110ae4b571
This avoids the temporary files workaround on macOS and Windows, and makes sure we can process a `#eval` command and write messages to stdout at the same time.
24 lines
905 B
Text
24 lines
905 B
Text
/-
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Copyright (c) 2019 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Leonardo de Moura, Sebastian Ullrich
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-/
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import Lean.Environment
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namespace Lean
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universe u
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/-- `HasEval` extension that gives access to the current environment & options.
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The basic `HasEval` class is in the prelude and should not depend on these
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types. -/
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class MetaHasEval (α : Type u) :=
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(eval : Environment → Options → α → forall (hideUnit : optParam Bool true), IO Environment)
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instance metaHasEvalOfHasEval {α : Type u} [HasEval α] : MetaHasEval α :=
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⟨fun env opts a hideUnit => do HasEval.eval a hideUnit; pure env⟩
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def runMetaEval {α : Type u} [MetaHasEval α] (env : Environment) (opts : Options) (a : α) : IO (String × Except IO.Error Environment) :=
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IO.FS.withIsolatedStreams (MetaHasEval.eval env opts a false)
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end Lean
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