Completion of command arguments and options is coming in Symfony 5.4 (#38275). Command and option names are already autocompleted, but argument and option values needs to be implemented on each command.

As an example, #42251 added completion to secrets:remove.

This feature needs to be implemented on Symfony commands that has predictable values for their arguments and options.

Some guidelines:

• Don't complete file/directory paths for now. See [DX] Add completion to Symfony commands #43594 (comment)
• You don't need to filter the suggestions in PHP, compgen (used by the shell script) does this for you based on the suggestions provided by PHP
• You can use the debugging utility while working on providing suggestions. See [DX] Add completion to Symfony commands #43594 (comment)

PLEASE, comment here BEFORE starting to work on something and WAIT for the confirmation to avoid duplicate work.

All commands have been claimed

• Command debug:event-dispatcher (event, --dispatcher, --format) @stephenkhoo [Console] Add auto-completion to debug:event-dispatcher #43859
• Command debug:config (name, path) @eclairia Add completion for DebugConfig name and path arguments #43850
• Command debug:autowiring (search) @eclairia feat: add completion for DebugAutowiring search argument #43838
• Command messenger:failed:remove (id, --transport) @scyzoryck [Messenger] Add command completion for failed messages #43663
• Command messenger:failed:retry (id, --transport) @scyzoryck [Messenger] Add command completion for failed messages #43663
• Command messenger:failed:show (id, --transport) @scyzoryck [Messenger] Add command completion for failed messages #43663
• Command debug:container (name) @GromNaN [Framework] Add completion to debug:container #43857
• Command messenger:consume (receivers, --bus, --queues) @GromNaN [Messenger] Add completion to command messenger:consume #43891
• Command debug:firewall (name, --format) @IonBazan [Console] add suggestions for debug commands: firewall, form, messenger, router #43598
• Command debug:form (name, --format) @IonBazan [Console] add suggestions for debug commands: firewall, form, messenger, router #43598
• Command debug:messenger (bus) @IonBazan [Console] add suggestions for debug commands: firewall, form, messenger, router #43598
• Command debug:router (name) @IonBazan [Console] add suggestions for debug commands: firewall, form, messenger, router #43598
• Command cache:pool:clear (pools) @andyexeter Add completion for cache:pool:clear and cache:pool:delete commands #43621
• Command cache:pool:delete (pool, key) @andyexeter Add completion for cache:pool:clear and cache:pool:delete commands #43621
• Command completion (shell) @dkarlovi [Console] feat: add completion for CompletionCommand "shell" argument #43615
• Command config:dump-reference (name, path) @StaffNowa [FrameworkBundle] Add completion for config:dump-reference #43682
• Command help (command_name, --format) @GromNaN [Console] Add completion to help & list commands #43596
• Command debug:translation (locale, bundle, --domain) @alexandre-daubois [FrameworkBundle] Add completion to debug:translation command #43644
• Command debug:twig (name, --filter, --format) @StaffNowa Add completion for debug:twig #43846
• Command list (namespace, --format) @GromNaN [Console] Add completion to help & list commands #43596
• Command lint:twig (filename, --format) @makraz Add suggestions for the option 'format' of lints commands: twig, yaml and xliff #43680
• Command lint:xliff (filename, --format) @makraz Add suggestions for the option 'format' of lints commands: twig, yaml and xliff #43680
• Command lint:yaml (filename, --format, --exclude) @makraz Add suggestions for the option 'format' of lints commands: twig, yaml and xliff #43680
• Command messenger:setup-transports (transport) @Tayfun74 [Console] Add completion to messenger:setup-transports command #43640
• Command secrets:remove (name) @GromNaN [Console] [Framework] Add completion to secrets:set and fix secrets:remove #43626
• Command secrets:set (name, file) @GromNaN [Console] [Framework] Add completion to secrets:set and fix secrets:remove #43626
• Command security:encode-password (user-class) @94noni [PasswordHasher] Add autocompletion for security commands #43653
• Command security:hash-password (user-class) @94noni [PasswordHasher] Add autocompletion for security commands #43653
• Command server:dump (--format) @alexandre-daubois [VarDumper] Add completion to server:dump command #43683
• Command translation:pull (provider, --domains, --locales, --format) @welcoMattic [Translation] Add completion feature on translation pull and push commands #43672
• Command translation:push (provider, --domains, --locales) @welcoMattic [Translation] Add completion feature on translation pull and push commands #43672
• Command translation:update (locale, bundle, --format, --domain, --sort) @stephenkhoo [FrameworkBundle] Add completion feature on translation:update command #43676
• Command ulid:generate (--format) @StaffNowa [Uid] Allow use autocompletion #43639
• Command uuid:generate (--format) @StaffNowa [Uid] Allow use autocompletion #43639
• Command workflow:dump (name, marking, --label, --format) @StaffNowa StaffNowa [FrameworkBundle] Add completion for workflow:dump #43848

Commands that does not require auto-completion:

• Command about
• Command assets:install (target) (directory completion)
• Command cache:clear
• Command cache:pool:list
• Command cache:pool:prune
• Command cache:warmup
• Command debug:dotenv
• Command dotenv:dump
• Command debug:validator (class) @Kocal completion support not yet possible
• Command lint:container
• Command messenger:stop-workers
• Command router:match (path_info)
• Command secrets:decrypt-to-local
• Command secrets:encrypt-from-local
• Command secrets:generate-keys
• Command secrets:list
• Command server:log (--host, --format) @StaffNowa [MonologBridge] Add completion for server:log #43892
• Command ulid:inspect
• Command uuid:inspect