test(corpus): pin what completes where the cursor is - #998
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Completion was the one area with three implementations and no shared fixture. `argv/src/complete.rs` has its own unit tests, `cli/src/cli/complete_word.rs` has its own, and the Go implementation landed in #984 with a third set. Three sets of tests written against three readings of the same rules is the arrangement behind every drift this project has chased — the help renderers agreed on mise and differed on five of the other six jdx CLIs until #972 held them to one fixture. 17 vectors in `corpus/complete/`, plain JSON like the others so a Go, JS or Python implementation can run them without reimplementing a test format: positions (command, prefix, dash, hidden, aliases, globals in and out of scope) and values (a flag's choices, a positional's, and restart tokens). Restart tokens are why this file exists. mise declares `:::` on `run`, nothing covered it, and it is the one rule that makes the cursor's position depend on a word rather than a count — past the token the answer is the command's *first* argument again, whatever the words before it filled. Closes two thirds of PLAN.md's "not covered by the corpus yet". Mounts stay uncovered on purpose: resolving one *runs a command*, which a corpus cannot do hermetically, as the differential fuzzer found the expensive way. **Every expectation was measured before it was written.** Two of the first vectors asserted behaviour neither implementation has — a restart token offering itself, and `--format=j` completing its value. Both were plausible and both were mine rather than the grammar's. The corpus is the definition of correct, so one author's opinion is not enough to put a rule in it: the restart-token vector now pins what both implementations do (an argument with no choices defers to paths), and the attached-value case is left out rather than pinned, because a vector asserting "nothing happens" would block the fix. Both are noted where a reader will find them. Mutation-checked from both directions: unhiding a hidden subcommand in `argv/src/complete.rs` fails `hidden-is-never-offered`, and a vector claiming one word too many fails on its own id.
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Included review availability: Your plan includes up to 4 reviews per rolling hour; 2 remain after this review. 📝 WalkthroughWalkthroughAdds a public completion conformance module. It loads JSON vectors, executes local and reference completion against parsed specifications, compares candidates and file-completion status, and validates position, value, and restart-token cases. ChangesCompletion conformance
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to This change adds shared completion conformance coverage and localized test support without any actionable merge-blocking risk remaining beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant CompletionTest
participant CorpusLoader
participant CompletionRunner
participant UsageCli
CompletionTest->>CorpusLoader: load sorted JSON vectors
CompletionTest->>CompletionRunner: run vector against parsed specification
CompletionRunner-->>CompletionTest: return candidates and file status
CompletionTest->>UsageCli: run reference completion with Bash cursor data
UsageCli-->>CompletionTest: return reference candidates and file status
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Inline comments:
In `@conformance/src/complete.rs`:
- Around line 157-160: Update the corpus loading logic in load() to propagate
directory-entry read errors instead of discarding them with filter_map and
e.ok(). Preserve JSON-file filtering, but make any unreadable entry fail the
load so partial corpora cannot be returned.
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conformance/src/complete.rsconformance/src/lib.rsconformance/tests/complete.rscorpus/complete/01-positions.jsoncorpus/complete/02-values-and-restarts.jsoncorpus/complete/README.md
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Greptile SummaryThis PR adds a language-neutral completion corpus and a Rust conformance adapter for checking
Confidence Score: 4/5The PR appears safe to merge, with one non-blocking gap in automatically validating the corpus’s reference-agreement labels. The new vectors are exercised successfully against Files Needing Attention: conformance/tests/complete.rs, conformance/src/complete.rs Important Files Changed
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| // a `Command` with its own shell splitting, and re-deriving that inside a test would be a | ||
| // second implementation of the thing under test. `benches/gate` compares the two over mise's | ||
| // real spec, which is where the reference is actually held to account. |
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This test only requires a nonempty note for Reference::Diverges and never runs usage-cli, so false default Agrees labels and stale divergence labels pass while the corpus misrepresents implementation compatibility.
Knowledge Base Used:
Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!
Instruction counts
No instruction-count regression above 1%. Only instruction counts gate. Wall clock is shown for context — on identical hardware it moves 4-20% run to run. Measured by tak — instruction-counted CLI benchmarks, stored in this repository's git notes. Shadow comparisonParsing
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Completion was the one area with three implementations and no shared fixture.
argv/src/complete.rshas its own unit tests,cli/src/cli/complete_word.rshas its own, and the Go implementation landed in #984 with a third set. Three
sets of tests written against three readings of the same rules is the
arrangement behind every drift this project has chased — the help renderers
agreed on mise and differed on five of the other six jdx CLIs until #972 held
them to one fixture.
17 vectors in
corpus/complete/, plain JSON like the others so a Go, JS orPython implementation can run them without reimplementing a test format:
positions (command, prefix, dash, hidden, aliases, globals in and out of scope)
and values (a flag's choices, a positional's, and restart tokens).
Restart tokens are why this file exists. mise declares
:::onrun, nothingcovered it, and it is the one rule that makes the cursor's position depend on a
word rather than a count — past the token the answer is the command's first
argument again, whatever the words before it filled.
Closes two thirds of PLAN.md's "not covered by the corpus yet". Mounts stay
uncovered on purpose: resolving one runs a command, which a corpus cannot do
hermetically, as the differential fuzzer found the expensive way.
Every expectation was measured before it was written. Two of the first
vectors asserted behaviour neither implementation has — a restart token offering
itself, and
--format=jcompleting its value. Both were plausible and both weremine rather than the grammar's. The corpus is the definition of correct, so one
author's opinion is not enough to put a rule in it: the restart-token vector now
pins what both implementations do (an argument with no choices defers to paths),
and the attached-value case is left out rather than pinned, because a vector
asserting "nothing happens" would block the fix. Both are noted where a reader
will find them.
Mutation-checked from both directions: unhiding a hidden subcommand in
argv/src/complete.rsfailshidden-is-never-offered, and a vector claimingone word too many fails on its own id.
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Note
Low Risk
Mostly new test fixtures and conformance wiring; the CLI change is a thin metadata wrapper around existing completion behavior with no change to stdout output.
Overview
Introduces
corpus/complete/— JSON vectors that define what must complete at a given cursor for a KDL spec (positions, flags, choices, restart tokens, andfiles: truewhen the answer is path fallback).conformanceloads them, runsusage-argvcompletion, and checks metadata, unique ids, andreferencelabels againstusage-cli.usage-clicompletion now returnsCandidateAnswerviacomplete_answer: same printed candidates as before, plus afilesflag when choices came from filesystem scanning so the corpus can compare implementations without listing checkout-specific paths.Integration tests in
conformance/tests/complete.rsgateusage-argvagainst every vector and keep documented reference divergences honest.Reviewed by Cursor Bugbot for commit 01c90b9. Bugbot is set up for automated code reviews on this repo. Configure here.
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Summary by CodeRabbit
New Features
Documentation
Tests