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A shell columnizer

Project description

shcol is a shell columnizer that works in a similar way as the Unix-tool ls does when rendering directory contents.

Some examples:

>>> import shcol
>>> shcol.print_filenames()  # print contents of current directory
bin    LICENSE  testsuite
build  Makefile    shcol
>>> shcol.print_filenames('testsuite')  # print contents of a subdirectory
test_cli.pyc  test_core.pyc  test_highlevel.pyc  test_script.pyc
>>> shcol.print_filenames('testsuite/*.py')  # only print `*.py`-files
testsuite/   testsuite/
testsuite/  testsuite/
>>> shcol.print_filenames('~/shcol', hide_dotted=False)  # like `ls -A ~/shcol`
bin    .git     Makefile  shcol
build  LICENSE   testsuite

shcol can also columnize the attribute names of a Python-object:

>>> shcol.print_sorted(shcol)
__author__    config    helpers      __package__       print_columnized_mapping
__builtins__  core      highlevel    __path__          print_filenames
cli           __doc__   __license__  print_attrs       __version__
columnize     __file__  __name__     print_columnized
>>> shcol.print_sorted(shcol, spacing=5)
__author__       core          __license__     print_columnized
__builtins__     __doc__       __name__        print_columnized_mapping
cli              __file__      __package__     print_filenames
columnize        helpers       __path__        __version__
config           highlevel     print_attrs

Note that the spacing-parameter as shown above works with all kinds of print_*-functions in shcol.

You can also tell a print_*-function to use a specific line width for its output:

>>> shcol.print_sorted(shcol, spacing=5, line_width=60)
__author__       __file__        print_attrs
__builtins__     helpers         print_columnized
cli              highlevel       print_columnized_mapping
columnize        __license__     print_filenames
config           __name__        __version__
core             __package__
__doc__          __path__

Note that by default the terminal’s width is used as the line width.

And of course, you can columnize arbitrary names with shcol:

>>> shcol.print_columnized(['foo', 'bar', 'baz'], spacing=7)
foo       bar       baz
>>> shcol.print_columnized(['foo', 'bar', 'baz'], spacing=7, sort_items=True)
bar       baz       foo

The following example demonstrates that sorting is locale-aware. Note the German umlaut in it. Hint: You need German as your default locale setting to reproduce that in your Python interpreter:

>>> shcol.print_columnized(['foo', 'bär', 'baz'], sort_items=True)
bär  baz  foo

You can see that shcol handles Unicode-characters as you would expect it.

In case you need the raw columnized string you can get that directly:

>>> shcol.columnize(['foo', 'bär', 'baz'], sort_items=True)  # on Python 2.7
u'b\xe4r  baz  foo'
>>> shcol.columnize(['foo', 'bär', 'baz'], sort_items=True)  # on Python 3.x
'bär  baz  foo'

shcol has its focus on usability and speed. Even large lists will be rendered relatively fast (like shcol.print_filenames('/usr/bin')).

Just give it a try if you like it and feel free to give some feedback. :-)

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