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PR #1460 fixes this. Can I close this PR ?

@ddouglas Can you add a test case as well ?

Works with latest release.

Dont think so. Would be a good feature to have though

@meatballhat I actually begun working on this sometime back but stopped due to all the generated flag changes etc. Do you have any suggestion on what the output of help...

This will be fixed by PR #1245

Here is how I implemented it using GenericFlag and a custom value https://play.golang.org/p/BWBaQ0tTLKe

There is a PR for this feature. https://github.com/urfave/cli/pull/1234

There are 2 ways to approach this. One is with PR #1234 . The other is using validations as in PR #1261 . Its upto the maintainers to choose the...

This is a good feature to have. Theoretically this feature could be implemented in the Before function of the command with a standard set of validators, regex and filepath validator,...