Implementing autocompletion for karmadactl

[zhzhuang-zju]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Implementing autocompletion for karmadactl, which can save you a lot of typing.

Which issue(s) this PR fixes:
Parts of #5477

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

`karmadactl`: Implementing autocompletion for karmadactl to save a lot of typing

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 1.46699% with 403 lines in your changes missing coverage. Please review.

Project coverage is 33.93%. Comparing base (4ac95b9) to head (a684edd).
Report is 46 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/karmadactl/util/completion/completion.go	1.19%	248 Missing and 1 partial ⚠️
pkg/karmadactl/get/get.go	0.00%	41 Missing ⚠️
pkg/karmadactl/completion/completion.go	0.00%	38 Missing ⚠️
pkg/karmadactl/karmadactl.go	0.00%	9 Missing ⚠️
pkg/karmadactl/exec/exec.go	0.00%	6 Missing ⚠️
pkg/karmadactl/attach/attach.go	0.00%	5 Missing ⚠️
pkg/karmadactl/describe/describe.go	0.00%	5 Missing ⚠️
pkg/karmadactl/apply/apply.go	0.00%	4 Missing ⚠️
pkg/karmadactl/cordon/cordon.go	0.00%	4 Missing ⚠️
pkg/karmadactl/explain/explain.go	0.00%	4 Missing ⚠️
... and 16 more

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5533      +/-   ##
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+ Coverage   32.45%   33.93%   +1.48%     
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+ Hits        14440    15223     +783     
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Flag	Coverage Δ
unittests	33.93% <1.46%> (+1.48%)	⬆️

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[RainbowMango]

Looks great! Can't wait to try it!
Hi @ahorine , I guess you might like it.

[zhzhuang-zju]

Looks great! Can't wait to try it!
Hi @ahorine , I guess you might like it.

The introduction of karmadactl completion this time significantly reduces the amount of typing required during routine operations. Compared to kubectl completion, karmadactl completion has made extensive adaptations for karmadactl. I will put together a guide on how to use karmadactl completion to enhance the operational experience. Everyone is welcome to give it a try~ @ahorine @RainbowMango @mohamedawnallah

[zhzhuang-zju]

Currently, karmadactl completion support output shell completion code for the specified shell:

• zsh
  source <(karmadactl completion zsh)
• bash
  source <(karmadactl completion bash)
  Theoretically, it should also support fish and powershell, though this hasn't been verified yet. Verification and implementation can be done in subsequent steps.

Here are the autocompletion capabilities provided by karmadactl completion:

• Autocomplete karmadactl
  By typing k and pressing the tab key, karmadactl can be autocompleted.

$ k
... karmadactl ... kubectl ...

• Autocomplete karmadactl subcommands
  By typing karmadactl and pressing the tab key, the subcommands supported by karmadactl can be autocompleted.

$ karmadactl 
addons         -- Enable or disable a Karmada addon
annotate       -- Update the annotations on a resource
api-resources  -- Print the supported API resources on the server

• Autocomplete flags
  Currently supports autocompletion for flags namespace, cluster, clusters, karmada-context, and operation-scope.
  The values autocompleted for operation-scope vary depending on the command. For example, the get command supports operation-scope values of karmada, members, and all, so these options will be available for selection during autocompletion. However, when autocompleting the operation-scope flag for the exec command, only karmada and members will appear.

$ karmadactl exec --operation-scope 
karmada  members
$ karmadactl get --operation-scope 
all      karmada  members

• Autocomplete resources that can be operated on by commands
  For example, for the get command:

$ karmadactl get 
apiservices.apiregistration.k8s.io                            endpoints                                                     nodes.metrics.k8s.io                                          resourceregistries.search.karmada.io                        
...
$ karmadactl get pods 
nginx  pod1 

Highlights

• The autocompletion content varies depending on the command. For example, the operation-scope flag. This not only helps complete the content but also assists users in entering the correct values.
• When autocompleting resources for commands, it takes into account the flags operation-scope, cluster, and clusters.

Using the get command as an example:

• karmadactl get pods will autocomplete the list of pods in the Karmada control plane.
• karmadactl get pods --operation-scope all will autocomplete the list of pods in the Karmada control plane and all member clusters.
• karmadactl get pods --operation-scope members will autocomplete the list of pods in all member clusters.
• karmadactl get pods --operation-scope members --clusters member1,member2 will autocomplete the list of pods in member clusters member1 and member2.

[Vacant2333]

its a great improvement for karmadactl, do u need update autocompletion to the karmada docs?

[zhzhuang-zju]

its a great improvement for karmadactl, do u need update autocompletion to the karmada docs?

yes, we can publish a guidance document as long as this pr is merged. Are you willing to submit a pr for this?

[RainbowMango]

Just some nits, otherwise LGTM.

[RainbowMango]

/lgtm
/approve
Great job!

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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