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doc: explain app_delab #6450

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Dec 29, 2024
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doc: explain app_delab #6450

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doc: explain `app_delab`
eric-wieser Dec 26, 2024
f5cd80a
Update src/Lean/PrettyPrinter/Delaborator/Basic.lean
eric-wieser Dec 28, 2024
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9 changes: 9 additions & 0 deletions src/Lean/PrettyPrinter/Delaborator/Basic.lean
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Expand Up @@ -123,6 +123,15 @@ unsafe def mkDelabAttribute : IO (KeyedDeclsAttribute Delab) :=
} `Lean.PrettyPrinter.Delaborator.delabAttribute
@[builtin_init mkDelabAttribute] opaque delabAttribute : KeyedDeclsAttribute Delab

/--
`@[app_delab c]` registers a delaborator for applications with head constant `c`.
Such delaborators also apply to the constant `c` itself (known as a "nullary application").

This attribute should be applied to definitions of type `Lean.PrettyPrinter.Delaborator.Delab`.

When defining delaborators for constant applications, one should prefer this attribute over `@[delab app.c]`,
as `@[app_delab c]` first performs name resolution on `c` in the current scope.
-/
macro "app_delab" id:ident : attr => do
match ← Macro.resolveGlobalName id.getId with
| [] => Macro.throwErrorAt id s!"unknown declaration '{id.getId}'"
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