Initial setup for code actions

This declares a code action provider that calls all @[hole_code_action] definitions on each occurrence of a hole (_, ?_ or sorry).

(This is in a separate file from Std.CodeAction.Hole.Attr so that the server does not attempt to use this code action provider when browsing the Std.CodeAction.Hole.Attr file itself.)

def Lean.CodeAction.holeCodeActionProvider : Server.CodeActionProvider

A code action which calls all @[hole_code_action] code actions on each hole (?_, _, or sorry).

inductive Lean.CodeAction.FindTacticResult : Type

The return value of findTactic?. This is the syntax for which code actions will be triggered.

• tactic : Syntax.Stack → FindTacticResult

  The nearest enclosing tactic is a tactic, with the given syntax stack.

• tacticSeq (preferred : Bool) (insertIdx : Nat) : Syntax.Stack → FindTacticResult

  The cursor is between tactics, and the nearest enclosing range is a tactic sequence. Code actions will insert tactics at index insertIdx into the syntax (which is a nullNode of tactic;* inside a tacticSeqBracketed or tacticSeq1Indented).

def Lean.CodeAction.findTactic? (preferred : String.Pos.Raw → Bool) (range : Syntax.Range) (root : Syntax) : Option FindTacticResult

Find the syntax on which to trigger tactic code actions. This is a pure syntax pass, without regard to elaboration information.

• preferred : String.Pos → Bool: used to select "preferred tacticSeqs" based on the cursor column, when the cursor selection would otherwise be ambiguous. For example, in:

  · foo
    · bar
      baz
    |
  

  where the cursor is at the |, we select the tacticSeq starting with foo, while if the cursor was indented to align with baz then we would select the bar; baz sequence instead.

• range: the cursor selection. We do not do much with range selections; if a range selection covers more than one tactic then we abort.

• root: the root syntax to process

The return value is either a selected tactic, or a selected point in a tactic sequence.

partial def Lean.CodeAction.findInfoTree? (kind : SyntaxNodeKind) (tgtRange : Syntax.Range) (ctx? : Option Elab.ContextInfo) (t : Elab.InfoTree) (f : Elab.ContextInfo → Elab.Info → Bool) (canonicalOnly : Bool := false) : Option (Elab.ContextInfo × Elab.InfoTree)

Returns the info tree corresponding to a syntax, using kind and range for identification. (This is not foolproof, but it is a fairly accurate proxy for Syntax equality and a lot cheaper than deep comparison.)

def Lean.CodeAction.cmdCodeActionProvider : Server.CodeActionProvider

A code action which calls all @[command_code_action] code actions on each command.