nu_plugin_len

#!/usr/bin/env python3

# Copyright (C) 2017-2019 Vanessa Sochat.

# This Source Code Form is subject to the terms of the
# Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed
# with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

from nushell.filter import FilterPlugin

# Your filter function will be called by the FilterPlugin, and should
# accept the plugin and the dictionary of params
def runFilter(plugin, params):
    '''runFilter will be executed by the calling FilterPlugin (method filter)
       and should be able to parse the dictionary of params and respond
       appropriately. Useful functions:

       plugin.logger.<level>
       plugin.get_string_primitive()
       plugin.get_int_primitive()
       plugin.print_int_response()
       plugin.print_string_response()
    '''
    # Get the string primitive passed by the user
    value = plugin.get_string_primitive()

    # Calculate the length
    intLength = len(value)

    # Print an integer response (can also be print_string_response)
    plugin.print_int_response(intLength)


# The main function is where you create your plugin and run it.
def main():

    # Initialize a new plugin
    plugin = FilterPlugin(name="len", 
                          usage="Return the length of a string")

    # Run the plugin by passing your filter function
    plugin.run(runFilter)


if __name__ == '__main__':
    main()