feat: loglayer.Multiline for multi-line messages#76

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feat/multiline-message

May 3, 2026

Commits on May 3, 2026

docs: add Multiline message design spec

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docs: revise Multiline spec after code review

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docs: extend Multiline spec with JoinPrefixAndMessages generalization

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docs: add Multiline implementation plan

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feat: add MultilineMessage skeleton (constructor + Lines)

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feat: implement MultilineMessage.String() (Stringer)

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feat: format non-string Multiline args via fmt.Sprintf("%v", v)

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feat: flatten nested *MultilineMessage at construction

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feat: split each Multiline arg on "\n" at construction

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feat: MultilineMessage.MarshalJSON serializes joined string

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test: pin that *MultilineMessage does not implement error

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docs: update Multiline GoDoc to match final constructor shape

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feat(transport): add AssembleMessage helper

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test(transport): adversarial smuggling cases for AssembleMessage

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feat(transport): JoinPrefixAndMessages handles *MultilineMessage

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fix(transport): JoinPrefixAndMessages folds prefix for non-string args

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feat(transports/cli): adopt AssembleMessage for multi-line support

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test(transports/cli): regression-guard, mixed, prefix, empty cases

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docs(transports/cli): refresh stale sanitizeMessages comment reference

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feat(transports/pretty): adopt AssembleMessage for multi-line support

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feat(transports/console): MessageField mode honors Multiline

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feat(transports/console): default (logfmt) mode honors Multiline

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chore(transports/console): use maps.Copy in MessageField branch

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test(transport/transporttest): Multiline + prefix contract scenarios

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docs: add ExampleMultiline to main module example_test.go

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docs(transports/cli): add Multiline Example for godoc

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docs: add logging-api/multiline.md page

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docs: surface Multiline in cheatsheet, sidebar, llms.txt, llms-full.txt

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docs(whats-new): add May 2 2026 entry for Multiline and prefix fix

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docs(plugins): note for plugin authors on preserving Multiline

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chore: add changeset for loglayer.Multiline

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fix(transport): guard JoinPrefixAndMessages against empty Multiline

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refactor: drop loglayer.NewMultilineMessage; use Multiline() in transport

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refactor(multiline): drop dead empty-string special case

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test+docs: pin Multiline edge cases and clarify nil handling

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docs: clarify Multiline scope; cross-link from cli/pretty/console pages

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docs: relocate Multiline plugin-interaction notes

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docs: add Log Sanitization reference page

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docs: move Security sidebar group to the bottom

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