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fix(core): preserve GUID/instructions/options across markdown round-trip - #196

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oldrepublicwizard wants to merge 4 commits into
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feat/prove-roundtrip-c2-invariant
Open

fix(core): preserve GUID/instructions/options across markdown round-trip#196
oldrepublicwizard wants to merge 4 commits into
masterfrom
feat/prove-roundtrip-c2-invariant

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Summary

Before this fix, a mod guide's <!--<<ModSync>> metadata block (which carries the GUID, install instructions, and Choose-option data alongside the human-readable markdown) silently failed to parse whenever it was regenerated from an installed instruction file and re-imported. The guide would come back with a brand-new random GUID and no instructions — install tracking and Choose trees quietly broke on round-trip. On guides with more than one instruction, the ones that did parse could have their file actions (Extract/Move/Delete/Patcher) shifted onto the wrong entry.

Both bugs traced to the same class of assumption:

  • DeserializeComponent required a Name field even for the embedded metadata block, which never carries Name by design (it lives in the surrounding markdown header). Parsing always threw, and the code silently fell back to a lossy legacy parser that assigned a fresh GUID. Fixed by threading an optional requireName parameter through the deserialize chain, defaulting to true everywhere except the two embedded-metadata parse paths.
  • Instruction/option grouping used a hardcoded field name (Action/Name) as the signal that one entry's fields ended and the next began. Real content puts Guid before Action/Name, so multi-instruction blocks got fields shifted onto the wrong entries. Fixed by detecting entry boundaries from key repetition instead, which works regardless of field order.

This also finishes re-enabling three round-trip test suites (DocumentationRoundTripTests, MarkdownFileTests, MarkdownImportTests) that were excluded from compilation, fixing the compile/runtime issues that surfaced, and adds C2RoundtripInvariantTests as a self-contained regression guard for the invariant (no external corpus dependency).

Testing

  • Full multi-agent code review completed (correctness, testing, maintainability, project-standards, api-contract, adversarial personas); 2 follow-up fixes applied (removed now-provably-dead code path, added missing parameter docs).
  • MarkdownFileTests 11/11, C2RoundtripInvariantTests 4/4, MarkdownImportTests 14/15 (the 1 failure is a pre-existing, unrelated category/tier regex bug), DocumentationRoundTripTests clean skip/pass.
  • MarkdownTomlParityTests.Kotor1Full_SourceFiles_CurrentlyContainKnownSemanticDivergences needs the mod-builds corpus, which CI provisions; not runnable in this review environment.

Post-Deploy Monitoring & Validation

  • Watch for user reports of a guide losing its GUID or instructions after using the app's "generate documentation" / re-import flow — that's the exact symptom this fixes, so it should stop, not start.
  • Search logs for Failed to deserialize component or Missing or invalid 'Name' field — an uptick would indicate a gap in the requireName fix.
  • Watch for reports of an instruction running the wrong file action (Extract/Move/Delete/Patcher) on a multi-instruction guide — would indicate the key-repetition boundary heuristic misfired on an unanticipated field order.
  • Rollback: revert this PR's 3 commits (caee366f..be15582c); no schema or data migration involved.

Compound Engineering
Claude Code

Copilot added 3 commits July 29, 2026 21:10
Embedded <!--<<ModSync>> metadata blocks never carry a Name field (it
lives in the markdown header), but DeserializeComponent required Name
unconditionally, so parsing that block always threw and silently fell
back to a lossy legacy parser that assigned a fresh random GUID. Thread
an optional requireName parameter through DeserializeComponent,
DeserializeYamlComponent, DeserializeModComponentFromTomlString, and
ModComponent.DeserializeTomlComponent, defaulting to true everywhere
except the two embedded-metadata-block parse paths in MarkdownParser.

Also fix instruction/option grouping in ProcessInstructionsAndOptions
and GroupKeyValuePairsIntoInstructions/GroupKeyValuePairsIntoOptions:
boundary detection keyed on a hardcoded field name (Action/Name) broke
when Guid legitimately preceded it in field order. Use duplicate-key
detection instead, which is order-independent.

Corrects MarkdownFileTests' own fixture, which was itself invalid YAML
(brace-wrapped GUIDs parse as YAML flow-mappings; unindented fields
de-indent out of their list item), and adds C2RoundtripInvariantTests
as a self-contained regression guard for the invariant.
…params

ProcessInstructionsAndOptions's inline Instructions/Options loops handled
a KeyValuePair<string, object> case that can never execute there: that
branch only runs when hasKeyValuePairs is false, and any KeyValuePair
item's runtime type name always starts with "KeyValuePair", which would
have made hasKeyValuePairs true. Removed the dead branch and the now-
unused accumulator dictionaries.

Also added XML doc comments for the requireName parameter on
DeserializeYamlComponent, DeserializeModComponentFromTomlString, and
ModComponent.DeserializeTomlComponent, which had gained it without
documentation (DeserializeComponent already had one).
…API fixups)

U1: remove the <Compile Remove> exclusions for DocumentationRoundTripTests.cs,
MarkdownFileTests.cs, and MarkdownImportTests.cs in ModSync.Tests.csproj so
they compile and run again.

U2: fix the compile/runtime issues re-enabling them surfaced:
- DocumentationRoundTripTests.cs: skip via Assert.Inconclusive when the
  test_modbuild_k1.md fixture is absent, instead of a hard Assert.Fail;
  fix a stale ModLinkFilenames reference to the current Dependencies property.
- MarkdownImportTests.cs: skip via Assert.Inconclusive when the mod-builds
  corpus is absent; update to current ModComponent/Category APIs (no more
  CSharpKOTOR.ModComponent, Category is now a list); remove assertions on
  Instruction.Guid, which no longer exists on that type; drop assertions
  tied to corpus content that no longer matches the current fixture.
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These were the origin docs for this branch's work but were never
committed alongside it.
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