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Add new test data kao
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.../sample_metadata/Cdiphtheriae_test_1.xlsx → ...ts/sample_metadata/bacteria_metadata.xlsx
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#!/usr/bin/env python | ||
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"""Provide a command line tool to validate and transform tabular samplesheets.""" | ||
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import argparse | ||
import csv | ||
import logging | ||
import sys | ||
from collections import Counter | ||
from pathlib import Path | ||
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logger = logging.getLogger() | ||
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class RowChecker: | ||
""" | ||
Define a service that can validate and transform each given row. | ||
Attributes: | ||
modified (list): A list of dicts, where each dict corresponds to a previously | ||
validated and transformed row. The order of rows is maintained. | ||
""" | ||
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VALID_FORMATS = ( | ||
".fq.gz", | ||
".fastq.gz", | ||
) | ||
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def __init__( | ||
self, | ||
sample_col="sample", | ||
first_col="fastq_1", | ||
second_col="fastq_2", | ||
single_col="single_end", | ||
**kwargs, | ||
): | ||
""" | ||
Initialize the row checker with the expected column names. | ||
Args: | ||
sample_col (str): The name of the column that contains the sample name | ||
(default "sample"). | ||
first_col (str): The name of the column that contains the first (or only) | ||
FASTQ file path (default "fastq_1"). | ||
second_col (str): The name of the column that contains the second (if any) | ||
FASTQ file path (default "fastq_2"). | ||
single_col (str): The name of the new column that will be inserted and | ||
records whether the sample contains single- or paired-end sequencing | ||
reads (default "single_end"). | ||
""" | ||
super().__init__(**kwargs) | ||
self._sample_col = sample_col | ||
self._first_col = first_col | ||
self._second_col = second_col | ||
self._single_col = single_col | ||
self._seen = set() | ||
self.modified = [] | ||
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def validate_and_transform(self, row): | ||
""" | ||
Perform all validations on the given row and insert the read pairing status. | ||
Args: | ||
row (dict): A mapping from column headers (keys) to elements of that row | ||
(values). | ||
""" | ||
self._validate_sample(row) | ||
self._validate_first(row) | ||
self._validate_second(row) | ||
self._validate_pair(row) | ||
self._seen.add((row[self._sample_col], row[self._first_col])) | ||
self.modified.append(row) | ||
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def _validate_sample(self, row): | ||
"""Assert that the sample name exists and convert spaces to underscores.""" | ||
assert len(row[self._sample_col]) > 0, "Sample input is required." | ||
# Sanitize samples slightly. | ||
row[self._sample_col] = row[self._sample_col].replace(" ", "_") | ||
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def _validate_first(self, row): | ||
"""Assert that the first FASTQ entry is non-empty and has the right format.""" | ||
assert len(row[self._first_col]) > 0, "At least the first FASTQ file is required." | ||
self._validate_fastq_format(row[self._first_col]) | ||
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def _validate_second(self, row): | ||
"""Assert that the second FASTQ entry has the right format if it exists.""" | ||
if len(row[self._second_col]) > 0: | ||
self._validate_fastq_format(row[self._second_col]) | ||
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def _validate_pair(self, row): | ||
"""Assert that read pairs have the same file extension. Report pair status.""" | ||
if row[self._first_col] and row[self._second_col]: | ||
row[self._single_col] = False | ||
assert ( | ||
Path(row[self._first_col]).suffixes[-2:] == Path(row[self._second_col]).suffixes[-2:] | ||
), "FASTQ pairs must have the same file extensions." | ||
else: | ||
row[self._single_col] = True | ||
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def _validate_fastq_format(self, filename): | ||
"""Assert that a given filename has one of the expected FASTQ extensions.""" | ||
assert any(filename.endswith(extension) for extension in self.VALID_FORMATS), ( | ||
f"The FASTQ file has an unrecognized extension: {filename}\n" | ||
f"It should be one of: {', '.join(self.VALID_FORMATS)}" | ||
) | ||
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def validate_unique_samples(self): | ||
""" | ||
Assert that the combination of sample name and FASTQ filename is unique. | ||
In addition to the validation, also rename the sample if more than one sample, | ||
FASTQ file combination exists. | ||
""" | ||
assert len(self._seen) == len(self.modified), "The pair of sample name and FASTQ must be unique." | ||
if len({pair[0] for pair in self._seen}) < len(self._seen): | ||
counts = Counter(pair[0] for pair in self._seen) | ||
seen = Counter() | ||
for row in self.modified: | ||
sample = row[self._sample_col] | ||
seen[sample] += 1 | ||
if counts[sample] > 1: | ||
row[self._sample_col] = f"{sample}_T{seen[sample]}" | ||
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def read_head(handle, num_lines=2): | ||
"""Read the specified number of lines from the current position in the file.""" | ||
lines = [] | ||
for idx, line in enumerate(handle): | ||
if idx == num_lines: | ||
break | ||
lines.append(line) | ||
return "".join(lines) | ||
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def sniff_format(handle): | ||
""" | ||
Detect the tabular format. | ||
Args: | ||
handle (text file): A handle to a `text file`_ object. The read position is | ||
expected to be at the beginning (index 0). | ||
Returns: | ||
csv.Dialect: The detected tabular format. | ||
.. _text file: | ||
https://docs.python.org/3/glossary.html#term-text-file | ||
""" | ||
peek = read_head(handle) | ||
handle.seek(0) | ||
sniffer = csv.Sniffer() | ||
if not sniffer.has_header(peek): | ||
logger.critical(f"The given sample sheet does not appear to contain a header.") | ||
sys.exit(1) | ||
dialect = sniffer.sniff(peek) | ||
return dialect | ||
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def check_samplesheet(file_in, file_out): | ||
""" | ||
Check that the tabular samplesheet has the structure expected by nf-core pipelines. | ||
Validate the general shape of the table, expected columns, and each row. Also add | ||
an additional column which records whether one or two FASTQ reads were found. | ||
Args: | ||
file_in (pathlib.Path): The given tabular samplesheet. The format can be either | ||
CSV, TSV, or any other format automatically recognized by ``csv.Sniffer``. | ||
file_out (pathlib.Path): Where the validated and transformed samplesheet should | ||
be created; always in CSV format. | ||
Example: | ||
This function checks that the samplesheet follows the following structure, | ||
see also the `viral recon samplesheet`_:: | ||
sample,fastq_1,fastq_2 | ||
SAMPLE_PE,SAMPLE_PE_RUN1_1.fastq.gz,SAMPLE_PE_RUN1_2.fastq.gz | ||
SAMPLE_PE,SAMPLE_PE_RUN2_1.fastq.gz,SAMPLE_PE_RUN2_2.fastq.gz | ||
SAMPLE_SE,SAMPLE_SE_RUN1_1.fastq.gz, | ||
.. _viral recon samplesheet: | ||
https://raw.githubusercontent.com/nf-core/test-datasets/viralrecon/samplesheet/samplesheet_test_illumina_amplicon.csv | ||
""" | ||
required_columns = {"sample", "fastq_1", "fastq_2"} | ||
# See https://docs.python.org/3.9/library/csv.html#id3 to read up on `newline=""`. | ||
with file_in.open(newline="") as in_handle: | ||
reader = csv.DictReader(in_handle, dialect=sniff_format(in_handle)) | ||
# Validate the existence of the expected header columns. | ||
if not required_columns.issubset(reader.fieldnames): | ||
logger.critical(f"The sample sheet **must** contain the column headers: {', '.join(required_columns)}.") | ||
sys.exit(1) | ||
# Validate each row. | ||
checker = RowChecker() | ||
for i, row in enumerate(reader): | ||
try: | ||
checker.validate_and_transform(row) | ||
except AssertionError as error: | ||
logger.critical(f"{str(error)} On line {i + 2}.") | ||
sys.exit(1) | ||
checker.validate_unique_samples() | ||
header = list(reader.fieldnames) | ||
header.insert(1, "single_end") | ||
# See https://docs.python.org/3.9/library/csv.html#id3 to read up on `newline=""`. | ||
with file_out.open(mode="w", newline="") as out_handle: | ||
writer = csv.DictWriter(out_handle, header, delimiter=",") | ||
writer.writeheader() | ||
for row in checker.modified: | ||
writer.writerow(row) | ||
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def parse_args(argv=None): | ||
"""Define and immediately parse command line arguments.""" | ||
parser = argparse.ArgumentParser( | ||
description="Validate and transform a tabular samplesheet.", | ||
epilog="Example: python check_samplesheet.py samplesheet.csv samplesheet.valid.csv", | ||
) | ||
parser.add_argument( | ||
"file_in", | ||
metavar="FILE_IN", | ||
type=Path, | ||
help="Tabular input samplesheet in CSV or TSV format.", | ||
) | ||
parser.add_argument( | ||
"file_out", | ||
metavar="FILE_OUT", | ||
type=Path, | ||
help="Transformed output samplesheet in CSV format.", | ||
) | ||
parser.add_argument( | ||
"-l", | ||
"--log-level", | ||
help="The desired log level (default WARNING).", | ||
choices=("CRITICAL", "ERROR", "WARNING", "INFO", "DEBUG"), | ||
default="WARNING", | ||
) | ||
return parser.parse_args(argv) | ||
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def main(argv=None): | ||
"""Coordinate argument parsing and program execution.""" | ||
args = parse_args(argv) | ||
logging.basicConfig(level=args.log_level, format="[%(levelname)s] %(message)s") | ||
if not args.file_in.is_file(): | ||
logger.error(f"The given input file {args.file_in} was not found!") | ||
sys.exit(2) | ||
args.file_out.parent.mkdir(parents=True, exist_ok=True) | ||
check_samplesheet(args.file_in, args.file_out) | ||
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if __name__ == "__main__": | ||
sys.exit(main()) |
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