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Terry Hancock
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README.md
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README.md
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# lsseq
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A simple filter utility for viewing long listings of text that have
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either repeating lines or sequential lines. Usage is similar to "uniq",
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except that in addition to condensing duplicates, it condenses runs
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of incrementing or decrementing numbered lines.
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In order to be regarded as a run, lines must contain a single block of
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decimal numerals (with or without zero-padding), which increase by one
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step on each line. It does not matter if there are additional number blocks
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that don't change, and the changing number can appear anywhere in the line.
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Although there is nothing about the program that requires it to be used
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on file listings, it was created to quickly asses PNG or EXR streams
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generated by Blender rendering processes.
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Currently has no switches or controls, and very few features.
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I also created it as a learning project for **Eclipse/PyDev** and integration
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with **Github**, so this is more of a learning project, although it is kind
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of handy.
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Usage example:
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$ ls my_pngstream*.png | lsseq
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If the listing looks like this:
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my_pngstream-f00001.png
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my_pngstream-f00002.png
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my_pngstream-f00003.png
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my_pngstream-f00004.png
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my_pngstream-f00005.png
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my_pngstream-f00010.png
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my_pngstream-f00012.png
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The output will look like this:
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my_pngstream-f00001.png
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... (5) +
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my_pngstream-f00005.png
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my_pngstream-f00010.png
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my_pngstream-f00012.png
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For very long runs, this will be MUCH more compact and readable.
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# TODO
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Would like to add option parsing and some options for ignoring parts of
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the input lines. This would be handy for use with "ls -l" for example,
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to ignore the changing filesize and data numbers, which would currently
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foul the run-detection.
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200
lsseq.py
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lsseq.py
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#!/usr/bin/env python
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# lsseq
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"""
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Filter utility to condense long lists including identical or sequential lines
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of text (such as the names of files in a PNG stream).
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"""
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import sys, re
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def main(inp=sys.stdin):
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"""
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Given a list of strings or lines from a stream, return a reduced
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list showing strings of duplicated lines or lines in an incrementing
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or decrementing sequence (like a PNG-stream):
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>>> sample = '''\
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... S1E01-PC-1-Cam1-f00001.png
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... S1E01-PC-1-Cam1-f00002.png
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... S1E01-PC-1-Cam1-f00103.png
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... S1E01-PC-1-Cam1-f00103.png
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... S1E01-PC-1-Cam1-f00103.png
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... S1E01-PC-1-Cam1-f00104.png
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... S1E01-PC-1-Cam1-f00105.png
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... S1E01-PC-1-Cam1-f00106.png
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... S1E01-PC-1-Cam1-f00107.png
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... S1E01-PC-1-Cam1-f00108.png
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... S1E01-PC-1-Cam1-f02000.png
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... S1E01-PC-1-Cam1-f02300.png
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... S1E01-PC-1-Cam1-f02400.png
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... S1E01-PC-1-Cam1-f02399.png
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... S1E01-PC-1-Cam1-f02398.png
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... S1E01-PC-1-Cam1-f02397.png
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... S1E01-PC-1-Cam1-f02396.png
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... S1E01-PC-1-Cam1-f03555.png
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... S1E01-PC-1-Cam2-f03333.png
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... S1E01-PC-1-Cam2-f03440.png
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... S1E01-PC-1-Cam2-f03441.png
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... '''
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>>> print(main(sample.split('\n')))
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S1E01-PC-1-Cam1-f00001.png
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S1E01-PC-1-Cam1-f00002.png
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S1E01-PC-1-Cam1-f00103.png
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x 3
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S1E01-PC-1-Cam1-f00104.png
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... (5) +
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S1E01-PC-1-Cam1-f00108.png
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S1E01-PC-1-Cam1-f02000.png
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S1E01-PC-1-Cam1-f02300.png
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S1E01-PC-1-Cam1-f02400.png
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... (5) -
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S1E01-PC-1-Cam1-f02396.png
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S1E01-PC-1-Cam1-f03555.png
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S1E01-PC-1-Cam2-f03333.png
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S1E01-PC-1-Cam2-f03440.png
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S1E01-PC-1-Cam2-f03441.png
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>>>
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"""
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listing=[]
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prev = None
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dup_run = 0
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inc_run = 0
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dec_run = 0
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#for line in inp:
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inp_iter = iter(inp)
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while 1:
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try:
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line = inp_iter.next()
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except StopIteration:
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line = None
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if prev is None:
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# first line
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prev = line
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base = line
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continue
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if line:
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comparison = compare_lines(prev, line)
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else:
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comparison = '!='
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if comparison == '==':
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dup_run += 1
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elif comparison == '+1' and not dup_run and not dec_run:
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inc_run += 1
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elif comparison == '-1' and not dup_run and not inc_run:
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dec_run += 1
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else:
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listing.append('')
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listing.append(base)
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if dup_run:
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# Report # of duplicates and reset
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listing.append(' x {0:d}'.format(dup_run+1))
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elif inc_run==1 or dec_run==1:
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# If a listing is only 2 lines, then just list them
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listing.append(prev)
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elif inc_run>1:
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# Show range of increment run
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listing.append(' ... ({0:d}) +'.format(inc_run+1))
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listing.append(prev)
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elif dec_run>1:
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# Show range of decrement run
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listing.append(' ... ({0:d}) -'.format(dec_run+1))
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listing.append(prev)
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else:
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# Next file is unmatched ('!=') to previous
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pass
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dup_run = 0
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inc_run = 0
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dec_run = 0
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base = line
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if not line:
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# final iteration
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break
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prev=line
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return('\n'.join(listing))
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numfield = re.compile(r'(^\d+)')
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othfield = re.compile(r'(^\D+)')
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def breakdown(s):
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"""
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Break a string down into numerical fields delimited by non-numerical fields:
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>>> breakdown('df39-330-spam-51.bar')
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[('a', 'df'), ('0', '39'), ('a', '-'), ('0', '330'), ('a', '-spam-'), ('0', '51'), ('a', '.bar')]
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>>>
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"""
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fields = []
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while (s):
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if numfield.match(s):
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fields.append(('0', numfield.match(s).groups()[0]))
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else:
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fields.append(('a', othfield.match(s).groups()[0]))
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s = s[len(fields[-1][1]):]
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return fields
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def compare_lines(l1, l2):
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"""
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Compare two lines, returning '!=', '==', '+1', '-1', indicating
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different, same, incremented by one, or decremented by one:
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>>> compare_lines('my_line2439_3349.png', 'my_line2439_3350.png')
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'+1'
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>>> compare_lines('my_line2439_3349.png', 'my_line2439_3348.png')
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'-1'
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>>> compare_lines('my_line2439_3349.png', 'my_line2439_8304.png')
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'!='
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>>> compare_lines('my_line2439_3349.png', 'spam_8304.png')
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'!='
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>>> compare_lines('my_line2439_3349.png', 'my_line2439_3349.png')
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'=='
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>>>
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"""
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zl = zip(breakdown(l1), breakdown(l2))
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if all(f1==f2 for (f1,f2) in zl):
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return '=='
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# Check for ONE field incrementing or decrementing by 1:
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comparison = [compare_fields(f1,f2) for (f1,f2) in zl]
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if len([c for c in comparison if c=='+1']) == 1:
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return '+1'
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if len([c for c in comparison if c=='-1']) == 1:
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return '-1'
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#Otherwise, it doesn't match at all
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return '!='
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def compare_fields(f1, f2):
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"""
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Compare fields for equality ('=='), incremented by 1 ('+1'), decremented by 1 ('-1'),
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or other inequality ('!='):
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>>> compare_fields(('0','00345'), ('0','00346'))
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'+1'
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>>>
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"""
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if f1 == f2:
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return '=='
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if f1[0] == '0' and f2[0] == '0':
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delta = int(f2[1]) - int(f1[1])
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if delta == -1:
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return '-1'
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elif delta == 1:
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return '+1'
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return '!='
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if __name__=='__main__':
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print(main(sys.stdin))
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