feat(spec): add value-conditional requirements - #1001
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Included review availability: Your plan includes up to 4 reviews per rolling hour; 1 remains after this review. 📝 WalkthroughWalkthroughThe change adds ChangesConditional flag requirements
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to For boolean flags supplied through the environment, truthy values may fail to activate a matching Sequence Diagram(s)sequenceDiagram
participant Input
participant explicit_flag_has_value
participant requires_if_validation
Input->>explicit_flag_has_value: provide command-line or environment value
explicit_flag_has_value->>requires_if_validation: report matching explicit value
requires_if_validation->>Input: require configured flag when absent
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Inline comments:
In `@lib/src/parse.rs`:
- Around line 1654-1658: Update the value comparison in the requires_if
validation path to normalize boolean environment values using the parser’s
existing truthy rule before comparing with expected, so values such as “1” and
“TRUE” match “true”; preserve delimiter handling and add regression coverage for
these boolean forms.
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docs/spec/reference/flag.mdlib/src/lib.rslib/src/parse.rslib/src/spec/builder.rslib/src/spec/flag.rs
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Greptile SummaryThe PR adds repeatable value-conditional flag requirements to the KDL model, builder API, serialization, documentation, and runtime parser.
Confidence Score: 4/5The precedence bug in conditional-requirement evaluation should be fixed before merging because a lower-precedence environment value can invalidate an otherwise valid command line. The new helper evaluates both the parsed command-line value and the environment value, allowing an overridden environment value to spuriously activate a requirement. Files Needing Attention: lib/src/parse.rs Important Files Changed
Reviews (1): Last reviewed commit: "feat(spec): add value-conditional requir..." | Re-trigger Greptile |
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| let Some(env) = flag.env.as_ref() else { | ||
| return false; | ||
| }; | ||
| let value = match custom_env { | ||
| Some(values) => values.get(env).cloned(), | ||
| None => std::env::var(env).ok(), | ||
| }; | ||
| value.is_some_and( | ||
| |value| match flag.arg.as_ref().and_then(|arg| arg.delimiter) { | ||
| Some(delimiter) => value.split(delimiter).any(|value| value == expected), | ||
| None => value == expected, | ||
| }, | ||
| ) |
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When a flag has a matching environment value but is passed on the command line with a different value, explicit_flag_has_value falls through to the lower-precedence environment value and activates the condition, causing an otherwise valid invocation to fail with a missing-flag error.
Knowledge Base Used: Spec Model and KDL Parsing
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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Cursor Bugbot has reviewed your changes and found 1 potential issue.
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Reviewed by Cursor Bugbot for commit f5dd6df. Configure here.
| pub value: String, | ||
| /// The flag selector that must then be satisfied. | ||
| pub requires: String, | ||
| } |
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Public struct lacks non_exhaustive
Low Severity
SpecRequiresIf is a new publicly exported spec type but omits #[non_exhaustive], unlike sibling types such as SpecFlag, SpecGroup, SpecChoices, and SpecMount. Shipping it exhaustive makes later field additions a breaking change for external struct literals and matches.
Reviewed by Cursor Bugbot for commit f5dd6df. Configure here.
1 participant
What changed
requires_if VALUE FLAGrelationships to the canonical KDL modelSpecFlagand its builderWhy
This is the remaining usage-derive v1 relationship that the spec could not express. The spec must define it before compiled tables and derives can lower into it without becoming lossy.
Validation
cargo test -p usage-lib --all-featurescargo test --all --all-featuresThis pull request was generated with Codex.
Note
Medium Risk
Changes CLI validation behavior for specs that adopt
requires_if; semantics are nuanced (defaults vs env vs CLI) but covered by new tests.Overview
Adds
requires_if VALUE FLAGto the KDL flag spec so a flag can require other flags only when it is explicitly set to a given value (repeatable for different value→flag pairs).Spec & API: New
SpecRequiresIftype andrequires_ifonSpecFlag, with KDL parse/emit round-trip andSpecFlagBuilder::requires_if/requires_ifs.SpecRequiresIfis re-exported from the public crate surface.Parser: After parse, when a declaring flag’s value matches (CLI or env, not defaults), the named flag must be satisfied or
MissingFlagis reported—aligned with clap’s explicit-vs-default distinction, including multi-value flags, delimiter-split env values, and boolean env normalization.Docs:
flag.mddocuments semantics and notes clap-generated specs still cannot carry these constraints.Reviewed by Cursor Bugbot for commit f5dd6df. Bugbot is set up for automated code reviews on this repo. Configure here.
Summary by CodeRabbit
New Features
Documentation