cdd1dbbb36
New test demonstrates how to use them. The user-defined extensions cannot be used in the same file where they were declared because the `initialize` commands are only executed when we import the modules containing them. TODO: user-defined attributes.
23 lines
755 B
Text
23 lines
755 B
Text
import Lean
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open Lean
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initialize fooExtension : SimplePersistentEnvExtension Name NameSet ←
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registerSimplePersistentEnvExtension {
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name := `fooExt
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addEntryFn := NameSet.insert
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addImportedFn := fun es => mkStateFromImportedEntries NameSet.insert {} es
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}
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syntax (name := insertFoo) "insert_foo " ident : command
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syntax (name := showFoo) "show_foo_set" : command
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open Lean.Elab
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open Lean.Elab.Command
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@[commandElab insertFoo] def elabInsertFoo : CommandElab := fun stx => do
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IO.println s!"inserting {stx[1].getId}"
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modifyEnv fun env => fooExtension.addEntry env stx[1].getId
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@[commandElab showFoo] def elabShowFoo : CommandElab := fun stx => do
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IO.println s!"foo set: {fooExtension.getState (← getEnv) |>.toList}"
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