Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
cd0be38bb4
This PR adds two new delaboration settings: `pp.deepTerms : Bool` (default: `true`) and `pp.deepTerms.threshold : Nat` (default: `20`). Setting `pp.deepTerms` to `false` will make the delaborator terminate early after `pp.deepTerms.threshold` layers of recursion and replace the omitted subterm with the symbol `⋯` if the subterm is deeper than `pp.deepTerms.threshold / 4` (i.e. it is not shallow). To display the omitted subterm in the InfoView, `⋯` can be clicked to open a popup with the delaborated subterm. <details> <summary>InfoView with pp.deepTerms set to false (click to show image)</summary>  </details> ### Implementation - The delaborator is adjusted to use the new configuration settings and terminate early if the threshold is exceeded and the corresponding term to omit is shallow. - To be able to distinguish `⋯` from regular terms, a new constructor `Lean.Elab.Info.ofOmissionInfo` is added to `Lean.Elab.Info` that takes a value of a new type `Lean.Elab.OmissionInfo`. - `ofOmissionInfo` is needed in `Lean.Widget.makePopup` for the `Lean.Widget.InteractiveDiagnostics.infoToInteractive` RPC procedure that is used to display popups when clicking on terms in the InfoView. It ensures that the expansion of an omitted subterm is delaborated using `explicit := false`, which is typically set to `true` in popups for regular terms. - Several `Info` widget utility functions are adjusted to support `ofOmissionInfo`. - The list delaborator is adjusted with special support for `⋯` so that long lists `[x₁, ..., xₖ, ..., xₙ]` are shortened to `[x₁, ..., xₖ, ⋯]`. |
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