annotate diagonal_partition.py @ 10:ec709ce3d91b draft

planemo upload for repository https://github.com/richard-burhans/galaxytools/tree/main/tools/segalign commit 701d5b6d0b25dbd9d2a8c08234f3aca7ef502131

#!/usr/bin/env python

"""
Diagonal partitioning for segment files output by SegAlign.

Usage:
diagonal_partition.py <max-segments> <lastz-command>

set <max-segments> = 0 to skip partitioning, -1 to infer best parameter
"""


import os
import sys
import typing


def chunks(lst: tuple[str, ...], n: int) -> typing.Iterator[tuple[str, ...]]:
    """Yield successive n-sized chunks from list."""
    for i in range(0, len(lst), n):
        yield lst[i:i + n]


if __name__ == "__main__":

    DELETE_AFTER_CHUNKING = True
    MIN_CHUNK_SIZE = 5000  # don't partition segment files with line count below this value

    # input_params = "10000 sad sadsa sad --segments=tmp21.block0.r0.minus.segments dsa sa --strand=plus --output=out.maf sadads 2> logging.err"
    # sys.argv = [sys.argv[0]] + input_params.split(' ')
    chunk_size = int(sys.argv[1])  # first parameter contains chunk size
    params = sys.argv[2:]

    # don't do anything if 0 chunk size
    if chunk_size == 0:
        print(" ".join(params), flush=True)
        exit(0)

    # Parsing command output from SegAlign
    segment_key = "--segments="
    segment_index = None
    input_file = None

    for index, value in enumerate(params):
        if value[:len(segment_key)] == segment_key:
            segment_index = index
            input_file = value[len(segment_key):]
            break

    if segment_index is None:
        sys.exit(f"Error: could not get segment key {segment_key} from parameters {params}")

    if input_file is None:
        sys.exit(f"Error: could not get segment file from parameters {params}")

    if not os.path.isfile(input_file):
        sys.exit(f"Error: File {input_file} does not exist")

    line_size = None  # each char in 1 byte
    file_size = os.path.getsize(input_file)
    with open(input_file, "r") as f:
        line_size = len(f.readline())  # add 1 for newline

    estimated_lines = file_size // line_size

    # check if chunk size should be estimated
    if chunk_size < 0:
        # optimization, do not need to get each file size in this case
        if estimated_lines < MIN_CHUNK_SIZE:
            print(" ".join(params), flush=True)
            exit(0)

        from collections import defaultdict
        from statistics import quantiles
        # get size of each segment assuming DELETE_AFTER_CHUNKING == True
        # takes into account already split segments
        files = [i for i in os.listdir(".") if i.endswith(".segments")]
        # find . -maxdepth 1 -name "*.segments" -print0 | du -ba --files0-from=-
        # if not enough segment files for estimation, continue
        if len(files) <= 2:
            print(" ".join(params), flush=True)
            exit(0)

        fdict: typing.DefaultDict[str, int] = defaultdict(int)
        for filename in files:
            size = os.path.getsize(filename)
            f_ = filename.split(".split", 1)[0]
            fdict[f_] += size
        chunk_size = int(quantiles(fdict.values())[-1] // line_size)

    if file_size // line_size <= chunk_size:  # no need to sort if number of lines <= chunk_size
        print(" ".join(params), flush=True)
        exit(0)

    # Find rest of relevant parameters
    output_key = "--output="
    output_index = None
    output_alignment_file = None
    output_alignment_file_base = None
    output_format = None

    strand_key = "--strand="
    strand_index = None
    for index, value in enumerate(params):
        if value[:len(output_key)] == output_key:
            output_index = index
            output_alignment_file = value[len(output_key):]
            output_alignment_file_base, output_format = output_alignment_file.rsplit(".", 1)
        if value[:len(strand_key)] == strand_key:
            strand_index = index

    if output_index is None:
        sys.exit(f"Error: could not get output key {output_key} from parameters {params}")

    if output_alignment_file_base is None:
        sys.exit(f"Error: could not get output alignment file base from parameters {params}")

    if output_format is None:
        sys.exit(f"Error: could not get output format from parameters {params}")

    if strand_index is None:
        sys.exit(f"Error: could not get strand key {strand_key} from parameters {params}")

    err_index = -1  # error file is at very end
    err_name_base = params[-1].split(".err", 1)[0]

    data: dict[tuple[str, str], list[tuple[int, int, str]]] = {}  # dict of list of tuple (x, y, str)

    direction = None
    if "plus" in params[strand_index]:
        direction = "f"
    elif "minus" in params[strand_index]:
        direction = "r"
    else:
        sys.exit(f"Error: could not figure out direction from strand value {params[strand_index]}")

    for line in open(input_file, "r"):
        if line == "":
            continue
        seq1_name, seq1_start, seq1_end, seq2_name, seq2_start, seq2_end, _dir, score = line.split()
        # data.append((int(seq1_start), int(seq2_start), line))
        half_dist = int((int(seq1_end) - int(seq1_start)) // 2)
        assert int(seq1_end) > int(seq1_start)
        assert int(seq2_end) > int(seq2_start)
        seq1_mid = int(seq1_start) + half_dist
        seq2_mid = int(seq2_start) + half_dist
        data.setdefault((seq1_name, seq2_name), []).append((seq1_mid, seq2_mid, line))

    # If there are chromosome pairs with segment count <= chunk_size
    # then no need to sort and split these pairs into separate files.
    # It is better to keep these pairs in a single segment file.
    skip_pairs = []  # pairs that have count <= chunk_size. these will not be sorted

    # save query key order
    # for lastz segment files: 'Query sequence names must appear in the same
    # order as they do in the query file'
    query_key_order = list(dict.fromkeys([i[1] for i in data.keys()]))

    # NOTE: assuming data.keys() preserves order of keys. Requires Python 3.7+

    if len(data.keys()) > 1:
        for pair in data.keys():
            if len(data[pair]) <= chunk_size:
                skip_pairs.append(pair)

    # sorting for forward segments
    if direction == "r":
        for pair in data.keys():
            if pair not in skip_pairs:
                data[pair] = sorted(data[pair], key=lambda coord: (coord[1] - coord[0], coord[0]))
    # sorting for reverse segments
    elif direction == "f":
        for pair in data.keys():
            if pair not in skip_pairs:
                data[pair] = sorted(data[pair], key=lambda coord: (coord[1] + coord[0], coord[0]))
    else:
        sys.exit(f"INVALID DIRECTION VALUE: {direction}")

    # Writing file in chunks
    ctr = 0
    for pair in data.keys() - skip_pairs:  # [i for i in data_keys if i not in set(skip_pairs)]:
        for chunk in chunks(list(zip(*data[pair]))[2], chunk_size):
            ctr += 1
            name_addition = f".split{ctr}"
            fname = input_file.split(".segments", 1)[0] + name_addition + ".segments"

            assert len(chunk) != 0
            with open(fname, "w") as f:
                f.writelines(chunk)
            # update segment file in command
            params[segment_index] = segment_key + fname
            # update output file in command
            params[output_index] = output_key + output_alignment_file_base + name_addition + "." + output_format
            # update error file in command
            params[-1] = err_name_base + name_addition + ".err"
            print(" ".join(params), flush=True)

    # writing unsorted skipped pairs
    if len(skip_pairs) > 0:
        skip_pairs_with_len = sorted([(len(data[p]), p) for p in skip_pairs])   # list of tuples of (pair length, pair)
        # NOTE: This can violate lastz query key order requirement

        query_key_order_table = {item: idx for idx, item in enumerate(query_key_order)}  # used for sorting

        aggregated_skip_pairs: list[list[tuple[str, str]]] = []  # list of list of pair names
        current_count = 0
        aggregated_skip_pairs.append([])
        for count, pair in skip_pairs_with_len:
            if current_count + count <= chunk_size:
                current_count += count
                aggregated_skip_pairs[-1].append(pair)
            else:
                aggregated_skip_pairs.append([])
                current_count = count
                aggregated_skip_pairs[-1].append(pair)

        for aggregate in aggregated_skip_pairs:
            ctr += 1
            name_addition = f".split{ctr}"
            fname = input_file.split(".segments", 1)[0] + name_addition + ".segments"

            with open(fname, "w") as f:
                # fix possible lastz query key order violations
                for pair in sorted(aggregate, key=lambda p: query_key_order_table[p[1]]):  # p[1] is query key
                    chunk = list(zip(*data[pair]))[2]
                    f.writelines(chunk)
            # update segment file in command
            params[segment_index] = segment_key + fname
            # update output file in command
            params[output_index] = output_key + output_alignment_file_base + name_addition + "." + output_format
            # update error file in command
            params[-1] = err_name_base + name_addition + ".err"
            print(" ".join(params), flush=True)

    if DELETE_AFTER_CHUNKING:
        os.remove(input_file)