feat: added support for --output json and --output yaml for cancel command for pipelinerun and taskrun

[anwesha-palit-redhat]

Changes

Added -o/--output flag to pipelinerun cancel and taskrun cancel.

• On success, when --output json or --output yaml is set, prints a structured result instead of the plain-text message.
• Default behavior (no --output flag) is unchanged — still prints PipelineRun cancelled:
• Invalid --output values (e.g. csv) return a clear error:

./tkn pipelinerun cancel sleep-pipeline-run-1789013716850-r-x6zw6 -n cancel-test -o csv
Error: invalid output format "csv": must be json or yaml

• Error paths (e.g. cancelling an already-finished run) still return plain error text regardless of --output, so failures are never mistaken for valid structured output:

./tkn pipelinerun cancel sleep-pipeline-run-1789013716850-r-54f56 -n cancel-test -o yaml
Error: failed to cancel PipelineRun sleep-pipeline-run-1789013716850-r-54f56: PipelineRun has already finished execution

• Successful structured output examples:

$ tkn pipelinerun cancel sleep-pipeline-run-tgckv-r-6qfrb -o json
{
    "cancelled": [
        {
            "kind": "PipelineRun",
            "name": "sleep-pipeline-run-tgckv-r-6qfrb",
            "namespace": "cancel-test",
            "requestedStatus": "Cancelled"
        }
    ]
}

$ tkn taskrun cancel my-taskrun -o yaml
cancelled:
- kind: TaskRun
  name: my-taskrun
  namespace: cancel-test
  requestedStatus: Cancelled

• Reuses the shared pkg/formatted.PrintStructuredOutput/IsStructured helpers; introduces a CancelResult{Kind, Name, Status} struct local to each command package.
• Updated --help examples for both commands to demonstrate -o json/-o yaml usage.

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you review them:

• Includes [tests](https://github.com/tektoncd/community/blob/master/standards.md#principles) (if functionality changed/added)
• Run the code checkers with make check
• Regenerate the manpages, docs and go formatting with make generated
• Commit messages follow [commit message best practices](https://github.com/tektoncd/community/blob/master/standards.md#commit-messages)

See [the contribution guide](https://github.com/tektoncd/cli/blob/master/CONTRIBUTING.md) for more details.

Release Notes

tkn pipelinerun cancel and tkn taskrun cancel now support --output json and --output yaml

Both commands accept a new -o/--output flag to print the cancellation result as structured JSON or YAML instead of plain text — useful for scripts, automation, and AI agents that need machine-readable output. Default (no --output flag) behavior is unchanged. An unsupported format (e.g. -o csv) returns a clear error.

[anwesha-palit-redhat]

/hold

Note: This PR depends on pkg/formatted/output.go and pkg/formatted/output_test.go, which are shared with the list PR. Please review and merge the list PR first, since it introduces these shared files; this PR only adds new usage on top of them for cancel. Once list lands, this PR can be rebased and the shared-file diff here should disappear.

[Copilot]

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

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[chmouel]

/lgtm

[Copilot]

🟡 Changes recommended

Generated command documentation is stale, and SetTypeMeta does not support pointer slices as its generic API implies.

Get a fresh assessment by requesting another Copilot review.

Review details

• Files reviewed: 6/6 changed files
• Comments generated: 3
• Review effort level: Balanced

[anwesha-palit-redhat]

/unhold

[pratap0007]

/approve

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pratap0007

The full list of commands accepted by this bot can be found here.

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Details

Needs approval from an approver in each of these files:

• OWNERS [pratap0007]

Approvers can indicate their approval by writing /approve in a comment
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[divyansh42]

/hold

We might need to re-think on the output format to meet the k8s standards. We can remove the hold once we conculde the discussion

[anwesha-palit-redhat]

@vdemeester the format is now updated for -o yaml and -o json for the format mentioned here

[vdemeester]

/lgtm

[Copilot]

Copilot review overview

🟡 Changes recommended

TaskRun structured output does not match the documented status contract, and the helper documentation contains stale API references.

Get a fresh assessment by requesting another Copilot review.

Review effort: Balanced
Findings: 1 · 3

Open (4)

• Use consistent Cancelled value in TaskRun status output · New
• Remove documentation references to nonexistent managed-fields helpers · New
• The new flag and examples are absent from the checked-in docs/cmd/tkn_taskrun_cancel.md and…
• The new flag and examples are absent from the checked-in docs/cmd/tkn_pipelinerun_cancel.md and…

Resolved since last review (1)

• SetTypeMeta silently does nothing for pointer slices. For example, with []*v1.Pipeline,…

[Copilot]

Copilot review overview

🔵 Needs a closer look

TaskRun reports an inaccurate requested status, and PipelineRun grace statuses lack structured-output test coverage.

Review effort: Balanced
Findings: None

Resolved since last review (4)

• Use consistent Cancelled value in TaskRun status output
• Remove documentation references to nonexistent managed-fields helpers
• The new flag and examples are absent from the checked-in docs/cmd/tkn_taskrun_cancel.md and…
• The new flag and examples are absent from the checked-in docs/cmd/tkn_pipelinerun_cancel.md and…

[divyansh42]

/retest

[divyansh42]

/hold cancel

[divyansh42]

/retest

[divyansh42]

/lgtm

Thanks @anwesha-palit-redhat

[divyansh42]

/lgtm