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Command line argument files


Would there be any interest in using picocli (
https://github.com/remkop/picocli) as the command line parser in
`org.apache.tools.ant.Main`?

Picocli has support for @-files (https://picocli.info/#AtFiles ) to handle
cases where the length of the command line exceeds the OS limitations. (I
believe there was a recent request for this feature on the user list.)

The Main class will likely become shorter and easier to maintain.

As a bonus, picocli generates nice-looking help with ANSI colors and can
generate completion scripts to get command line completion on bash and zsh
shells.

The trade-off is the additional external dependency.

Picocli is relatively new (1.0 released in Aug 2017) but has growing
adoption and is used in Groovy, Micronaut, JUnit 5 and CheckStyle.

I’d be happy to provide a PR if there’s interest.

Remko Popma