def open_awk(filelist:list, pos_args:list, delim):
''' Call awk command and return an opened pipe for read the output of awk, eg:
for line in open_awk([file1, file2], [2,3,4], ',').stdout:
print(line)
'''
if isinstance(delim, (bytes, bytearray)):
delim = str(delim, 'utf-8')
if not filelist:
raise ValueError('filelist')
if not pos_args:
raise ValueError('pos_args')
if len(delim) != 1:
raise ValueError('delim must be a length 1 char')
for fn in filelist:
if not exists(fn):
raise FileNotFoundError(fn)
for i in pos_args:
if not isinstance(i, (int, str)):
raise TypeError(pos_args)
if isinstance(i, str) and not i.isdigit():
raise TypeError(pos_args)
cmd = AWK_CMD.safe_substitute(delim=delim,
vargs=','.join(map(lambda x:'$' + str(x), pos_args)),
files=' '.join(filelist))
if __debug__:
print(cmd)
return OSCommand.popen(cmd)
def file_count(textfile:str) -> tuple:
''' Count lines, words, bytes in text file '''
err, ret = OSCommand.call('wc ' + textfile, False)
if err:
raise RuntimeError(os.strerror(err))
if ret:
nline, nword, nbyte, _ = ret.split()
return int(nline), int(nword), int(nbyte)
