contrib/completion/zsh doesn't complete compose

[halilim]

Description

docker compose <tab> does nothing with contrib/completion/zsh/_docker. docker completion zsh lists compose subcommands.

The original contrib script was deprecated and archived, but it appears to be manually maintained here. Should it still be considered so?

Original issue: https://github.com/Homebrew/homebrew-core/pull/231793 (Homebrew Docker depends on docker-completion > contrib.)

Related: https://github.com/docker/cli/issues/3955#issuecomment-2338035307

Reproduce

1. brew install docker
2. docker compose <tab>

Nothing happens

Expected behavior

List compose subcommands

docker version

Client: Docker Engine - Community
 Version:           28.3.3
 API version:       1.47 (downgraded from 1.51)
 Go version:        go1.24.5
 Git commit:        980b856816
 Built:             Wed Jul 16 10:32:48 2025
 OS/Arch:           darwin/arm64
 Context:           colima

Server: Docker Engine - Community
 Engine:
  Version:          27.4.0
  API version:      1.47 (minimum version 1.24)
  Go version:       go1.22.10
  Git commit:       92a8393
  Built:            Sat Dec  7 10:39:01 2024
  OS/Arch:          linux/arm64
  Experimental:     false
 containerd:
  Version:          1.7.24
  GitCommit:        88bf19b2105c8b17560993bee28a01ddc2f97182
 runc:
  Version:          1.2.2
  GitCommit:        v1.2.2-0-g7cb3632
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

docker info

Client: Docker Engine - Community
 Version:    28.3.3
 Context:    colima
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.26.1
    Path:     /opt/homebrew/lib/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  2.39.1
    Path:     /opt/homebrew/lib/docker/cli-plugins/docker-compose

Server:
 Containers: 3
  Running: 0
  Paused: 0
  Stopped: 3
 Images: 2
 Server Version: 27.4.0
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 Swarm: inactive
 Runtimes: runc io.containerd.runc.v2
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 88bf19b2105c8b17560993bee28a01ddc2f97182
 runc version: v1.2.2-0-g7cb3632
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.8.0-50-generic
 Operating System: Ubuntu 24.04.1 LTS
 OSType: linux
 Architecture: aarch64
 CPUs: 4
 Total Memory: 1.913GiB
 Name: colima
 ID: ad93ab15-62e4-4f8a-8593-f28415124024
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled

Additional Info

No response