Add Label C1 Loadsheet decoder plugin

[thepacket]

Adds a decoder for label C1 electronic loadsheet uplinks.

npm run build passes.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 29feb6f6-735e-4b8d-a009-e07a9ba618c5

📥 Commits

Reviewing files that changed from the base of the PR and between 10f9f69 and 2935425.

📒 Files selected for processing (3)

• lib/MessageDecoder.ts
• lib/plugins/Label_C1_Loadsheet.ts
• lib/plugins/official.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[kevinelliott]

Summary

Adds Label_C1_Loadsheet for label C1 electronic loadsheet uplinks. Tolerant line-by-line parser with a single-line fallback that splits on known keywords. Registered last in MessageDecoder.ts/official.ts. No companion test file.

Verdict

Comment-only review — biggest single issue is the missing test coverage given how many fields this plugin tries to handle. The parsing logic is generally well-structured, but a few mismatches with the project's conventions and a couple of small bugs should be addressed.

Must Fix

• Add a Label_C1_Loadsheet.test.ts. This plugin recognizes ~13 distinct field types — please cover them. At minimum: qualifiers(), the multi-line happy path from the doc-comment example, the single-line fallback (splitIntoFields keyword path), PRELIMINARY vs FINAL variants, the SI route-vs-free-text branch, the NOTOC: NO normalization, and a non-matching message.
• Use ResultFormatter for shared concerns. Today the plugin sets raw.tail and pushes a custom code: 'TAIL' item with label 'Aircraft Registration', instead of calling ResultFormatter.tail(decodeResult, m[1]). Same for the route SI branch — ResultFormatter.departureAirport/arrivalAirport already exist and produce the canonical IATA/ICAO items. Direct raw.departure_iata = ... followed by a custom code: 'ROUTE' item bypasses the canonical "Origin/Destination" rows that consumers (and the test fixtures) expect.

Should Fix

• Add a preambles qualifier if at all possible. Every C1 observation in your doc-comment begins with . (the FRAGDLH-style sender token). If that's reliable, preambles: ['.'] would prevent this plugin from running its full keyword scan against unrelated C1 traffic.
• DDHHMM has no bounds validation. 190925 is fine, but 999999 is happily decoded as "Day 99 @ 99:99Z". Either validate dd <= 31, hh < 24, mm < 60, or document the looseness. Same applies to the loadsheet reference_time capture (free-form pass-through is fine; just be aware).
• PAX regex captures wrong totals when classes are swapped. For input PAX C/Y 6/84 you bind classes = ['C','Y'] and counts = [6, 84] — perfect. For PAX Y/C 84/6 you'd produce {Y: 84, C: 6} which is correct, but the classLabel mapping has a duplicate entry: both C and J map to 'Business'. That's acceptable airline-data shorthand, but worth a comment explaining you're treating them as equivalent intentionally.
• splitIntoFields is destructive across the input. It collapses \s{2,} to a single space before line-splitting. That's deliberate, but if a free-text SI line contains intentional double spaces, they're lost. Move the whitespace collapse inside per-line handling rather than at the top.
• raw.day = Number(dd) clobbers the typed field. RawFields.day is number | string, so this is OK, but be aware the same raw.day slot is used by ResultFormatter.day() — if a future C1 message also arrives with a UTC timestamp elsewhere you may write twice. Consider raw.dtg_day to disambiguate.
• const [_, dd, hh, mm] = m; — under stricter eslint configs the unused leading _ triggers @typescript-eslint/no-unused-vars. The codebase tends to use m[1]/m[2]/m[3] indexed access (see Label_15.ts). Optional cleanup.

Nits

• The keyword-splitter list mixes 'AN ', 'PAX ', 'PAX/' etc. — some have trailing space, some have a slash. That's fine but awkward to maintain. Consider a [{name, regex}] table.
• Doc-comment is excellent, very useful for future maintainers.
• Saving decodeResult.raw.is_agm = true as a typed boolean is fine; just consistent with how other plugins represent markers (most use a formatted.items entry only, no raw field).
• partial decode level when remaining.length === 0 but a section was unrecognized — small thing, but setDecodeLevel(decodeResult, anyMatched, remaining.length ? 'partial' : 'full') returns decoded: false if anyMatched was false. Confirm that's intended (it is, per the protocol).

Tests

None added. Please add Label_C1_Loadsheet.test.ts. See "Must Fix" above for coverage list.

Notes — Registration & Coexistence

• Registered at the tail of pluginClasses and exported from official.ts. No other plugin claims label C1, so order is irrelevant.
• No coexistence concerns.

Thanks @thepacket!