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feat(cli): rledger explain — describe validation error codes - #1675
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…-explain style rledger explain E2001 prints the code's title, severity, and a hand-written explanation (meaning, common cause, fix); bare rledger explain lists all 26 codes with severities; accepts E2001/e2001/2001; unknown codes exit non-zero with a pointer to the listing. The text lives on ErrorCode itself (title/explanation via exhaustive match, so adding a variant forces adding its explanation), plus ErrorCode::from_code. Deliberately NOT include_str! from spec/core/validation.md: published crates don't package spec/ and the Nix flake's source filter strips it (the v0.17.x channel lesson); the existing error_codes_documented_in_spec test still guards code<->spec drift. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Pull request overview
Adds a new rledger explain CLI subcommand that mirrors rustc --explain for rustledger’s validation error codes, with explanations stored as compile-time constants on rustledger_validate::ErrorCode to keep the binary self-contained and force completeness via exhaustive matches.
Changes:
- Adds
rledger explain [CODE]to print a code’s title/severity/explanation, andrledger explainto list all codes. - Extends
rustledger_validate::ErrorCodewithfrom_code(),title(), andexplanation()to back the CLI and guarantee per-variant documentation at compile time. - Adds focused unit tests for parsing, listing, unknown-code behavior, and explanation presence.
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| crates/rustledger/src/cmd/mod.rs | Registers the new explain command module. |
| crates/rustledger/src/cmd/explain.rs | Implements the rledger explain command and unit tests. |
| crates/rustledger/src/bin/rledger.rs | Wires the new Explain subcommand into the CLI dispatch. |
| crates/rustledger-validate/src/error.rs | Adds code→variant parsing plus per-code titles and long-form explanations. |
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✅ Compatibility Test Results
What's tested
Full results available in workflow artifacts |
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Implements improvement idea #6 —
rustc --explainfor rledger's E-codes.Design notes
ErrorCode(title()/explanation()via exhaustive match) — adding a variant forces adding its explanation at compile time. NewErrorCode::from_code.include_str!fromspec/core/validation.md: published crates don't packagespec/, and the Nix flake's crane source filter strips it (the v0.17.x channel-test lesson). The existingerror_codes_documented_in_spectest still guards code↔spec drift; explanations were sourced from the spec's per-code Condition/Severity sections.Verification
366 CLI + 94 validate tests pass (4 new: spelling roundtrip, full listing, unknown-code exit, every-code-has-substantive-explanation); smoke-tested
explain E2001/ bare /E9999; clippy-D warnings+ fmt clean.🤖 Generated with Claude Code