f180eee7bf
This PR adjusts the "try this" widget to be rendered as a widget message under 'Messages', not a separate widget under a 'Suggestions' section. The main benefit of this is that the message of the widget is not duplicated between 'Messages' and 'Suggestions'. Since widget message suggestions were already implemented by @jrr6 for the new hint infrastructure, this PR replaces the old "try this" implementation with the new hint infrastructure. In doing so, the `style?` field of suggestions is deprecated, since the hint infrastructure highlights hints using diff colors, and `style?` also never saw much use downstream. Additionally, since the message and the suggestion are now the same component, the `messageData?` field of suggestions is deprecated as well. Notably, the "Try this:" message string now also contains a newline and indentation to separate the suggestion from the rest of the message more clearly and the `postInfo?` field of the suggestion is now part of the message. Finally, this PR changes the diff colors used by the hint infrastructure to be more color-blindness-friendly (insertions are now blue, not green, and text that remains unchanged is now using the editor foreground color instead of blue). ### Breaking changes Tests that use `#guard_msgs` to test the "Try this:" message may need to be adjusted for the new formatting of the message.
36 lines
963 B
Text
36 lines
963 B
Text
module
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public import Lean
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public meta import Lean.Elab.Tactic
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open Lean Meta Elab Tactic Try
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-- Install a `TryTactic` handler for `assumption`
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@[try_tactic assumption]
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def evalTryApply : TryTactic := fun tac => do
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-- We just use the default implementation, but return a different tactic.
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evalAssumption tac
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`(tactic| (trace "worked"; assumption))
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/--
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info: Try this:
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· trace "worked"; assumption
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-/
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#guard_msgs (info) in
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example (h : False) : False := by
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try? (max := 1) -- at most one solution
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-- `try?` uses `evalAndSuggest` the attribute `[try_tactic]` is used to extend `evalAndSuggest`.
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-- Let's define our own `try?` that uses `evalAndSuggest`
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elab stx:"my_try?" : tactic => do
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-- Things to try
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let toTry ← `(tactic| attempt_all | assumption | apply True | rfl)
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evalAndSuggest stx toTry
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/--
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info: Try these:
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• · trace "worked"; assumption
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• rfl
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-/
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#guard_msgs (info) in
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example (a : Nat) (h : a = a) : a = a := by
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my_try?
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