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Write your own cat Tool - Python

Solution

The code is structured under cat and is using Pipenv as the package manager

Usage

See,

cat.py --help
age: cat OPTION... [FILE]...

Concatenate FILES(s) to standard output.

With no FILE, or when FILE is -, read standard input.

positional arguments:
  FILE                  The name of the input files, when not specified, reads from stdin. (default: [<_io.BufferedReader name='<stdin>'>])

options:
  -h, --help            show this help message and exit
  -A, --show-all        equivalent to -vET (default: False)
  -b, --number-nonblank
                        number nonempty output lines, overrides -n (default: False)
  -e                    equivalent to -vE (default: False)
  -E, --show-ends       display $ at end of each line (default: False)
  -n, --number          number all output lines (default: False)
  -s, --squeeze-blank   suppress repeated empty output lines (default: False)
  -t                    equivalent to -vT (default: False)
  -T, --show-tabs       display TAB characters as ^I (default: False)
  -u                    (ignored) (default: False)
  -v, --show-nonprinting
                        use ^ and M- notation, except for LFD and TAB (default: False)
  --version             output the version and exit
  -V                    Increase the verbosity (default: 0)

Examples:
cat f - g  Output f's contents, then standard input, then g's contents.
cat        Copy standard input to standard output.

Example(s)

cat -n tests/testdata/test.txt

Development

The cat is in ./cat.py and super straightforward for the basic options

Unit tests

There is not any useful test, just a place holder for future options

pytest -v

Function tests

The directory contains the testdata mentioned in the challenge.

cd tests
./test.sh -p

Issues & Todos

  • The option --show-nonprinting is tricky and not implemented, see open issue #14
  • The handling on printing line number is also different, GNU cat uses 6-20 as fieldwidth and may be '\t', not something that I think is important at the moment

References

cat -v, show-nonprinting

Topics of interest