[jdx]

Fixes #1604.

Tab completion for a CLI compiled from the derive never offered -h, --help, -V or --version, even though the parser accepts them and the help page lists them. usage --completions zsh had the same gap for usage itself.

$ usage -<Tab>
# before
--completions  --usage-spec
# after
-V  -h  --completions  --help  --usage-spec  --version

• usage-argv: completion now offers the parser's supplied help and version flags, using the same rule the help page uses. A spelling a declared flag already took (hidden ones included) is not offered, disable_help_flag/disable_version_flag are honored, and --version appears only where the parser accepts it.
• usage complete-word (the reference engine, used by usage generate completion scripts) now offers the same implicit flags when a spec does not declare them, so both engines agree. Specs that already declare -h/-V (as usage --usage-spec does) are unchanged.
• Mounts: merging a mounted spec no longer turns disable_help_flag, disable_help_subcommand or disable_version_flag back off on the command that set them. Previously mise run, which disables --help, regained it from the mounted root.

Completion output for existing CLIs gains -h/--help (and -V/--version on the root), so a few expectations in the completion tests and conformance corpus were updated to include them. cargo test --all --all-features passes.

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---

Note

Medium Risk
Broad completion behavior change across Rust, Go, and CLI reference engines; mount merge logic for help/version disable flags could affect mounted CLIs if mis-merged.

Overview
Tab completion now suggests -h / --help (and -V / --version where the parser accepts them), matching what the parser and help page already expose—previously only declared flags appeared.

The Rust argv engine reworks flag_forms to merge declared flags with help::supplied_entries, skip spellings already claimed (including hidden declarations), honor disable_* flags, treat default-subcommand flags separately from parser-owned supplied flags, and use an in_view path so --version can come from the root in views. complete-word adds add_supplied_flags with the same rules. Go argv adds suppliedCompletions for parity.

Mounted specs: merging a mount no longer clears disable_help_flag, disable_help_subcommand, or disable_version_flag on the host command (e.g. mise run no longer regains --help from the mounted root).

Tests and the completion conformance corpus were updated for the new candidates.

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Summary by CodeRabbit

• New Features
  • Command-line completions now suggest built-in --help and -h options, plus --version and -V where version support applies.
• Bug Fixes
  • Completions respect settings that disable help or version options, and declared flags take precedence over built-in options with the same spelling.
  • Mounted commands preserve help and version settings from the receiving command.
  • Completions keep applicable global flags available in subcommands while respecting command-specific flag scope.

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Reviewing files that changed from the base of the PR and between 3fcebdd and a2471ec.

Files selected for processing: 2

• argv/src/complete.rs
• cli/src/cli/complete_word.rs

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Reviewing files that changed from the base of the PR and between 215529d and 3fcebdd.

Files selected for processing: 2

• argv/src/complete.rs
• go/argv/complete.go

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Walkthrough

Completion now includes parser-supplied help and version flags when allowed by command settings and scope. Declared flags take precedence over matching supplied spellings. Mount merging preserves the receiving command’s help and version disable settings.

Changes: Flag completion

Layer / File(s)	Summary
Add supplied flag candidates argv/src/complete.rs, cli/src/cli/complete_word.rs, go/argv/complete.go	Completion implementations add applicable parser-supplied flags and omit spellings claimed by declared flags. Executable-view completion sources version entries from the root.
Preserve mount disable settings lib/src/spec/cmd.rs	Mount merging retains the receiving command’s help and version disable settings.
Validate supplied flag candidates argv/src/complete.rs, cli/tests/complete_word.rs, cli/tests/shell_completions_integration.rs, conformance/tests/completion.rs, corpus/complete/*	Tests and corpus expectations include supplied flags across prefixes, subcommands, mounted commands, delegated completion, and restart-token cases.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Low

Possibly related issues

• jdx/usage#1604: The issue reports missing help and version flags in generated completions. This change adds parser-supplied candidates in several completion paths, but does not establish coverage of every generated-script path.

Possibly related PRs

• jdx/usage#1581: Both changes affect flag availability in mounted-command completion.
• jdx/usage#1561: Both changes affect flag candidate generation, including handling of supplied spellings and aliases.

Suggested reviewers: greptile-apps

Merge Risk: Low · previous review 3fceb

Completion remains slightly misleading in narrow mounted and default-command configurations, but the issues do not block normal command execution and can be addressed with bounded follow-up.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 58.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: adding --help and --version candidates during flag completion.
Linked Issues check		Issue [#1604] requires generated completion for usage to offer -h, --help, -V, and --version. argv/src/complete.rs adds parser-supplied flags and removes declared duplicates. `cli/src/cli/…
Out of Scope Changes check		The changes remain within completion consistency for [#1604]. The Go completion implementation mirrors the supplied-flag behavior used by generated scripts. The mount merge fix preserves disabled help…

Full details: Linked Issues check

Explanation

Issue [#1604] requires generated completion for usage to offer -h, --help, -V, and --version. argv/src/complete.rs adds parser-supplied flags and removes declared duplicates. cli/src/cli/complete_word.rs adds the same implicit flags when the spec does not declare them. The code respects disabled flags and root-only version handling. Completion tests and corpus expectations cover the new candidates.

Full details: Out of Scope Changes check

Explanation

The changes remain within completion consistency for [#1604]. The Go completion implementation mirrors the supplied-flag behavior used by generated scripts. The mount merge fix preserves disabled help and version settings, which prevents completion from offering parser-rejected flags. Test and conformance updates validate these changes.

Full details: Docstring Coverage

Explanation

Docstring coverage is 58.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 12 functions across 7 files.

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

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[greptile-apps]

Confidence Score: 5/5

[Medium impact] The PR appears safe to merge; no blocking issues remain.

Summary

Completion now suggests unclaimed help and version flags across the Rust, reference, and Go engines.

• Flag completion offers accepted help and version spellings that are not claimed.
• Mounted specs keep the receiving command’s disabled help and version settings.

_{Reviews (5) · Last reviewed commit: "fix(complete): keep spellings a shared o..." · Reviewed by Greptile}

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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Follow-up Comments

Offer the documented -? help spelling.

483-485: 🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Offer the documented -? help spelling.

is_help_arg accepts -?, but add_supplied_flags supplies only --help and -h. Add the missing short candidate. complete_short_flag_names emits individual short flags, so this does not offer invalid bundles such as -a?. The existing spelling check preserves a declared -? flag.

Suggested fix

             supply("help", "Print help", Some("help"), None);
             supply("help", "Print help", None, Some('h'));
+            supply("help", "Print help", None, Some('?'));

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Review comment at @cli/src/cli/complete_word.rs around lines 483 - 485:
Update add_supplied_flags to supply the missing short help candidate for “-?”
alongside the existing “--help” and “-h” candidates. Preserve the existing
spelling check so a declared “-?” flag is not duplicated, and keep short-flag
completion limited to individual flags rather than bundles.

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[github-actions]

Instruction counts

benchmark	trend	instructions	Δ	wall (min)	Δ
markdown	▁▇▆▆▆▆▆▆▆▇▆▆▆▆██▇▆▇	266,891,603 → 266,899,197	+0.00%	47.01 → 46.93ms	-0.16%
startup	▆█▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▁▇	1,010,474 → 1,017,511	+0.70%	1.32 → 1.37ms	+3.26%

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 comparison

Parsing mise use -g node@20 against a shadow of mise's committed spec.
Reported, not gated: the shadow grows as the derive learns to express more, so
what to watch is the ratio rather than either column.

framework	stripped binary, bytes
usage	1250200
bpaf	2494640
clap	3100904

framework	instructions, cold parse	vs usage
usage	8295	—
clap	6313736	761x
bpaf	21909300	2641x

                                              min       p01       p10    median
usage-rs: argv -> struct                      751       754       759       774  ns
clap: build tree + parse -> struct        1246054   1251013   1259222   1274425  ns
bpaf: build parser + parse -> struct      3398628   3398628   3462761   3493290  ns

usage: argv -> struct                             774 ns      0.77 µs
clap: build tree + parse -> struct            1248693 ns   1248.69 µs
clap: parse -> struct, tree reused              50231 ns     50.23 µs
clap: build tree only                          745460 ns    745.46 µs

_{a2471ecc4d97 vs 9c846219a48e · measured on the runner, not pushed to the history.}