nodece opened a new pull request, #22557:
URL: https://github.com/apache/pulsar/pull/22557
### Motivation
The tab-completion is a important feature, we migrate the CLI parser to
picocli from jcommander, right now we can use the picocli autocomplete to do
that.
- pulsar-admin
```
❯ source <(bin/pulsar-admin generate-completion)
❯ bin/pulsar-admin topics clear-backlog --subscription
--help --subscription --version -h -s
-v
```
- pulsar-client
```
❯ source <(bin/pulsar-client generate-completion)
❯ bin/pulsar-client produce -h
--chunking --files --key-value-key
--rate -db -h
-kvkf -s
--disable-batching --help --key-value-key-file
--separator -dr -k
-m -v
--disable-replication --key --messages
--value-schema -ekn -ks
-n -vs
--encryption-key-name --key-schema --num-produce
--version -ekv -kvet
-p
--encryption-key-value --key-value-encoding-type --properties
-c -f -kvk
-r
```
### Modifications
- Add `generate-completion` command to the `pulsar-admin` and `pulsar-client`
### Documentation
<!-- DO NOT REMOVE THIS SECTION. CHECK THE PROPER BOX ONLY. -->
- [ ] `doc` <!-- Your PR contains doc changes. -->
- [ ] `doc-required` <!-- Your PR changes impact docs and you will update
later -->
- [x] `doc-not-needed` <!-- Your PR changes do not impact docs -->
- [ ] `doc-complete` <!-- Docs have been already added -->
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