = parser.parse_args()
if not path.isfile(args.ref_db):
stderr.write('''
ERROR: No reference database or annotation file found!"
ERROR: '{}' is not a file."
SOLUTION: run getRefDB.sh or set up a custom database before running metaSNP caller
'''.format(args.ref_db))
parser.print_help()
exit(1)
if not path.isfile(basedir+"/src/qaTools/qaCompute") or not path.isfile(basedir+"/src/snpCaller/snpCall"):
stderr.write('''
ERROR: No binaries found
SOLUTION: make\n\n'''.format(basedir))
exit(1)
if (args.n_splits > 1 or args.threads > 1) and args.ctg_len=='':
stderr.write('''
ERROR: No contig information supplied. Cannot compute splits
SOLUTION: Supply contig information through --ctg_len\n\n'''.format(basedir))
exit(1)
if args.threads > 1 and args.n_splits==1:
args.n_splits=args.threads
if path.exists(args.project_dir) and not args.print_commands:
stderr.write("Project directory '{}' already exists\n\n\n".format(args.project_dir))
exit(1)
create_directories(args.project_dir)
compute_opt(args)
if args.n_splits > 1:
split_opt(args)
snp_call(args)
if __name__ == '__main__':
main()