feat(BUZZ-231): add filters search command with highlighted results

[coxy]

Summary

Adds prolific filters search <query> for the new filter search API and restructures prolific filters into a parent command with list and search subcommands.

Warning

Breaking change: prolific filters and prolific filters -n no longer list filters directly. Use prolific filters list (and prolific filters list -n) instead. Noted under ## next in CHANGELOG.md.

filters search

• Searches titles, questions, descriptions, help text, categories, filter IDs and choice labels via GET /api/v1/filters/search/ (spec in prolific-oss/prolific#16270; endpoint is live, docs unreleased).
• Matched spans are highlighted in place using the API's code-point offsets, so accented characters line up. Overlapping and out-of-range spans are merged and clamped.
• Up to three matching choices are previewed per filter, with nested-descendant counts and an "…and N more" line when truncated.
• A header on the first screen shows the query and result count, with a hint to use --limit or --all when more exist. Results are numbered by rank, carry type and category as a dim subtitle, and are separated by a rule.
• --limit (default 25) is the number of results wanted and --all fetches every match. Pages of up to 100 are requested automatically through a new generic client.FetchPages helper. --offset is intentionally absent.
• In a terminal, output is piped through PROLIFIC_PAGER, then PAGER, defaulting to less -FRX, so the top result stays in view and the rest is scrollable. --no-pager prints directly. Piped or --json output never pages.
• --json emits the raw results for scripting and AI agents.

Deferred

• The contract_test entry and README coverage row for filters_SearchFilters can't be added until the API docs publish, because the coverage test rejects operations missing from the live spec. The daily schema-drift check will flag it then.
• The choices and choice-search endpoints are not implemented yet.
• Only filters search adopts FetchPages and the pager; migrating other commands is a follow-up.

Test plan

• make build, go vet ./..., make test pass (including contract_test)
• New tests: parent command wiring, search happy path, JSON, empty results, API error on first and later pages, flag validation, multi-page --limit and --all call sequences, --no-pager
• HighlightText table tests including code-point offsets on multi-byte text, merging and clamping
• Forced-colour tests prove highlights and bold heading segments are emitted
• FetchPages and pager resolution unit tests
• Rendering smoke-tested against a local stub serving the spec's example payload
• Manual check in a real terminal that less opens for long output and q returns cleanly (no PTY available in the authoring environment)
• Manual check against the live API once a token is available

Note: make lint fails locally on this machine with a golangci-lint / Go 1.27 export-data mismatch that also reproduces on a clean main; relying on CI lint here.

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[Copilot]

Copilot review overview

🟡 Changes recommended

Moderate issues remain in API coverage, output formats, help-text handling, and pager error handling.

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Review effort: Lite
Findings: 3 · 1

Open (4)

• Add HTTP request tests for endpoint and query parameters · New
• Include HelpText in search result output · New
• Treat benign pager EPIPE as successful exit · New
• Pass the error value directly to fmt.Errorf · New

What changed in this PR

Adds prolific filters search <query> with pagination, highlighted results, JSON output, and pager support while restructuring filters into parent, list, and search commands.

Changes:

• Added search models, client method, pagination helper, mocks, and tests.
• Added highlighted rendering, choice previews, JSON output, and pager handling.
• Updated command wiring, documentation, changelog, and breaking-change guidance.

Review findings:

• Moderate (2 votes): Add HTTP-level coverage for search endpoint paths and query parameters.
• Moderate (1 vote): Add standard output formats to filters list.
• Nit (2 votes): Pass the error directly to fmt.Errorf.
• Moderate (1 vote): Handle and render documented help_text matches.
• Moderate (2 votes): Add HelpText to the search result model.
• Moderate (3 votes): Treat benign pager EPIPE errors as successful exits.

File	Change
ui/​pager.go	Pager resolution and execution
ui/​pager_test.go	Pager behavior tests
README.md	Updated command listing
model/​filter_search.go	Search response models
mock_client/​mock_client.go	Generated API mocks
go.mod	Added dependencies
cmd/​root.go	Registered filters parent command
cmd/​filters/​search.go	Search command implementation
cmd/​filters/​search_view.go	Search result rendering
cmd/​filters/​search_view_test.go	Rendering and highlighting tests
cmd/​filters/​search_test.go	Command and pagination tests
cmd/​filters/​list.go	Converted list command to subcommand
cmd/​filters/​list_test.go	Updated list tests
cmd/​filters/​filters.go	Parent command wiring
cmd/​filters/​filters_test.go	Parent wiring tests
client/​responses.go	Search response type
client/​pagination.go	Generic page fetching
client/​pagination_test.go	Pagination tests
client/​client.go	Search API method
CHANGELOG.md	Feature and breaking-change notes

Files not reviewed (1)

• mock_client/mock_client.go: Generated file

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[coxy]

Done in d6bae3f: added TestSearchFiltersSendsExpectedRequest and TestSearchFiltersOmitsWorkspaceIDWhenEmpty in client/client_test.go, following the participant-groups httptest pattern. They assert method, path and the q, workspace_id, limit and offset parameters.

[coxy]

Not changed, deliberately. The spec for FilterSearchResult in prolific-oss/prolific#16270 has no help-text property; researcher_help_text appears only as a value in match.fields and as a highlight field. The API searches help text but does not return it, so there is nothing to decode or render. Showing it under "Matched on" is the most we can do without a second request. If the API later adds the property to the result it is a one-line model change.

[coxy]

Done in d6bae3f. RunPager now treats EPIPE, io.ErrClosedPipe and os.ErrClosed from the renderer as a normal exit while still surfacing real render errors and a non-zero pager exit. Covered by TestRunPagerTreatsEarlyQuitAsSuccess, which pipes a large render through head -n 1.

[coxy]

Done in d6bae3f.

[matt-kinton]

Nice one, this is a genuinely useful command and the test coverage is good. The highlight clamp/merge logic is careful, and good call flagging the breaking change in the changelog.

Got a fair list though, and most of it's structural rather than nitpicks. I think the pager side needs another pass before this goes in.

Blocking, I reckon

1. Quitting the pager fails the command. If you q out of less before it's read everything, the write to the pipe returns EPIPE, Page returns it as renderErr, and you get Error: error: write |1: broken pipe with a non-zero exit. I checked this outside the CLI to be sure, cmd.Wait() comes back nil so it's purely the render error. Git swallows EPIPE here and I think we should too.

2. The streaming pager doesn't actually stream. The comment on ui.Page says the first screen appears immediately, but renderSearch runs FetchPages to completion first, so with --all you wait for every page before a single byte comes out. Two options imo: either turn FetchPages into a yielding version (EachPage(want, pageSize, fetch, yield)) so pages go into the pager as they arrive, or drop the claim from the comment. I'd prefer the first, it makes --all usable and keeps memory bounded, and you've got total from page 1 for the header.

3. Rendering's in the wrong package. search_view.go is 236 lines of pure presentation sitting in cmd/. AGENTS.md says that lives in ui/{resource}/, and ui/feedback/ is already doing it. I know cmd/filters/view.go already drifted, but I'd rather not make it worse. HighlightSpan/HighlightText especially, they're generic text utils and ui.RenderHighlightedText is already sat right there in ui. Nothing outside the package uses any of it (search_view_test.go is in-package) so the rest can be unexported once it moves.

4. A few canonical helpers got duplicated:

   • pluralise overlaps ui.RenderRecordCounter, which six commands already use. If the wording genuinely needs to differ that's fine, but let's fix the shared one rather than grow a second (it's got a bug anyway, count > 1 means 0 renders as "record").
   • records == nil -> []{} is patching a gap in ui.JSONRenderer locally. A nil slice encodes as null, and study/submission/survey/collection list all have the same hole. Worth fixing it once in the renderer and deleting the branch here.
   • --json is hand-rolled, shared.AddOutputFlags/shared.ResolveFormat exist. Even if csv/table don't suit a block layout, -j should come through the shared path.
   • dimStyle is a new lipgloss style in cmd/, but ui owns DarkGrey already, feels like it wants a ui.RenderDimmed.

Other stuff worth doing in the same pass

• ui/pager.go has a few warts. exec.CommandContext(context.Background(), ...) doesn't do anything, and I saw the commit message saying it was to quiet noctx. Could we plumb cmd.Context() from cobra instead so ctrl-c actually kills the pager? Then the context earns its place. If cmd.Start() fails we fall back to render(w) but never close stdin, so that leaks. And pagerEnv is parameterised for testability but nothing tests it, os.LookupEnv("LESS") would do the same in a line.
• LESS=FRX gets injected even when the pager is bat or more, and defaultPager = "less -FRX" sets the same flags a second way. Two mechanisms doing one job, I'd pick one.
• Cobra can delete both validation branches for us: cmd.MarkFlagsMutuallyExclusive("all", "limit") kills the --all/--limit check, and Args: cobra.MinimumNArgs(1) kills the empty-query one. Still need the blank-string check, but the errors would then come out with usage like everything else in the CLI.
• The highlight path is three layers deep for one operation: highlightField -> HighlightText -> highlightWith(..., identity), and HighlightText is just an identity wrapper. spansForField also rescans the whole highlights slice once per field, so six passes per result. Could we build a map[string][]HighlightSpan once per result and hang two methods off it? That'd delete spansForField, highlightField and HighlightText, and the title would stop being a special path.
• searchPageSize = 100 is an API property living in the cmd layer, probably belongs next to client.DefaultRecordLimit.
• SearchOptions.Args is assigned but never read.
• fmt.Errorf("error: %s", err.Error()), AGENTS.md asks for err rather than err.Error().
• FetchPages doesn't trim to want, so if the API ever ignores limit we'd print more rows than asked for.
• total = page.Total takes the last page's count, so a final page missing meta would reset a known 300 down to len(items) and quietly drop the "use --limit or --all" hint. if page.Total > total would cover it.
• The --all loop has no cap, so full pages plus a missing count would spin forever. Cheap guard.
• TestSearchFiltersNoPagerWritesDirectly doesn't really test anything, there's no TTY in tests so both paths are already identical.

Happy to pair on the pager bits if it's easier, that one's fiddlier than it looks.

[matt-kinton]

One more pass, this time just repo conventions rather than the code itself. Sorry for the second helping haha.

The contract test one is the bit I'd actually act on

contract_test/contract_test.go has that operations table where every client method turns up either as a real call: or an explicit skip: with a reason. SearchFilters isn't in it. I went and checked the published spec:

$ curl -s https://docs.prolific.com/openapi.yaml | grep '^  /api/v1/filters'
  /api/v1/filters/:

So /api/v1/filters/search/ isn't in openapi.yaml at all. Two things follow from that which I think are worth knowing:

• SearchFilters gets none of the method/path/query-param verification that every other client method gets for free, so q, limit, offset and workspace_id are all unchecked.
• TestAPICoverage only passes right now because there's no operationId for it to miss. The day search gets published to the spec, that test goes red on whatever unrelated PR happens to run next, and someone else has to work out why.

Could we add a table entry with a skip reason so it's at least recorded? The doc comment at the top only defines OUTOFSCOPE and SPECMISMATCH, so it might want a third tag, something like NOTINSPEC.

Related: the API Coverage table in the README (Filters section, ~line 255) hasn't got the new endpoint. Same underlying problem though, it's keyed on operationId and there isn't one, so it probably wants a deliberate note rather than just being left off.

Rest of it

• AGENTS.md says list commands must support -n for scripting. filters list -n works but filters search -n errors, which feels a bit odd inside the same resource. shared.AddOutputFlags hands you -n as a hidden --table alias for free if we went that way.
• --limit doesn't mean the same thing here as it does elsewhere. Eleven other list commands use client.DefaultRecordLimit (200) for a single page, paired with --offset. Here it's 25 across auto-fetched pages with no offset. I actually prefer --all as a design, the bit that nags me is that cmd/feedback/list.go:105 already uses --limit 0 to mean "fetch everything", and here --limit 0 is a hard error. Same flag, same value, opposite meaning in one binary. Not asking you to fix the whole CLI, but maybe a line in the help text, or we pick a direction and I'll raise a ticket for the rest.
• --no-pager being a per-command flag will get copy-pasted onto every future command that paginates. Root already owns the persistent flags (--config, --skill), feels like it belongs up there.

None of these are as urgent as the pager stuff in my other comment, but I'd like the contract table one sorted before merge if you can.