Add support for case-insensitive command names

[adw1n]

Right now users decide on supported command name using Command::Use and Command::Aliases. There is no way to tell Cobra to use case-insensitive name matching.

Cobra has SetGlobalNormalizationFunc which can be used to achieve case-insensitive flag name matching but there is no such option for command names. Generating aliases with all possible spellings isn't an option because users would need to have a list of aliases that is 2**len(commandName) characters long. Users aren't able to customize the Command::Find behavior because Command::AddCommand function takes a struct and not an interface.

@jpmcb @jharshman @marckhouzam are maintainers open to accepting a PR that adds functionality which allows users to create commands with case-insensitive command name matching?

Example

Imagine I'm writing a CLI program like kubectl. I want to have get subcommand and have service (aliases: svc, svcs) and deployment (aliases: deployments) subcommands of get subcommand. The sub-subcommand names should be case-insensitive similarly to like how you can do kubectl get sErvICeS. kubectl opted to have no subcommands after get and instead takes the type of resource as first argument. If I wanted to have a case-insensitive service sub-subcommand there is currently no supported way to achieve that.

[github-actions]

This issue is being marked as stale due to a long period of inactivity

[indianwhocodes]

Is this issue planned on being addressed to anytime soon in any of the subsequent releases ?

[johnSchnake]

Seems like a pretty straightforward, reasonable request to me. I'm currently focused on backlog cleanup but I think if you put up the PR I could find time to review it.

To be backwards compatible we just need to gate the behavior with a corresponding option.

[trilopin]

Hi, I would want to help with this one. Is it still a desired enhancement? is anyone already working on it?

[programmer04]

I'd like to see something like this. Let's go for it @trilopin, I can help if you need

[vitaliy-ostapchuk93]

Would love to see this feature! If still open, I would offer to help out?