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Write your own WC - Python

Though, I might have used a million times, when implementing it I had a chance to sidestep and understand UTF8 encodings, multi-byte characters, encoding of emoj with zero with joiners,the unix definition of a POSIX text file

Solution

The code is structured under wordcount and is using Pipenv as the package manager as I find it better than Poetry due to the overhead in learning new package/dependency manager.

Usage

./wc.py --help
usage: wc.py [-h] [-m] [-c] [-l] [-w] [-L] [--version] [-v] [infiles ...]

A program to count words (wc)

positional arguments:
  infiles               The name of the input files

options:
  -h, --help            show this help message and exit
  -m, --chars           Count the characters
  -c, --bytes           Count the bytes
  -l, --lines           Count the lines
  -w, --word            Count the words
  -L, --max-line-length
                        print the maximum display width
  --version             output the version and exit
  -v, --verbose         Increase the verbosity

Example(s)

Checking the input text mentioned in the challenge step zero

The output from wc (GNU Coreutils) 8.32 on Ubuntu with (LC_NAME=sv_SE.UTF-8)

wc tests/testdata/test.txt
7145  58164 342147 tests/testdata/test.txt

The output from wc.py for the same test.txt,

./wc.py tests/testdata/test.txt
 7145  58164 342147 tests/testdata/test.txt

The output for the various options are same as that of the wc tool and it is verified using both Unit test (Pytests) and functional tests

A sample run for stdin,

echo -n "TwoLines\n\n" | ./wc.py
 2  1 10 <stdin>

Development

Only an single module wc.py, and it uses argparse module for handling arguments, process the file content and outputs depending on the input arguments. The output function attempts to align with wc's structure but that is just me trying to play with the f'string format.

Unit tests

To run the tests, ensure the pipenv shell is activated, as we have pytest dependency.

pytest -vv

Checkout the testcases and see the various inputs it uses.

Function tests

To verify more inputs testdata is used which to compare alignment with wc result by running test.sh.