How to generate Fish completions in a program that uses urfave/cli?

[erazemk]

A program I'd like to use uses urfave/cli/v2, but currently doesn't have fish completion, only bash. How can I generate completions for fish? ./<program> generate-completion fish doesn't work, but that's the only example I found in the cli PRs, so I don't know what else to try.

[dearchap]

@erazemk You can try using App.ToFishCompletion() https://github.com/urfave/cli/blob/v2-maint/fish.go#L13 and writing that to the fish complete file. Let me know if that doesnt work.

[erazemk]

That works, thanks!