]> code.communitydata.science - cdsc_reddit.git/blob - datasets/helper.py
Refactor and reorganze.
[cdsc_reddit.git] / datasets / helper.py
1 from subprocess import Popen, PIPE
2 import re
3 from collections import defaultdict
4 from os import path
5 import glob
6
7 def find_dumps(dumpdir, base_pattern):
8
9     files = glob.glob(path.join(dumpdir,base_pattern))
10
11     # build a dictionary of possible extensions for each dump
12     dumpext = defaultdict(list)
13     for fpath in files:
14         fname, ext = path.splitext(fpath)
15         dumpext[fname].append(ext)
16
17     ext_priority = ['.zst','.xz','.bz2','.gz']
18
19     for base, exts in dumpext.items():
20         ext = [ext for ext in ext_priority if ext in exts][0]
21         yield base + ext
22
23 def open_fileset(files):
24     for fh in files:
25         print(fh)
26         lines = open_input_file(fh)
27         for line in lines:
28             yield line
29
30 def open_input_file(input_filename):
31     if re.match(r'.*\.7z$', input_filename):
32         cmd = ["7za", "x", "-so", input_filename, '*'] 
33     elif re.match(r'.*\.gz$', input_filename):
34         cmd = ["zcat", input_filename] 
35     elif re.match(r'.*\.bz2$', input_filename):
36         cmd = ["bzcat", "-dk", input_filename] 
37     elif re.match(r'.*\.bz', input_filename):
38         cmd = ["bzcat", "-dk", input_filename] 
39     elif re.match(r'.*\.xz', input_filename):
40         cmd = ["xzcat",'-dk', '-T 20',input_filename]
41     elif re.match(r'.*\.zst',input_filename):
42         cmd = ['zstd','-dck', input_filename]
43     elif re.match(r'.*\.gz',input_filename):
44         cmd = ['gzip','-dc', input_filename]
45     try:
46         input_file = Popen(cmd, stdout=PIPE).stdout
47     except NameError as e:
48         print(e)
49         input_file = open(input_filename, 'r')
50     return input_file
51

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