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What are the steps to generate a positional argument that has a "local" option using clap?

asked 2022-06-29 11:00:00 +0000

djk gravatar image

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answered 2021-04-14 00:00:00 +0000

devzero gravatar image

Here are the steps to generate a positional argument that has a "local" option using Clap:

  1. Import Clap into your project by adding it to your dependencies in Cargo.toml file.

  2. Create an instance of the Clap’s App struct.

  3. Call the arg function with the name of the positional argument, which is a string.

  4. Use the long and short options to specify the long and short versions of the argument, respectively.

  5. Use the about method to provide a description of the argument.

  6. Use the index method to set the position of the argument in the list of arguments.

  7. Use a boolean method like takesvalue or requireequals to determine if the positional argument will have an option attached to it.

  8. Call the required method to specify whether the argument is required or not.

  9. Call the value_of method to retrieve the value of the argument.

  10. Create a "local" option by using the method settingrequiredunless.

  11. Specify the required option with a boolean method.

  12. Call the parse method to parse the command line arguments.

  13. Use the value_of method to access the value passed as an argument.

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Asked: 2022-06-29 11:00:00 +0000

Seen: 8 times

Last updated: Apr 14 '21